复合型微生物絮凝剂絮凝条件的优化  

Optimization of flocculating conditions of composite microbial flocculant

作　　者：罗平 黄锃峰[1] 杨萍[1] 

机构地区：[1]重庆大学化学化工学院,重庆400030

出　　处：《环境工程学报》2012年第8期2635-2639,共5页Chinese Journal of Environmental Engineering

基　　金：重庆自然科学基金资助项目(CSTC;2008BB7180);重庆大学研究生科技创新基金个人项目(CDJXS10220003)

摘　　要：采用富集-分离-筛选的方法,从土壤中筛选得到3株具有较高絮凝活性的菌种,将其两两混合培养后,发现其对高岭土悬液的絮凝率均有较明显的提高,并且具有更好的热稳定性。实验结果表明,其最佳絮凝条件为:在pH=9时,微生物絮凝剂的最佳投量为2.0 mL,以2.0 mL 2.0%的CaCl2为助凝剂,对100 mL浓度为1 g/L的高岭土悬液的絮凝率可以达到90%以上;在与无机絮凝剂(10%PAC)和有机絮凝剂(0.1%PAM)的对比中,表现出了更高的絮凝活性和更好的絮凝效率。Three flocculants-producing strains of high flocculating activity were screened from the soil by the method of enrichment-isolation-screening, after mixed cultivating, it was found that the flocculation rate of the kaolin suspension was obviously improved, and the composite flocculant had good thermal stability. Investiga- tion of the affecting factor for the focculating kaolin suspension（ 1 g/L） revealed that the flocculation rate was up to 90.0% , when added at a final concentration of microbial flocculant of 2.0 mL/100 mL with system pH 9 and 2.0 mL of 2.0% CaC12. Meanwhile, compared with 10% PAC and 0.1% PAM, the composite microbial floccu- lant showed higher flocculation activity and better flocculation efficiency.

关 键 词：复合型微生物 絮凝剂 条件优化 

分 类 号：X703[环境科学与工程—环境工程]