Waste scrap iron was packed into an upflow anaerobic sludge blanket (UASB) reactor to form a zero valent iron (ZVI) - UASB reactor system for treatment of azo dye wastewater. The ZVI acted as a reductant to decrease ORP in the reactor by more than 40 mv and functioned as an acid buffer to increase the pH in the reactor from 5.44 to 6.29, both of which improved the performance of the anaerobic reactor. As a result, the removal of color and COD in this reactor was 91.7% and 53%, respectively, which was significantly higher than that of a reference UASB reactor without ZVI. The UV-visible spectrum demonstrated that absorption bands of the azo dye from the ZVI-UASB reactor were substantially reduced. The ZVI promoted methanogenesis, which was confirmed by an increase in CH4 content in the biogas from 47.9% to 64.8%. The ZVI bed was protected well from rusting, which allowed it to function stably. The effluent could be further purified only by pH adjustment because the Fe2+ released from ZVI served as a flocculent.
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Research Article|
February 01 2011
A built-in zero valent iron anaerobic reactor to enhance treatment of azo dye wastewater
Yaobin Zhang;
Yaobin Zhang
1Key Laboratory of Industrial Ecology and Environmental Engineering, Ministry of Education, Department of Environmental Science and Technology, Dalian University of Technology, Dalian 116024, China E-mail: zhangyb@dlut.edu.cn; jyw076@yahoo.com.cn; 200446108@163.com; ukapas@yahoo.com
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Yanwen Jing;
Yanwen Jing
1Key Laboratory of Industrial Ecology and Environmental Engineering, Ministry of Education, Department of Environmental Science and Technology, Dalian University of Technology, Dalian 116024, China E-mail: zhangyb@dlut.edu.cn; jyw076@yahoo.com.cn; 200446108@163.com; ukapas@yahoo.com
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Xie Quan;
1Key Laboratory of Industrial Ecology and Environmental Engineering, Ministry of Education, Department of Environmental Science and Technology, Dalian University of Technology, Dalian 116024, China E-mail: zhangyb@dlut.edu.cn; jyw076@yahoo.com.cn; 200446108@163.com; ukapas@yahoo.com
E-mail: quanxie1@dlut.edu.cn
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Yiwen Liu;
Yiwen Liu
1Key Laboratory of Industrial Ecology and Environmental Engineering, Ministry of Education, Department of Environmental Science and Technology, Dalian University of Technology, Dalian 116024, China E-mail: zhangyb@dlut.edu.cn; jyw076@yahoo.com.cn; 200446108@163.com; ukapas@yahoo.com
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Pascal Onu
Pascal Onu
1Key Laboratory of Industrial Ecology and Environmental Engineering, Ministry of Education, Department of Environmental Science and Technology, Dalian University of Technology, Dalian 116024, China E-mail: zhangyb@dlut.edu.cn; jyw076@yahoo.com.cn; 200446108@163.com; ukapas@yahoo.com
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Water Sci Technol (2011) 63 (4): 741–746.
Citation
Yaobin Zhang, Yanwen Jing, Xie Quan, Yiwen Liu, Pascal Onu; A built-in zero valent iron anaerobic reactor to enhance treatment of azo dye wastewater. Water Sci Technol 1 February 2011; 63 (4): 741–746. doi: https://doi.org/10.2166/wst.2011.301
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