用硫酸盐还原菌去除废水中砷、锑的实验研究

Experimental Study on Removal of Arsenic and Antimony from Wastewater by Sulfate Reducing Bacteria

为了明确硫酸盐还原菌(SRB)同时去除废水中砷和锑的可行性以及去除过程中两种元素有无相互影响,我们设置了对照组、砷处理组、锑处理组、砷和锑处理组,并分析和比较了SRB在不同分组的生长差异及砷和锑去除率的异同等。结果表明,SRB可去除95%以上的总锑(Sb(T)),但对同一条件下、同样初始浓度的总砷(As(T)),去除率仅达6%。两种元素共存时,SRB对Sb(T)的去除效率没有显著变化,但明显提高了对As(T)的去除效率。处理过程中,水体中Sb(T)迅速下降至较低浓度并保持稳定,As(T)下降较慢且在后期因沉淀物再次溶解而升高。总体来看,SRB除Sb较为高效,除As则对基质理化条件更为敏感,需要探讨更为适合的基质环境来强化对两种元素的去除效果。

To clarify the feasibility of removing arsenic and antimony simultaneously from wastewater by sulfate reducing bacteria( SRB) and whether there were any interactions between arsenic and antimony during the removal process,we set up five groups( two control group,an arsenic treatment group,an antimony treatment group,an arsenic and antimony treatment group) and then compared the differences in the growth of SRB and the difference in the removal rates of arsenic and antimony by SRB in different treatment groups. The results showed that SRB could remove more than 95% of total antimony( Sb( T)),but for total arsenic( As( T)),sulfate reducing bacteria could only remove 6% under the same condition and the same initial concentration. When the two elements coexisted,the removal efficiency of Sb( T) by SRB did not change significantly,but the removal efficiency of As( T) increased significantly. During the treatment process,the aqueous Sb( T) quickly dropped to a much lower concentration and then remained stable,while,As( T)decreased slowly and then increased due to the dissolution of the generated precipitate in the later period. In general,sulfate reducing bacteria could remove Sb more efficiently,and the proceeding of removing As was more sensitive to the physical and chemical conditions of the matrix,therefore,it was necessary to explore a more suitable matrix environment to strengthen the removal effect of the two elements.