Steady performance of a zero valent iron packed anaerobic reactor for azo dye wastewater treatment under variable influent quality  

作　　者：Yaobin Zhang Yiwen Liu Yanwen Jing Zhiqiang Zhao Xie Quan 

机构地区：[1]Key Laboratory of Industrial Ecology and Environmental Engineering(MOE),School of Environmental Science and Technology,Dalian University of Technology,Dalian 116024,China

出　　处：《Journal of Environmental Sciences》2012年第4期720-727,共8页环境科学学报（英文版）

基　　金：supported by the National Basic Research Program of China (No. 2007CB407302);the Natural Science Foundation of China (No. 21177015);the New Century Excellent Talent Program of the Ministry of Education of China (No. NCET-10-028);the Fundamental Research Funds for the Central Universities of China (No.DUT11ZD108);the Program for Changjiang Scholars and Innovative Research Team at the University of China(No. IRT0813)

摘　　要：Zero valent iron （ZVI） is expected to help create an enhanced anaerobic environment that might improve the performance of anaerobic treatment. Based on this idea, a novel ZVI packed upflow anaerobic sludge blanket （ZVI-UASB） reactor was developed to treat azo dye wastewater with variable influent quality. The results showed that the reactor was less influenced by increases of Reactive Brilliant Red X-3B concentration from 50 to 1000 mg/L and chemical oxygen demand （COD） from 1000 to 7000 mg/L in the feed than a reference UASB reactor without the ZVI. The ZVI decreased oxidation-reduction potential in the reactor by about 80 mV. Iron ion dissolution from the ZVI could buffer acidity in the reactor, the amount of which was related to the COD concentration. Fluorescence in situ hybridization test showed the abundance of methanogens in the sludge of the ZVI-UASB reactor was significantly greater than that of the reference one. Denaturing gradient gel electrophoresis showed that the ZVI increased the diversity of microbial strains responsible for high efficiency.Zero valent iron （ZVI） is expected to help create an enhanced anaerobic environment that might improve the performance of anaerobic treatment. Based on this idea, a novel ZVI packed upflow anaerobic sludge blanket （ZVI-UASB） reactor was developed to treat azo dye wastewater with variable influent quality. The results showed that the reactor was less influenced by increases of Reactive Brilliant Red X-3B concentration from 50 to 1000 mg/L and chemical oxygen demand （COD） from 1000 to 7000 mg/L in the feed than a reference UASB reactor without the ZVI. The ZVI decreased oxidation-reduction potential in the reactor by about 80 mV. Iron ion dissolution from the ZVI could buffer acidity in the reactor, the amount of which was related to the COD concentration. Fluorescence in situ hybridization test showed the abundance of methanogens in the sludge of the ZVI-UASB reactor was significantly greater than that of the reference one. Denaturing gradient gel electrophoresis showed that the ZVI increased the diversity of microbial strains responsible for high efficiency.

关 键 词：anaerobic reactor zero valent iron azo dye wastewater 

分 类 号：X788[环境科学与工程—环境工程] X791