膨润土、煤渣在稳定底泥中对上覆水体及底泥pH-Eh-COD的影响  

EFFECTS OF CAPPING CALCIUM BENTONITE AND CINDER ON pH-Eh-COD IN SEDIMENT AND ITS OVERLYING WATER EXPLORED BY IN-SITU SEDIMENT TREATMENTS

作　　者：章萍[1,2] 王天琪 钱光人[2] 周文斌[1] 万金保[1] 

机构地区：[1]教育部鄱阳湖生态与生物资源利用实验室南昌大学环境科学与工程学院,江西南昌330047 [2]上海大学环境与化学工程学院,上海200072

出　　处：《长江流域资源与环境》2014年第3期422-426,共5页Resources and Environment in the Yangtze Basin

基　　金：国家高技术研究发展计划项目(863计划)(2005AA60101005)“受纳湖湾污染负荷有效削减和生态系统重建技术研究与工程示范”;南昌大学鄱阳湖环境与资源利用教育部重点实验室开放基金项目(13005869);南昌大学测试基金项目(2012035)

摘　　要：采用静态模拟试验，选取膨润土、煤渣为帽封材料，研究两者覆盖于河水底泥表层后各体系上覆水体及底泥的pH、氧化还原电位（Eh）、有机含量指标在60d的变化情况。结果表明：底泥表层覆盖膨润土或煤渣后，上覆水体中的pH约为7．5，Eh在80～110mV波动，均未造成持久严重的影响；同时由于它们的吸附性能使得上覆水体CODn在反应周期里有所减少。膨润土存在体系，其底泥pH在反应周期里呈下降趋势，Eh呈上升趋势，底泥有机质去除率在25％左右。而煤渣帽封于底泥上，其底泥pH、Eh在反应周期里均呈上升趋势，底泥有机质去除率约为19％。The effect of different capping methods on pH,Eh and organic content in the overlying water and sediment in 60 days was studied by using calcium bentonite or cinder as capping material for in-situ sediment treatment. As capping materials in sediment in-situ treatment, both cinder and bentonite could isolate sediment organic from overlying water, with bentonite displaying better effects than cinder. This could be seen from the reduction of organic content in the sediment by 25 %.Moreover,the pH of sediment had the tendency to decrease in the reaction system,adhering to the order of pH changes in an anaerobic environment,with a pH of ca. 7.5, while Eh tended to increase even though the sediment was still in an anaerobic environment according to tested data, between 80- t10 inV. On the other hand, after capping with cinder,organic content of sediment was reduced by 20%; pH or Eh tended to increase in the system. After capping with cinder or bentonite, due to their capping isolation and absorption of organic,the CODer released by overlying water was reduced.

关 键 词：原地稳定化 底泥 上覆水体 帽封 

分 类 号：X52[环境科学与工程—环境工程]