重金属污染疏浚底泥免烧生态砖资源化及污染控制研究  

Resource utilization and pollution control of baking-free ecological brick from heavy metal contaminated sediment

作　　者：田久晖 程华强 赵旭远 刘功勋[3] 沈智超 TIAN Jiuhui;CHENG Huaqiang;ZHAO Xuyuan;LIU Gongxun;SHEN Zhichao(Wuhan Bridge Engineering Co.,Ltd.,Wuhan 430061,China;Wuhan Municipal Construction Group Co.,Ltd.,Wuhan 430023,China;National Engineering Research Center of Dredging Technology and Equipment,Shanghai 200120,China)

机构地区：[1]武汉市桥梁工程有限公司,湖北武汉430061 [2]武汉市市政建设集团有限公司,湖北武汉430023 [3]疏浚技术装备国家工程研究中心,上海200120

出　　处：《化工环保》2024年第6期893-899,共7页Environmental Protection of Chemical Industry

基　　金：住房和城乡建设部科技示范项目(S20200338)。

摘　　要：以重金属污染疏浚底泥为原料制备了免烧生态砖,考察了制备条件对其性能的影响,并通过重金属浸出浓度以及XRD和SEM技术分析了重金属污染控制效果和强度形成机理。结果表明:在疏浚底泥掺量(w)40%、中粗砂掺量15%、胶凝材料掺量45%(水泥和生石灰相对掺量85∶15)、水固比12%(w)、成型压力10 MPa的最优条件下,制得的免烧生态砖抗压强度为19~21 MPa,吸水率为15.0%~16.0%,软化系数为0.90~0.95,满足《非烧结垃圾尾矿砖》(JC/T 422—2007)中的MU15标准;重金属Cu、Pb、Ni的浸出质量浓度分别为0.032,0.089,0.022 mg/L,远低于《危险废物鉴别标准浸出毒性鉴别》(GB 5085.3—2007)中的标准值。以重金属污染疏浚底泥制备免烧生态砖,在实现资源化的同时也实现了重金属的固化和稳定化。Baking-free ecological bricks were prepared with heavy metal contaminated sediment as the raw material.The influence of preparation conditions on their properties was investigated,and the pollution control effect and strength formation mechanism were analyzed through heavy metal leaching concentration,XRD,and SEM techniques.The results show that the compressive strength,water absorption rate and softening coefficient of baking-free ecological bricks are 19-21 MPa,15.0%-16.0%and 0.90-0.95,respectively,under the optimal parameters of dredging sediment addition(w)of 40%,medium coarse sand addition of 15%,cementitious materials addition of 45%(relative cement and quicklime content of 85∶15),water solid ratio of 12%(w),and molding pressure of 10 MPa.The baking-free ecological bricks meet the MU15 grade standard in JC/T 422—2007.The leaching concentrations of Cu,Pb,and Ni,are 0.032,0.089,and 0.022 mg/L,respectively,much lower than the standard values in the national standard of GB 5085.3—2007.The preparation of baking-free ecological bricks from heavy metal contaminated sediment not only achieves resource utilization but also solidifies and stabilizes heavy metals.

关 键 词：免烧生态砖 重金属污染 抗压强度 吸水率 污染控制 

分 类 号：X705[环境科学与工程—环境工程]