上海给水污泥协同建筑垃圾再生骨料制免烧砖研究  

Study on the Production of Non-sintered Brick by Shanghai Water Supply Sludge with Recycled Aggregate from Construction and Demolition Debris

作　　者：顾雍 GU Yong(Shanghai Environmental Sanitation Engineering Design Institute Co.Ltd.,Shanghai 200237)

机构地区：[1]上海环境卫生工程设计院有限公司,上海200237

出　　处：《环境卫生工程》2023年第3期55-61,共7页Environmental Sanitation Engineering

摘　　要：给水污泥的高值资源化利用是提升固体废物精细化管理的重要手段。以青草沙水库、金泽水库、陈行水库为水源的3家城镇供水厂的脱水污泥为研究对象,开展了给水污泥协同建筑垃圾再生骨料制免烧砖研究,分析了污泥掺量、污泥含水率、水胶比、污泥成分等影响因素对免烧砖抗压强度的影响,并进行了重金属浸出试验及微观结构分析。结果表明:由季节和污泥来源引起的污泥成分变化影响免烧砖强度,表现为冬季优于夏季,陈行水库最优。最佳物料配比为水泥20%、污泥20%、再生粗骨料25%、再生细骨料35%,其中污泥含水率70%,免烧砖的28 d抗压强度高达15 MPa,强度等级达到GB/T 8239-2014普通混凝土小型砌块中的MU15。扫描电子显微镜分析结果表明,在最优条件下给水污泥-骨料-水泥的结构随养护时间增长变得更加致密、稳定。重金属浸出试验中As的浸出毒性低于GB 5085.3-2007危险废物鉴别标准浸出毒性鉴别中规定的限值,环境安全性达到要求。High value resource utilization of water supply sludge is an important means to improve the fine management of solid wastes.The dewatered sludge from three urban water treatment plants with Qingcaosha reservoir,Jinze reservoir and Chenhang reservoir as the water source was taken as the research object.The experiment of making non-sintered specimen by water supply sludge with recycled aggregate from construction and demolition debris was carried out.The influence of the sludge content,sludge moisture content,water binder ratio,sludge composition and other factors on the compressive strength of non-sintered specimen was studied.And the leaching toxicity of heavy metals and microstructure analysis were also examined.The results showed that the strength of non-sintered specimen was affected by the variation of sludge composition caused by season and sludge source,which showed that winter was better than summer,and Chenhang reservoir had the highest strength among the three.The optimum proportion of materials was 20% of cement,20% of sludge,25% of recycled coarse aggregate,35% of recycled fine aggregate,and the water content of sludge was 70%.The compressive strength of non-sintered specimen curing for 28 days reached 15 MPa,and the strength grade reached MU15 in GB/T 8239-2014 Normal Concrete Small Block.The analysis results of scanning electron microscope(SEM)showed that the structure of sludge-aggregate-cement became denser and more stable with the increase of curing time under the optimal conditions.The leaching toxicity of As in the heavy metal leaching experiment was much lower than the value stipulated in the GB 5085.3—2007 Identification Standards for Hazardous Wastes:Identification for Extraction Toxicity,and the environmental safety met the requirements.

关 键 词：给水污泥 免烧砖 抗压强度 协同利用 微观结构 

分 类 号：X799.1[环境科学与工程—环境工程]