WANGJi-hang,LUWei,ZHUMin,et al.Research on Sewer Sludge Treatment Process and Its Resource Utilization[J].China Water & Wastewater,2022,38(20):20-26.
Research on Sewer Sludge Treatment Process and Its Resource Utilization
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第38卷
Number:
第20期
Page:
20-26
Column:
Date of publication:
2022-10-17
- Abstract:
- The removal of sediment from drainage pipelines will produce a large amount of sewer sludge, and cause a series of pipe network maintenance and environmental problems. Therefore, the treatment and disposal of sewer sludge has been gradually incorporated into the urban planning. The nature and harm of sewer sludge was introduced, and the treatment and disposal technology of sewer sludge was analyzed. Hydraulic elutriation and wet multi-stage separation are the generally used technologies in sewer sludge treatment. Wet multi-stage separation has gradually replaced hydraulic elutriation as the mainstream treatment technology due to its high degree of resource utilization and relatively small water consumption. However, the primary sewer sludge treatment process will lead to the failure of the downstream section to operate normally due to the deposition of urtar-fine grit in the effluent. So, the fine drum screen was added in the second sewer sludge treatment process to remove the organic scum, and then the ultra-fine grit was separated through hydro cyclone + grit separation, which effectively reduced ultra-fine grit deposition and ensured the regular operation of the downstream section. In order to reduce the amount of washing water, a high-efficiency grit trap was introduced into the third-generation sewer sludge treatment process which combined the characteristics of high-efficiency grit trap and air flotation equipment, and could realize the full reuse of about 100% flushing water, and improve the extraction rate of the ultra-fine grit. At the same time, it could be designed as a mobile processing station to facilitate on-site processing and disposal. Finally, the resource utilization of grit was discussed in detail to provide a feasible treatment and disposal scheme for the demander.
Last Update:
2022-10-17