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| Study on nitrogen removal effect of non-circumfluence bio-filter purifying tank |
| Received:July 22, 2017 Revised:October 16, 2017 |
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| KeyWord:domestic sewage;purifying tank;bio-filter;A/O/A/O process;step-feed;nitrogen removal |
| Author Name | Affiliation | | WANG Chang | College of Marine and Environmental Sciences, Tianjin University of Science & Technology, Tianjin 300457, China | | HU Jie | College of Marine and Environmental Sciences, Tianjin University of Science & Technology, Tianjin 300457, China | | WANG Yao-chen | College of Marine and Environmental Sciences, Tianjin University of Science & Technology, Tianjin 300457, China | | MA Yue-fan | College of Marine and Environmental Sciences, Tianjin University of Science & Technology, Tianjin 300457, China | | ZENG Ming | College of Marine and Environmental Sciences, Tianjin University of Science & Technology, Tianjin 300457, China | | LI Li | College of Marine and Environmental Sciences, Tianjin University of Science & Technology, Tianjin 300457, China |
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| Abstract: |
| A non-circumfluence multi-functional integrated bio-filter purifying tank was developed to study the removal performance of nitrogen and chemical oxygen demand(COD) in rural domestic sewage. The influence of support media on pollutant biodegradation was investigated by adding support media in each zone in a stepwise manner. Subsequently, the aeration condition was changed to anaerobic/oxide/anoxic/oxide(A/O/A/O) mode and variations of COD, NH4+-N, NO3--N, and total nitrogen(TN) concentrations in each zone were detected. Stable effluent quality and good resistance to shock-loading were achieved in the purifying tank when the support media were employed. In the A/O/A/O system, the denitrification efficiency was unsatisfactory because of the lack of carbon source in the second anoxic stage. However, when the step-feed strategy was adopted, the treating performance of the purifying tank became stable and afforded highly efficient nitrogen removal. Specifically, the average effluent concentration of COD, NH4+-N, and TN reached 12.3, 2.7 mg·L-1 and 13.0 mg·L-1, respectively, which satisfies the national primary A of discharge standard(GB 18918-2002). Overall, the purifying tank with the A/O/A/O operation mode not only performed as a compact reactor to remove nitrogen by step-feed, but also avoided the recirculation of sludge by employing the bio-filter and saved energy costs. |
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