重金属对硫酸盐还原菌影响  

Effect of Heavy Metal on Sulfate Reducing Bacteria

作　　者：曹恒恒[1] 张鸿郭[1] 罗定贵[1] 陈永亨[1] 张庆合[1] 

机构地区：[1]广州大学环境科学与工程学院,珠江三角洲水质安全与保护省部共建重点实验室,广东广州510006

出　　处：《环境科学与技术》2012年第12期208-211,218,共5页Environmental Science & Technology

基　　金：广东省-国家自然科学基金联合基金(U0633001);广东省科技项目(2009B030802017;2010B030900008);广东省教育厅育苗工程项目(20102002);广州市珠江科技新星项目;"工业聚集区污染控制与生态修复"教育部重点实验室开放基金项目

摘　　要：含重金属硫酸盐废水是我国工业水污染的突出问题,利用硫酸盐还原菌的生物去除重金属的方法具有投资少、成本低、能耗少、去除率高,没有二次污染等优点而成为研究的热点。文章以混合培混养物作为接种污泥,考察不同浓度的重金属离子(Cu2+、Cd2+、Ni2+、Hg2+)对硫酸盐还原菌(Sulfate reducing bacteria,SRB)的抑制作用。研究表明:10 mg/L的Cu2+、Cd2+和20 mg/L的Hg2+对SRB还原硫酸盐的影响较小,硫酸盐最大去除率可分别达到94.1%、94.6%、91.3%,与空白(93.9%)相近;20 mg/L的Cu2+对SRB的抑制最为强烈,硫酸盐最大还原率仅为48.2%,剩余金属离子(Cd2+、Ni2+、Hg2+)都分别随着浓度的增大而对SRB的抑制作用增强;相同浓度的重金属离子对SRB的抑制顺序为Ni2+>Cu2+>Cd2+>Hg2+,抑制浓度分别为10、20、30、60 mg/L。最后阐述了各个反应器中硫酸盐还原率最大时,(WCOD/WSO42-)与硫酸盐还原率的关系。This paper related to a bench scale experiment for treatment of wastewater containing both sulfate and heavy metals ions of Cu2＋, Cd2., Ni2＋ and Hg2＋ with emphasis on influences of heavy metals on sulfate-reduction bacteria（SRB）in the anaerobic activated sludge system （UASB reactor）. The experiment presented the maximum sulfate reduction rates - all above 91%-when affected by Cu2＋, Cd2＋ and Hg2＋ of limited concentrations respectively; the strongest inhibitory effect exerted by heavy metal ions, e.g. copper ion, when its concentration rose to as high as 20 mg/L, as a result, the sulfate reduction rate was brought down to 48.2%. According to the experiment, inhibitory rating of the above heavy metals was Ni 〉Cu〉Cd〉 Hg. In addition, due to the fact that COD in the wastewater sample decreased when sulfate being removed, relationship between COD reduction and sulfate reduction rate （WCOD/WSO4^2-） was studied in this paper.

关 键 词：硫酸盐还原菌 硫酸盐 重金属 废水处理 

分 类 号：X703[环境科学与工程—环境工程]