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Volume 39 Issue 5
Jan.  2022
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Article Navigation >  ENVIRONMENTAL ENGINEERING  > 2021  >  39(5): 9-15
LIU Junwu, CAI Jingju, FANG Yingchun, CAO Jingxiao, ZHU Jian, WANG Ping, JIANG Xiaxin, ZHU Shanshan, ZHANG Jinjin. SYNCHRONOUS REMOVAL OF MOISTURE AND ORGANIC POLLUTANTS IN DREDGING SEDIMENT BY ELECTRO-FENTON[J]. ENVIRONMENTAL ENGINEERING , 2023, 41(6): 76-81,108. doi: 10.13205/j.hjgc.202306011
Citation: GU Xiao-dan, HUANG Yong, DING Yong-wei, HUANG Ji-hui. DIAGNOSIS AND ANALYSIS BASED ON MATHEMATICAL MODEL ON PROBLEMS IN SEWAGE TREATMENT PLANTS IN VILLAGES AND TOWNS WITH LOW LOAD OPERATION[J]. ENVIRONMENTAL ENGINEERING , 2021, 39(5): 9-15. doi: 10.13205/j.hjgc.202105002
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DIAGNOSIS AND ANALYSIS BASED ON MATHEMATICAL MODEL ON PROBLEMS IN SEWAGE TREATMENT PLANTS IN VILLAGES AND TOWNS WITH LOW LOAD OPERATION

doi: 10.13205/j.hjgc.202105002

  • 1. School of Environmental Science and Engineering, Suzhou University of Science and Technology, Suzhou 215009, China;

  • 2. Suzhou Water Group Co., Ltd, Suzhou 215001, China;

  • 3. Suzhou Drainage Company Limited, Suzhou 215001, China

  • Received Date: 2020-08-11
    Available Online: 2022-01-17
    Abstract
  • The problems of low influent flow and concentration generally existed in sewage treatment plants in villages and towns in China, which led to the poor operation stability of sewage treatment plants in villages and towns. In order to prevent the low load operation from affecting treatment performance, taking the inverted AAO process of multiple points in the sewage treatment plant in villages and towns near Taihu Lake as the research object, based on mathematical model, a dynamic response model of sewage treatment plant was established. With mathematical simulation as the main research method and experiment as the supplementary method, the simulation results showed that aeration was excessive in summer, and then MLVSS/MLSS was 0.37. The results of the experiment showed that the influent ISS concentration was 57~92 mg/L, ISS/SS was 0.71~0.82 and ISS/COD was 0.50~0.84. The ISS particle size entered AAO system ranged from 36 μm to 52 μm. Small particle sized ISS was the main reason for low MLVSS/MLSS in the activated sludge. By optimizing influent ISS/COD, sludge retention age, returned sludge ratio and aeration velocity, the effluent quality reached grade A in standard GB 18918-2002 stably, sludge activity was increased to 0.7, and aeration cost was reduced by about 10%.
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