%0 Journal Article
%T Extraction of microbial flocculant from waste sludge by ultrasonic method<br>基于剩余污泥的超声法提取微生物絮凝剂
%A Zhang Yanjun
%A Zhang Zhiqiang
%A Dai Xiaoqing
%A Wang Chunhui
%A Xia Siqing
%A <br>张艳君
%A 张志强
%A 戴晓晴
%A 王春晖
%A 夏四清
%J 环境工程学报
%D 2012
%I 
%X The extraction of microbial flocculant(MBF) from waste sludge by ultrasonic method was systematically investigated in the present study.The MBF extracted from the sludge showed higher flocculation efficiency under alkaline conditions than that under neutral or acid conditions.Increasing the sludge concentration enhanced the flocculation efficiency of the extracted MBF.High ultrasonic frequency or high ultrasonic power caused adverse effects on the MBF extraction because of the crack role of ultrasound.Extraction efficiency with continuous ultrasonic was higher than that with 1 s,4 s or 8 s under ultrasonic frequency of 20 kHz.Under the ultrasonic treatment conditions of frequency of 20 kHz,power of 120 W,and continuous ultrasonic time of 30 s,the flocculation efficiency of the MBF extracted from waste sludge(19.4 g/L) for kaolin suspension was close to 70%.Therefore,ultrasonic method is feasible to extract MBF from waste sludge,which facilitates the resource utilization of waste sludge other than decreasing the cost of MBF production.
%K waste sludge
%K microbial flocculant
%K ultrasonic method
%K flocculation efficiency<br>剩余污泥
%K 微生物絮凝剂
%K 超声法
%K 絮凝率
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=3FF3ABA7486768130C3FF830376F43B398E0C97F0FF2DD53&cid=92E6F4267FD4CBCB51B1E49E014D8054&jid=3567BD61129AA59043F5DE01F8815DB5&aid=4B593C892672BD8C151B5B9109E8866F&yid=99E9153A83D4CB11&vid=B31275AF3241DB2D&iid=38B194292C032A66&sid=0342E221E01D5238&eid=78996380F3108204&journal_id=1673-9108&journal_name=环境工程学报&referenced_num=0&reference_num=0