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bentonite addition level must be optimised for further ... DDJ resulted in observed which would lead to a 'patchy' the entire amount of water in the ... without CPAM and bentonite flocculants ...
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Using cationic polymer flocculants has a high flocculation effect on bentonite. However, the flocculation mechanism is unclear. ... An amount of 100 ... bentonite. In addition, ...
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Flocculation of bentonite suspensions by bioflocculant produced by the cyanobacterium Phormidium species strain J1 was correlated with the adsorption mechanism of the flocculant on the bentonite particles in the presence of various CaCl 2 concentrations. The optimal flocculant concentration decreased with an increase in CaCl 2 concentration, and the …
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Many previous attempts of activation of Ca-bentonite were not feasible, upgrading required addition of many extra additives or sometimes mixed with commercial Na-bentonite toimprove its properties.
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From this study, it can be concluded that the role of CaC12 is to increase the amount of adsorbed flocculant on the bentonite particles, at any given flocculant concentration. …
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Recent work has explored the effect of ionic strength and ionic strength history on the flocculation of bentonite using cationic polyacrylamide, examining both flocculation performance and internal floc structure using confocal microscopy [10], [11].It was observed that increasing NaCl concentration drastically reduced optimal polymer dosing levels, and changed …
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Acid mine drainage was collected from the western decant in Krugersdorp, South Africa, to conduct a series of laboratory tests using 200 mL of AMD in five beakers dosed with …
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To improve the dewatering performances of the waste slurry, a new Fe-Polyacrylamide (Fe-PAM) flocculant was synthesized. Comparative analysis with various ionic forms of polyacrylamide (PAM) reveals that the Fe-PAM flocculant has the shortest flocculation time, the lowest optimal shear gradient for flocculation, and the best filtration performance.The …
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The addition of bentonite effectively promoted the coagulation–flocculation effect. Overall, this work demonstrates that bentonite significantly improves coagulation–flocculation treatment and …
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The main objective of this project was to evaluate the potential benefits of a bentonite-derived product as an in-situ settling and flocculation improvement options and to quantify the benefits in terms of additional secondary clarifier …
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The optimum preparation process of flocculant BTA has shown 29.5% acid bentonite part, 29.5% alkaline bentonite part, 15% PAC, 1% CPAM, 5% ferrous sulfate, and 20% aluminum sulfate. BTA was used...
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It was found that the removal of the dyes increased with addition of SA as the flocculant/coagulant aid. Bentonite as a natural coagulant aided by the biodegradable flocculant, SA, is an effective combination for removal of basic dyes (color removal). ... The waste water from the textile dyeing industry pr oduces large amount of coloured water ...
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In the second trial, which involved the use of alum with chitosan and bentonite, the doses of aluminum sulfate and chitosan were maintained at 10 mg/L, while the bentonite dose was adjusted from 30 mg/L to 250 mg/L. Various parameters were analyzed to determine the optimal conditions for each parameter when using coagulant and flocculant ...
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The effect of polyacrylamide (PAM) as flocculant, NaCl electrolyte concentration and pH on the degree of flocculation of bentonite suspension has been investigated.
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The two kinetic parameters of this equation, Vo and K, were determined in the field using batch column settling tests with and without the addition of a flocculant aid. - Determination of the sludge volume index (SVI) with and without the flocculant aid. - Jar testing to determine the flocculation kinetics of the MLSS with and without flocculant.
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PDF | On Jan 1, 2018, Ayano Nakamura and others published The Aggregation of Bentonite Using Poly(N-isopropylacrylamide) as a Flocculant | Find, read and cite all the research you need on ResearchGate
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In presence of flocculant addition in 1:1 concentration ratio between extracted chitosan and natural bentonite clay, the surface charge (in terms of conductivity) was the maximum (at 2,260 μS/cm) on the flocs or aggregates formed possibly due to adsorption of algal cells on to the larger surface area made available by fine particles of ...
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Sedimentation tests of bentonite suspension were carried out by adding various concentrations of poly(N-isopropylacrylamide) (PNIPAM) with different molecular weights as flocculant below and above lower critical …
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The sulfur-free clarification process of sugarcane juice by bentonite method as claimed in claim 1, characterized in that: in the secondary adsorption and decoloration process, the addition amount of the chitosan/bentonite compound is calculated according to the addition amount of 0.002g to 0.02g of the chitosan/bentonite compound in 1mL of ...
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Download Citation | Effects of polyacrylamide addition and dosage on the effectiveness of sludge-recycling enhanced flocculation | The dosage effect of polyacrylamide (PAM) with long-chain ...
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Chitosans with different degrees of deacetylation (DD) and molecular weights (M w) were tested for the flocculation of bentonite suspensions prepared with demineralized water (DW) and tap water (TW), respectively.Flocculation kinetics model of particles collisions combining zeta potential and turbidity measurements was employed to investigate the effects of the DD and M …
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In this study, the sedimentation behavior of bentonite (Na and Ca bentonite) suspensions with different swelling potentials was investigated with single and combined coagulation and flocculation ...
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In addition, the state of the bentonite aggregates was observed to investigate its association with the sedimentation rate. ... Relationship between the amount of flocculant adsorbed on the bentonite aggregates and the concentration of flocculant added to the bentonite suspension. ... the bentonite amount in the supernatant solution at pH10 was ...
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minutes, before the addition of coagulant and flocculant, the adsorption capacity is 0.89 mg NH 4 ... followed by the addition of the same amount of bentonite to each. Contact time of ammonium ion ...
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Discover the impact of poly(N-isopropylacrylamide) on bentonite sedimentation. Explore the effects of concentration and molecular weight on aggregation mechanisms. Find out how PNIPAM acts as a powerful flocculant, with larger …
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Second, addition of flocculants (for example, high molecular weight organic polymers) is subsequently performed to allow for formation of larger and heavier flocs that can be preferentially ...
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The optimum dosage of a flocculant or a coagulant reflects the amount that achieves the maximum treatment with minimum amount of chemicals. This ensures the best performance with the lowest possible cost. Ideally, a turbid system tends to decrease in turbidity upon addition of coagulant dosages at the beginning, until the optimum dosage is reached.
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At a contact time of 2 minutes, before the addition of coagulant and flocculant, the adsorption capacity is 0.89 mg NH 4 + /g, while at a contact time of 10 minutes, the adsorption capacity is 1. ...
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Abstract. Sedimentation tests of bentonite suspension were carried out by adding various concentrations of poly(N-isopropylacrylamide) (PNIPAM) with different molecular weights as flocculant below and above lower critical solution …
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where T 0 is the turbidity of the initial wastewater at time zero, and T f is the turbidity of the supernatant of the treated sample at a given time. In some cases, values of turbidity removal lower than zero were obtained. This is because just after addition of bentonite turbidity usually increases, and, if the settling of the particles is poor, even after further addition …
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