一株微生物絮凝剂产生菌的筛选及絮凝特性
The screen and characterization of a microbial flocculant-producing bacterium
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摘要: 从污水处理厂活性污泥中筛选出一株具有絮凝性能的菌株,初步鉴定为假单胞菌.对该菌株产生的絮凝剂对高岭土的絮凝效果进行了研究,结果表明:当发酵液pH=7.0,投量体积分数为2.5%,助凝剂采用CaCl2且投量为1.0 g/L时,对4.0 g/L的高岭土悬液的絮凝效果最佳,絮凝率为91.6%.絮凝剂主要成分为蛋白质,其活性成分主要分布在离心后沉淀中.Abstract: A strain with flocculation activity was screened from return activated sludge from secondary settling tank and was identified as Pseudomoas.The effects of flocculant producing from this strain on kaolin suspension were investigated.The results showed that the flocculation effect on 4.0 g/L kaolin suspension was the best when fermentation liquor pH was 7.0,bioflocculant dosage was 2.5%(V/V),coagulant aid CaCl2 dosage was 1.0 g/L and flocculation rate was 91.6%.The main components were protein,the active components of the flocculant mostly existed in deposition after centrifugation.
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Key words:
- microbial flocculant /
- activated sludge /
- strain screen /
- flocculation activity
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