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Volume 38 Issue 8
Nov.  2020
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Article Navigation >  ENVIRONMENTAL ENGINEERING  > 2020  >  38(8): 96-100,70
LIAN Guang-hu, CHENG Gang, ZHANG Lin-yu, ZHANG Yu, SONG Zhi-jun, XU Xiao-jie, WEN Yu-ting, CAI Mei-qiang. SLUDGE DEWATERING PERFORMANCE ENHANCEMENT BY HYDRODYNAMIC CAVITATION-ACIDIFICATION CONDITIONING[J]. ENVIRONMENTAL ENGINEERING , 2020, 38(8): 96-100,70. doi: 10.13205/j.hjgc.202008016
Citation: LIAN Guang-hu, CHENG Gang, ZHANG Lin-yu, ZHANG Yu, SONG Zhi-jun, XU Xiao-jie, WEN Yu-ting, CAI Mei-qiang. SLUDGE DEWATERING PERFORMANCE ENHANCEMENT BY HYDRODYNAMIC CAVITATION-ACIDIFICATION CONDITIONING[J]. ENVIRONMENTAL ENGINEERING , 2020, 38(8): 96-100,70. doi: 10.13205/j.hjgc.202008016
shu

SLUDGE DEWATERING PERFORMANCE ENHANCEMENT BY HYDRODYNAMIC CAVITATION-ACIDIFICATION CONDITIONING

doi: 10.13205/j.hjgc.202008016

  • 1. School of Environmental Science and Engineering, Zhejiang Gongshang University, Hangzhou 310018, China;

  • 2. Huangshan City Water Supply Co., Ltd, Huangshan 245000, China

  • Received Date: 2019-06-26
    Abstract
  • The mechanism of hydrodynamic cavitation-acidification conditioning on sludge dewatering was studied. Specific resistance to filtration (SRF), sludge moisture content and capillary sunction time (CST) were the major indicators to evaluate the sludge dewatering performance. The content of polysaccharides and protein in extracellular polymeric substances (EPS) were determined, and sludge acidification extent and sludge electron microscopic image was analyzed at the same time. The results showed that the moisture content and SRF of the sludge decreased from 83.1% and 5.12×1011 m/kg, to 69.8% and 2.41×1011 m/kg, respectively, and the CST time decreased from 50 s to 20.8 s. The content of each EPS component decreased significantly. The acidification changed the dewatering property of the sludge by affecting the polysaccharide and protein content in the S-EPS and LB-EPS of the sludge. The sludge had the best dewatering effect at pH=3. In summary, hydrodynamic cavitation-acidification conditioning could greatly enhance the dewatering performance of sludge, and had great application value in practical engineering.
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