Journal of Environmental Engineering Technology ›› 2018, Vol. 8 ›› Issue (4): 420-428.doi: 10.3969/j.issn.1674-991X.2018.04.055

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Analyses on pollutants removal in municipal wastewater reclamation plant with multistage A/O process

LI Tongtong1,2(),LI Yingjun3,XU Jianfeng2,4,XI Beidou2,LÜ Ningqing2,LIU Hui2,WANG Jinsheng5,ZHANG Lieyu2,WANG Lei2()   

  1. 1. College of Resource Environment and Tourism, Capital Normal University, Beijing 100048, China
    2. Groundwater and Environmental System Engineering Innovation Base, State Environmental Protection Key Laboratory of Simulation and Control of Groundwater Pollution, Chinese Research Academy of Environmental Science, Beijing 100012, China
    3. Beijing Vocational College of Agriculture, Beijing 100012, China
    4. School of Environmental and Chemical Engineering, Shanghai University, Shanghai 200444, China
    5. Shenzhen Long Cheng High-tech Environmental Protection Co., Ltd., Shenzhen 518063, China
  • Received:2018-01-18 Online:2018-07-20 Published:2018-07-20

Abstract:

A municipal wastewater treatment plant(MWWTP) in Beijing City based on the traditional A 2/O process was added with multi-stage A/O(MAO) to enhance the nitrogen and phosphorus removal effect. The effluent from different units of the MWWTP was studied, and the removal effects of the pollutants in the wastewater especially for dissolved organic matter(DOM) by the enhanced process were analyzed, by analyzing the basic water quality indicators, ultraviolet absorption spectrum and related parameters, and combined with multi-variate statistic analysis. After treatment of the MAO-enhanced process, the average removal rate of chemical oxygen demand, dissolved organic carbon, total nitrogen, total phosphorus, ammonia nitrogen were 95.14%, 89.70%, 94.53%, 97.26%% and 99.74%, respectively, which met first class A of Urban Sewage Treatment Plant Pollutant Discharge Standards(GB 18918-2002). With the addition of multi-stage A/O units, the removal rate of DOM was increased. At the same time, the molecular weight of DOM and the degree of agglomeration increased significantly; the stability of the compounds increased. The correlation analysis of water quality index and ultraviolet fluorescence spectrum shows that the removal of nitrogen and phosphorus is more obvious when the type of substituent is mainly aliphatic chain in the aromatic ring.

Key words: multistage anoxic/oxic(MAO), removal of nitrogen and phosphorus, municipal wastewater, reclamation, dissolved organic matter(DOM), low carbon source

CLC Number: 

  • X703