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Articoli di riviste sul tema "Flocculation"

Autore: Grafiati

Pubblicato: 4 giugno 2021

Ultima modifica: 25 luglio 2025

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1

P. Radhakrishnan, Anand N., Marco P. C. Marques, Matthew J. Davies, Brian O'Sullivan, Daniel G. Bracewell, and Nicolas Szita. "Flocculation on a chip: a novel screening approach to determine floc growth rates and select flocculating agents." Lab on a Chip 18, no. 4 (2018): 585–94. http://dx.doi.org/10.1039/c7lc00793k.

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2

Kurbiel, J., A. Sapulak, and H. Schade. "The Use of a Turbulent Pipe-Flow for Rapid Flocculation of Precipitate in the Electroplating Wastewater Treatment." Water Science and Technology 24, no. 7 (1991): 255–59. http://dx.doi.org/10.2166/wst.1991.0208.

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The paper presents the results of an experimental pilot study on advanced flocculation of metal hydroxides that are precipitated from electroplating wastewater during pH-adjustment. A pipe-flocculator with a turbulent flow, to ensure proper mixing conditions, was used instead of a classical flocculation tank. The results of the study indicated a high efficiency of the process. The flocculation proceeded within 50-100 seconds, which was much less than is required during classical flocculation. Application of a pipe-flocculator results also in reduction of both capital and operating costs of the

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3

Balakrishna, K., B. R. Manjunatha, and R. Shankar. "A Laboratory Study of the Flocculation of Dissolved Heavy Metals in Kali RiverDuring Estuarine Mixing, West Coast of India." Journal Geological Society of India 50, no. 6 (1997): 753–58. http://dx.doi.org/10.17491/jgsi/1997/500611.

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Abstract River water-sea water mixing experiments were carried out to study the time dependence of flocculation process, the flocculation behaviour of dissolved Cu, Pb, Zn, Ni, Co, Mn, Cr and Fe in the Kali estuary. Flocculation appears to be maximum at high salinities (&gt;25‰) and is rapid, about 7 to 60% of the dissolved metal content flocculating within half an hour of mixing. This brings out the role of sea water as a powerful flocculating agent for the dissolved load of river water.

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4

Dong, Ming, and Qiong Fang Shao. "Study of a Novel Honeycomb Continuous Flocculator." Advanced Materials Research 1033-1034 (October 2014): 435–38. http://dx.doi.org/10.4028/www.scientific.net/amr.1033-1034.435.

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The continuous flocculator described in this article refers to a kind of continuous flocculation device designed to flocculate fermentation liquid. The honeycomb continuous flocculator is composed of a vessel and built-in trapezoid subassemblies, which divide the space within the vessel into multiple honeycomb channels. The length ratio between the longest diagonal of the regular hexagon and the axial length of the channel is within the range 0.01–0.04; and the internal surface roughness (Ra) of the channels should be 0 < Ra ≤ 0.2 μm. In contrast to current flocculator designs, the channels

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5

Lai, Yan Ping, and Jian Hai Zhao. "The Numerical Simulation Study of a Flocculation Reactor." Applied Mechanics and Materials 260-261 (December 2012): 1022–25. http://dx.doi.org/10.4028/www.scientific.net/amm.260-261.1022.

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Three-dimensional flow field of flocculating reactor is simulated. Numerical results were applied to analyze and explain influence of flow field under different flocculation conditions. The results indicate that k, ε can reasonably explain flocculation effect, and meanwhile verify the better applicability as the CFD numerical simulation evaluation indexes of flocculation effect. The results can be extended to find an effective way to optimize the design and operation, to improve the efficiency of flocculation.

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6

Westman, Johan O., Valeria Mapelli, Mohammad J. Taherzadeh, and Carl Johan Franzén. "Flocculation Causes Inhibitor Tolerance in Saccharomyces cerevisiae for Second-Generation Bioethanol Production." Applied and Environmental Microbiology 80, no. 22 (2014): 6908–18. http://dx.doi.org/10.1128/aem.01906-14.

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ABSTRACTYeast has long been considered the microorganism of choice for second-generation bioethanol production due to its fermentative capacity and ethanol tolerance. However, tolerance toward inhibitors derived from lignocellulosic materials is still an issue. Flocculating yeast strains often perform relatively well in inhibitory media, but inhibitor tolerance has never been clearly linked to the actual flocculation abilityper se. In this study, variants of the flocculation geneFLO1were transformed into the genome of the nonflocculating laboratory yeast strainSaccharomyces cerevisiaeCEN.PK 11

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7

Li, Rongpeng, Xuesong Li, Lei Sun, et al. "Reduction of Ribosome Level Triggers Flocculation of Fission Yeast Cells." Eukaryotic Cell 12, no. 3 (2013): 450–59. http://dx.doi.org/10.1128/ec.00321-12.

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ABSTRACTDeletion of ribosomal protein L32 genes resulted in a nonsexual flocculation of fission yeast. Nonsexual flocculation also occurred when two other ribosomal protein genes,rpl21-2andrpl9-2, were deleted. However, deletion of two nonribosomal protein genes,mpgandfbp, did not cause flocculation. Overall transcript levels ofrpl32inrpl32-1Δ andrpl32-2Δ cells were reduced by 35.9% and 46.9%, respectively, and overall ribosome levels inrpl32-1Δ andrpl32-2Δ cells dropped 31.1% and 27.8%, respectively, compared to wild-type cells. Interestingly, ribosome protein expression levels and ribosome l

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8

Liu, Quan Xiao, Wen Cai Xu, and Jin Li Li. "Application of Cationic Starch Graft Copolymer in Flocculating of Wastewater from Bleaching." Advanced Materials Research 356-360 (October 2011): 1985–89. http://dx.doi.org/10.4028/www.scientific.net/amr.356-360.1985.

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Corn starch, acrylamide and diallyl dimethyl ammonium were used as the raw materials and ammonium persulfate as initiator, cationic starch graft copolymer was prepared, and then the prepared cationic starch graft copolymer is applied to flocculate wastewater from bleaching. The results show that The flocculation of cationic starch graft copolymer to wastewater from increases first and then decreases after the reach of the peak with the increase of the cationic degree of the cationic starch graft copolymer, addition amount, flocculating temperature and flocculating time. When the cationic degre

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9

Zhou, Li Na, Ling Du, and Wen Jie Zhang. "The Effect of KNO₃ on Electrolysis-Assisted Flocculation of Azophloxine Using Polyaluminum Chloride." Applied Mechanics and Materials 707 (December 2014): 3–6. http://dx.doi.org/10.4028/www.scientific.net/amm.707.3.

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Electrolysis-assisted flocculation methods were used in decoloration of azophloxine. Electrolysis-assisted flocculation of azophloxine was conducted under the applied potential using titanium anode. The concentration of KNO3, flocculating time and applied potential were investigated. The application of applied potential has nearly no power to remove the dye from wastewater since the highest decoloration rate is only 2.5% after treatment at KNO3 concentration of 0.6 mol/L. The total flocculating decoloration efficiency decreases gradually after increasing the KNO3 concentration in the solution.

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10

Kurbiel, Jerzy, Adam Sapulak, and Horst Schade. "Application of Pipe Flocculator and Cross-Flow Tilted Plate Settler for Effective Separation of Precipitate from Electroplating Wastewater." Water Science and Technology 21, no. 6-7 (1989): 539–46. http://dx.doi.org/10.2166/wst.1989.0256.

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During a research program, the flocculation and settling of suspended solids in electroplating wastewater were tested. The experimental unit comprised a pipe flocculator and a cross-flow tilted plate settler. The experiment showed high efficiency of the system at short flocculation and settling times: τf = 50 s and τc = 11 min., respectively.

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11

Zhang, Zheng Yuan, Yu Hong Xie, Chen Wang, Yu Xi Ma, Xin Feng, and Yan Hui Ge. "Preliminary Screening of Microorganisms Producing Flocculent." Advanced Materials Research 211-212 (February 2011): 379–83. http://dx.doi.org/10.4028/www.scientific.net/amr.211-212.379.

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In order to reduce the production cost of Microbial Flocculation，this article uses the cheap straw-inorganic nitrogen medium，directly domesticated and screened out a stable and efficient microbial flocculant producing strain B-15，which has better flocculation on kaolin clay suspension system. Preliminary identify as bacillu, the strain produce flocculant has flocculating rate of 81.08% for suspension.

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12

Agarwal, Palak, Vikas K. Sangal, and Sanjay Mathur. "Improving the performance of the electro-coagulation process through efficient flocculation." IOP Conference Series: Earth and Environmental Science 1326, no. 1 (2024): 012133. http://dx.doi.org/10.1088/1755-1315/1326/1/012133.

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Abstract This study combines the Electro-Coagulation (EC) process with flocculation to improve the COD removal efficiency of the simulated textile wastewater without a significant increase in energy consumption. The process of flocculation improves the settleability of the flocs generated at the time of EC. A 3D aluminum electrode with perforations was used for both EC and flocculation. During flocculation, the rotating speed of the anode and detention time were taken as the major operating parameters. The operating conditions at the time of EC were kept fixed for all the runs. The maximum COD

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13

Ji, B., X. Y. Zhang, Z. Li, H. Q. Xie, X. M. Xiao, and G. J. Fan. "Flocculation properties of a bioflocculant produced by Bacillus licheniformis." Water Science and Technology 62, no. 8 (2010): 1907–13. http://dx.doi.org/10.2166/wst.2010.478.

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Studies of the flocculation properties of bioflocculant combined with its structure characterization are helpful to develop more effective bioflocculant. This paper reports findings of our research on the flocculation properties of the bioflocculant ZS-7 in the kaolin suspension based on its structure characterization. With the addition of 2 mg/L ZS-7 and 9 mM CaCl2, the optimum temperature for flocculation performance of ZS-7 in the kaolin suspension is about 30°C, giving the highest flocculating activity 99.2%. Studies of the flocculation properties revealed that it was stable at 60–100°C an

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14

Liu, Xin Liang, Chang Li Ouyang, Yun Xia Bai, Hai Nong Song, and Shuang Fei Wang. "Evaluate the Efficiency of Fenton Oxidation and the Coagulant Aids in Fenton-Flocculation Process." Advanced Materials Research 281 (July 2011): 191–94. http://dx.doi.org/10.4028/www.scientific.net/amr.281.191.

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Fenton-flocculation process as one of effective the advanced oxidation treatments was widely used and studied. In this paper, the efficiency of Fenton oxidation was evaluated by the velocity ratio of CODcr decreased to Fenton reagent consumed. The coagulant aids, PAC and PAM, were canalized by CODcr removal rate, transmittance of the supernatant, the flocculation ratio and sludge settling ratio in Fenton-flocculation process. As the results shown, comparing with flocculation by Fenton reagent, transmittance of the supernatant and flocculating ratio can reach 50% and 80% respectively. The optim

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15

Zulkeflee, Zufarzaana, Ahmad Zaharin Aris, Zulkifli H. Shamsuddin, and Mohd Kamil Yusoff. "Cation Dependence, pH Tolerance, and Dosage Requirement of a Bioflocculant Produced byBacillusspp. UPMB13: Flocculation Performance Optimization through Kaolin Assays." Scientific World Journal 2012 (2012): 1–7. http://dx.doi.org/10.1100/2012/495659.

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A bioflocculant-producing bacterial strain with highly mucoid and ropy colony morphological characteristics identified asBacillusspp. UPMB13 was found to be a potential bioflocculant-producing bacterium. The effect of cation dependency, pH tolerance and dosage requirement on flocculating ability of the strain was determined by flocculation assay with kaolin as the suspended particle. The flocculating activity was measured as optical density and by flocs formation. A synergistic effect was observed with the addition of monovalent and divalent cations, namely, Na+, Ca2+, and Mg2+, while Fe2+and

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16

Yang, Ying, Hongjiang Wang, Bern Klein, and Aixiang Wu. "Shear-Dependent Yield Stress of Iron Ore Fine Tailings in Two-Step Flocculation Process." Advances in Materials Science and Engineering 2020 (November 18, 2020): 1–12. http://dx.doi.org/10.1155/2020/6611392.

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Both shear and flocculation have a significant influence on the rheological behavior of tailings, especially the yield stress. In the two-step flocculation process, the above two kinds of actions exist at the same time, and they influence each other. In order to explore the change rule of the yield stress and its internal causes, a two-step flocculation process of the iron ore fine tailings with different shear conditions in the four different phases was designed. In the primary flocculation phase, tailing particles combined with the primary flocculant and formed a primary floc network structu

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17

Ying Teh, Huey, Uganeeswary Suparmaniam, Man Kee Lam, et al. "Harvesting of Chlorella Vulgaris Biomass by Using Different Bio-Flocculants: A Comparison Study." International Journal of Biomass and Renewables 8, no. 2 (2019): 17. http://dx.doi.org/10.61762/ijbrvol8iss2art5734.

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In the present study, several natural flocculants were extracted from natural resources to harvest Chlorella vulgaris. Jar tests were carried out to evaluate the flocculation efficiencies of the extracted flocculants in harvesting C. vulgaris cells. Chitosan and maize seeds were proven to be effective flocculants as they achieved more than 80 % efficiency after one(1) hour and four (4) hours of sedimentation time, respectively. Under the optimum flocculation conditions of pH 7, 2 mg/L dosage, 120 rpm of stirring speed for chitosan; and pH 3, 450 mg/L of dosage, 15 rpm of stirring speed for mai

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18

Wang, Yan, Xiao Nan Qin, and Wen Jie Zhang. "Electrolysis and Flocculating of Azophloxine Using Polyaluminum Chloride." Advanced Materials Research 1056 (October 2014): 38–41. http://dx.doi.org/10.4028/www.scientific.net/amr.1056.38.

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Electrolysis and flocculation methods were used in decoloration of azophloxine. Electrolysis of azophloxine was conducted under the applied potential using titanium anode. Flocculation of azophloxine was conducted with the help of polyaluminum chloride as flocculating reagent. The solely application of applied potential has nearly no power to remove the dye from wastewater. The efficiency of azophloxine flocculation increases apparently when the amount of PAC is low in the solution. Decoloration rate reaches the maximum value of 57.5% after 15 mg PAC is added into the solution and is stirred f

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19

Ma, Jun, and Guibai Li. "Laboratory and Full-Scale Plant Studies of Permanganate Oxidation as an Aid in Coagulation." Water Science and Technology 27, no. 11 (1993): 47–54. http://dx.doi.org/10.2166/wst.1993.0263.

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Standard jar tests and full-scale plant studies were conducted to evaluate the effectiveness of permanganate preoxidation as an aid to coagulation-flocculation of surface waters. The results of the Jar tests demonstrated that permanganate preoxidation obviously enhanced the coagulation-flocculation of the studied surface waters. Through full-scale plant studies, the positive effects of permanganate assistance in coagulation-flocculation of surface raters were confirmed by the turbidity reduction of about 4~11 FTU at permanganate dosages of 1~2 mg/L. It was observed that the size of flocs in th

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20

Yue, Zhang, Mei Yan Yu, and Wang Hui. "Recovery of Polyvinyl Alcohol Wastewater with Sodium Polyphosphate." Advanced Materials Research 800 (September 2013): 546–49. http://dx.doi.org/10.4028/www.scientific.net/amr.800.546.

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The recovery of polyvinyl alcohol (PVA) by flocculation method is investigated. The sodium polyphosphate is used as flocculating agent. The sodium sulfate produced by the relation between sodium hydroxide and sulfuric acid is used as salting-out agent. The sodium carbonate is used as coagulating agent. The optimal component ratio of flocculating agent, salting-out agent, coagulating agent is obtained by orthogonal experiment. The absorbency of PVA solution is selected as a reference index. PVA content was determined with spectrophotometry. The structure of recovered PVA is analyzed by infrared

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Cerkowniak, Grzegorz R., and Marek Kowalewski. "Transport of Fine Sediments in MarineWaterbodies Near River Mouths: Preliminary Results." Archives of Hydro-Engineering and Environmental Mechanics 65, no. 4 (2018): 255–75. http://dx.doi.org/10.1515/heem-2018-0016.

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AbstractTransport of fine sediments depends mainly on the efficiency of flocculation. Flocculation, understood as the result of simultaneous processes of aggregation of particles and floc break-up, is a common phenomenon in marine environments. It is typical of fine sediments. This study presents a mathematical model of fine sediment transport. A model of flocculation is an important part of this model. Its main assumption is that flocculation is governed by turbulence. The model was qualitatively tested in a simplified theoretical waterbody. Such factors as the wind direction, wind speed, riv

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Ugbenyen, Anthony M., Thandakile A. Madonsela, John J. Simonis, and Albertus K. Basson. "Assessment of the flocculating potentials of Alcaligenes faecalis Isolated from the Estuary of Sodwana Bay." Annals of Science and Technology 3, no. 2 (2018): 1–7. http://dx.doi.org/10.2478/ast-2018-0014.

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AbstractAlcaligenes faecaliswas previously isolated from Sodwana Bay, South Africa and was shown to be a bioflocculant producing microorganism. The bioflocculant production potential was further assessed through the optimization of the standardized culture media. The production of biofloculant as well as the flocculation was evaluated using different variables such as the size of inoculum, sources of carbon and nitrogen, time course and pH. Through optimizationA. faecalisshowed an improvement in the production of its bioflocculant and also flocculating activity for the following factors: flocc

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23

Davlud, D. N., P. D. Vorobiev, D. V. Сherednichenko, et al. "Polyacrylamide flocculants in phase separation processes of mineral ore salt dispersions." Proceedings of the National Academy of Sciences of Belarus, Chemical Series 55, no. 3 (2019): 369–76. http://dx.doi.org/10.29235/1561-8331-2019-55-3-369-376.

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The features of clay-saline (potassium and sodium chlorides) dispersions flocculation using polyacrylamide and its cationic and anionic copolymers are described, including the effect of flocculant concentration, solid concentration in dispersion, method of polymer dissolution in water or saline solution on the sedimentation rate and flocculation density. It is shown that polyacrylamide has the highest flocculating ability towards clay-saline dispersion, and cationic copolymers – the lowest effect. It is shown that in concentrated clay dispersions flocculation starts at lower flocculant dose ra

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Zeng, Fancheng, Liang Xu, Caiyun Sun, Hong Liu, and Libo Chen. "A Novel Bioflocculant from Raoultella planticola Enhances Removal of Copper Ions from Water." Journal of Sensors 2020 (July 23, 2020): 1–10. http://dx.doi.org/10.1155/2020/2581205.

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Copper is one of the most toxic heavy metals. In this work, a sampling survey of copper ions in the water of Songhua River flowing through the chemical and living areas of Jilin City was studied. A new bioflocculant from Raoultella planticola was obtained. The investigation of Songhua River flowing through Jilin City shows that the copper concentration is between 0.07 ppb and 0.16 ppb. The bioflocculant supporting graphite oxide (GO) as a bioflocculant inducer used in this study has been utilized in treatment of copper ions in water. GO and bioflocculant infrared radiation (IR) spectrum and ze

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Zhao, Xiao Fei, De Nan Wu, Chun Xi Ma, Li Xin Liu, Jun Tao Du, and Su Min Liu. "Synthesis of a Novel Cationic Polyacrylamide and Its Application in Flocculation." Advanced Materials Research 311-313 (August 2011): 1124–27. http://dx.doi.org/10.4028/www.scientific.net/amr.311-313.1124.

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In the flocculation treatment of oilfield sewage, cationic polyacrylamide (CPAM), which was synthesized by the copolymerization of dimethyldiallylammonium chloride (DMDAAC), acrylamide(AM), and acrylic acid(AA), will react with the residue of oil displacement agent, causing the quick crimp of its linear-molecular-structure chain and deteriorating the flocculating effects. In order to solve the problem, cationic polyacrylamide (CPAM) was grafted by a cationic-terminated spheroidal-molecular-structure hyperbranched polymer (CHP), which was synthesized by introducing methacryloxyethyl trimethylam

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Sun, Jiao, Shao Hua Cui, Ze Zhan Sun, and Yong Kang. "Numerical Simulation of Flow Fields in Different Baffled Flocculation Reactors." Advanced Materials Research 550-553 (July 2012): 3037–40. http://dx.doi.org/10.4028/www.scientific.net/amr.550-553.3037.

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The flow fields of the flocculators with different baffle which shape is vertical, perforated, arc and sine respectively were numerically simulated. The simulation parameters such as velocity, turbulent intensity, shaft power were compared in different types of baffled reactor. It shows that the calculated flow field matched the experiment results. Compared with the vertical baffles, the other three baffles such as perforated, arc and sine baffles, in varying degrees increased the average velocity and turbulence, and reduce energy consumption, in which the enhancement effects of sine baffles o

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Hu, Zhihao, Kun Wu, Zihan Wang, Kinjal J. Shah, and Yongjun Sun. "Research Progress of Magnetic Flocculation in Water Treatment." Magnetochemistry 10, no. 8 (2024): 56. http://dx.doi.org/10.3390/magnetochemistry10080056.

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As people’s material quality of life continues to improve, water resources become subjected to varying degrees of contamination. As one of the most commonly utilised agents in water treatment, a flocculant exhibits a diverse range of forms and a vast scope of applications. However, the application of flocculants gives rise to a series of issues, including the use of large doses, the formation of sludge, the difficulty of recycling flocculants, and other concerns. The development of new flocculation technology has become a crucial step in enhancing the purification of wastewater and reducing en

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Wang, Dang Wei, Zu Wen Ji, Zhan Di Dong, and Hai Hua Hu. "Mechanism of Sediment Flocs Formation in the Three Gorges Reservoir." Advanced Materials Research 955-959 (June 2014): 2988–95. http://dx.doi.org/10.4028/www.scientific.net/amr.955-959.2988.

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Settling velocity of sediment increases if flocculating occurred, and this enlarges deposition in reservoirs. According to water environmental factors in the Three Gorges reservoir, potential energy and forces between particles are evaluated based on DLVO theory. The critical water dynamics conditions were obtained by comparing extremum in synthetic potential curve and kinetic energy caused by relative velocity between particles. It is found that sediment flocculating is apt to happen when water level is high according to flow dynamics in the Three Gorges reservoir. The flocs are relatively lo

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Matusiak, Jakub, and Elżbieta Grządka. "Stability of colloidal systems - a review of the stability measurements methods." Annales Universitatis Mariae Curie-Sklodowska, sectio AA – Chemia 72, no. 1 (2017): 33. http://dx.doi.org/10.17951/aa.2017.72.1.33.

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<p>The stability of colloidal systems is very important in numerous already existing and new formulations. In most cases if such systems are not characterized by an appropriate stability they can not find any useful applications. The opposite process to the stabilization is the flocculation. Generally, it is undesirable. However, in a few cases the flocculation is very useful, for example in the wastewater treatment. That is why the methods used to determine stabilizing-flocculating properties of the colloidal systems are of significant importance.</p><p>The paper describes t

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Luna, Christine Lamenha, Carlos Edison Lopes, and Giulio Massarani. "Recovery of Bacillus sphaericus spores by flocculation/sedimentation and flotation." Brazilian Archives of Biology and Technology 48, spe (2005): 61–70. http://dx.doi.org/10.1590/s1516-89132005000400008.

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The aim of this work was use flocculation/sedimentation and flotation for recovery of spores of the Bacillus sphaericus. Microorganism was produced batchwise using culture medium based skimmed milk, corn steep liquor and mineral salts. The best results of flocculation were obtained using CaCl2.2H2O, FeCl3.6H2O, Al2(SO4)3 and tannin as flocculating agents, with optimal flocculation concentrations of 1,500, 3,000, 2,000 and 1,700ppm, respectively. Flocculent suspensions were characterized based on floc diameter and density. Settling tests were performed in batch at different concentrations of th

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Wen, Liang, and Duoxi Yao. "The Effect of Flocculants and Water Content on the Separation of Water from Dredged Sediment." Water 15, no. 13 (2023): 2462. http://dx.doi.org/10.3390/w15132462.

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Dredged sediment has high water content, and its engineering characteristics are poor; therefore, the treatment and disposal of dredged sediment is difficult, and the utilization efficiency of these resources is low. Various methods can be used to dehydrate dredged sediment, among which flocculation dewatering is the most widely used. In this study, the basic properties of dredged sediment were examined, and the flocculation dehydration effect of dredged sediment was analyzed in relation to the polyaluminum ferric chloride (PAFC) dosage, water content, and time. There is an optimal flocculant

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Mu, Jun, Yuxia Wang, Xia Cui, and Qiao Yang. "Ubiquitous flocculation activity and flocculation production basis of the conglutination mud from Ruditapes philippinarum along the coast of China." PLOS ONE 16, no. 11 (2021): e0256013. http://dx.doi.org/10.1371/journal.pone.0256013.

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Ruditapes philippinarum conglutination mud (RPM) is a typical waste by-product from manila clam R. philippinarum aquaculture. However, RPM from the clam at an aquaculture farm in Zhoushan, China, has been newly reported as a promising natural bioflocculant resource that contains effective flocculating polysaccharides from the clam associated bacteria. With an intent to figure out whether RPM flocculation activity is ubiquitous to the manila clam across a wide geographical range or only the Zhoushan location, and to explore the flocculation production basis and ultimately widen its exploitation

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Xu, Yan, Kemin Gan, Siyi Liang, Haitao Liu, and Qunhui Wang. "Investigation and Optimization of Chitosan Performance in Flocculating Kaolin Suspensions Using a Real-Time Suspending Solid Concentration Measuring Method." Water 13, no. 4 (2021): 513. http://dx.doi.org/10.3390/w13040513.

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Abstract (sommario):

The performance of chitosan in flocculating kaolin suspensions was investigated. A real-time suspended solid (SS) concentration measuring method was applied. The influence of pH was examined from 2.0 to 13.0. The optimal pH value for low-grade (100 mg/L), middle-grade (500 mg/L), and high-grade (1000 mg/L) kaolin suspension samples was 8.0. The optimal dosage of chitosan for the three grades of kaolin suspensions was 5.0 mg/L, regardless of the initial SS concentration. An orthogonal array test was performed to determine the optimal hydraulic conditions. Range analysis and variance analysis sh

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34

Yan, Xiaoqian, and Xunjiang Zhang. "Interactive effects of clay and polyacrylamide properties on flocculation of pure and subsoil clays." Soil Research 52, no. 7 (2014): 727. http://dx.doi.org/10.1071/sr14106.

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Abstract (sommario):

Turbidity reduction is essential for improving surface water quality. Eroded fine sediments not only increase surface water turbidity, they also carry pollutants such as heavy metals and pathogens. The objectives of this study were to investigate the mechanisms of adsorption and desorption of polyacrylamide (PAM) by pure kaolinite and montmorillonite, and to test the ability of PAM to flocculate the two pure clays as well as four subsoils having distinct clay mineralogy. PAMs with different charge type, density, and molecular weights were used, and a standard flocculation series test and an is

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35

Ndejiko, Jibrin Mohammed, and Wan Rosmiza Zana Wan Dagang. "Flocculation behaviour of bioflocculant produced from chicken viscera." E3S Web of Conferences 90 (2019): 01013. http://dx.doi.org/10.1051/e3sconf/20199001013.

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Abstract (sommario):

The flocculation performance of bioflocculant produced by Aspergillus flavus S44-1 grown on chicken viscera hydrolysate was investigated. The investigations were carried out using jar testing and kaolin clay suspension as model wastewater. The bioflocculant yielded a minimum of 83.1% efficiency in flocculating 2-12 g L-1 kaolin clay suspension over a wide temperature range (4-80 °C) and functioned maximally at neutral pH. The bioflocculant significantly flocculated different suspended particles such as activated carbon (92%), soil solid (94.8%), and algae (69.4%) at varying concentrations. Bri

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36

Tian, Jing Wen, and Mei Juan Gao. "Intelligent Control of Flocculation Process Based on Radial Basis Probabilistic Neural Network for Sewage Treatment." Applied Mechanics and Materials 44-47 (December 2010): 3289–93. http://dx.doi.org/10.4028/www.scientific.net/amm.44-47.3289.

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Abstract (sommario):

The flocculating process of sewage treatment is a complicated and nonlinear system, and it is very difficult to found the process model to describe it. The radial basis probabilistic neural network (RBPNN) has the ability of strong function approach and fast convergence. In this paper, an intelligent optimized control system based on radial basis probabilistic neural network is presented. We constructed the structure of radial basis probabilistic neural network that used for controlling the flocculation process, and adopt the K-Nearest Neighbor algorithm and least square method to train the ne

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37

Godek, Ewelina, Elżbieta Grządka, Urszula Maciołek, and Anna Bastrzyk. "Influence of Zwitterionic CAPB on Flocculation of the Aqueous Cationic Guar Gum/Glauconite Suspensions at Various pH." International Journal of Molecular Sciences 22, no. 22 (2021): 12157. http://dx.doi.org/10.3390/ijms222212157.

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Abstract (sommario):

The influence of the pseudoamphoteric zwitterionic surfactant cocamidopropylbetaine (CAPB) on the stabilizing flocculating properties of the aqueous suspensions of glauconite (GT) with cationic guar gum (CGG) at various pH values was investigated. The following techniques were used: turbidimetry, UV-VIS spectrophotometry, tensiometry, electrophoretic mobility measurements, SEM, CHN, XRD, and FT-IR. It was established that CGG is an effective glauconite flocculant. Moreover, the most probable mechanism that is responsible for flocculation is bridge flocculation resulting from polymer adsorption

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38

Fujisaki, Kazuhiro. "Comparison of Flocculation Properties with Use of a New Flocculation Tester." Modern Environmental Science and Engineering 1, no. 6 (2016): 304–10. http://dx.doi.org/10.15341/mese(2333-2581)/06.01.2015/004.

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39

Zhu, Yanbin, Shan Li, Dengxin Li, Chunyan Liu, and Fang Ma. "Bioflocculation behaviours of microbial communities in water treatment." Water Science and Technology 69, no. 4 (2013): 694–702. http://dx.doi.org/10.2166/wst.2013.746.

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Abstract (sommario):

We studied the flocculation behaviours of microbial communities in 21 soil, wastewater and activated sludge samples to clarify the effects of culture medium types on flocculation ability and screening efficiency, and to analyze diverse functions and microbial compositions. The bioflocculants produced by 33% of the microbial communities had flocculating efficiencies higher than 90%. Six out of the eight microbial communities with efficiencies over 94% were screened from the culture medium using dibutyl phthalate (DBP) as the carbon source. BF-BCT, which was derived from the Chinese cabbage soil

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40

Ugbenyen, Anthony M., John J. Simonis, and Albertus K. Basson. "Screening for Bioflocculant-Producing Bacteria from the Marine Environment of Sodwana Bay, South Africa." Annals of Science and Technology 3, no. 1 (2018): 16–20. http://dx.doi.org/10.2478/ast-2018-0010.

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Abstract (sommario):

AbstractFlocculants are chemicals that mediate flocculation process, by aggregating colloids from suspension to form floc. Chemical flocculants are hazardous to the environment, which inform the search for safer and eco-friendly alternatives from microorganisms. Bacterial strains were isolated from water and sediment samples collected from Sodwana Bay, South Africa, and physiological properties of the bacterial strains were observed. Flocculation test using kaolin clay suspension was done on all isolates and the ones that showed flocculating activity were identified molecularly using 16 rRNA g

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41

Wan, Ying Xin, Lei Shi, Li Ping Wu, and Pei Jing Tang. "Screening for the Strain Galactomyces sp. Producing Bioflocculant by UV Mutagenesis." Applied Mechanics and Materials 325-326 (June 2013): 102–5. http://dx.doi.org/10.4028/www.scientific.net/amm.325-326.102.

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Abstract (sommario):

Strain Galactomyces sp. M-2 from activated sludge was used as parent strain and then UV mutation breeding was performed. Finally we obtained a quality strain UVM8 suitable for the production of bioflocculant which flocculating activity is 92.8%. It showed there is excellent stable flocculating activity for stain UVM8 in the flocculating stability experiment. Further studies showed the best flocculation effect was obtained when C/N ration is 20:2 and pH is 8 in the initial culture medium.

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42

Liu, Ya, Cuicui Lv, Jian Ding, et al. "Characterization of a hybrid polyacrylamide and its flocculation properties in cyanide tailing suspensions." Water Science and Technology 76, no. 9 (2017): 2482–93. http://dx.doi.org/10.2166/wst.2017.422.

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Abstract (sommario):

Abstract An inorganic-organic hybrid flocculant Al(OH)3-polyacrylamide (Al-PAM) with narrow molecular weight distribution was synthesized using inverse microemulsion polymerization. The hybrid polymer Al-PAM was characterized by Infrared spectroscopy, thermogravimetric analysis, transmission electron microscopy and scanning electron microscopy, and it was found that it had a ‘star-like’ structure in which Al(OH)3 colloidal particles acted as cores linking PAM chains. The properties of Al-PAM were investigated in flocculating 10 wt% cyanide tailing suspensions. It was found that as the amount o

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43

Chen, Xiaoquan, Wenhao Shen, Shunli Kou, and Huanbin Liu. "GC-MS study of the removal of dissolved and colloidal substances in recycled papermaking by flocculation with nano-size TiO2 colloids." BioResources 6, no. 3 (2011): 3300–3312. http://dx.doi.org/10.15376/biores.6.3.3300-3312.

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Abstract (sommario):

In the papermaking process, the removal and control of dissolved and colloidal substances (DCS) is a key issue for reducing the usage of fresh water. Nano-size TiO2 is an excellent capturing and flocculating agent for DCS due to its large surface area and positive charge. The composition of dissolved and colloidal substances in a system and the removal of these substances by flocculation with nano-size TiO2 colloids were determined by gas chromatography and mass spectrometry (GC-MS). The samples were obtained from non-deinked pulp (non-DIP), deinked pulp (DIP), and whitewater. The research res

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44

Huang, Haolin, Jingsong Li, Weiyi Tao, and Shuang Li. "A Functionalized Polysaccharide from Sphingomonas sp. HL-1 for High-Performance Flocculation." Polymers 15, no. 1 (2022): 56. http://dx.doi.org/10.3390/polym15010056.

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Abstract (sommario):

The characterization and flocculation mechanism of a biopolymer flocculant produced by Sphingomonas sp., HL-1, were investigated. The bio-flocculant HL1 was identified as an acidic polysaccharide, mainly composed of glucose, and also contained a small amount of mannose, galacturonic acid and guluronic acid. The flocculating activity of the purified HL1 polysaccharide could be activated by trivalent cations, and its flocculation mechanism was mainly charge neutralization and bridging. The working concentration of fermentation broth HL1 in a kaolin suspension was only 1/10,000 (v/v), in which th

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45

Su, Zhenhua, Shujie Fan, Chen Gong, et al. "Incineration Properties and Kinetic Studies of Sludge from Old Newsprint Fiber Line." BioResources 17, no. 2 (2022): 3095–106. http://dx.doi.org/10.15376/biores.17.2.3095-3106.

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Abstract (sommario):

The basic incineration properties of flotation deinking sludge and two kinds of flocculating sludge from old newsprint fiber line were studied. Coats-Redfern was used for incineration process analysis, and based on the kinetic parameters of the three types of studied sludge at a heating rate of 10 °C·min-1, the reaction orders were confirmed in the organic incineration region. The activation energy of the three sludge types were 38.78, 44.59, and 48.11 kJ·mol-1, and their frequency factors were 2.58 E+07 min-1, 3.19 E+06 min-1, and 1.50 E+06 min-1, respectively. Organics incineration in the fl

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46

Touhami, Ahmed, Barbara Hoffmann, Andrea Vasella, Frédéric A. Denis, and Yves F. Dufrêne. "Aggregation of yeast cells: direct measurement of discrete lectin–carbohydrate interactions." Microbiology 149, no. 10 (2003): 2873–78. http://dx.doi.org/10.1099/mic.0.26431-0.

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Abstract (sommario):

Aggregation of microbial cells mediated by specific interactions plays a pivotal role in the natural environment, in medicine and in biotechnological processes. Here we used atomic force microscopy (AFM) to measure individual lectin–carbohydrate interactions involved in the flocculation of yeast cells, an aggregation event of crucial importance in fermentation technology. AFM probes functionalized with oligoglucose carbohydrates were used to record force-distance curves on living yeast cells at a rate of 0·5 μm s−1. Flocculating cells showed adhesion forces of 121±53 pN, reflecting the specifi

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47

Zhang, Liang, Guangli Cao, He Liu, et al. "Application of Aspergillus niger in Practical Biotechnology of Industrial Recovery of Potato Starch By-Products and Its Flocculation Characteristics." Microorganisms 10, no. 9 (2022): 1847. http://dx.doi.org/10.3390/microorganisms10091847.

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Abstract (sommario):

This study developed a practical recovery for potato starch by-products by A. niger and applied it on a plant scale to completely solve the pollution problems. Soughing to evaluate the effect of A. niger applied towards the production of by-products recycling and analyze the composition and characteristics of flocculating substances (FS) by A. niger and advance a possible flocculation mechanism for by-product conversion. After fermentation, the chemical oxygen demand (COD) removal rate, and the conversion rates of cellulose, hemicellulose, pectin, and proteins were 58.85%, 40.19%, 53.29%, 50.1

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48

Murad, Fatin Nabilah. "OPTIMIZATION OF FLOCCULATION PROCESS BY MICROBIAL COAGULANT IN RIVER WATER." IIUM Engineering Journal 18, no. 2 (2017): 63–70. http://dx.doi.org/10.31436/iiumej.v18i2.740.

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Abstract (sommario):

The existing process of coagulation and flocculation are using chemicals that known as cationic coagulant such as alum, ferric sulfate, calcium oxide, and organic polymers.Â Thus, this study concentrates on optimizing of flocculation process by microbial coagulant in river water. Turbidity and suspended solids are the main constraints of river water quality in Malaysia. Hence, a study is proposed to produce microbial coagulants isolated locally for river water treatment. The chosen microbe used as the bioflocculant producer is Aspergillus niger. The parameters to optimization in the flocculati

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49

Murguly, Zsófia, and Ildikó Bodnár. "Investigation of the Application of Coagulants in Case of Domestic Greywater Fraction." Acta Materialia Transylvanica 5, no. 1 (2022): 23–28. http://dx.doi.org/10.33924/amt-2022-01-06.

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Abstract (sommario):

Abstract During our research work, we examined the removal of contaminants from synthetically produced bathing waters using different coagulants and studied the efficiency and the mechanism of coagulation-flocculation processes in detail. In our work, we performed experiments with two different types of coagulants (iron(III) chloride and polyelectrolyte) and compared their efficiencies. The zeta potential and its change were monitored as a qualifying parameter while other water quality parameters were also analyzed. In our experiments, a newly acquired flocculator device was also used to study

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50

Ngo, H. H., S. Vigneswaran, and V. Jegatheesan. "Mathematical modelling of downflow floating medium filter (DFF) with in-line flocculation arrangement." Water Science and Technology 34, no. 3-4 (1996): 355–62. http://dx.doi.org/10.2166/wst.1996.0451.

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Abstract (sommario):

A laboratory-scale set-up consisting of rapid mixing device and floating medium filter was used to study the use of a downflow floating medium filter (DFF) with an in-line flocculation arrangement as a static flocculator and a prefilter. The semi-empirical mathematical model formulated incorporates flocculation within the filter, particle/floc attachment onto the filter and the detachment of flocs from the medium. The mathematical model for filtration takes into account the expansion of the filter bed. The removal efficiency of DFF and headloss development were successfully simulated for diffe

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