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 BOD5/COD ratio and COD/TN ratio than wastewater A. The effects of reflux ratios on COD, TN and NH3-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 BOD5/COD and COD/TN ratio. Reflux ratio had no significant influence on NH3-N removal; 99.0% of the overall NH3-N removal efficiency was achieved by the system for both coke plant wastewaters at any tested reflux ratio. MBBR was effective in NH3-N removal, and about 95% of the NH3-N was removed in the MBBR.
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Research Article|
June 01 2010
Effect of reflux ratio on COD and nitrogen removals from coke plant wastewaters
X. L. Shi;
1State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210093, Jiangsu, People's Republic of China E-mail: xiaols_121@163.com; dg0925019@stu.nju.edu.cn; wangzh_83@163.com; dinglili@nju.edu.cn; hqren@nju.edu.cn
E-mail: xiaols_121@163.com
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X. B. Hu;
X. B. Hu
1State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210093, Jiangsu, People's Republic of China E-mail: xiaols_121@163.com; dg0925019@stu.nju.edu.cn; wangzh_83@163.com; dinglili@nju.edu.cn; hqren@nju.edu.cn
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Z. Wang;
Z. Wang
2College of Environmental Science and Engineering, Hebei University of Science and Technology, Shijiazhuang 050018, Hebei, People's Republic of China E-mail: wangzh_83@163.com
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L. L. Ding;
L. L. Ding
1State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210093, Jiangsu, People's Republic of China E-mail: xiaols_121@163.com; dg0925019@stu.nju.edu.cn; wangzh_83@163.com; dinglili@nju.edu.cn; hqren@nju.edu.cn
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H. Q. Ren
H. Q. Ren
1State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210093, Jiangsu, People's Republic of China E-mail: xiaols_121@163.com; dg0925019@stu.nju.edu.cn; wangzh_83@163.com; dinglili@nju.edu.cn; hqren@nju.edu.cn
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Water Sci Technol (2010) 61 (12): 3017–3025.
Citation
X. L. Shi, X. B. Hu, Z. Wang, L. L. Ding, H. Q. Ren; Effect of reflux ratio on COD and nitrogen removals from coke plant wastewaters. Water Sci Technol 1 June 2010; 61 (12): 3017–3025. doi: https://doi.org/10.2166/wst.2010.266
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