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Advantages of intermittently aerated SBR over conventional SBR on nitrogen removal for the treatment of digested piggery wastewater |
Xiaoyan Song1, Rui Liu1(), Lujun Chen1,2(), Baogang Dong1, Tomoki Kawagishi3 |
1. Zhejiang Provincial Key Laboratory of Water Science and Technology, Department of Environment in Yangtze Delta Region Institute of Tsinghua University-Zhejiang, Jiaxing 314006, China 2. School of Environment, Tsinghua University, Beijing 100084, China 3. Aqua Development Center, Mitsubishi Rayon Co. Ltd., Toyohashi 4408601, Japan |
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Abstract The mass balance analysis of organic carbon were applied. The IASBR displays higher ratios of denitrificated organic carbon. The effects of anoxic stress duration on nitrification activity were evaluated. The anoxia time of 40–80 min achieves more stable nitritation. The intermittent aeration strategy improved the removal of fluorescent substance.
![]() An intermittently aerated sequencing batch reactor (IASBR) and a traditional sequencing batch reactor (SBR) were parallelly constructed to treat digested piggery wastewater, which was in high NH4+-N concentration but in a low COD/TN ratio. Their pollutant removal performance was compared under COD/TN ratios of 1.6–3.4 d and hydraulic retention times of 5–3 d. The results showed that the IASBR removed TN, NH4+-N and TOC more efficiently than the SBR. The average removal rates of TN, NH4+-N and TOC were 83.1%, 96.5%, and 89.0%, respectively, in the IASBR, significantly higher than the corresponding values of 74.8%, 82.0%, and 86.2% in the SBR. Mass balance of organic carbon revealed that the higher TN removal in the IASBR might be attributed to its efficient utilization of the organic carbon for denitrification, since that 48.7%–52.2% of COD was used for denitrification in the IASBR, higher than the corresponding proportion of 43.1%–47.4% in the SBR. A pre-anoxic process in the IASBR would enhance the ammonium oxidation while restrict the nitrite oxidation. Anoxic duration of 40–80 min should be beneficial for achieving stable nitritation.
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Keywords
Anoxic stress
Carbon source
Digested piggery wastewater
Intermittently aerated SBR (IASBR)
Total nitrogen
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Corresponding Author(s):
Rui Liu,Lujun Chen
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Issue Date: 11 May 2017
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