Relevant bibliographies by topics / Granular ferric hydroxide

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Academic literature on the topic 'Granular ferric hydroxide'

Author: Grafiati
Published: 4 June 2021
Last updated: 26 January 2023

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Journal articles on the topic "Granular ferric hydroxide"

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Sun, J. L., C. Shang, and G. A. Kikkert. "Hydrogen sulfide removal from sediment and water in box culverts/storm drains by iron-based granules." Water Science and Technology 68, no. 12 (October 25, 2013): 2626–31. http://dx.doi.org/10.2166/wst.2013.543.

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A renewable granular iron-based technology for hydrogen sulfide removal from sediment and water in box culverts and storm drains is discussed. Iron granules, including granular ferric hydroxide (GFH), granular ferric oxide (GFO) and rusted waste iron crusts (RWIC) embedded in the sediment phase removed aqueous hydrogen sulfide formed from sedimentary biological sulfate reduction. The exhausted iron granules were exposed to dissolved oxygen and this regeneration process recovered the sulfide removal capacities of the granules. The recovery is likely attributable to the oxidation of the ferrous iron precipitates film and the formation of new reactive ferric iron surface sites on the iron granules and sand particles. GFH and RWIC showed larger sulfide removal capacities in the sediment phase than GFO, likely due to the less ordered crystal structures on their surfaces. This study demonstrates that the iron granules are able to remove hydrogen sulfide from sediment and water in box culverts and storm drains and they have the potential to be regenerated and reused by contacting with dissolved oxygen.
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Abdallah, Elsadig A. M., and Graham A. Gagnon. "Arsenic removal from groundwater through iron oxyhydroxide coated waste productsA paper submitted to the Journal of Environmental Engineering and Science." Canadian Journal of Civil Engineering 36, no. 5 (May 2009): 881–88. http://dx.doi.org/10.1139/s08-059.

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The goal of this research was to remove arsenic from groundwater supplies via adsorption into media obtained from waste material generated as by-products from glass recycling programs and the seafood industry such as crushed glass and scallop shells. During the course of this research four new adsorbents were developed: ferric hydroxide coated crushed glass (FHCCG); ferric oxide coated crushed glass (FOCCG); ferric hydroxide coated scallop shells (FHCSS); and ferric oxide coated scallop shells (FOCSS). The adsorbents were characterized through evaluation of their structure, surface area, chemical composition, iron content, and coating stability. Efficiency of the adsorbents to remove arsenic from water was examined through batch kinetic and isotherm adsorption experiments. The adsorption capacity of the adsorbents was also evaluated by performing column experiments using real ground waters and a synthetic water. Arsenic removal to a concentration less than 10 μg/L was achieved with the FHCSS and more than 9000 bed volumes of water were treated before the breakthrough point was reached. The research results revealed that scallop shells coated with ferric hydroxideperformed better than crushed glass coated with ferric hydroxide. Both FOCCG and FOCSS had poor arsenic removal compared with FHCSS and granular ferric hydroxide (GFH). Ferric hydroxide coated scallop shells performed similarly to GFH.
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Shams, Mahmoud, Mehdi Qasemi, Mojtaba Afsharnia, and Amir Hossein Mahvi. "Sulphate removal from aqueous solutions by granular ferric hydroxide." Desalination and Water Treatment 57, no. 50 (January 13, 2016): 23800–23807. http://dx.doi.org/10.1080/19443994.2015.1135479.

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Kumar, Eva, Amit Bhatnagar, Minkyu Ji, Woosik Jung, Sang-Hun Lee, Sun-Joon Kim, Giehyeon Lee, et al. "Defluoridation from aqueous solutions by granular ferric hydroxide (GFH)." Water Research 43, no. 2 (February 2009): 490–98. http://dx.doi.org/10.1016/j.watres.2008.10.031.

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Bhatnagar, Amit, YangHun Choi, YeoJoon Yoon, Yongsoon Shin, Byong-Hun Jeon, and Joon-Wun Kang. "Bromate removal from water by granular ferric hydroxide (GFH)." Journal of Hazardous Materials 170, no. 1 (October 2009): 134–40. http://dx.doi.org/10.1016/j.jhazmat.2009.04.123.

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Xie, B., M. Fan, K. Banerjee, and J. Hans Van Leeuwen. "Modeling of arsenic(V) adsorption onto granular ferric hydroxide." Journal - American Water Works Association 99, no. 11 (November 2007): 92–102. http://dx.doi.org/10.1002/j.1551-8833.2007.tb08083.x.

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Zhao, Bei, Yu Zhang, Xiaomin Dou, Hongying Yuan, and Min Yang. "Granular ferric hydroxide adsorbent for phosphate removal: demonstration preparation and field study." Water Science and Technology 72, no. 12 (August 18, 2015): 2179–86. http://dx.doi.org/10.2166/wst.2015.438.

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Ferric hydroxide (FHO), which has high phosphate adsorption capacity, was prepared by precipitation at industrial scale and then fabricated via the drum granulation method with cross-linked poly(vinyl alcohol) as the binder. The optimum binder/FHO powder ratio was 0.6 for producing a granular adsorbent with a high phosphate adsorption capacity and stability. The Langmuir maximum adsorption capacities of powder and granular FHOs were 74.07 mg g−1 and 56.18 mg g−1 at pH 7.0 ± 0.2, respectively, which were higher than those of other reported phosphate adsorbents under neutral or acidic conditions. Phosphate-loaded granular FHO could be regenerated by NaOH solution. Columns containing the granular FHO were used for phosphate removal from ozonated secondary effluents of a municipal wastewater treatment plant at space velocity (SV) of 2 and 5 h−1. During more than 2 months’ operation, the average removal percentage of PO43– was more than 90% and the turbidity and concentration of CODMn in the effluents were lower than in the influents. In addition, energy dispersive X-ray results suggested that active sites inside the granular FHO were available for phosphate removal. The results demonstrated that granular FHO can be applied as an assist technology for phosphate removal from secondary effluents.
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Sperlich, Alexander, Sebastian Schimmelpfennig, Benno Baumgarten, Arne Genz, Gary Amy, Eckhard Worch, and Martin Jekel. "Predicting anion breakthrough in granular ferric hydroxide (GFH) adsorption filters." Water Research 42, no. 8-9 (April 2008): 2073–82. http://dx.doi.org/10.1016/j.watres.2007.12.019.

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Fleming, David E. B., Isadel S. Eddy, Mihai R. Gherase, Meaghan K. Gibbons, and Graham A. Gagnon. "Real-time monitoring of arsenic filtration by granular ferric hydroxide." Applied Radiation and Isotopes 68, no. 4-5 (April 2010): 821–24. http://dx.doi.org/10.1016/j.apradiso.2009.09.048.

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Hilbrandt, Inga, Aki Sebastian Ruhl, Frederik Zietzschmann, Merle Molkenthin, and Martin Jekel. "Competition in chromate adsorption onto micro-sized granular ferric hydroxide." Chemosphere 218 (March 2019): 749–57. http://dx.doi.org/10.1016/j.chemosphere.2018.11.152.

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Dissertations / Theses on the topic "Granular ferric hydroxide"

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Chen, Yingying, and Yingying Chen. "Removing Phosphonate Antiscalants from Membrane Concentrate Solutions using Ferric Hydroxide Adsorbents." Thesis, The University of Arizona, 2017. http://hdl.handle.net/10150/624128.

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Phosphonate antiscalants are commonly used in nanofiltration and reverse osmosis water treatment to prevent membrane fouling by mineral scale. In many circumstances it is desirable to remove these phosphonate compounds before concentrate disposal or further treatment. This research investigated the removal of phosphonate compounds from simulated membrane concentrate solutions using ferric hydroxide adsorbents. Two phosphonate antiscalants were investigated, Permatreat 191® (PT191) and nitrilotrimethylphosphonic acid (NTMP). Batch adsorption isotherms and column breakthrough and regeneration experiments were performed on two commercial adsorbents and a ferric hydroxide loaded polyacrylonitrile fiber adsorbent prepared in our laboratory. The best performing adsorbent was Granular Ferric Hydroxide® (GFH) obtained from GEH Wasserchemie. Adsorption isotherms measured after 24-hour equilibration periods showed initial concentration effects, whereby the isotherms were dependent on the initial adsorbate concentration in solution. Significant differences in adsorption behavior were observed between the PT191 and the NTMP adsorbates. Differences in adsorption behavior between NTMP and PT191 are all consistent with the PT191 containing fewer phosphonate functional groups per molecule than NTMP. Desorption rates were bimodal, with 40-50% of the adsorbed phosphonate being released on a time scale of 10-24 hours, while the remaining fraction was released approximately one order of magnitude more slowly. The slow desorbing fraction primarily resulted from equilibrium effects resulting from significant phosphonate adsorption, even in 1.0 mol/L NaOH solutions. Complete regeneration could not be achieved, even after eluting the adsorbent columns with more than 300 bed volumes of 1.0 mol/L NaOH. However, the incomplete regeneration had only a minor effect on phosphonate uptake in subsequent column breakthrough experiments.
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Newton, Nichola. "Preparation and properties of granular ferric hydroxide as an adsorbent in potable water treatment." Thesis, Loughborough University, 2002. https://dspace.lboro.ac.uk/2134/7866.

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Three iron oxide materials have been studied for uptake of three anions (arsenate, phosphate and fluoride) and a cation (cadmium) from aqueous solutions. Two of the materials were produced using original procedures developed at Loughborough University. The former material was conditioned by a controlled freeze-thaw procedure to enhance granularity and the latter was air-dried at room temperature. Their capacities were compared with a commercially available material supplied by GEH Wasserchemle, Germany. Pore size distributions and specific surface area values were determined by N2 analysis at 77 K. All samples possessed a reasonable specific surface area, in the range 200-300 m2/g and were mesoporous. Samples produced at Loughborough University also contained some macropores, evidence of a more amorphous structure or lack of pH control during production. X-ray diffraction indicated that all samples had some b-FeOOH present and that the chloride content and production pH affected the material crystallinity. Crystallinity increased with increasing chloride content and a higher production pH resulted in the presence of more than one phase. Chemical characterisation was also completed on all three samples. The point of zero net proton charge and isoelectric point for each material was obtained by potentiometric batch titrations and zeta potential measurements respectively. The difference in these values increased with a higher chloride content and all samples studied possessed a positive surface at low pH and negative surface at high pH. These parameters were not greatly affected by the background electrolyte concentration, implying that the background electrolyte is not specifically adsorbed. However, arsenate and phosphate appeared to be specifically adsorbed as the isoelectric point decreased. The uptake capacities for arsenate, phosphate. fluoride and cadmium of all three samples were obtained by measuring batch isotherms at 25 degrees C. The pH range was 4-9, using various initial concentrations up to a maximum of approximately 30 uM. For all anionic species studied, the capacity decreased with increasing pH, and the reverse trend was noted for cadmium. The Langmuir model provided a good fit for the anionic isotherms and the Freundlich model for the cationic isotherms. The materials studied possessed a markedly higher capacity for fluoride than arsenate and phosphate, with an intermediate capacity for cadmium. This indicates that fluoride is attached to the surface via monodentate (single) bonds, whilst both arsenate and phosphate are primarily attached to the surface via bidentate (two) bonds. Cadmium is probably bound by both these mechanisms. The effect of competing anions on arsenic uptake capacity was determined using mini-column experiments of binary (arsenate-fluoride, arsenate-Phosphate and phosphate-fluoride) and ternary (arsenate-fluoride-phosphate) mixtures. Arsenate removal was strongly affected by the presence of phosphate, but was only slightly lower in the presence of fluoride. (Continues...).
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Öckerman, Hannes, and Emma Lundin. "Removal of Arsenic in Ground Water from Northern Burkina Faso through Adsorption with Granular Ferric Hydroxide : A SIDA Minor Field Study at the Department of Chemistry, University of Ouagadougou." Thesis, Uppsala universitet, Luft-, vatten och landskapslära, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-268676.

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The need of making arsenic contaminated ground water potable is urgent in parts of Burkina Faso. An implementation of a treatment design using Granular Ferric Hydroxide (GFH) is under development. Water from a tube-well in Lilgomdé, Yatenga province, Burkina Faso, has been treated with the adsorbent GFH through column experiments. The water had an arsenic concentration varying between 99 and 215 μg/L and an average pH of 7.9. The study has shown that arsenic, predominantly in the form of arsenate, can be adsorbed to the material in significant amounts despite a high natural pH and the presence of ions competing with arsenic for adsorption sites on the GFH. When run through the column, the pH of the effluent water drastically decreased in the beginning. However, the low pH was soon followed by a slower readjustment towards the pH of the influent water. The adsorption of phosphates and fluorides was also studied. Both competitors exist in higher molar quantities than arsenic in the ground water. Even though arsenic displays a higher affinity for the GFH, an average 44 % of total phosphate and 64 % of the fluoride were adsorbed, making them a factor affecting the results of the study. Hydrogen carbonate is also believed to affect the adsorption process but this could not be confirmed. The empty bed contact time (EBCT), describing the average time of contact between the adsorbent and the water, has shown to be of importance. Increasing the EBCT resulted in notably more arsenic being adsorbed per volume GFH. When increasing the contact time, the study showed that reducing the speed of the flow was more effective than increasing the volume of the adsorbent. The GFH was also found to have a self-regenerating ability to a certain extent. When interrupting the experiment and leaving the column material in the aqueous solution for several days, the arsenic adsorption capacity after the break was shown to be higher than just before it. A 13 % increased capacity was shown in one experiment. Conclusively, the results of this study suggest no hindrances towards developing larger scale columns and prototypes to be applied at tube-well pump stations. Further investigations on the treatment method with GFH, on arsenic contaminated water, are recommended.
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Pepper, Rachel Anais. "Synthesis of akaganeite sorbents from red mud wastes and their performance in water treatment applications." Thesis, Queensland University of Technology, 2018. https://eprints.qut.edu.au/122896/1/Rachel_Pepper_Thesis.pdf.

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Processing of mineral ores leads to the generation of large amounts of solid waste, which can contain a high proportion of metal values. This thesis addressed this issue, by re-using a waste product from aluminium mining to make a new water treatment material. This water treatment material showed improved performance for wastewater, compared to a commercially available product. Overall, this thesis represents a new pathway to obtain a valuable product from a mine waste material.
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Lovell, Jessica, and Sandra Levin. "Removal of hexavalent chromium in wastewater using granular ferric hydroxides." Thesis, Uppsala universitet, Institutionen för geovetenskaper, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-265899.

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This study took place in Malawi, south eastern Africa. Metal contamination of water and soil is a threat to the environment and human health and is a serious concern in many countries including Malawi. Blantyre is the city of commerce where most of the industry is located along the banks of the main rivers. Some of the industries produce wastewater, which due to poor access to wastewater treatment plants, is discharged without treatment into the environment. A match factory in Blantyre uses chromium as a colouring agent for match heads and very high concentrations of chromium(VI) have been measured downstream the factory with concentrations up to 56 mg/l, which is much higher than the WHO guidelines of 0.05 mg/l.  Chromium(VI) mainly occurs as chromate CrO42- and dichromate Cr2O72- ions. They are both toxic and carcinogenic and can cause mutations and chromosomal aberrations.   The aim of the study was to evaluate the efficiency of Granular Ferric Hydroxide (GFH) in adsorbing and removing chromium from an aqueous phase. Wastewater was collected from the match factory and by optimizing relevant parameters the removal efficiency was maximized. The parameters optimized were pH, dosage and contact time and the effect of initial concentration. After respective experiment, all samples were analysed for chromium using microwave plasma atomic emission spectroscopy (MP-AES).   The optimum pH was chosen to 8.0, the dosage to 17.4 g GFH/l and the contact time to 2 hours for a 95% removal of total chromium in undiluted wastewater. The removal efficiency of the GFH was 2.84 mg Cr/g GFH. To implement wastewater purification with GFH a number of practical issues have to be taken into consideration. Above all, a sufficient stirring method has to be devised as the removal efficiency is much affected by improper stirring.
Denna studie genomfördes i Malawi, sydöstra Afrika. Metallföroreningar i vatten och mark är ett stort problem i många länder, inklusive Malawi. Landets centrum för industri och handel ligger i Blantyre där de flesta av industrierna ligger längs med floderna. En del industrier genererar utsläppsvatten och på grund av dålig tillgång till vattenreningsteknik och vattenreningsanläggningar släpps mycket av det förorenade vattnet obehandlat ut i naturen. En tändsticksfabrik i Blantyre använder kromsalter för att färga tändstickshuvudena röda och höga koncentrationer av sexvärt krom har uppmätts nedströms fabriken. De uppmätta koncentrationerna var upp till 56 mg/l vilket är betydligt högre än WHO:s riktvärde på 0,05 mg/l. Sexvärt krom förekommer som kromat CrO42- och dikromat Cr2O72- joner vilka båda är mycket toxiska och cancerframkallande och därmed ett hot mot miljö och människor. Syftet med studien var att undersöka om granulära järnoxider (GFH) kunde användas som en adsorbent för att rena utsläppsvatten från kromater. Utsläppsvatten hämtades från tändsticksfabriken och genom att optimera relevanta parametrar kunde GFHns adsorbtionseffektivitet maximeras. Parametrarna som optimerades var pH, dos, kontakttid och initialkoncentration. Efter respektive experiment mättes kromkoncentrationen med mikrovågsplasma atomemissionsspektroskopi (MP-AES) Det optimala pH-värdet valdes till 8.0, dosen till 17.4 g GFH/l med en kontakttid på 2 timmar för en 95.3% reningsgrad på outspätt utsläppsvatten. Adsorptionseffektiviteten på GFHn var 2.84 mg Cr/g GFH. För att implementera vattenrening med GFH behöver flera praktiska aspekter tas med i beaktning. Framförallt är det viktigt med en bra omrörning för att GFHn ska kunna adsorbera effektivt.
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Huang, Zin-Win, and 黃任偉. "Adsorption of arsenic by Granular Ferric Hydroxide in groundwater." Thesis, 2002. http://ndltd.ncl.edu.tw/handle/k4c532.

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碩士
國立成功大學
環境工程學系碩博士班
90
Arsenic is a common natural contaminant in the groundwater of southwestern and northeastern parts of Taiwan. The arsenic concentration in ground water ranges from mg/L level to mg/L level. Long-term consumption of arsenic-contaminated groundwater is risky to the human body and therefore Taiwan EPA has revised the standard of arsenic in drinking water from 50 mg/L to 10 mg/L at the end of 2000. However, the conventional water treatment processes may not be able to remove arsenic to a concentration complied with the standard. Therefore, a commercial adsorbent—granular ferric hydroxide (GEH), is investigated in this study for its adsorptive behavior, and to understand its use in practical application. During this equilibrium adsorptive experiment, the variation of pH value in de-ion waters while the amount of arsenic being adsorbed by GEH was first explored. Result of this experiment showed that when the pH value was lowered, the adsorptive capacity has the tendency to increase. When the initial concentration was at 6.1 mg/L, the pH value decreased from 10.2 to 6.9 and the adsorptive capacity increased from 12.1mg/g (dry geh) to 36.2mg/g (dry geh). Subsequently, this research sought after understanding the competition of a anion—phosphate and its competitive effect. Using the initial molar ratio (IMR) between phosphate and arsenic (V) to investigate, result of the experiment showed that the amount adsorbed decreased by about 40% between IMR=0 and IMR=5, but showed no significant difference between IMR=5, 10, 15, and 20. Lastly is the research on the application of the equivalent background compound（EBC）model. Initial result shows that the EBC mode could be applied to the GEH equilibrium experiment where As(V) was added to the Santiaolun groundwater, where there is still room for investigation in its detailed theory and application. The kinetic adsorption experiment focused mainly on using the result of the kinetic adsorption experiment to carry out the simulation and prediction of the pore diffusion model (PDM). The adsorptive equilibrium parameter required using this model could be substituted with the Freundlich or the Langmuir Isotherm parameters. Particle diameter of the GEH chosen ranged in three groups, between 30-40mesh, 30-70mesh, and 80-100mesh. Study show that the optimal range of the pore diffusion model was between 8.0*10-8cm2/sec and 5.0*10-7cm2/sec, while the tortuosity was between 20 and 125. The column experiment was divided into the small-scale column in the laboratory and thebig-scale column at Santiaolun in Yunlin. Result of the small-scale column experiment showed that the initial As(V) concentration was at 125±15μg/L, EBCT=82.4sec when the concentration was less than 10μg/L, the bed value (BV) was 106,000BV. At this moment, the capacity of GEH to As(V) was 12,200mg/m3, 5-10 times greater than the capacity of active alumna(AA) . The experiment at Santiaolun, Yunlin, used treated water from Santiaolun water purifying treatment center, with the arsenic concentration level at 8-16μg/L. This column has been in operation for more than 6 months to date and the water production has been consistently within the legal parameter of less than 10μg/L. However, when compared with related records it was found that the capacity of GEH inside the column was low, which, was speculated as due to the result of bad mass transmission of the column interior, and thus requires further research and discussion.
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Lien, Szu-Chi, and 連思琦. "Removal of molybdenum from water by granular ferric hydroxide." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/86617619468607280912.

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碩士
淡江大學
水資源及環境工程學系碩士班
101
The Taiwan Environmental Protection Agency enforced molybdenum regulation of 0.07 mg/L in drinking water quality standards in 2008. This study evaluates the adsorption of molybdenum (Mo) by granular ferric hydroxide (GFH). All experiments are conducted by batch isothermal and kinetic adsorption methods. The experimental parameters include type and dosage of GFH, pH, initial Mo concentration, contact time, temperature and competitive anions. Moreover, the Mo-containing water sample is prepared from (NH4)2MoO4 ICP-MS analytical-grade solution. The purpose of this study are to investigate (1) the effect of experimental parameters on the adsorption of Mo by GFH, (2) the isothermal adsorption of Mo by GFH, and (3) kinetic adsorption of Mo by GFH. The results show that the removal of Mo could reach more than 80% by GFH, in contrast, it was less than 25% by both powdered activated carbon and powdered activated aluminum. Thus, GFH was selected as an adsorbent for adsorption of Mo in this study. The isoelectric point of GFH surface was 7.0. The optimum pH for GFH adsorption of Mo ranged from 4 to 7 and the amount of adsorbed Mo is about 5 times as that at pH 9-10. For the same GFH dosage, the amount of adsorbed Mo increased with increasing initial concentration of Mo and the maximum adsorption capacity reached to 25 mg-Mo/g-GFH. However, it decreased with increasing GFH dosage for the same initial concentration of Mo. The order of adsorption efficiency by temperature was 45oC>25oC >10oC. The effect of PO43- on the adsorption of Mo was observed to be stronger than that of Cl-, NO3-, SO42-. Furthermore, the adsorption data fitted the Freundlich isotherm model well. The n value in Freundlich isotherm model was increased with increasing both initial concentration of Mo and temperature. The kinetic adsorption followed the Lagergern pseudo-second-order kinetics. The adsorption rate constant, k2 value increased linearly with increasing GFH dosage, while it decreased with increasing initial concentration of Mo.
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Huang, Chun-Lin, and 黃俊霖. "Comparisons of Phosphate removal between blast furnace slags and Granular Ferric Hydroxide." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/74376055914204764282.

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碩士
淡江大學
水資源及環境工程學系碩士班
102
Basic oxygen furnace steel slag (BOF) is an industry by-product from steel manufacture and is a low-cost adsorbent. Granular ferric hydroxide (GFH) is a commercial available adsorbent. This study compares the adsorption removal of phosphate between BOF and GFH. BOF from The China steel company and phosphate-containing synthetic water were used in this study. The operational parameters included water washed, pH, type and dosage of adsorbent (BOF and GFH), initial concentration of phosphate (P), and contact time. All experiments were conducted by the batch. Furthermore, the chemical composition and surface morphology of adsorbents were examined by energy dispersive spectrum (EDS) and scanning electron microscopy (SEM), respectively. The results of chemical composition from EDS tests show that BOF contained 12.6% of Ca (wt%), which released Ca ions from the slag into solution to induce high pH levels to above 11. The released Ca ions could react with P to form the precipitation of Ca-phosphate compounds. The released Ca ions concentration increased with the increasing dosage of BOF and leaded to increase removal of P. In contrast, the chemical composition of GFH did not contain Ca but contained 68% (wt %) of Fe. The removal mechanism of P by GFH was predominant by the formation of Fe- phosphate compounds onto GFH surface. The SEM micrographs show that Fe-phosphate compounds formed on the GFH surface. The optimum pH for the removal of P by BOF and GFH was at 11 and 4, respectively. The phosphate removal capacity (PRC) of BOF was about 3-4times of that of GFH. The removal of P increased with the increasing both dosage of BOF and GFH. Original BOF could remove more than 90% of P, whereas it was about 20% for water washed BOF. The removal of P by BOF did not increase significant as contact time extended more than 30 min because more than 90% of dissolution of Ca ions occurred during the contact time less than 30 min. However, the removal of P by GFH increased with the increasing contact time. Moreover, commercial price of GFH was higher as about 120 times of BOF. Overall, the removal mechanism of P by BOF and GFH was precipitation and adsorption, respectively. Based on the PRC and economic feasibility, BOF is a cost-effective adsorbent than GFH for the removal of P.
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Sperlich, Alexander [Verfasser]. "Phosphate adsorption onto granular ferric hydroxide (GFH) for wastewater reuse / vorgelegt von Alexander Sperlich." 2010. http://d-nb.info/1009612980/34.

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Chuang, Chiao-Chun, and 張喬竣. "Adsorption of Copper(Ⅱ) Ions from Aqueous Solution by Chitosan-coated Granular Ferric Hydroxide." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/44691558320598773098.

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碩士
嘉南藥理科技大學
環境工程與科學系碩士班
96
Because of the dramatic develop of industry, heavy metal pollution has become a global environmental considerations. The heavy metals in the soil and groundwater have endangered our environment and human body by direct or indirect pathway. Thus, how to solve efficiently the heavy metal pollution in groundwater has become the most essential issue around the world. Theoretically, the one of most efficiency treatment methods for groundwater contaminated site was “ex-situ” and “in-situ” remediation. The most widely application based on the idea of in-situ remediation in US is permeable reactive barrier, due to its economical efficiency in treating large contamination area, and was widely accepted as an efficiency technology for groundwater remediation. Biopolymer is a biodegradable material, and becomes a newly developing tendency for many industries. The formation of biodegradable material is using nature organisms as the base unit, including microorganisms, plants and animals. Moreover, the used biodegradable material can be degraded by landfill, which provides the nutrient for microorganisms, plants and animals. Thus, nature resources can be recycled and reused, which achieves the goal of sustainable regeneration. Based on this concept, obtaining form insects, the shell of aquatic coruscations (crab and shrimp), and the cell wall of fungus, Chitin and Chitosan have widely applied in the adsorption study of heavy metal based on their chemical structures, reaction characteristics and modification properties. This research is based on the ideal of green design and using biodegradable material (Chitosan) coated with iron oxide (GEH), which performed the process optimization for this biodegradable adsorbent. The optimized adsorbents executed the adsorption studies, and evaluated theisothermal studies for heavy metals (Cu(II)). The results indicated that the copper adsorption capacity reached 4.89mg/g. The equilibrium adsorption data were analyzed using Langmuir and Freundlich isotherm model, where the results fitted well in both two isotherm models. The maximum adsorption capacity calculated from Langmuir adsorption isotherm was 7.03 mg/g GEH for Cu(II). Moreover, the kinetic data were tested using pseudo first-order and pseudo-second order reaction. The kinetics experimental data followed pseudo-second order reaction which indicated that the chemical sorption is the rate-limiting step. Therefore, in the aspect of the environmental remediation, the adsorption results of GEH indicated that the recycle and reuse of waste sludge from water treatment plant could be a possible method in the future.
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Book chapters on the topic "Granular ferric hydroxide"

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Bahr, C., and W. Ewy. "Drinking water dearsenification with granular ferric hydroxide." In Arsenic in the Environment - Proceedings, 667–69. CRC Press, 2014. http://dx.doi.org/10.1201/b16767-249.

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Graieb, O., and J. Lujan. "Arsenic reduction levels in drinking water using granular ferric hydroxide oxide." In Arsenic in the Environment - Proceedings, 673–74. CRC Press, 2014. http://dx.doi.org/10.1201/b16767-251.

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Mahvi, A., A. Asgari, N. Yousefi, S. Hosseini, S. Hosseini, H. Malidareh, and S. Namavar. "Granular Ferric Hydroxide (GFH) shows promise for removal of natural arsenic from water." In Arsenic in the Environment - Proceedings, 719–21. CRC Press, 2014. http://dx.doi.org/10.1201/b16767-267.

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Kumar, P., R. Flores, L. Önnby, and C. Sjöstedt. "Arsenic adsorption by iron-aluminium hydroxide coated onto macroporous supports: Insights from X-ray absorption spectroscopy and comparison with granular ferric hydroxides." In Arsenic in the Environment - Proceedings, 478–79. CRC Press, 2016. http://dx.doi.org/10.1201/b20466-222.

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Bahr, C., F. Tarah, and M. Mahdyarfar. "Iran’s first waterworks with granular ferric hydroxide-based dearsenification – a look back over the first two years of operation." In Environmental Arsenic in a Changing World, 607–9. CRC Press, 2019. http://dx.doi.org/10.1201/9781351046633-241.

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Reports on the topic "Granular ferric hydroxide"

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Neidel, Linnah L., James Lee Krumhansl, Malcolm Dean Siegel, and Nadim Reza Khandaker. Performance evaluation of ALCAN-AASF50-ferric coated activated alumina and granular ferric hydroxide (GFH) for arsenic removal in the presence of competitive ions in an active well :Kirtland field trial - initial studies. Office of Scientific and Technical Information (OSTI), January 2006. http://dx.doi.org/10.2172/883491.

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