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重金属对硫酸盐还原菌影响
引用本文:曹恒恒,张鸿郭,罗定贵,陈永亨,张庆合. 重金属对硫酸盐还原菌影响[J]. 环境科学与技术, 2012, 0(12): 208-211,218
作者姓名:曹恒恒  张鸿郭  罗定贵  陈永亨  张庆合
作者单位: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
基金项目: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。

关 键 词:硫酸盐还原菌  硫酸盐  重金属  废水处理

Effect of Heavy Metal on Sulfate Reducing Bacteria
CAO Heng-heng,ZHANG Hong-guo,LUO Ding-gui, CHEN Yong-heng,ZHANG Qing-he. Effect of Heavy Metal on Sulfate Reducing Bacteria[J]. Environmental Science and Technology, 2012, 0(12): 208-211,218
Authors:CAO Heng-heng  ZHANG Hong-guo  LUO Ding-gui   CHEN Yong-heng  ZHANG Qing-he
Affiliation:(School of Environmental Science and Engineering,Guangzhou University,Guangzhou 510006,China)
Abstract: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/WSO42-) was studied in this paper.
Keywords:sulfate-reduction bacteria(SRB)  sulfate  heavy metal  wastewater treatment
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