Abstract
The ampholytic chitosan based flocculant carboxylated chitosan graft-(3-chloro-2-hydroxypropyl) trimethylammonium chloride-dimethyl diallyl ammonium chloride (CPCTS-g-P (CTA-DMDAAC)) was synthesized by photo polymerization using carboxylated chitosan (CPCTS), 3-chloro-2-chloropropyltrimethylammonium chloride (CTA) and dimethyldiallylammonium chloride (DMDAAC) as the cationic co-monomers. The effects of monomer concentration, the ratio of CPCTS and cationic monomers, cationic degree, initiator time, photoinitiator concentration, and pH value on the properties of CPCTS-g-P (CTA-DMDAAC) were studied. The microcystis aeruginosa that was cultured in laboratory was used for CPCTS-g-P (CTA-DMDAAC) flocculation tests. The effects of CPCTS-g-P (CTA-DMDAAC) dosage, pH value and G value on flocculation performance were investigated. The maximum removal rate of chlorophyll-a (Chl-a) and chemical oxygen demand (COD) that were obtained by CPCTS-g-P (CTA-DMDAAC) were 98.8% and 96.5% under the conditions of dosage 4 mg/L, pH 7 and G value 200 s−1, respectively. The flocculation experiments showed that chitosan-based flocculant CPCTS-g-P (CTA-DMDAAC) had better flocculation performance than commercially available flocculants cationic polyacrylamide (CPAM), Polyferric Sulfate (PFS), and polymeric aluminium (PAC).
Highlights
Eutrophication usually refers to a large amount of nutrients, such as nitrogen and phosphorus, which are needed by organisms; these nutrients are usually discharged into relatively closed water bodies and lakes [1]
When the monomer concentration was more than 25%, the intrinsic viscosity of CPCTS-g-P (CTA-dimethyldiallylammonium chloride (DMDAAC)) decreased rapidly
The ampholytic flocculant CPCTS‐g‐P (CTA‐DMDAAC) was synthesized, and its flocculation performance was verified by the investigation of algal removal
Summary
Eutrophication usually refers to a large amount of nutrients, such as nitrogen and phosphorus, which are needed by organisms; these nutrients are usually discharged into relatively closed water bodies and lakes [1]. The nutrient substance in the water causes rapid growth of algae, which in turn, has a serious impact on water quality [2]. Algae cells were characterized by complex types, large amounts, small specific gravity, high negative charge and high stability [3]. Algae in water has adversely affected drinking water processing and water safety [4]. The algae issue has become a global environmental problem in water environment protection and water treatment [5]. And effectively removing algae has become the key to research
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