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.
通沟污泥处理工艺及其资源化利用研究
- Title:
- Research on Sewer Sludge Treatment Process and Its Resource Utilization
- 摘要:
- 对排水管道沉积物的清捞会产生大量通沟污泥，并引起一系列管网维护与环境问题。因此，通沟污泥的处理处置逐渐被纳入各城市规划中。介绍了通沟污泥的性质和危害，分析了通沟污泥处理处置技术。通沟污泥处理技术一般包括水力淘洗和湿式多级分离两种，由于后者资源化利用程度高，用水量相对较小，逐步取代前者成为主流处理技术。然而第一代通沟污泥处理工艺因尾水中超细砂沉积而易导致下游工段不能正常运行。为此第二代通沟污泥处理工艺增加精细格栅对有机浮渣进行去除，再通过旋流+砂分离对超细砂进行分离，有效解决了超细砂沉积问题，保障了下游工段的正常运行。为了减少冲洗水用量，第三代通沟污泥处理工艺引入高效沉砂池，结合高效沉砂池和气浮的特点，可实现约100%冲洗水全回用，并提高了超细砂的提取率；同时可设计成移动式处理站，方便现场处理处置。最后，详细探讨了砂的资源化利用问题，旨在为需求方提供一套可行的处理处置方案。
- 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.
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