微生物絮凝剂对废水中黄药和铅离子的去除

Removal of xanthate and lead ions from wastewater by microbial flocculant

为解决铅锌硫化矿浮选废水难处理的问题,以解淀粉芽孢杆菌(ZWG)产生的微生物絮凝剂(MBF)去除废水中的Pb(Ⅱ)与黄药,考察了MBF投加量、pH值、初始质量浓度以及搅拌时间对MBF处理Pb(Ⅱ)、黄药废水的影响,并通过热稳定性、紫外光谱、红外(FTIR)光谱、Zeta电位和显微镜分析了MBF的主要成分并探究其去除Pb(Ⅱ)和黄药的机理.结果表明:在最佳条件下,MBF对Pb(Ⅱ)和黄药的去除率分别为87.8%和16.8%;在Pb(Ⅱ)和黄药共存废水中,MBF对Pb(Ⅱ)和黄药去除率分别为93.2%和98.5%.热稳定性分析和紫外光谱分析表明:MBF的主要成分为多糖;FTIR结果表明:MBF上的羟基和羧基官能团吸附废水中的黄药和Pb(Ⅱ);Zeta电位结果表明:溶液中的Pb(Ⅱ)会与阴离子型MBF之间发生电性中和反应;显微镜结果表明:MBF可与水中的Pb(Ⅱ)和黄药之间发生吸附架桥作用和卷扫作用.本研究使用MBF处理废水中的Pb(Ⅱ)和黄药,具有较好的去除效果.

To solve the problem of difficult treatment of lead-zinc sulfide ore flotation wastewater,the microbial flocculant(MBF)produced by Bacillus amyloliquefaciens(ZWG)was used to remove Pb(Ⅱ)and xanthate in wastewater.The effects of MBF dosage,pH value,initial mass concentration and stirring time on the treatment of Pb(Ⅱ)and xanthate wastewater by MBF were investigated.The main components of MBF were analyzed by thermal stability,UV spectrum,FTIR spectrum,Zeta potential and microscope,and the mechanism of removing Pb(Ⅱ)and xanthate was explored.The results show that under the optimal conditions,the removal rates of Pb(Ⅱ)and xanthate by MBF are 87.8%and 16.8%,respectively.In the wastewater coexisting Pb(Ⅱ)and xanthate,the removal rates of Pb(Ⅱ)and xanthate by MBF are 93.2%and 98.5%,respectively.Thermal stability analysis and UV spectrum analysis show that the main component of MBF is polysaccharide.FTIR results show that the hydroxyl and carboxyl functional groups of MBF adsorbed xanthate and Pb(Ⅱ)in wastewater.Zeta potential results show that Pb(Ⅱ)in solution would have an electrical neutralization reaction with anionic MBF.Microscopic results show that MBF could have adsorption bridging and sweeping effects with Pb(Ⅱ)and xanthate in water.In this study,MBF is used to treat Pb(Ⅱ)and xanthate in wastewater with a good removal effect.