Study On The Solidification Effect Of Different Solidifying Agents On River Sediment

With the continuous development of China's environmental protection cause,the issue of black and odor river management has received increasing attention.River channel sediment is an important source of pollution for black and odorous water bodies,and the problem is becoming more serious.The problem of the treatment of river sediment has gradually become one of the environmental problems that need to be solved in China.In this study,local soil brown soil was added on the basis of conventional curing agent cement and lime.The curing effect and solidification mechanism of the above three materials combined with river channel sediment were discussed.By measuring and analyzing the concentration of heavy metals in the sediment leaching solution after solidification,the concentration of heavy metals in the leaching filtrate,the curing strength and the change of heavy metals after solidification,the influence of different curing treatments on the environment and the feasibility of re-use after curing are analyzed.The curing effect is studied simultaneously with the curing mechanism,and the most economical and practical curing agent combination is selected from different curing agent combinations.The results are listed as follows:1.Compared with the control group,the concentration of heavy metals in the leachate of the sediment leaching solution after the addition of the curing agent was greatly reduced.The concentration of heavy metals in the leachate and leachate of each treatment is lower than the national standard.2.After the addition of the curing agent,the heavy metals in the sediment are mostly present in a residual state.Unstable state: The proportion of exchangeable and carbonate-bound states is significantly reduced.In each treatment,sediment: lime: local soil =100:6:15 treatment 9 Curing Cu,Cd,Zn,Pb,Cr 5 heavy metals have the highest residual state,which is more conducive to the stability of heavy metals in the sediment.3.After adding a curing agent,the strength of the sediment can be increased.In the case of the same amount of cement and lime added,the addition of local soil can increase the solidification strength of the sediment;when the sediment: cement: lime: local soil ratio is100:12:8:10,the solidification strength of the sediment is the largest,and It is beneficial to the multi-purpose utilization of river sediment as a raw material for producing ceramsite.4.Adding local soil to the use of cement and lime to cure the river sediment can improve the curing strength,reduce the curing cost to a certain extent,and reduce the economic cost.At the same time,the impact on the surrounding environment is small.Combined with this experiment,it can be seen that the addition of local brown soil as a means of repairing river sediment on the basis of cement and lime can effectively reduce the activity of heavy metals in the river sediment,and at the same time reduce the repair funds to a certain extent.