微生物絮凝剂与聚合氯化铝复配的响应面优化  

Application of response surface methodology to the composite flocculant of MBFGA1 and PAC.

作　　者：黄兢[1] 杨朝晖[1] 孙珮石[2] 曾光明[1] 周长胜[1] 阮敏[1] 

机构地区：[1]湖南大学环境科学与工程学院,湖南长沙410082 [2]云南大学环境与湖泊研究院,云南昆明650091

出　　处：《中国环境科学》2008年第11期1014-1019,共6页China Environmental Science

基　　金：国家自然科学基金资助项目(50478053);长江学者和创新团队发展计划资助;湖南省自然科学基金重点项目(05JJ2004)

摘　　要：采用响应面分析法(RSM)对多粘类芽孢杆菌(GA1)所产絮凝剂(MBFGA1)与聚合氯化铝(PAC)配合处理高岭土悬浊液的过程进行了优化.设定的5个影响因子分别为MBFGA1投加量、PAC投加量、pH值、CaCl2投加量、快搅速度.2个响应值为絮凝率和絮体粒径.响应面实验分别拟合出了关于絮凝率和絮体粒径的二次模型,决定系数(R2)分别为0.7449和0.8029,表明拟合情况良好.根据2个响应值的分布情况,推算出最适粒径为0.7mm.同时,以絮凝率100%、絮体粒径0.7mm为目标值,确定了最佳复配絮凝条件:MBFGA1 99.75mg/L,PAC 121mg/L,pH 7.3,CaCl2 27mg/L,快搅速度163r/min.通过分析比较,发现PAC在改变胶体表面电位使其脱稳聚沉方面有较强的能力,有利于MBFGA1在絮凝后期吸附架桥作用的发挥.对提高絮凝效果、降低MBFGA1运行成本具有很好的作用.The response surface methodology （RSM）, including five factors： dosage of MBFGA1, PAC, CaCl2, pH and the top speed of stir, was employed to study the treatment of kaolin suspension by the composite flocculant of MBFGA1 and PAC By response surface analysis, the two quadratic models of the five factors were established with the flocculating rate and floc size as the target responses. With of determination coefficients （R2） equal to 0.7449 and 0.8029, respectively, which indicated that they all hade a significant property. The optimal flocculating conditions were MBFGA1 dosage of 99.75mg/L, PAC dosage of 121mg/L, CaCl2 dosage of 27mg/L, pH 7.3 and top speed of stirring as 163r min, respectively. And that were obtained from the compromised results of two desirable responses, flocculating rate as 100% and floc size as 0.7mm, which were deduced from the frequency of responses. By comparison, PAC had more capability on changing the potential of colloid, which were favorable to the absorption and bridge effect of MBFGA1. The combination of two kinds of flocculants made sense on enhancing flocculating rate and reducing flocculent costs.

关 键 词：微生物絮凝剂 聚合氯化铝(PAC) 复配 响应面分析(RSM) 

分 类 号：X703.1[环境科学与工程—环境工程]