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Letteratura scientifica selezionata sul tema "LEACHING CHARACTERISTICS"

Autore: Grafiati

Pubblicato: 11 settembre 2023

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Articoli di riviste sul tema "LEACHING CHARACTERISTICS"

Cheng, Jun Hua, Jian Zhang e Di Jiang Wen. "Comparison of Leaching Characteristics of Lead in Waste CRTs". Advanced Materials Research 177 (dicembre 2010): 470–74. http://dx.doi.org/10.4028/www.scientific.net/amr.177.470.

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This study investigates four extraction methods (water extraction, toxicity characteristics leaching procedure (TCLP), modified TCLP with pH control and sequential chemical extraction (SCE)), each representing different liquid-to-solid (L/S) ratios, pH controls, and types of leachant and their effects on the leaching concentration of Pb in cathode ray tubes (CRTs).The results indicated that for extraction with distilled water,the lead leaching concentration (mg/L) decreased with L/S ratio in the range of 2-100. The results also showed that the leaching concentration was strongly pH-dependent in the TCLP and modified TCLP tests. In modified TCLP tests,in the case of pHs lower than 6.3,the leaching concentrations of Pb decreased with an increase in pH. Due to the nature of amphoteric elements, in the case of pHs higher than 7, the Pb leaching concentration increased with increasing pH. In SCE tests, the Pb speciation approached the extractable carbonate bound fraction. Both amounts of Pb leached from the SCE and modified TCLP tests were much higher than those for the regular TCLP and water extraction tests. The initial particle size of samples have great effect on the leachability of Pb from waste CRTs.

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Ugurlu, Aysenur. "Leaching characteristics of fly ash". Environmental Geology 46, n. 6-7 (9 giugno 2004): 890–95. http://dx.doi.org/10.1007/s00254-004-1100-6.

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Fang, Hui, Xin Wu, Cai Liang e Yongshi Feng. "Study on leaching characteristics of MSWIFA in different pH environment". Advances in Engineering Technology Research 1, n. 2 (23 settembre 2022): 110. http://dx.doi.org/10.56028/aetr.1.2.110.

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The change of leaching solution of waste incineration fly ash (MSWIFA) after shaking under different initial extractant pH was studied, and the change trend was compared with that of fly ash under different extractant concentrations. In addition, the leaching characteristics of heavy metals were analyzed under the two methods. The results showed that the pH change of the initial extractant can not truly simulate the environment of fly ash landfill, and the former can not reflect the pH of the final leaching solution. Changing the initial extractant concentration within a certain range can gradually change the final leaching solution from alkaline to acidic, which can truly reflect the environmental changes experienced by fly ash in the landfill (such as rainstorm scouring, drought and other environment). The leaching concentration of heavy metals in the leaching solution obtained by shaking fly ash under different acetic acid concentrations reflects the actual leaching characteristics of heavy metals under different pH conditions, in which Pb and Zn are amphoteric leaching, and the other metals are cationic leaching.

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Fang, Hui, Xin Wu, Cai Liang e Yongshi Feng. "Study on leaching characteristics of MSWIFA in different pH environment". Advances in Engineering Technology Research 2, n. 1 (23 settembre 2022): 110. http://dx.doi.org/10.56028/aetr.2.1.110.

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Li, Xiang, Liang Zhang e Jia Zheng Li. "Leaching Characteristics of Cement-Fly Ash Pastes". Advanced Materials Research 557-559 (luglio 2012): 915–19. http://dx.doi.org/10.4028/www.scientific.net/amr.557-559.915.

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The leaching characteristics of cement-fly ash pastes were investigated by MIP, XRD and TG. The results show that the microstructure of hardened cement-fly ash paste deteriorates partly after leaching of soft water. At the leaching duration of 180 days, the hardened paste containing fly ash deteriorated a little more serious than the plain cement paste, but the incorporation of fly ash in a proper ratio was helpful to defer the trend of deterioration of the hardened paste microstructure. The microstructural stability of hardened cement-fly ash paste wasn’t damaged severely during the 180 days leaching duration.

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Cui, Yulong, Jiannan Chen, Yibo Zhang, Daoping Peng, Tao Huang e Chunwei Sun. "pH-Dependent Leaching Characteristics of Major and Toxic Elements from Red Mud". International Journal of Environmental Research and Public Health 16, n. 11 (10 giugno 2019): 2046. http://dx.doi.org/10.3390/ijerph16112046.

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This study analyzes the leaching behavior of elements from red mud (bauxite residue) at pH values ranging from 2 to 13. The leaching characteristics of metals and contaminated anions in five red mud samples produced by Bayer and combined processes were analyzed using the batch leaching technique following the US Environmental Protection Agency (USEPA) Method 1313. In addition, the geochemical model of MINTEQ 3.1 was used to identify the leaching mechanisms of metals. The results showed that Ca, Mg, and Ba follow the cationic leaching pattern. Al, As, and Cr show an amphoteric leaching pattern. The leaching of Cl− is unaffected by the pH. The maximum leaching concentration of the proprietary elements occurs under extremely acidic conditions (pH = 2), except for As. The leaching concentration of F− reaches 1.4–27.0 mg/L in natural pH conditions (i.e., no acid or base addition). At the same pH level, the leaching concentrations of Pb, As, Cr, and Cu are generally higher from red mud produced by the combined process than that those of red mud from the Bayer process. The leaching concentration of these elements is not strongly related to the total elemental concentration in the red mud. Geochemical modeling analysis indicates that the leaching of metal elements, including Al, Ca, Fe, Cr, Cu, Pb, Mg, Ba, and Mn, in red mud are controlled by solubility. The leaching of these elements depended on the dissolution/precipitation of their (hydr)oxides, carbonate, or sulfate solids.

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Lun, Dian, Taiping Yuan, Xiaolong Yang, Hongliu Rong, Junjie Shi e Minqiang Pan. "Effect of Fly Ash on Leaching Characteristics of Cement-Stabilized Macadam Base". Materials 14, n. 20 (9 ottobre 2021): 5935. http://dx.doi.org/10.3390/ma14205935.

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To study the leaching characteristics of a cement-stabilized macadam base with fly ash, a calcium leaching test, using varying cement and fly ash dosages in an ammonium chloride solution, was designed to obtain the rate of calcium ion leaching, porosity, and permeability coefficient of cement-stabilized macadam with leaching time. The results showed that the number of leached calcium ions increased with the cement dosage in the leaching of cement-stabilized macadam. With an increase in the cement dosage, the leaching rate of calcium ions decreased, and the leaching process of the material was delayed. The incorporation of fly ash could effectively slow down the degree of calcium ion leaching. The permeability coefficient increased gradually with the extension of leaching time, and the increase in fly ash content had a more significant effect on the improvement of the permeability coefficient than the increase in cement dosage did.

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Snow, V. O., e T. A. White. "Process-based modelling to understand which ryegrass characteristics can increase production and decrease leaching in grazed grass–legume pastures". Crop and Pasture Science 64, n. 3 (2013): 265. http://dx.doi.org/10.1071/cp13074.

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A significant challenge for the pastoral farming systems is to maintain or increase production while reducing leaching of nitrogen, and for pastoral systems, this means reducing leaching from urine patches. Here we explore the potential impact of four ryegrass characteristics to increase pasture production and reduce leaching from ryegrass–white clover pastures. We focus on understanding which characteristics are desirable, the stage before investigating the achievability of those characteristics in a breeding program. Those characteristics were: the winter- or summer-dominance of growth (GP); the ability of the plant to intercept radiation at low pasture mass (LI); rooting depth (RD); and resistance to moderate water stress (WF). The impact of these ryegrass characteristics, both singly and combined within a ryegrass–clover pasture, was explored across a range of soils, climates, irrigation management, and urine patch concentrations using the process-based model APSIM. Of the four characteristics tested, LI was the most effective in increasing production and reducing leaching in all environments. The characteristics RD and WF were moderately effective, with RD having a greater impact on reducing leaching whereas WF had a greater effect on increasing production. The characteristic with the least impact was GP and it seems that ryegrass is currently well adapted for typical temperatures in New Zealand. The production and environmental effects of the characteristics were additive. The characteristics should be investigated further in the typically more diverse mixtures normally found in pastures but show promise for achieving improved production while reducing leaching provided they can be achieved in a breeding program.

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Fibrianty, Fibrianty, Eko Hanudin e Azwar Ma’as. "Leaching Characteristics of Udipsamment Ameliored by Mineral Soil and Adhesive Polymer". JOURNAL OF TROPICAL SOILS 27, n. 1 (17 gennaio 2022): 17. http://dx.doi.org/10.5400/jts.2022.v27i1.17-25.

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Udipsamment is characterized by sand fraction > 95%, loose, and very high leaching. This study aimed to determine the effect of mineral soil ameliorants and adhesive polymers on the character of nutrient leaching in Udipsamment. The leaching study in lysimeters used a completely randomized design with three replications. The treatments consist of bagasse (B), mineral soil included Inceptisol (I) and Vertisol (V), and adhesive polymers included tapioca 1% and 2% (T1 and T2), tapioca dregs 1% and 2 % (A1 and A2), Polyvinylalcohol 0.1% and 0.2% (P1 and P2). Combination of treatments are IB, VB, IBT1, IBT2, VBT1, VBT2, IBA1, IBA2, VBA1 , VBA2 , IBP1, I BP2, VBP1, and VBP2. Observations were made before and after leaching. The research showed that VBT2 increases moisture-holding capacity. Amelioration improved the ability of Udipsamment to hold nutrients, after leaching for six months, there was a decrease in organic C, total N, and available P compared to before leaching. Amelioration increased the soil CEC, even up to the sixth month leaching, the soil CEC showed a higher value than before leaching. The amount of clay fraction was relatively uniform between the surface and the bottom of the lysimeter, indicating that the adhesive polymer successfully bonding the clay-sand particles and prevented clay leaching.

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Ji, Shu Hua, e Jiang Yang Deng. "Numerical Simulation on Characteristics of Nitrate Nitrogen Leaching under Different Irrigation Levels". Applied Mechanics and Materials 662 (ottobre 2014): 153–59. http://dx.doi.org/10.4028/www.scientific.net/amm.662.153.

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The characteristics of nitrate nitrogen leaching in soil under different irrigation levels were studied by soil column simulation experiment with numerical simulation done using LEACHM model taking nitrate nitrogen leaching under different irrigation levels as the research background. In sandy soils, an irrigation amount of 300 mm would cause nitrate nitrogen to leach downward 75~150 cm, with a leaching amount of 10~30.7 kg/ha; and an irrigation amount of 700 mm would make nitrate nitrogen leach downward about 3.5 m, with a leaching amount of 98 kg/ha. Research data showed that the amount of nitrate nitrogen leaching was positively correlated with the irrigation intensity level, irrigation level directly determined the amount of nitrate nitrogen leaching, and influenced its leaching depth.

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Tesi sul tema "LEACHING CHARACTERISTICS"

Bergsten, Joshua. "Sorption and leaching characteristics of heavy metals in artificial soil". Diss., Columbia, Mo. : University of Missouri-Columbia, 2006. http://hdl.handle.net/10355/4617.

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Thesis (M.S.) University of Missouri-Columbia, 2006.
The entire dissertation/thesis text is included in the research.pdf file; the official abstract appears in the short.pdf file (which also appears in the research.pdf); a non-technical general description, or public abstract, appears in the public.pdf file. Title from title screen of research.pdf file (viewed on August 21, 2007) Includes bibliographical references.

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Yang, Xinbo. "LEACHING CHARACTERISTICS OF RARE EARTH ELEMENTS FROM BITUMINOUS COAL-BASED SOURCES". UKnowledge, 2019. https://uknowledge.uky.edu/mng_etds/49.

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The demand for rare earth elements (REEs) has increased over the last decade due to applications in high technology devices including those in the defense industry. The recovery of REEs from primary sources such as rare earth minerals are viable using physical separations followed by chemical processing. However, weak market values and environmental concerns have limited the viability of such operations. On the other hand, REE recovery from secondary sources such as apatite ore, bauxite waste, and waste recycling, provides an opportunity to take advantage of a resource that does not require mining costs as well as other associated costs given that these expenses are covered by the revenue generated from the production of the primary material. Coal-based materials represent a potential source for REEs which may be extracted and concentrated by the use of physical and/or chemical processes. The current study focused on developing a leaching process to extract REEs from the pre-combustion coal sources including coarse and fine refuse and low-valued material obtained from coal preparation plants. Materials collected for leaching characteristic studies were found to have average total REE concentrations in the range of 200-350 ppm on a whole sample basis. Mineralogy studies performed on Fire Clay seam coal refuse using SEM-EDS detected micro-dispersed rare earth phosphate mineral particles which are generally difficult to dissolve in strong acid solutions. On the other hand, XRD analysis results from a high REE content segment of the West Kentucky No. 13 coal seam indicated the presence of fluorapatite which is soluble in weak acid solutions. The mineral associations of REEs were studied by extracting REEs using different types of acids under various pH conditions. Differential extraction of the REEs was examined along with the associated impurity elements such as iron, aluminum, and calcium among others. The findings showed that the light REEs were primarily associated in a phosphate mineral form, whereas the heavy REEs were mostly present in an ion substitution form associated with clay minerals. Relatively high concentrations of REEs were discovered in mixed-phase particles consisting of both coal and mineral matter. By reducing the particle size, more leachable forms of REEs were liberated and recovered along with the associated mineral matter embedded in the coal structure. The type of lixiviant played an important role during the initial stage of leaching but was found to be insignificant as the system reached equilibrium. Solids concentration in the leaching medium has an important role in establishing the throughput capacity of the leaching system. Test results found that an increase in solids concentration had a significant negative effect on rare earth recovery. This finding may be explained by higher concentrations of soluble calcium-based minerals such as calcite which provided localized pH increases near and within the pores of the solids. The result was precipitation of CaSO4 within the pores which blocked access for the lixiviants. This hypothesis was supported by the findings from BET and XPS analyses which found lower pore volume in high solid concentration systems and the existence of CaSO4 on the surface of the solids. Leaching test results obtained using sulfuric acid over a range of temperatures showed that the leaching process was mainly driven by a diffusion control process. The activation energy determined for an Illinois No. 6 coal source was 14.6 kJ/mol at the beginning of the reaction and 35.9 kJ/mol for the rest of the leaching process up to 2 hours. For material collected from the Fire Clay coal seam, the apparent activation energy was 36 kJ/mol at the start of the leaching reaction and decreased to 27 kJ/mol over the remaining period of the test. The activation energy values were nearly equivalent to the upper-level values that generally define a diffusion control process and the lower values of a chemical reaction control process. The lack of clarity in defining a clear control mechanism is likely associated with the variability in associated mineralogy, various modes of occurrence of the REEs and the interfacial transfer of product through the porous structure of the coal-based particles which requires relatively high activation energy. As such, both diffusion control and chemical reaction control mechanisms are likely occurring simultaneously during the leaching process with diffusion control being more dominant.

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Scherer, T., D. Slack, J. Watson e F. Fox. "Comparison of Three Irrigation Scheduling Methods and Evaluation of Irrigation Leaching Characteristics". College of Agriculture, University of Arizona (Tucson, AZ), 1989. http://hdl.handle.net/10150/204858.

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Three methods were used to schedule irrigations on replicated plots at the Maricopa Ag Center using DPL 90 cotton. The three methods were: a soil water balance model based on historic consumptive use curves, a soil water balance model based on the Modified Penman Equation and daily weather (AZMET), and infrared thermometry using the C.W.S.I. A potassium-bromide conservative tracer was applied at selected sites in the plots to evaluate leaching characteristics. The irrigation scheduling test was duplicated at the Safford Experiment Station and is presented in another report. Results from the 1988 data indicate that there was no significant difference in yield between the 3 methods. There was a significant difference in water applied; the historic consumptive-use curves was the lowest and the Penman equation method was the highest.

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Three methods were used to schedule irrigations during 1989 on replicated plots at the Maricopa Ag Center using DPL 90 cotton. This is a continuation of the research initiated in 1988 using the same field The three methods were; a soil water balance model based on historic consumptive use curves, a soil water balance model based on the Modified Penman Equation and daily weather (AZMET), and infrared thermometry using the C.W.S.I. A potassium- bromide conservative tracer was applied at selected sites in the plots to evaluate leaching characteristics. The irrigation scheduling test was again duplicated at the Safford Experiment Station and is presented in another report. Results from this years data indicate that there was no significant difference in yield among the three methods. However, as in 1988 there was a significant difference in water applied with historic consumptive use (ERIE) the lowest and the Penman equation method (CHECKBOOK) the highest.

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Scherer, Tom, Don Slack, Jack Watson e Fred Fox. "Comparison of Three Irrigation Scheduling Methods and Evaluation of Irrigation Leaching Characteristics". College of Agriculture, University of Arizona (Tucson, AZ), 1991. http://hdl.handle.net/10150/208344.

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Three methods were used to schedule irrigations during the 1990 growing season on replicated plots at the Maricopa Ag Center using DPL 90 cotton. This is the final report of the research initiated in 1988. The three methods were: a soil water balance model based on historic consumptive use curves (ERIE), a soil water balance model (AZSCHED) based on the Modified Penman Equation and daily weather (AZMET), and infrared thermometry using the Crop Water Stress Index (CWSI). A potassium- bromide conservative tracer was applied at selected sites in the plots to evaluate leaching characteristics. The irrigation scheduling test was again duplicated at the Safford Experiment Station and is presented in another report. Results from this years data indicate that there was no significant difference in yield between the 3 methods. Also, there was no significant difference in the amount of applied irrigation water. The AZSCHED and ERIE methods will be developed into Extension educational tools and released for use by growers.

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Purbashree, Sarmah. "Mechanical and leaching characterization of inert waste landfills for safe and sustainable management". Kyoto University, 2020. http://hdl.handle.net/2433/259083.

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Yusoff, Wan Abdullah bin Wan. "Effect of zeolites on soil characteristics, leaching and surface pollutant losses form soils of contrasting textures". Thesis, Lancaster University, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.531713.

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Hackett, A. J. "The influence of contaminated crushed brick aggregate on the strength, durability and leaching characteristics of concrete". Thesis, Queen's University Belfast, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.273043.

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Schmidt, Martin. "Assessment of the physical, chemical and leaching characteristics of a marine sediment dredge spoil at Bing Bong, Northern Territory /". Title page, contents and abstract only, 1997. http://web4.library.adelaide.edu.au/theses/09AR/09ars353.pdf.

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Plappally, Anand Krishnan. "Theoretical and Empirical Modeling of Flow, Strength, Leaching and Micro-Structural Characteristics of V Shaped Porous Ceramic Water Filters". The Ohio State University, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=osu1276860054.

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Più fonti

Libri sul tema "LEACHING CHARACTERISTICS"

Miller, Nadia C. Predicting flow characteristics of a lixiviant in a fractured crystalline rock mass. Washington, D.C: Bureau of Mines, United States Department of Interior, 1993.

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Hassett, David J. Leaching and attenuation characteristics of unaltered and thermally altered materials from the Rocky Mountain 1 underground coal gasification field site: Topical report. [Grand Forks, ND (P.O. Box 9018, Grand Forks, 58202-9018): Energy & Environmental Research Center, University of North Dakota, 1998.

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E, Horn M., Owens J. B, Holcombe L. J, Electric Power Research Institute, Radian Corporation e Environmental Management Services (Firm), a cura di. Creosote-treated wood poles and crossarms: Toxicity characteristic leaching procedure (TCLP) results. Palo Alto, Calif: Electric Power Research Institute, 1992.

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Vuorinen, Ilppo. Post-Glacial Baltic Sea Ecosystems. Oxford University Press, 2018. http://dx.doi.org/10.1093/acrefore/9780190228620.013.675.

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Post-glacial aquatic ecosystems in Eurasia and North America, such as the Baltic Sea, evolved in the freshwater, brackish, and marine environments that fringed the melting glaciers. Warming of the climate initiated sea level and land rise and subsequent changes in aquatic ecosystems. Seminal ideas on ancient developing ecosystems were based on findings in Swedish large lakes of species that had arrived there from adjacent glacial freshwater or marine environments and established populations which have survived up to the present day. An ecosystem of the first freshwater stage, the Baltic Ice Lake initially consisted of ice-associated biota. Subsequent aquatic environments, the Yoldia Sea, the Ancylus Lake, the Litorina Sea, and the Mya Sea, are all named after mollusc trace fossils. These often convey information on the geologic period in question and indicate some physical and chemical characteristics of their environment. The ecosystems of various Baltic Sea stages are regulated primarily by temperature and freshwater runoff (which affects directly and indirectly both salinity and nutrient concentrations). Key ecological environmental factors, such as temperature, salinity, and nutrient levels, not only change seasonally but are also subject to long-term changes (due to astronomical factors) and shorter disturbances, for example, a warm period that essentially formed the Yoldia Sea, and more recently the “Little Ice Age” (which terminated the Viking settlement in Iceland).There is no direct way to study the post-Holocene Baltic Sea stages, but findings in geological samples of ecological keystone species (which may form a physical environment for other species to dwell in and/or largely determine the function of an ecosystem) can indicate ancient large-scale ecosystem features and changes. Such changes have included, for example, development of an initially turbid glacial meltwater to clearer water with increasing primary production (enhanced also by warmer temperatures), eventually leading to self-shading and other consequences of anthropogenic eutrophication (nutrient-rich conditions). Furthermore, the development in the last century from oligotrophic (nutrient-poor) to eutrophic conditions also included shifts between the grazing chain (which include large predators, e.g., piscivorous fish, mammals, and birds at the top of the food chain) and the microbial loop (filtering top predators such as jellyfish). Another large-scale change has been a succession from low (freshwater glacier lake) biodiversity to increased (brackish and marine) biodiversity. The present-day Baltic Sea ecosystem is a direct descendant of the more marine Litorina Sea, which marks the beginning of the transition from a primeval ecosystem to one regulated by humans. The recent Baltic Sea is characterized by high concentrations of pollutants and nutrients, a shift from perennial to annual macrophytes (and more rapid nutrient cycling), and an increasing rate of invasion by non-native species. Thus, an increasing pace of anthropogenic ecological change has been a prominent trend in the Baltic Sea ecosystem since the Ancylus Lake.Future development is in the first place dependent on regional factors, such as salinity, which is regulated by sea and land level changes and the climate, and runoff, which controls both salinity and the leaching of nutrients to the sea. However, uncertainties abound, for example the future development of the Gulf Stream and its associated westerly winds, which support the sub-boreal ecosystems, both terrestrial and aquatic, in the Baltic Sea area. Thus, extensive sophisticated, cross-disciplinary modeling is needed to foresee whether the Baltic Sea will develop toward a freshwater or marine ecosystem, set in a sub-boreal, boreal, or arctic climate.

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Capitoli di libri sul tema "LEACHING CHARACTERISTICS"

Lee, Eun Song, Seung Ki Back, Jin Ho Sung, AHM Mojammal, Joo Chan Lee, Jung Hoon Kim e Yong Chil Seo. "Leaching Characteristics of Mercury Waste and Prediction of Long-Term Leaching Behaviour". In Waste Valorisation and Recycling, 143–46. Singapore: Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-13-2784-1_13.

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Li, Guanghui, Wen Cai, Mingjun Rao, Qian Zhi e Tao Jiang. "Sulfuric Acid Leaching Characteristics of Ni-Doped Goethite". In Ni-Co 2013, 117–24. Cham: Springer International Publishing, 2013. http://dx.doi.org/10.1007/978-3-319-48147-0_7.

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Li, Guanghui, Wen Cai, Mingjun Rao, Qian Zhi e Tao Jiang. "Sulfuric Acid Leaching Characteristics of Ni-Doped Goethite". In Ni-Co 2013, 117–24. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2013. http://dx.doi.org/10.1002/9781118658826.ch7.

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Wang, Ya-Jun, Jun-Guo Li, Ya-Nan Zeng e Xiao-Yu Li. "Sequential Leaching Characteristics of Chromium in AOD Slag-Based Cementitious Materials". In TMS 2019 148th Annual Meeting & Exhibition Supplemental Proceedings, 1217–25. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-05861-6_116.

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Chen, Mengjun, Fu-Shen Zhang e Jianxin Zhu. "Environmental Leaching Characteristics and Bioavailabilities of Waste Cathode Ray Tube Glass". In Recycling of Electronic Waste II, 103–8. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2011. http://dx.doi.org/10.1002/9781118086391.ch14.

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Dozol, M., P. Pottier, W. Krischer e R. Simon. "Integration of Waste Package Characteristics and Engineered Barrier Interactions into Characterization and Long-Term Behaviour Programmes". In Leaching of Low and Medium Level Waste Packages Under Disposal Conditions, 15–29. Dordrecht: Springer Netherlands, 1985. http://dx.doi.org/10.1007/978-94-009-4974-4_3.

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Yokobori, Nohara, Toshifumi Igarashi e Tetsuro Yoneda. "Leaching Characteristics of Heavy Metals from Mineralized Rocks Located Along Tunnel Construction Sites". In Engineering Geology for Society and Territory - Volume 6, 429–33. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-09060-3_74.

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Yang, Yong-bin, Xiao-liang Liu, Tao Jiang, Qian Li, Bin Xu e Yan Zhang. "Gold Leaching Characteristics and Intensification of a High S and As-Bearing Gold Concentrate". In Characterization of Minerals, Metals, and Materials 2015, 719–26. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2015. http://dx.doi.org/10.1002/9781119093404.ch91.

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Yang, Yong-bin, Xiao-liang Liu, Tao Jiang, Qian Li, Bin Xu e Yan Zhang. "Gold Leaching Characteristics and Intensification of a High S and As-Bearing Gold Concentrate". In Characterization of Minerals, Metals, and Materials 2015, 719–26. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-48191-3_91.

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Sakamoto, Kazuhiko, Yugo Isobe, Xuhui Dong e Shidong Gao. "Simulated Acid Rain Leaching Characteristics of Acid Soil Amended with Bio-Briquette Combustion Ash". In Acid rain 2000, 1451–56. Dordrecht: Springer Netherlands, 2001. http://dx.doi.org/10.1007/978-94-007-0810-5_89.

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Atti di convegni sul tema "LEACHING CHARACTERISTICS"

Guo, Bin, Zhe Zhu, Ailing Ren e Yuanming Guo. "Leaching characteristics of semidry flue gas desulfurization products". In 2009 International Conference on Energy and Environment Technology (ICEET 2009). IEEE, 2009. http://dx.doi.org/10.1109/iceet.2009.387.

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"Leaching Characteristics of Blended Mortars Containing Copper Slags". In "SP-221: Eighth CANMET/ACI International Conference on Fly Ash, Silica Fume, Slag, and Natural Pozzolans in Concrete". American Concrete Institute, 2004. http://dx.doi.org/10.14359/13299.

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Stuckman, Mengling, Christina Lopano, Christine Thomas e Alexandra Hakala. "Leaching Characteristics of Drill Cuttings From Unconventional Gas Reservoirs". In Unconventional Resources Technology Conference. Society of Petroleum Engineers, 2015. http://dx.doi.org/10.2118/178638-ms.

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Stuckman, Mengling Y., Christina Lopano, Christine Thomas e Jacqueline A. Hakala. "Leaching Characteristics of Drill Cuttings From Unconventional Gas Reservoirs". In Unconventional Resources Technology Conference. Tulsa, OK, USA: American Association of Petroleum Geologists, 2015. http://dx.doi.org/10.15530/urtec-2015-2154985.

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Du, Y., e M. Chrysochoou. "The Leaching Characteristics of Chromite Ore Processing Residue from China". In Geo-Chicago 2016. Reston, VA: American Society of Civil Engineers, 2016. http://dx.doi.org/10.1061/9780784480168.010.

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Ashfaq, Mohammed, M. Heeralal e Arif Ali Baig Moghal. "Effect of Coal Gangue Particle Size on Its Leaching Characteristics". In Geo-Congress 2020. Reston, VA: American Society of Civil Engineers, 2020. http://dx.doi.org/10.1061/9780784482827.012.

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Kim, In-Tae, Hwan-Seo Park, Yong-Zun Cho, Kwang-Wook Kim, Seong-Won Park e Eung-Ho Kim. "Characteristics of Solidified Products Containing Radioactive Molten Salt Waste". In The 11th International Conference on Environmental Remediation and Radioactive Waste Management. ASMEDC, 2007. http://dx.doi.org/10.1115/icem2007-7303.

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For a treatment of molten salt wastes generated from a pyroprocessing of oxide spent fuel, we had suggested a stable chemical route, named GRSS (Gel-Route Stabilization & Solidification), and a subsequent consolidation method. By using this method, a series of monolithic wasteforms with different conditions were fabricated, and then their physicochemical properties were investigated. A simulated salt containing 90wt% LiCl, 6.8wt% CsCl, and 3.2wt% SrCl2 was treated with a gel-forming material system, Si/Al/P = 0.4/0.4/0.2 and 0.35/0.35/0.3, and the gel-products were treated at 1100C° after mixing with borosilicate glass powder, where the salt loadings were about 16∼20wt%. The solidified products had a density of 2.3∼2.35g/cm3, a micro-hardness of 4.69∼4.72GPa, a glass transition temperature of 528∼537C°, and a thermal expansion coefficient of 1.65×10−7∼3.38×10−5/C°. Leaching results by the PCT-A method revealed leached rates, 10−3∼10−2g/m2day and 10−4∼10−3g/m2day for Cs and Sr, respectively. From the long-term ISO leaching test, the 900day-leached fraction of Cs and Sr predicted by a semi-empirical model were 0.89% and 0.39%. The leaching behaviors indicated that Cs would be immobilized into a Si-rich phase while Sr would be in a P-rich phase. The experimental results revealed that the GRSS method could be an alternative method for a solidification of radioactive molten salt wastes.

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Takaya, Yutaro, Koichiro Fujinaga, Tatsuo Nozaki e Yasuhiro Kato. "Chemical Leaching Characteristics of Umber Ore Samples Showing their Forming Processes". In Goldschmidt2020. Geochemical Society, 2020. http://dx.doi.org/10.46427/gold2020.2532.

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Hu, Lisong, Wenjing Pan, Zhichong Ni e Zhen Liang. "Study on leaching characteristics of Cr(VI) from chromite ore processing residue". In 2011 International Conference on Electrical and Control Engineering (ICECE). IEEE, 2011. http://dx.doi.org/10.1109/iceceng.2011.6058338.

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Eun, Jongwan, Jiannan Chen e James M. Tinjum. "Long-Term Leaching Characteristics of Chromite Ore Processing Residue Using Synthetic Groundwater". In Geo-Chicago 2016. Reston, VA: American Society of Civil Engineers, 2016. http://dx.doi.org/10.1061/9780784480151.041.

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Rapporti di organizzazioni sul tema "LEACHING CHARACTERISTICS"

Chipman, N. A. Leaching characteristics of Idaho Chemical Processing Plant calcines. Office of Scientific and Technical Information (OSTI), febbraio 1990. http://dx.doi.org/10.2172/7178969.

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Hill, K. A. Saltstone Third Quarter Calendar Year 2018 (3QCY18) Toxicity Characteristics Leaching Procedure (TCLP) Results. Office of Scientific and Technical Information (OSTI), aprile 2019. http://dx.doi.org/10.2172/1510925.

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Mensinger, M. C., e J. S. Budiman. Physical and thermal properties and leaching characteristics of a beneficiated eastern oil shale hydroretorted in the PFH process. Office of Scientific and Technical Information (OSTI), dicembre 1992. http://dx.doi.org/10.2172/10177130.

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Miyamoto, Seiichi, e Rami Keren. Improving Efficiency of Reclamation of Sodium-Affected Soils. United States Department of Agriculture, dicembre 2000. http://dx.doi.org/10.32747/2000.7570569.bard.

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Sodium affected soils, along with salt-affected soils, are distributed widely in irrigated areas of the arid and semi-arid region of the world. Some of these soils can and must be reclaimed to meet the increasing demand for food, and existing irrigated lands must be managed to reduce salinization and alkalization associated with deteriorating irrigation water quality. This project was conducted for examining ways to reduce the use of chemical amendments and large quantities of leaching water for reclaiming sodic soils or for preventing soil sodification, We hypothesized that sodicity of calcareous soils irrigated with moderately sodic irrigation water can be controlled by maximizing dissolution of soil CaCO3. The work performed in Israel has shown that dissolution of CaCO3 can be enhanced by elevating the CO2 partial pressure in soils, and by increasing pore water velocity. The concentration of Ca in pore water was at an order of 1.5 mmolc L-1 at a CO2 partial pressure of 5 kPa, which is sufficient to maintain SAR below 4 at salinity of irrigation water of 0.5 dS m-1 or less. Incorporation of crop residue at a flesh weight of 100 Mg ha-1 reduced the exchangeable Na percentage from 19 to 5%, while it remained 14% without crop residue application These findings indicate a possibility of preventing soil sodification with appropriate crop rotation and residue management without chemical amendments, provided that soils remain permeable. In the case of highly sodic soils, dissolution of CaCO3 alone is usually insufficient to maintain soil permeability during initial leaching. We examined the effect of salinity and sodicity on water infiltration, then developed a way to estimate the amendments required on the basis of water infiltration and drainage characteristics, rather than the traditional idea of reducing the exchangeable Na percentage to a pre-fixed value. Initial indications from soil column and lysimeter study are that the proposed method provides realistic estimates of amendment requirements. We further hypothesized that cultivation of salt-tolerant plants with water of elevated salinity can enhance reclamation of severely Na-affected soils primarily through improved water infiltration and increased dissolution of CaCO3 through respiration. An outdoor lysimeter experiment using two saline sodic Entisols sodded with saltgrass for two seasons did not necessarily support this hypothesis. While there was an evidence of increased removal of the exchangeable Na originally present in the soils, the final salinity and sodicity measured were lowest without sod, and highest when sodded. High transpiration rates, coupled with low permeability and/or inadequate leaching seemed to have offset the potential benefits of increased CaCO3 dissolution and subsequent removal of exchangeable Na. Although vegetative means of reclaiming sodic soils had been reported to be effective in sandy soils with sufficient permeability, additional study is needed for its use in saline sodic soils under the high evaporative demand. The use of cool season grass after initial salt leaching with CaCl2 should be explored. Results obtained from this project have several potential applications, which include the use of crop residues for maintaining sodium balance, the use of CaCl2 for initial leaching of poorly permeable clayey sodic soils, and appraisal of sodicity effects, and appropriate rates and types of amendments required for reclamation

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Gerstl, Zev, Thomas L. Potter, David Bosch, Timothy Strickland, Clint Truman, Theodore Webster, Shmuel Assouline, Baruch Rubin, Shlomo Nir e Yael Mishael. Novel Herbicide Formulations for Conservation-Tillage. United States Department of Agriculture, giugno 2009. http://dx.doi.org/10.32747/2009.7591736.bard.

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The overall objective of this study was to develop, optimize and evaluate novel formulations, which reduce herbicide leaching and enhance agronomic efficacy. Numerous studies have demonstrated that CsT promotes environmental quality and enhances sustainable crop production, yet continued use of CsT-practices appears threatened unless cost effective alternative weed control practices can be found. The problem is pressing in the southern portion of the Atlantic Coastal Plain region of the eastern USA where cotton and peanut are produced extensively. This research addressed needs of the region’s farmers for more effective weed control practices for CsT systems. HUJI: CRFs for sulfentrazone and metolachlor were developed and tested based on their solubilizion in cationic micelles and adsorption of the mixed micelles on montmorillonite. A better understanding of solubilizing anionic and nonionic organic molecules in cationic micelles was reached. Both CRFs demonstrated controlled release compared to the commercial formulations. A bioassay in soil columns determined that the new sulfentrazone and metolachlor CRFs significantly improve weed control and reduced leaching (for the latter) in comparison with the commercial formulations. ARO: Two types of CRFs were developed: polymer-clay beads and powdered formulations. Sand filter experiments were conducted to determine the release of the herbicide from the CRFs. The concentration of metolachlor in the initial fractions of the effluent from the commercial formulation reached rather high values, whereas from the alginate-clay formulations and some of the powdered formulations, metolachlor concentrations were low and fairly constant. The movement of metolachlor through a sandy soil from commercial and alginate-clay formulations showed that the CRFs developed significantly reduced the leaching of metolachlor in comparison to the commercial formulation. Mini-flume and simulated rainfall studies indicated that all the CRFs tested increased runoff losses and decreased the amount of metolachlor found in the leachate. ARS: Field and laboratory investigations were conducted on the environmental fate and weed control efficacy of a commercially available, and two CRFs (organo-clay and alginate-encapsulated) of the soil-residual herbicide metolachlor. The environmental fate characteristics and weed control efficacy of these products were compared in rainfall simulations, soil dissipations, greenhouse efficacy trials, and a leaching study. Comparisons were made on the basis of tillage, CsT, and conventional, i.e no surface crop residue at planting (CT). Strip-tillage (ST), a commonly used form of CsT, was practiced. The organo-clay and commercial metolachlor formulations behaved similarly in terms of wash off, runoff, soil dissipation and weed control efficacy. No advantage of the organo-clay over the commercial metolachlor was observed. Alginate encapsulated metolachlor was more promising. The dissipation rate for metolachlor when applied in the alginate formulation was 10 times slower than when the commercial product was used inferring that its use may enhance weed management in cotton and peanut fields in the region. In addition, comparison of alginate and commercial formulations showed that ST can effectively reduce the runoff threat that is commonly associated with granular herbicide application. Studies also showed that use of the alginate CRF has the potential to reduce metolachlor leaching. Overall study findings have indicated that use of granular herbicide formulations may have substantial benefit for ST-system weed management for cotton and peanut production under Atlantic Coastal Plain conditions in the southeastern USA. Commercial development and evaluation at the farm scale appears warranted. Products will likely enhance and maintain CsT use in this and other regions by improving weed control options.

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HILL, KATIE, e ELIEL VILLA-ALEMAN. JANUARY 2022 SEMIANNUAL SALTSTONE TOXICITY CHARACTERISTIC LEACHING PROCEDURE (TCLP) RESULTS. Office of Scientific and Technical Information (OSTI), luglio 2022. http://dx.doi.org/10.2172/1880619.

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HILL, KATIE. JULY 2022 SEMIANNUAL SALTSTONE TOXICITY CHARACTERISTIC LEACHING PROCEDURE (TCLP) RESULTS. Office of Scientific and Technical Information (OSTI), aprile 2023. http://dx.doi.org/10.2172/1972838.

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Hill, K. SALTSTONE FIRST QUARTER CALENDAR YEAR 2018 (1QCY18) TOXICITY CHARACTERISTIC LEACHING PROCEDURE (TCLP) RESULTS. Office of Scientific and Technical Information (OSTI), agosto 2018. http://dx.doi.org/10.2172/1471994.

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Hill, K. A. Saltstone First Quarter Calendar Year 2018 (1QCY18) Toxicity Characteristic Leaching Procedure (TCLP) Results. Office of Scientific and Technical Information (OSTI), agosto 2018. http://dx.doi.org/10.2172/1472003.

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Hill, K. A. Saltstone Second Quarter Calendar Year 2018 (2QCY18) Toxicity Characteristic Leaching Procedure (TCLP) Results. Office of Scientific and Technical Information (OSTI), novembre 2018. http://dx.doi.org/10.2172/1495083.

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