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Volume 40 Issue 12
Nov.  2022
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Article Navigation >  ENVIRONMENTAL ENGINEERING  > 2022  >  40(12): 71-78
DONG Xinlei, LIN Qingshan, LIN Yanan, XI Shihao, CHENG Boyi, CHEN Lei, ZHANG Da, WANG Zongping, GUO Gang. EFFECTS OF ELECTROLYTES ON ACIDOGENIC FERMENTATION OF WASTE ACTIVATED SLUDGE FOR VOLATILE FATTY ACIDS PRODUCTION VIA ELECTROCHEMICAL PRETREATMENT[J]. ENVIRONMENTAL ENGINEERING , 2022, 40(12): 71-78. doi: 10.13205/j.hjgc.202212010
Citation: DONG Xinlei, LIN Qingshan, LIN Yanan, XI Shihao, CHENG Boyi, CHEN Lei, ZHANG Da, WANG Zongping, GUO Gang. EFFECTS OF ELECTROLYTES ON ACIDOGENIC FERMENTATION OF WASTE ACTIVATED SLUDGE FOR VOLATILE FATTY ACIDS PRODUCTION VIA ELECTROCHEMICAL PRETREATMENT[J]. ENVIRONMENTAL ENGINEERING , 2022, 40(12): 71-78. doi: 10.13205/j.hjgc.202212010
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EFFECTS OF ELECTROLYTES ON ACIDOGENIC FERMENTATION OF WASTE ACTIVATED SLUDGE FOR VOLATILE FATTY ACIDS PRODUCTION VIA ELECTROCHEMICAL PRETREATMENT

doi: 10.13205/j.hjgc.202212010

  • 1. Huazhong University of Science and Technology School of Environment Science & Engineering, Wuhan 430074, China;

  • 2. China Railway Siyuan Survey and Design Group Co., Ltd, Wuhan 430074, China

  • Received Date: 2022-03-19
    Available Online: 2023-03-23
    Abstract
  • Anaerobic fermentation (AF) of waste activated sludge (WAS) via electrochemical pretreatment (EPT) is a practical, effective and cost-saving protocol for volatile fatty acids (VFAs) production. However, AF performance is significantly affected by the different electrolytes during EPT. This study aimed to investigate the effects of different types of electrolytes (Control, NaCl, Na2SO4 and CaCl2) on VFAs production from AF of WAS via EPT with a current intensity at 1 A for 60 min. The results showed that by using 0.05 mol/L NaCl as the electrolyte during EPT, the amount of organic matter released from WAS, such as soluble COD, glycogen, protein etc., was the highest compared to other electrolytes. Thus the maximal VFAs accumulation during AF via EPT by using NaCl as the electrolyte reached 2625.8 mg COD/L, which was 51.6% higher than that of the control. These results indicated that EPT with NaCl as the electrolyte could effectively improve the hydrolysis of WAS, increase the amount of organic matter released from WAS and promote the enrichment of anaerobic fermentative bacteria (such as Firmicutes and Bacteroidetes). All of these subsequently promoted the AF of WAS and thus increased VFAs production, which in turn enhanced the resource recovery from WAS treatment.
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