摘要
针对东莞市东引运河流域松山湖片区底泥重金属污染严重、传统处置技术二次污染风险高的问题,提出“筛分-机械脱水-固化稳定化”的集成工艺链。通过投加IR+CMC(质量比为9.5%∶0.5%)复配药剂,实现铬浸出浓度降低57%~93%(<100μg/L);研发多级压滤协同脱水系统,使泥饼含水率降至40%以下。工程应用实践表明,67×10^(4) m^(3)污染底泥经处理后,70%转化为绿化种植土(有机质≥5%)和工程回填土(承载力≥80 kPa),沙料资源化率18.7%,尾水回用率达100%。技术经济分析显示,该工艺相较传统填埋法处理成本降低30%,节约土地资源20%~30%。
To address severe heavy metal contamination in sediment from the Songshan Lake area of Dongyin canal basin in Dongguan and the high secondary pollution risks of traditional disposal methods,this study proposes an integrated process chain of screening-mechanical dehydration-solidification and stabilization.By adding a compound reagent(IR+CMC,mass ratio 9.5%∶0.5%),chromium leaching concentration was reduced by 57%-93%(<100μg/L).A multi‑stage pressure filtration system was developed to lower the moisture content of dewatered sludge cakes to below 40%.Engineering applications demonstrated that 670000 m^(3)of contaminated sediment was treated,with 70%converted into greening soil(organic matter≥5%)and engineering backfill soil(bearing capacity≥80 kPa),achieving an 18.7%sand resource recovery rate and 100%tailwater reuse.Technical-economic analysis revealed a 30%reduction in treatment costs compared to traditional landfilling,along with 20%-30%land resource savings.
作者
李福畴
孙先锋
张志刚
刘文生
LI Fu‑chou;SUN Xian‑feng;ZHANG Zhi‑gang;LIU Wen‑sheng(Guangzhou Resource Environmental Protection Technology Co.Ltd,.Guangzhou 510699,China;North China Municipal Engineering Design&Research Institute Co.Ltd.,Tianjin 300020,China;Dongguan Guangshuili Engineering Consulting Co.Ltd.,Dongguan 523000,China)
出处
《中国给水排水》
北大核心
2025年第18期112-117,共6页
China Water & Wastewater
关键词
河道淤泥
固化稳定化
重金属污染
资源化利用
无废城市
river silt
solidification and stabilization
heavy metal contamination
resource utilization
zero‑waste city
