摘要
给水厂污泥(drinking water treatment residue, DWTR)是给水处理絮凝(添加铝盐或铁盐)工艺中产生的一种絮凝剂残泥。由于给水厂水质一般较好,所以DWTR相对清洁和安全;脱水后的DWTR表面疏松多孔,具有较大比表面积,且含有较多铁铝氧化物,类似于缺氧条件下天然形成的水铁矿的固体废物,因此,DWTR可以作为一种清洁的固体废物进行回收利用。此外,DWTR对多种环境污染物如磷(P)、多种重(类)金属等有较强的吸附能力,因此,DWTR在作为给水或污水絮凝中回用的絮凝剂、作为基质应用在人工湿地中、作为吸附材料吸附重金属和磷等污染物、作为添加剂修复土壤中的有机农药污染等方面具有广阔的应用前景。在系统总结了DWTR中的金属释放风险和生态风险的基础上,对DWTR应用于水中污染物吸附、土壤和湖(河)底沉积物污染修复和土地利用等方面研究进展进行了归纳,并总结其作用机理,为更好促进DWTR应用于工程实践,实现经济环境效益双赢提供了理论支持。
Drinking water treatment residue(DWTR)is a kind of flocculant residue produced in the flocculation(adding aluminum salt or iron salt)process of water treatment.As the water quality of the water treatment plant is generally good,DWTR is relatively clean and safe;The dewatered DWTR surface is loose and porous,with a large specific surface area,and contains a lot of iron and aluminum oxides,which is similar to the solid waste of naturally formed ferrihydrite under anoxic conditions.Therefore,DWTR can be recycled as a clean solid waste.In addition,DWTR has strong adsorption capacity for a variety of environmental pollutants,such as phosphorus(P)and a variety of heavy metals.Therefore,DWTR has broad application prospects in water supply or sewage flocculation as a flocculant,artificial wetland as a substrate for wastewater purification,the production of heavy metal adsorption materials,and the remediation of organic pesticide pollution.On the basis of systematically summarizing the metal release risk and ecological risk in DWTR,this paper summarizes the research progress of DWTR in water pollutant adsorption,soil and lake(River)bottom sediment pollution remediation and land use,and summarizes its mechanism,which provides theoretical support for better promoting DWTR reuse in engineering practice and achieving win-win economic and environmental benefits.
作者
徐舟影
陈曦
孟发科
黄俊
李开国
班宜辉
XU Zhouying;CHEN Xi;MENG Fake;HUANG Jun;LI Kaiguo;BAN Yihui(School of Civil Engineering and Architecture,Wuhan University of Technology,Wuhan 430070,China;School of Chemistry,Chemistry,Chemical Engineering and Life Science,Wuhan University of Technology,Wuhan 430070,China)
出处
《给水排水》
CSCD
北大核心
2023年第3期140-150,共11页
Water & Wastewater Engineering
基金
国家自然科学基金项目(31800420)
国家级大学生创新创业训练计划项目(201910497089)
中央高校基本科研业务费专项资金资助(2020IB029)
山东省自然科学基金项目(ZR2022MD108,ZR2022MC218)。
关键词
给水厂污泥
再利用风险分析
磷吸附
重金属吸附
DWTR应用
Drinking water treatment residue
Reuse risk assessment
Phosphorus adsorption
Heavy metal adsorption
Application of DWTR
