一株大肠杆菌所产絮凝剂的特性研究  

Study on Characteristics of Microbial Flocculant Produced by E.coli Strain

作　　者：张平[1] 戴友芝[2] 唐受印[3] 

机构地区：[1]中南林业科技大学资源与环境学院,长沙410004 [2]湘潭大学环境工程系,湘潭411105 [3]湖南工程学院,湘潭411104

出　　处：《湘潭大学自然科学学报》2006年第3期86-89,共4页Natural Science Journal of Xiangtan University

基　　金：湖南省计委资助项目(湘计高技[2001]907号);中南林业科技大学青年科学研究基金资助项目

摘　　要：考察了一株大肠杆菌产生的絮凝剂的絮凝特性，研究表明，该菌产絮凝剂的活性成分主要存在于上清液中，且产絮凝剂的时间与菌生长相比，稍有些滞后，该絮凝剂絮凝高岭土悬浊液时，最适宜的pH范围为5.0-8.0，最佳的高岭土悬浊液浓度为2-4g/L；不同的金属阳离子都有不同程度的助凝作用。且Ca^2＋更具优越性，其适宜浓度为0.2-0.5g/L与其他生物絮凝剂及常用絮凝剂相比，其絮凝效果及絮凝剂用量展现出较好的优势 。Flocculation characteristics of bioflocculant produced by E.coli were studied.It showed that the flocculants produceced vy E.coli mainly exist in the supernatant and they were synthesized during the cell growth,but the production time of microbial-flocculants tends to lag behind.High flocculation efficiency could be achieved when the pH values were kept in between 5.0-8.0,the concentration of kaolin clay suspension was 2-4g/L.Metal cation such as Ca^2＋,Mg^2＋ facilitatees flocculation efficiency of microbial-flocculants,and the avaiable range of Ca^2＋ is 0.2-0.5g/L.The results of flocculation test show that the E-9 can produce a strong-activity flocculants,which has higher flocculating effect compared with other MBF and ordinary flocculants against kaolin clay suspension.

关 键 词：大肠杆菌 微生物絮凝剂 絮凝特性 絮凝效果 

分 类 号：TQ925[轻工技术与工程—发酵工程] TU991.22[建筑科学—市政工程]