The wastewater quality of several municipal wastewater treatment plants (MWTPs) in Beijing was studied, and the water densities of different processing units were also measured during the wastewater treatment process. The results clearly showed that the water density declined from influent to effluent of the wastewater treatment process. Meanwhile, the variation in water density had good statistical correlation with the concentrations of total organic carbon, total phosphorus, suspended solids and total solids. Furthermore, the variation in water density could be used to explain the working principles of the Unifed sequencing batch reactor (SBR). Tracer tests were conducted in the Unifed SBR to investigate the hydraulic characteristics of the reactor. The experimental results showed that the variable values of water density from influent to effluent in the Fangzhuang MWTPs were greater than those caused by the temperature difference of >3 °C between the influent and the liquid in the reactor at 13 °C. Moreover, the flow regime of wastewater in the Unifed SBR was affected by the variation in water density, which may lead to stratification or a density current. Ascribed to the appearance of stratification in the Unifed SBR reactor, the water quality of the effluent could not be affected by that of the influent.
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Research Article|
June 15 2016
Variation in water density related to pollutants removal in wastewater treatment processes and its use in explaining the working principles of the Unifed SBR Available to Purchase
Liancheng Xiang;
Liancheng Xiang
1Department of Urban Water Environmental Research, Chinese Research Academy of Environmental Sciences, Beijing 100012, China and State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China
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Junqi Wu;
Junqi Wu
2Beijing University of Civil Engineering and Architecture, Beijing 100044, China
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Yonghui Song;
1Department of Urban Water Environmental Research, Chinese Research Academy of Environmental Sciences, Beijing 100012, China and State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China
E-mail: [email protected]
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Ruixia Liu;
Ruixia Liu
1Department of Urban Water Environmental Research, Chinese Research Academy of Environmental Sciences, Beijing 100012, China and State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China
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Huibin Yu;
Huibin Yu
1Department of Urban Water Environmental Research, Chinese Research Academy of Environmental Sciences, Beijing 100012, China and State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China
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Qiong Gao;
Qiong Gao
3Beijing Drainage Group Co., Ltd, Beijing 100044, China
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Yingjie Yang;
Yingjie Yang
3Beijing Drainage Group Co., Ltd, Beijing 100044, China
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Yunrong Dai
Yunrong Dai
1Department of Urban Water Environmental Research, Chinese Research Academy of Environmental Sciences, Beijing 100012, China and State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China
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Water Sci Technol (2016) 74 (9): 2010–2020.
Article history
Received:
February 02 2016
Accepted:
June 01 2016
Citation
Liancheng Xiang, Junqi Wu, Yonghui Song, Ruixia Liu, Huibin Yu, Qiong Gao, Yingjie Yang, Yunrong Dai; Variation in water density related to pollutants removal in wastewater treatment processes and its use in explaining the working principles of the Unifed SBR. Water Sci Technol 14 November 2016; 74 (9): 2010–2020. doi: https://doi.org/10.2166/wst.2016.294
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