复合型微生物絮凝剂絮凝条件的优化

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。

Optimization of flocculating conditions of composite microbial flocculant

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.Investigation of the affecting factor for the flocculating 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%CaCl2.Meanwhile,compared with 10%PAC and 0.1%PAM,the composite microbial flocculant showed higher flocculation activity and better flocculation efficiency.