WANXiao,SHAOWen-xin,GUOYi-ling.Effect of COD/SO42- on Anaerobic Treatment of Low Concentration Organic Wastewater Containing Sulfate[J].China Water & Wastewater,2023,39(21):1-6.
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Effect of COD/SO42- on Anaerobic Treatment of Low Concentration Organic Wastewater Containing Sulfate

China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU] volume: 第39卷 Number: 第21期 Page: 1-6 Column: Date of publication: 2023-11-01
Author(s):
WAN　Xiao1;  SHAO　Wen-xin2;  GUO　Yi-ling3
（1. Pingdu Urban Construction Service Center， Qingdao 266799， China； 2. Central & Southern China Municipal Engineering Design and Research Institute Co. Ltd.， Wuhan 430010， China； 3. School of Environmental and Municipal Engineering， Qingdao University of Technology， Qingdao 266033， China）
Keywords:
low concentration organic wastewater containing sulfate;  anaerobic digestion;  EGSB reactor;  COD/SO42-;  methanogens;  sulfate reducing bacteria
Abstract:
The expanded granular sludge bed (EGSB) reactor was used to treat low concentration organic wastewater containing sulfate, and the removal rule of COD and SO42- was investigated under different influent COD/SO42- conditions. The results showed that the influent COD/SO42- has two stages of increasing and decreasing effect on the removal rate of COD and reduction rate of SO42-. When COD/SO42- was 15, the COD removal rate was about 65%, and the SO42- removal rate was above 80%. When COD/SO42- was 7, the removal effect was the best. The effluent COD was less than 450 mg/L, and the removal rates of COD and SO42- were more than 75% and 85% respectively. When COD/SO42- was 4, the removal rates of COD and SO42- decreased to below 65% and 75% respectively. This study shows that in the anaerobic treatment of low concentration organic wastewater, the presence of an appropriate amount of sulfate can make methanogens and sulfate reducing bacteria metabolize the organic matter synergistically, so as to improve the removal effect of COD in the reactor.
Last Update: 2023-11-01