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Environmental Engineering Research 2020;25(3): 309-315. DOI: https://doi.org/10.4491/eer.2019.091
Effect of the supernatant reflux position and ratio on the nitrogen removal performance of anaerobic-aerobic slaughterhouse wastewater treatment process
Shuang Tong1,2  , Yan Zhao1,2, Ming Zhu1,2, Jing Wei1,2, Shaoxiang Zhang3, Shujie Li4, and Shengdan Sun3
1Beijing Key Laboratory of Meat Processing Technology, China Meat Research Center, Beijing 100068, China
2Beijing Academy of Food Sciences, Beijing 100068, China
3School of Water Resources and Environment, China University of Geosciences Beijing, Beijing 100083, China
4School of Civil and Architectural Engineering, Liaoning University of Technology, Jinzhou 121001, Liaoning, China
Corresponding Author: Shuang Tong ,Tel: +86-10-67264755, Fax: +86-10-87293157, Email: selina_wen@foxmail.com
Received: February 14, 2019;  Accepted: April 29, 2019.
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Slaughterhouse wastewater (SWW) is characterized as one of the most harmful agriculture and food industrial wastewaters due to its high organic content. The emissions of SWW would cause eutrophication of surface water and pollution of groundwater. This study developed a pilot scale anaerobic-aerobic slaughterhouse wastewater treatment process (AASWWTP) to enhance the chemical oxygen demand (COD) and total nitrogen (TN) removal. The optimum supernatant reflux position and ratio for TN removal were investigated through the modified Box-Behnken design (BBD) experiments. Results showed that COD could be effectively reduced over the whole modified BBD study and the removal efficiency was all higher than 98%. The optimum reflux position and ratio were suggested to be 2 alure and 100%, respectively, where effluent TN concentration was satisfied with the forthcoming Chinese discharge standard of 25 mg/L. Anaerobic digestion and ammonia oxidation were considered as the main approaches for COD and TN removal in the AASWWTP. The results of inorganic nutrients (K+, Na+, Ca2+ and Mg2+) indicated that the SWW was suitable for biological treatment and the correspondingly processes such as AASWWTP should be widely researched and popularized. Therefore, AASWWTP is a promising technology for SWW treatment but more research is needed to further improve the operating efficiency.
Keywords: Enhanced nitrogen removal | Modified Box-Behnken design (BBD) | Partial denitrification (PD)-ANAMMOX | Slaughterhouse wastewater (SWW) treatment | SWW treatment processes comparison
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