应用稳定分散复合nZⅥ反应体系修复Cr(Ⅵ)污染的研究

Application of Stable Dispersed Compositen ZⅥ Reaction System for the Remediation of Cr(Ⅵ)

为了研究添加不同稳定分散剂的纳米零价铁(nZⅥ)对土壤中Cr(Ⅵ)的去除效果,分别进行水、土壤静态实验,研究了羧甲基纤维素钠(CMC)、丙烯酸(AA)、氧化硫硫杆菌(T.t)和氧化亚铁硫杆菌(T.f)混合菌液与纳米零价铁(nZⅥ)组合以及不添加nZⅥ多种稳定分散体系,对土壤中Cr(Ⅵ)的去除效果。结果表明:加入混合菌液构成的生物复合nZⅥ反应体系提高了nZⅥ去除土壤中Cr(Ⅵ)的效果。反应进行到1 h时,CMC+AA+T.t+T.f+nZⅥ反应体系总Cr去除率最高,达到84.8%,这可能是添加稳定剂使nZⅥ颗粒分散性增强所致。

The effects of different stable dispersants modified with nano-zero-valent iron(nZⅥ)on the removal proportion of soil Cr(Ⅵ)were investigate in water and soil experiments under static conditions.The removal effects of soil Cr(Ⅵ)were conducted in various stable dispersant systems,incl uding sodium carboxymethyl cellulose(CMC),acrylic acid(AA),Thiobacillusthiooxidans(T.t)and Thiobacillusferrooxidans(T.f)mixed with or without nZⅥ.The results showed that the stable dispersants systems mixed with nZⅥimproved the removal of Cr(Ⅵ)in soil.When the experiments were carried out1 h,the total removal proportion of Cr in the CMC+AA+T.t+T.f+nZⅥreaction system was the highest,with a walue of 84.8%.Which could be that the stable dispersant system enhanced thedispersibility of nZⅥ.