Novel chitosan-based flocculants for chromium and nickle removal in wastewater via integrated chelation and flocculation

Sun, Yongjun; Chen, Aowen; Pan, Shu-Yuan; Sun, Weibang; Zhu, Chengyu; Shah, Kinjal J.; Zheng, Huaili

doi:10.1016/j.jenvman.2019.07.012

Cited by 70 publications

(14 citation statements)

References 59 publications

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“…Another proposition by Sun et al [ 94 ] was chitosan-based copolymers with xanthate and sulfonic acid group. This agent, also obtained in photochemical reaction of carboxylated chitosan, proved to be very effective in purifying water from heavy metal ions such Cr and Ni (total removal efficiency in both cases exceeds 99%).…”

Section: Bio-based Polysaccharide Flocculants For Water Treatmentmentioning

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: Bio-based Polysaccharide Flocculants For Water Treatmentmentioning

confidence: 99%

Recent Achievements in Polymer Bio-Based Flocculants for Water Treatment

2020

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“…Accordingly, it is vital to determine the flocculants’ effectiveness and their effect on water quality. Recently, some scientific works have focused on using polysaccharides as eco-friendly materials to improve the coagulation/flocculation processes [ 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 ]. An excellent example may be chitosan and starch, renewable polymers of proven biocompatibility and non-toxicity [ 22 ].…”

Section: Introductionmentioning

confidence: 99%

The Use of Chitosan and Starch-Based Flocculants for Filter Backwash Water Treatment

et al. 2022

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Inorganic aluminum or iron salts supported with synthetic polymers are commonly used to eradicate colloidal particles from water in coagulation and flocculation processes. Nevertheless, these agents have several disadvantages, such as large volumes of sludge produced or environmental toxicity. Recently biodegradable polymers have been suggested as eco-friendly flocculants for water treatment. This study aimed to investigate the possibilities of using starch and chitosan and their oxidized derivatives as flocculants for filter backwash water treatment. Dialdehyde starch (DST) and dialdehyde chitosan (DCT) were synthesized by periodate oxidization of natural starch from corn and low molecular weight chitosan. The obtained materials have been characterized with scanning electron microscopy (SEM), ATR-FTIR spectroscopy, and thermogravimetric analysis (TGA). Furthermore, we studied the flocculation properties of polysaccharide flocculants in a series of jar tests. The effectiveness of chitosan and starched-based flocculants was compared to synthetic polymers commonly used to treat iron ions-rich filter backwash water. The environmental aspects of these chemicals, particularly the biodegradability of post-flocculation residues, were also addressed. It was found that oxidized starch and chitosan derivatives can be used as ecological flocculating materials to treat potable water or sludge.

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“…Moreover, PAM contained the reactive groups in its polymer chains which provided the favorable adsorption sites for tiny flocs of CuO. Thus, the removal of nano-CuO by PAM mainly occurs via the adsorption bridging mechanism [ 34 ]. These observations are consistent with the literature [ 35 ], which reported similar turbidity removal rates of the kaolinite−humic acid solution using PAFC and PAM−PAFC.…”

Section: Resultsmentioning

confidence: 99%

Synergetic Effect of Organic Flocculant and Montmorillonite Clay on the Removal of Nano-CuO by Coagulation-Flocculation-Sedimentation Process

et al. 2021

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The widespread usage of nano-copper oxide particles (nano-CuO) in several industrial products and applications raises concerns about their release into water bodies. Thus, their elimination from drinking water is essential to reduce the risk to human health. This work investigated the removal of nano-CuO from pure water and montmorillonite clay (MC) suspensions using poly aluminum ferric chloride (PAFC) as well as cationic polyacrylamide (PAM) by the coagulation-flocculation-sedimentation (C/F/S) process. Moreover, the PAFC and PAFC/PAM flocculation performance for various nano-CuO particles concentrations, dosages, pH, settling times and stirring speeds were also investigated. The findings showed that the removal of nano-CuO and turbidity in MC suspension were higher as compared to pure water. Moreover, the combined effect of PAFC/PAM on the elimination of nano-CuO and turbidity was also substantially better than the individual use of PAFC or PAM. The efficient removal of CuO was observed in the solution containing higher mass concentration in the order (10 mg/L > 2.5 mg/L > 1 mg/L) with an increased coagulant dose. The improved removal performance of nano-CuO was observed in a pH range of 7–11 under various water matrices. The C/F/S conditions of nano-CuO were further optimized by the Box–Behnken statistical experiment design and response surface methodology. The PAFC/PAM dose resulted in the maximum removal of nano-CuO (10 mg/L) in both pure water (>97%) and MC suspension (>99%). The results of particle monitoring and Fourier transform infrared of composite flocs revealed that the main removal mechanism of nano-CuO may be the combined effect of neutralization, complexation as well as adsorption.

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Novel chitosan-based flocculants for chromium and nickle removal in wastewater via integrated chelation and flocculation

Cited by 70 publications

References 59 publications

Recent Achievements in Polymer Bio-Based Flocculants for Water Treatment

Recent Achievements in Polymer Bio-Based Flocculants for Water Treatment

The Use of Chitosan and Starch-Based Flocculants for Filter Backwash Water Treatment

Synergetic Effect of Organic Flocculant and Montmorillonite Clay on the Removal of Nano-CuO by Coagulation-Flocculation-Sedimentation Process

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