[关键词]
[摘要]
剩余污泥是污水处理过程产生的半固态副产物(含水率高达80%以上),其中结合水和胞内水是污泥脱水的难点,约占总水分的75%。剩余污泥携带大量负电荷、亲水性强和压缩性高等性质是污泥脱水的瓶颈问题。本文阐述了物理法、化学法和生物法预处理剩余污泥的作用机制,总结了各种强化脱水方式存在的问题和各种调理剂强化污泥脱水的效果,新型调理剂丙烷水合物具有强化脱水和循环利用的双重优势,多种调理剂复配调理具有更强的强化剩余污泥深度脱水效果。对比常用的机械脱水设备,综述了机械脱水设备的选型依据。剩余污泥中生物质资源丰富,资源化处置是较有前景的处置方式,文章总结了剩余污泥深度脱水后处理处置方式和资源化利用途径,并对未来的研究方向进行展望,为剩余污泥资源化利用提供参考。
[Key word]
[Abstract]
The remaining sludge is a semi-solid by-product generated in the sewage treatment process (with a water content of over 80%), of which bound water and intracellular water are the difficulties in sludge dewatering, accounting for about 75% of the total moisture. The properties of carrying a large amount of negative charge, strong hydrophilicity, and high compressibility make it a bottleneck in sludge dewatering. This article elaborates on the mechanisms of pretreating residual sludge using physical, chemical, and biological methods, summarizes the problems existing in various enhanced dewatering methods, and the effects of various conditioning agents on enhancing sludge dewatering. The new type of conditioning agent, propane hydrate, has the dual advantages of enhancing dewatering and recycling. The combination of various conditioning agents has a stronger effect on enhancing the deep dewatering of residual sludge. Comparing with commonly used mechanical dewatering equipment, the selection basis of mechanical dewatering equipment is summarized. The residual sludge contains abundant biomass resources, and resource utilization is a promising disposal method. The article summarizes the post-treatment disposal methods and resource utilization pathways for deep dewatered residual sludge, and prospects for future research directions, providing reference for the resource utilization of residual sludge.
[中图分类号]
X705
[基金项目]
吉林省自然科学基金(YDZJ202201ZYTS482);国自然青年基金(52300152);中央高校基本科研业务费项目(2412022ZD055)