Optimum conditions to treat high-concentration microparticle slime water with bioflocculants  

作　　者：LIANG Zhi HAN Baoping LIU Hong 

机构地区：[1]School of Environmental Engineering, Xuzhou Institute of Technology, Xuzhou 221008, China [2]School of Environment and Spatial Informatics, China University of Mining & Technology, Xuzhou 221116, China

出　　处：《Mining Science and Technology》2010年第3期478-484,共7页矿业科学技术（英文版）

基　　金：the Shenhuo Mining Group Co.Ltd.,China for its financial support.At the same time,we also thank the National Natural Science Foundation of China(No.40373044);the Natural Science Foundation of Jiangsu Province (No.05KJD610209) for their support;the Jiangsu Key Laboratory of Resources and Environmental Information Engineering for its technical support.

摘　　要：We studied how bioflocculants,produced by white-rot fungi,affect flocculation in slime water.Based on a test in an orthogonal design,flocculation conditions were optimized.The results show that flocculation activity is at its highest when the following conditions are met:slime water concentration 27.42 g/L;coagulant aid(CaCl_2) mass concentration 5.0 g/L;two-segment stirrings:the first at a stirring speed of 60 r/min for 180 s and the second 180 r/min for 60 s;a pH of 11 and a flocculant concentration of 15 mL/L.The flocculation activity can be up to 98.71%of bioflocculants at the time.Further experiments indicate that most of the flocculation active material is found outside the mycelium cells.This is the extracellular secretion produced by mycelium cells during the fermentation process.This flocculant has strong thermal stability.Many kinds of cations have a flocculation function to assist bioflocculants.This aid-flocculation effect of the divalent cation Ca^(2+) is obvious in the bioflocculant produced by the white-rot fungus.Therefore,this is of great value when applied to control engineering in the battle against water pollution.We studied how bioflocculants,produced by white-rot fungi,affect flocculation in slime water.Based on a test in an orthogonal design,flocculation conditions were optimized.The results show that flocculation activity is at its highest when the following conditions are met：slime water concentration 27.42 g/L;coagulant aid（CaCl_2） mass concentration 5.0 g/L;two-segment stirrings：the first at a stirring speed of 60 r/min for 180 s and the second 180 r/min for 60 s;a pH of 11 and a flocculant concentration of 15 mL/L.The flocculation activity can be up to 98.71%of bioflocculants at the time.Further experiments indicate that most of the flocculation active material is found outside the mycelium cells.This is the extracellular secretion produced by mycelium cells during the fermentation process.This flocculant has strong thermal stability.Many kinds of cations have a flocculation function to assist bioflocculants.This aid-flocculation effect of the divalent cation Ca^（2＋） is obvious in the bioflocculant produced by the white-rot fungus.Therefore,this is of great value when applied to control engineering in the battle against water pollution.

关 键 词：white-rot fungus BIOFLOCCULANT flocculation condition optimization slime water orthogonal design 

分 类 号：X703.5[环境科学与工程—环境工程] TD942.62[矿业工程—选矿]