ZHANGWei,WU Bao-li,MAHuan-mei,et al.Effect of Inflow Mixing of Highly Oxidizing Effluent from WWTP on Pollutant Attenuation[J].China Water & Wastewater,2024,40(9):14-19.
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Effect of Inflow Mixing of Highly Oxidizing Effluent from WWTP on Pollutant Attenuation

China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU] volume: 第40卷 Number: 第9期 Page: 14-19 Column: Date of publication: 2024-05-01
Author(s):
ZHANG　Wei1; 2;  WU Bao-li1; 2;  MA　Huan-mei1; 2;  SUN　Yong-li1; 2;  LI　Mai1;  GU　Miao1;  WANG　Yi-da1;  TIAN　Teng-fei1;  MI　Xin-hao1
（1. North China Municipal Engineering Design & Research Institute Co. Ltd.， Tianjin 300074， China； 2. Tianjin Key Laboratory of Urban Drainage System， Tianjin 300074， China）
Keywords:
highly oxidizing effluent;  inflow mixing;  pollutant concentration;  dilution attenuation;  oxidation attenuation
Abstract:
Taking the effluent from wastewater treatment plant (WWTP) and the raw domestic sewage as the research object, the redox characteristics and the attenuation laws of organic matter, nitrogen and phosphorus concentration before and after the mixture were studied. The results showed that the concentrations of COD，BOD5，TN，NH3-N，TP and PO43- in domestic sewage decreased rapidly due to the dilution after mixing the effluent of WWTP with the domestic sewage at a ratio of 1∶1, which basically followed the physical dilution law. After mixing for four hours, BOD5 decayed rapidly again, and the net decay ratio and net decay rate of 10 h were 36.54% and 4.12 mg/(L·h), respectively. The analysis showed that dilution was the primary reason for the concentration attenuation of pollutants. The oxidizing substances in the effluent of WWTP could facilitate the rapid proliferation of microorganisms, and then promote the redox reaction, which was the key to the further attenuation of BOD5.
Last Update: 2024-05-01