期刊
WATER SCIENCE AND TECHNOLOGY
卷 61, 期 12, 页码 3017-3025出版社
IWA PUBLISHING
DOI: 10.2166/wst.2010.266
关键词
chemical oxygen demand; coke plant wastewater; nitrogen removal; reflux ratio
资金
- Education Ministry [108150]
- Essential Support Plan of Science and Technology by Jiangsu Province [BS2008006]
A laboratory-scale anaerobic-anoxic-aerobic-moving bed biofilm reactor (A1-A2-O-MBBR) system was undertaken to treat coke plant wastewaters from two different factories (wastewater A and B). Wastewater B had higher BOD(5)/COD ratio and COD/TN ratio than wastewater A. The effects of reflux ratios on COD, TN and NH(3)-N removals were studied. Results indicated that, with the reflux ratio increased from 2 to 5, COD removals of wastewater A and wastewater B increased from 57.4% to 72.6% and 78.2% to 88.6%, respectively. Meanwhile, TN removals were also increased accompanying reflux ratio rise, from 53.1% to 74.4% for wastewater A and 64.2% to 83.5% for wastewater B. At the same reflux ratio, compared with wastewater A, higher COD and TN removal efficiencies were observed in wastewater B, which had higher BOD(5)/COD and COD/TN ratio. Reflux ratio had no significant influence on NH(3)-N removal; 99.0% of the overall NH(3)-N removal efficiency was achieved by the system for both coke plant wastewaters at any tested reflux ratio. MBBR was effective in NH(3)-N removal, and about 95% of the NH(3)-N was removed in the MBBR.
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