Study of solidification and stabilization effect of heavy metal polluted river sediment
River sediment is prone to contamination from prolonged exposure to pollutants.Desilting is one of the crucial measures of river treatment.The harmless treatment of sludge is useful to prevent secondary pollution.In this study,heavy metal-contaminated sediments from a river in Zhaoqing,Guangdong are selected as the test objects,the solidification/stabilization effect of self-made inorganic solidification materials on heavy metals in sludge is studied by analyzing the leaching concentration and the existing form distribution of heavy metals after solidification.The results indicate that the leaching concentration of heavy metals is significantly reduced after curing,while the curing effect is more obvious as the curing agent content increased and the curing age extendes.The fixation of heavy metals is mainly through the hydration products of the curing agent,such as ettringite and hydrated calcium silicate gels,which absorbed heavy metals and transformed them into an insoluble or stable complexed state.Macroscopically,this is evidenced by an increase in the residual concentration of heavy metals and a reduction in their bioavailability after treatment.
sedimentheavy metalsleaching toxicitysolidification and stabilization
万方数据
维普
