摘要
为考察介质加载混凝过程中污染物去除特征与探讨混凝机理,考察了不同形态的磷和溶解性有机物(DOM)的变化,并结合混凝絮体粒径与形貌,分析了介质加载的混凝机理。结果表明:溶解性污染物主要去除机制为聚合氯化铝(PAC)水解产物的吸附和螯合作用,高芳香性、腐殖化和分子质量为4000~50000 Da的DOM去除率较高;石英砂可强化去除悬浮态磷及腐殖酸类DOM;磁种可强化有机磷、PO4^3--P和DOM的去除效果;回收磁种的微絮体结构使其对磷与大分子DOM具有更好的去除效果。介质加载混凝过程的关键作用在于形成密实性絮体,从而增强了絮体的强度和沉降性能,实现了污泥减量。研究结果可为介质加载混凝在水处理中的推广应用提供参考。
To understand the pollutants removal feature during medium-loaded coagulation and the corresponding coagulation mechanism,the variations of different forms of phosphorus and dissolved organic matter(DOM)were investigated in this work,in combination of flocs size and morphology,the corresponding coagulation mechanism were also discussed.The results showed that the adsorption and chelation of PAC hydrolysate mainly contributed to the removal of dissolved pollutants,and the DOM with high aromaticity,humification degree,and molecular weight(MW)of 4000~50000 Da presented higher removal rates than others.The silica sand enhanced the removal of suspended phosphorus and humic acid-like DOM.The magnetic seeds enhanced the removal of organic phosphorus,phosphate,and DOM.Due to their micro-floc structure,the recycled magnetic seed showed better removal effect toward phosphorus and DOM with high MW.The key for medium-loaded coagulation was the formation of compact flocs with enhanced strength and settleability,and the sludge volume reduction could be achieved.The result in this work provides reference for the generalization and application of medium-loaded coagulation in water and wastewater treatment.
作者
郑利兵
吴振军
张鹤清
黄光华
焦赟仪
张春
魏源送
ZHENG Libing;WU Zhenjun;ZHANG Heqing;HUANG Guanghua;JIAO Yunyi;ZHANG Chun;WEI Yuansong(Laboratory of Water Pollution Control Technology,Research Center for Eco-Environmental Sciences,Chinese Academy of Sciences,Beijing 100085,China;State Key Joint Laboratory of Environment Simulation and Pollution Control,Research Center for Eco-Environmental Sciences,Chinese Academy of Sciences,Beijing 100085,China;SCIMEE Technology&Science Co.Ltd.,Chengdu 610045,China)
出处
《环境工程学报》
CAS
CSCD
北大核心
2020年第12期3352-3362,共11页
Chinese Journal of Environmental Engineering
基金
国家水体污染控制与治理科技重大专项(2017ZX07102-002)
国家自然科学基金青年基金资助项目(51908539)。
关键词
磷
溶解性有机物
介质加载混凝
混凝机理
磁种
phosphorus
DOM
medium-loaded coagulation
coagulation mechanism
magnetic seed
