摘要
堆存污泥具有高含水率和潜在重金属污染特征,对堆存填埋场及周边环境可能产生潜在生态风险。以秸秆(SP)、粉煤灰(FA)、磷石膏(PG)3种固体废物材料搭配2种常用脱水剂氧化钙(CaO)、聚合氯化铝(PAC)组成联合调理剂,对堆存污泥进行脱水以及对其中重金属进行稳定化效果研究,并通过电镜-能谱探究加入调理剂后污泥的微观结构及物质构成。结果表明:添加固体废物材料的联合调理剂对污泥脱水及重金属稳定化效果显著,其中添加PG的组合最优。当CaO、PAC、PG添加量(干基比)分别为20%、25%、23%时,毛细吸水时间为42.1 s,泥饼含水率为49.00%;PG中丰富的孔隙结构及磷酸盐物质对重金属有很好的吸附和沉淀作用;微观结构分析显示,经过调理后CaSO_(4)或Al_(2)(SO_(4))_(3)构建了污泥的骨架结构。
The stocked sludge has the characteristics of high moisture content and potential heavy metal pollution,which may pose potential ecological risks to the landfill site and the surrounding environment.Three solid waste materials,straw powder(SP),fly ash(FA)and phosphogypsum(PG),combined with two common dehydrators,quick lime(CaO)and polyaluminium chloride(PAC),were used to dehydrate the stocked sludge and study the stabilization effect of heavy metals.In addition,the microstructure and composition of the dehydrated sludge cake were studied by SEM-EDS.The results showed that the combined conditioner with solid waste materials had significant effects on sludge dewatering and heavy metal stabilization,and the group with PG was the best.When the addition of CaO,PAC and PG(dry basis ratio)were 20%,25%and 23%respectively,the capillary water absorption time was 42.1 s and the moisture content of mud cake was 49.00%.The rich pore structure and phosphate impurities in PG had good adsorption and precipitation effects on heavy metals.The microstructure analysis showed that CaSO_(4)or Al_(2)(SO_(4))_(3)formed the skeleton structure of treated sludge.
作者
吴曰丰
池艳峰
张露
江帅
杨锡刚
赵旭远
WU Yuefeng;CHI Yanfeng;ZHANG Lu;JIANG Shuai;YANG Xigang;ZHAO Xuyuan(Shanghai Laogang Integrated Solid Waste Development Co.,Ltd.;National Engineering Research Center of Dredging Technology and Equipment)
出处
《环境工程技术学报》
CAS
CSCD
北大核心
2023年第1期248-254,共7页
Journal of Environmental Engineering Technology
关键词
堆存污泥
固废材料
深度脱水
重金属稳定化
微观结构
stocked sludge
solid waste materials
deep dewatering
heavy metals stabilization
microstructure
