循环经济背景下污水厂污泥中铝盐的分离与回收技术研究进展  

RESEARCH PROGRESS ON SEPARATION AND RECOVERY OF ALUMINUM COAGULANTS FROM WASTEWATER SLUDGE IN THE CONTEXT OF CIRCULAR ECONOMY

作　　者：樊瑜 华煜 杨东海 戴晓虎[1] FAN Yu;HUA Yu;YANG Donghai;DAI Xiaohu(State Key Laboratory of Pollution Control and Resource Reuse,College of Environmental Science and Engineering,Tongji University,Shanghai 200092,China)

机构地区：[1]同济大学环境科学与工程学院污染控制与资源化研究国家重点实验室,上海200092

出　　处：《环境工程》2023年第9期210-220,共11页Environmental Engineering

基　　金：国家自然科学基金(52131002,52200172);上海市科学技术委员会项目(22DZ1209200,21YF1412200)。

摘　　要：污泥资源化是我国解决资源与环境问题、实现减污降碳的重要举措。污泥中铝盐组分的回收和循环利用是推动污水处理厂绿色发展的有效措施,也是同步提高污泥中磷、有机质等资源高效回收的重要途径。综述了铝系混凝剂在污水污泥中的物质流向和反应机制;基于污泥中铝盐的赋存形态分析,以铝盐释放-分离-回用的技术路线为核心,全面回顾了污泥中铝盐回收的相关技术与研究现状,探讨了其对磷回收的影响。重点分析了铝盐的多种分离技术,以克服污泥中磷、重金属在酸性条件下共溶的障碍,包括顺序沉淀、离子交换树脂、液液萃取、硫化物沉淀、Donnan膜以及电渗析工艺。提出了铝盐与磷的联合回收工艺,针对污泥中铝盐回收现状及问题,展望了铝盐回收效率进一步提高、全链条经济效益及铝盐混凝剂循环利用综合评估等热点研究方向,旨在推动构建资源化水平更高、更符合循环经济模式的污水及污泥处理系统。Sludge resource utilization is an important measure in China to solve resource and environmental problems and reduce pollution and carbon.Recovering and recycling aluminum salt components in sludge is an effective way to promote the green development of wastewater treatment plants.This article introduced the material flow and reaction mechanism of aluminum coagulants;based on the analysis of the occurrence form of aluminum salts in sludge,the related technologies and research status of aluminum recovery in sludge were comprehensively reviewed,with the technical scheme of release-separation-reuse of aluminum salts as the core,and its impacts on phosphorus recovery were also discussed.A variety of separation technologies of aluminum salts,which aimed to overcome the obstacles of phosphorus and heavy metals co-dissolving under acidic condition,were emphatically analyzed,including sequential precipitation,ion exchange resin,liquid-liquid extraction,sulfide precipitation,Donnan membrane,and electrodialysis process.A joint recovery process for aluminum salts and phosphorus was constructed according to the above analysis.In view of the current situation and problems of aluminum salts recovery in sludge,potential research directions,including improving aluminum salts recovery efficiency,analyzing the full chain economic benefits,and evaluating the effectiveness of aluminum salts coagulant recycling were proposed,aiming to promote the construction of sewage and sludge treatment systems with higher resource utilization levels and better accordance with the circular economy context.

关 键 词：污水污泥 铝盐回收 磷回收 资源化 技术选择 

分 类 号：X703[环境科学与工程—环境工程] TU992.3[建筑科学—市政工程]