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

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60 d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80~110 mV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CODCr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%

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

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 80-110 mV.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 CODCr released by overlying water was reduced