Preparation of Cationic Chitosan-Polyacrylamide Flocculant and Its Properties in Wastewater Treatment

查看全文 作　　者：WANG [1]Ben;ZHANG [2]Yulian;MIAO [2]Chunbao

机构地区：[1]School of Environment and Safety Engineering, Qingdao University of Science & Technology, Qingdao 266042, P. R. China;[2]Qingdao Hygain Chemical (group) Co., LTD, Qingdao 266042, P. R. China

出　　处：《Journal of Ocean University of China》索引2011年第10卷第1期,共5页

基　　金：supported by Young Scientist Foundation (2008BS09001) from the Department of Science and Technology of Shandong Province 摘　　要：Chitosan derived from crab shells,was used to prepare the graft polymer in aqueous solution with acrylamide (AM) and methacrylatoethyl trimethyl ammonium chloride (DMC) as raw materials and ceric ammonium nitrate (CAN) as initiator.The floc-culation ability of the resulting polymer (PCAD) was studied in waste water treatment experiments.Its properties were determined on the basis of the transmittance of waste water after flocculation.The effects of chitosan and DMC content on PCAD’s flocculation ability were studied.Flocculation experiments were also undertaken under various pH conditions.According to the experimental data,the flocculation ability could be improved when chitosan content decreased in the raw material,but the monomer conversion would decrease obviously.When the chitosan’s content was more than 65%,AM and DMC groups were less on each chitosan molecule.So PCAD’s flocculation ability was poor.Similarly,high content of DMC would result in low monomer conversion and high floccula-tion ability.PCAD molecules with more DMC group had more positive charges.It was favorable to flocculation.However,monomer conversion would decrease with the increase of DMC content.The suitable conditions were that chitosan and DMC contents were 65% and 15-20%,respectively.The experiment data showed that PCAD had good flocculation ability under weak acidic condition.Its ability would be weakened by strong acidic or alkaline condition.The flocculation efficiency was the best at pH of 5.5 when PCAD’s dosage was 8mg?L-1.Compared with cationic polymer (the copolymer of AM and DMC,PAD),PCAD showed better floc-culation ability under acid and neutral conditions,but worse ability under alkaline condition. 关键词：阳离子聚合物聚丙烯酰胺废水处理絮凝剂壳聚糖单体转化率絮凝能力 pCAD

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Preparation of Cationic Chitosan-Polyacrylamide Flocculant and Its Properties in Wastewater Treatment

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