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Volume 39 Issue 6
Jan.  2022
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Article Navigation >  ENVIRONMENTAL ENGINEERING  > 2021  >  39(6): 15-20
XIE Min, WU Xin, WANG Xiao, XU Su, XIAO Ben-yi, GUO Xue-song. OPTIMIZATION ON EXCESS SLUDGE DEWATERING OF RURAL DISPERSED WASTEWATER TREATMENT FACILITIES[J]. ENVIRONMENTAL ENGINEERING , 2021, 39(6): 15-20. doi: 10.13205/j.hjgc.202106003
Citation: XIE Min, WU Xin, WANG Xiao, XU Su, XIAO Ben-yi, GUO Xue-song. OPTIMIZATION ON EXCESS SLUDGE DEWATERING OF RURAL DISPERSED WASTEWATER TREATMENT FACILITIES[J]. ENVIRONMENTAL ENGINEERING , 2021, 39(6): 15-20. doi: 10.13205/j.hjgc.202106003
shu

OPTIMIZATION ON EXCESS SLUDGE DEWATERING OF RURAL DISPERSED WASTEWATER TREATMENT FACILITIES

doi: 10.13205/j.hjgc.202106003

  • 1. School of Hydraulic Engineering, Changsha University of Science and Technology, Changsha 410114, China;

  • 2. Key Laboratory of Water-Sediment Sciences and Water Disaster Prevention of Hunan Province, Changsha 410114, China;

  • 3. Engineering and Technical Center of Hunan Provincial Environmental Protection for River-Lake Dredging Pollution Control, Changsha 410114, China;

  • 4. Research Center of Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China;

  • 5. University of Chinese Academy of Sciences, Beijing 100049, China

  • Received Date: 2020-04-28
    Available Online: 2022-01-18
    Abstract
  • The dewaterability of excess sludge from wastewater treatment facilities in rural areas was investigated, and single factor and comprehensive experimental methods were used to optimize the condition of the sludge with single and compound chemicals. Meanwhile, the stirring parameters were further optimized by applying response surface methods. The experimental results showed the variation dewaterability of the excess sludge between different rural wastewater treatment facilities was quite different. Both single and compound conditioners could significantly reduce the capillary suction time(CST) of sludge and improve the sludge dewatering. The optimization results showed that the suitable stirring speed and stirring time could further reduce the CST of sludge. The best combination was polyaluminium chloride(PAC) and polyacrylamide(PAM), when the first stirring speed and time were 500 r/min and 0.5 min, and the second stirring speed and time were 150 r/min and 10 min, sludge CST value reached 10.1. Additionally, the total cost of the conditioning was equal to RMB 10.69/ton wet sludge with moisture content of 98%.
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