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| Performance of a Combined Simultaneous Methanogenesis and Denitrification（SMD）-Shortcut Nitrification and Denitrification Process in Slaughterhouse Processing Wastewater Treatment |
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| KeyWord:slaughterhouse wastewater；simultaneous methanogenesis and denitrification; shortcut nitrification and denitrification; combined process; nitrogen removal |
| Author Name | Affiliation | | LIU Yu-hao | Key Laboratory of the Three Gorges Reservoir Region′s Eco-Environment, Ministry of Education, Chongqing University | | PENG Xu-ya | Key Laboratory of the Three Gorges Reservoir Region′s Eco-Environment, Ministry of Education, Chongqing University | | HE Qing-ming | Key Laboratory of the Three Gorges Reservoir Region′s Eco-Environment, Ministry of Education, Chongqing University | | LI Lei | Key Laboratory of the Three Gorges Reservoir Region′s Eco-Environment, Ministry of Education, Chongqing University |
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| Abstract: |
| In a pilot-scale trial, a continuous stirred tank reactor（CSTR） combined with a modified sequencing batch reactor（MSBR） was used for slaughterhouse wastewater treatment.The CSTR was used as a simultaneous methanogenesis and denitrification（SMD） reactor,as well as the MSBR was used as a shortcut nitrification and denitrification reactor. In the natural temperature condition,by controlling the dissolved oxygen at 0.7~1.2 mg·L-1, shortcut nitrification was achieved. Partial MSBR effluent was refluxed to the CSTR in different stages to accomplish SMD. Under steady operation conditions, the effects of the combined process for slaughterhouse wastewater treatment were investigated. Furthermore, the contributions of CSTR and MSBR in the combined process for COD、NH+4-N、TN removal were analyzed. The COD、NH+4-N、TN removal efficiencies were 97.12%、95.13%、77.14% respectively. The contribution of CSTR on COD removal was 68.35% and the contribution of MSBR on TN removal was 72.34%. The contribution of CSTR in TN and NH+4-N removal were 27.66% and -33.42% respectively. The contribution of MSBR on COD and NH+4-N removal were 31.65% and 133.42% respectively. The suitable reflux ratio of the combined process was 75%;The COD, NH+4-N and TN removal efficiencies and reactor stability were significantly influenced by temperature. The percentage of methane achieved 66.70% in the composition of biogas under the 75% reflux ratio condition. The nitrite accumulation rate（NAR） was above 65%. |
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