ZHANGDong-jie,LIXing,YUHai-kuan,et al.Treatment of Production Wastewater from Drinking Water Treatment Plant by Coagulation-Sedimentation/Ultrafiltration Technology and Feasibility of Reuse[J].China Water & Wastewater,2023,39(15):45-50.
Treatment of Production Wastewater from Drinking Water Treatment Plant by Coagulation-Sedimentation/Ultrafiltration Technology and Feasibility of Reuse
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第39卷
Number:
第15期
Page:
45-50
Column:
Date of publication:
2023-08-01
- Keywords:
- drinking water treatment plant; production wastewater; coagulation-sedimentation; ultrafiltration; feasibility of reuse
- Abstract:
- Three processes of coagulation-sedimentation, ultrafiltration and coagulation- sedimentation/ultrafiltration were used respectively for the treatment of mixed production wastewater consisting of sludge discharge wastewater from sedimentation tank, backwashing wastewater from filter, backwashing wastewater from activated carbon tank and backwashing wastewater from ultrafiltration membrane tank in a large drinking water treatment plant in Shandong Province. The removal performance of organic matter, trihalomethane formation potential (THMFP) and membrane fouling characteristics of the processes were investigated, and the reuse feasibility of effluent from the three treatment processes was explored. Coagulation-sedimentation or ultrafiltration process was effective in removing organic matter and THMFP from the mixed production wastewater to varying degrees, and coagulation-sedimentation/ultrafiltration process significantly improved the removal performance of organic matter and THMFP. The coagulation-sedimentation process effectively removed the main substances (soluble proteins and humic-like substances) that led to irreversible membrane fouling, and also had obvious removal performance for DOC with molecular weight (MW) greater than 100 ku, which reduced the irreversible membrane fouling by 49.83% and increased the membrane flux by 4.75 times in subsequent ultrafiltration unit. The ultrafiltration process effectively removed soluble proteins and tryptophan-like aromatic proteins, and efficiently intercepted DOC with MW greater than 100 ku. The coagulation-sedimentation/ultrafiltration process significantly improved the removal efficiency of tryptophan-like aromatic proteins, so that the organic matter in each molecular weight range was more efficiently removed. The effluent from coagulation-sedimentation or ultrafiltration process should be returned to the inlet end of the drinking water treatment for reuse, and the effluent from coagulation-sedimentation/ultrafiltration process should be returned to the inlet end of the ultrafiltration unit or carbon filter unit for reuse.
Last Update:
2023-08-01