Evaluation and optimization of enhanced coagulation process: Water and energy nexus

Sun, Yongjun; Zhou, Shouyong; Chiang, Pen‐Chi; Shah, Kinjal J.

doi:10.1016/j.wen.2020.01.001

Cited by 112 publications

(71 citation statements)

References 98 publications

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“…This process is carried out to increase the sedimentation rate and fully remove the disinfection byproduct. It can be achieved by using excess of coagulant, combination of coagulants or other additional agents (e.g., oxidant and activated carbon), adjusting pH, and controlling of hydraulic condition [ 44 , 45 , 46 ]. In addition, the sludge production is reduced and simultaneously the water treatment cost is lowered in enhanced coagulation.…”

Section: Flocculation Mechanismmentioning

confidence: 99%

Recent Achievements in Polymer Bio-Based Flocculants for Water Treatment

2020

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Polymer flocculants are used to promote solid–liquid separation processes in potable water and wastewater treatment. Recently, bio-based flocculants have received a lot of attention due to their superior advantages over conventional synthetic polymers or inorganic agents. Among natural polymers, polysaccharides show many benefits such as biodegradability, non-toxicity, ability to undergo different chemical modifications, and wide accessibility from renewable sources. The following article provides an overview of bio-based flocculants and their potential application in water treatment, which may be an indication to look for safer alternatives compared to synthetic polymers. Based on the recent literature, a new approach in searching for biopolymer flocculants sources, flocculation mechanisms, test methods, and factors affecting this process are presented. Particular attention is paid to flocculants based on starch, cellulose, chitosan, and their derivatives because they are low-cost and ecological materials, accepted in industrial practice. New trends in water treatment technology, including biosynthetic polymers, nanobioflocculants, and stimulant-responsive flocculants are also considered.

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Section: Flocculation Mechanismmentioning

confidence: 99%

Recent Achievements in Polymer Bio-Based Flocculants for Water Treatment

2020

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“…Coagulation process is a simple and economic wastewater treatment technology, recommended for domestic and industrial wastewater, in the primary purification treatment [1,2]. In general, both coagulation and flocculation are used in the treatment process [3].…”

Section: Introductionmentioning

confidence: 99%

New Materials Synthesized by Sulfuric Acid Attack Over Power Plant Fly Ash

Forminte¹,

Ciobanu²,

Buema³

et al. 2020

Rev. Chim.

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In the current work, the preparation of a complex wastewater coagulant based on polymeric sulfates of aluminum/iron from fly ash is presented. The performance of the coagulation�flocculation process is mostly influenced by the coagulant type, which enhances the aggregation of particles and leads to formation of fast-settling flocs by charge neutralization or chain-bridging mechanisms. Within the preparation process, the reaction temperature was controlled at 80�C and 90�C for 4 h, the synthesized materials being characterized through different techniques (SEM, EDAX, FTIR, and XRD) and further used as coagulants for real wastewater treatment. As a novelty of this study, it can be mentioned that there were analyzed the possibilities of capitalization of Romanian fly ash collected from Iasi area and its transformation into complex based on aluminum - iron sulfates. Fly ash containing different concentrations of Fe2O3 and Al2O3 was successfully used in producing complex coagulants by reacting with 10% technical sulfuric acid solution. The produced complex coagulants contain both polymeric ferric sulfate (PFS) and polymeric aluminum sulfate (PAS) (demonstrated by complex characterization) and proved to be effective in wastewater treatment. These sustainable materials exhibited a good performance in coagulation�flocculation process (e.g. it was obtained a TSS removal efficiency of 84% at the coagulant dosage of 60 mg/L).

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“…They are efficient bio-templates due to their high catalytic activity, ease of handling, reusability, and benign character [ 32 , 33 , 34 ]. Ferromagnetite can be used as a coagulant in wastewater treatment due to its superparamagnetic properties that can influence the stability and adsorption capacity of the contaminants from wastewater [ 27 , 35 ]. According to Tetteh and Rathilal [ 7 ], the incorporation of ferromagnetite with alum improved the alum cluster content, inter-layer structures, surface area, and pore size, enhancing the wastewater treatability performance.…”

Section: Introductionmentioning

confidence: 99%

Coagulation Treatment of Wastewater: Kinetics and Natural Coagulant Evaluation

2021

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In this study, three coagulants (ferromagnetite (F), alum (A), and eggshells (E)) and their hybrids (FA, FE, and FEA) were investigated as possible cost-effective coagulants for the treatment of industrial wastewater. Scanning electron microscopy (SEM) coupled with energy-dispersive X-ray (EDX) was used to characterize the morphological and elemental compositions of the coagulants. The effects of coagulant dosage (10–60 mg/L) and settling time were investigated for the removal of turbidity, color, and total suspended solids. A jar tester (JTL6) operating at conditions of 150 rpm for 2 min (rapid mixing) and 30 rpm for 15 min (slow mixing) was employed. Results from the characterized supernatant showed about 80% removal of the contaminants. The prospects of F were proven to be the most effective as compared to the binary (FA > FE) and the ternary hybridized (FEA) coagulants. At an optimum dosage and settling time of 20 mg/L and 30 min, respectively, the treatability performance of F was clearly proven to be viable for wastewater treatment.

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Evaluation and optimization of enhanced coagulation process: Water and energy nexus

Cited by 112 publications

References 98 publications

Recent Achievements in Polymer Bio-Based Flocculants for Water Treatment

Recent Achievements in Polymer Bio-Based Flocculants for Water Treatment

New Materials Synthesized by Sulfuric Acid Attack Over Power Plant Fly Ash

Coagulation Treatment of Wastewater: Kinetics and Natural Coagulant Evaluation

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