ZHONGHui-hui,SHENYu-fang,ZIYa,et al.Feasibility of Forward Osmosis Technology for Thickening Waste Activated Sludge[J].China Water & Wastewater,2024,40(5):99-104.
Feasibility of Forward Osmosis Technology for Thickening Waste Activated Sludge
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第40卷
Number:
第5期
Page:
99-104
Column:
Date of publication:
2024-03-01
- Keywords:
- forward osmosis; sludge thickening; waste activated sludge; municipal wastewater; effluent reuse
- Abstract:
- This paper investigated the feasibility of forward osmosis (FO) for thickening waste activated sludge (FST) in long-term operation based on the advantages of FO (such as good pollutant retention performance and resistance to membrane fouling), so as to solve the problems such as low thickening efficiency of sludge and high concentration of pollutants in supernatant of waste activated sludge (WAS) thickening process. When the concentration of WAS was approximately 5 g/L, the mixed liquor suspended solid concentration (MLSS) and mixed liquor volatile suspended solid concentration (MLVSS) of WAS were increased to more than 30 g/L and 12.5 g/L respectively after 13 days of operation, and the goal of WAS concentration was realized. In addition, the effluent quality of the FST process was obviously better than that of the microfiltration membrane thickening process (MST) and traditional gravity thickening process, which met the requirements of direct discharge or reuse as municipal miscellaneous water. Finally, the FST process had slighter membrane fouling than that of the MST process with equivalent thickening efficiency. FST process is capable of realizing simultaneous sludge thickening and safe discharge of sludge supernatant, which has good application potential in the field of WAS thickening in municipal wastewater treatment plants.
Last Update:
2024-03-01