Study On Stabilizing Heavy Metals In Soil By Solid Waste Of Biomass Power Plant

China is a large agricultural country in the world,and the annual output of crop straw is about 1 billion tons.At present,a large number of crop straws are used for power generation.After power generation,the comprehensive utilization of solid waste is less and most of them is abandoned.In this paper,a biomass power plant slag,dust collector collected fly ash and lignin as the research object,study on the effect of three substances on the stabilization of lead and cadmium in soil,to explore the influence of different pH value of solution and different dosages of stable materials on the adsorption effect of lead and cadmium,furthermore,the effect of fly ash collected from slag and dust collector of biomass power plant on available lead and cadmium in soil are studied,the microcosmic characteristics of the stable materials are analyzed,and the modification experiments of biomass battery slag are carried out.The main conclusions are as follows:(1)The adsorption capacity of biomass power plant slag,fly ash collected by bag dust collector,lignin to lead and cadmium gradually increases with the increase of pH.The adsorption capacity of cadmium increases rapidly when the pH is 5 to 6,and increases relatively slowly after the pH exceeds 6.the adsorption capacity of lead increases rapidly when the pH is 3 to 4,and increases relatively slowly after the pH exceeds 4.(2)When the three stable materials are used alone,the comprehensive stabilization capacity of lead and cadmium is in order of biomass power plant slag>fly ash collected by bag dust collector> lignin.The stabilization effect of biomass power plant slag on heavy metals lead and cadmium continues to improve with the increase of dosage and stable time.There is an exponential relationship between the slag stabilization of lead and cadmium.The ratio of the fly ash collected by the biomass power plant slag to the bag dust collector is 2: 1,which can significantly improve the stable effect of lead and cadmium.The stable rate of cadmium is 91.1%,and the stable rate of lead is 85.6%.(3)The specific surface area of the three kinds of stable materials is in order of the fly ash and lignin collected by the biomass power plant slag,bag dust collector.The CEC value of the modified biomass power plant slag increased to 95.73 cmol /kg,and the stabilization rates of effective cadmium and effective lead in the soil were increased by 4% and 7.6%,respectively.There are 49 figures,14 tables and 83 references in this paper.