摘要
比较了生物絮凝剂γ-聚谷氨酸与PAM、PAC及FeCl_3等3种常规化学絮凝剂对5g/L高岭土悬浊液的絮凝效果。结果表明,γ-聚谷氨酸的絮凝活性较高,投加量在0.02g/L以上时均能获得>90%的絮凝率,其最佳投加量为0.30g/L,此时上清液浊度为3.2 NTU,絮凝率达97.82%,絮体粗大,固液分离迅速,产泥量小,无毒。γ-聚谷氨酸絮凝剂处理各种浓度工业废水的结果表明,其对溶解性有机物的去除效率不高,较适用于处理低浓度工业废水以及河流水体的净化,其在中、高浓度工业废水的处理中并没有显示出比PAM和PAC等化学絮凝剂更为优异的絮凝效果,且与PAM相比,γ-聚谷氨酸絮凝剂的投加量偏大。
The present paper takes as its goal to disclose the floeculation capability between γ-PGA and chemical floceulant by studying the 5 g/L kaolin suspension. The results of our study prove that γ- PGA can be made highly active in flocculation, that is, as high as above 90% of its flocculation rate on the condition when the dosage of γ-PGA is over 0.02 g/L. The optimal dosage of γ-PGA would be 0.30 g/L, that is, on the condition when the surplus turbidity could get up to as high as 3.2 NTU, with its iloeeulatlon rate going up to 97.82%. However, it is regretful to see that the results with all kinds of organic wastewater treatment in different concentrations show that the resolvable organic removal rate of γ-PGA remains comparatively low, which proves that γ-PGA is only sultable or ibasible for treating industrial wastewater of low concentration as well as for depurating river water. Therefore, it can be concluded that in processing industrial wastewater of middle and high concentrations γ-PGA proves less advantageous over PAM and PAC, which prove to be suitable for treating wastewater of higher concentrations.
出处
《安全与环境学报》
CAS
CSCD
2007年第6期48-50,共3页
Journal of Safety and Environment
