Title: Flocculation properties of the compound bioflocculant
Abstract: Cationic modified chitosan(CAD) was made by grafting acrylamide(AM) and dimethyl diallyl ammonium chloride(DMDAAC) to the chitosan molecules through free radical polymerization in aqueous solution.Characterized by FT-IR,XRD and Gel Chromatography,CAD was faint yellow transparent liquid with pH 3.7,relative molecular mass 2.88x106,cationic degree 16.7,isoelectric point(0.1% solution) about pH 10.5 and effective components 2.6%.The main functional groups of CAD were hydroxyl,amino,quaternary ammonium group and amide group.The microbial flocculant MBF8 produced by fermentation of aspergillus fumigatus was polysaccharide electronegativity polymer with relative molecular weight of 3.67x105.The flocculation characteristics of the complex of MBF8 and CAD were investigated by flocculation of pairing kaolin suspension(turbidity 12 ~ 460NTU,ionic strength 3 mmol·L-1) in beaker.The result showed that MBF8 should be preferentially added with optimum doses ratio 5∶ 3 and pH 6.0 ~10.0.Under turbidity 110 NTU and pH 8,the combination of PAC(3 mg·L-1) + MBF8 + CAD(1.0 mg·L-1) showed high efficiency for flocculation of kaolin suspension that could remove up to 97% of turbidity.The residual aluminum was less than 0.08 mg·L-1.The flocs can be settled quickly due to their compact clustering and the flocculation performance was better than that of PAC + cationic PAM with molecular weight between 8 million and 12million and of PAC + anionic PAM with molecular weight of 15 million.
Publication Year: 2013
Publication Date: 2013-01-01
Language: en
Type: article
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