Environmental Fate And Cumulative Model Of Typical Heavy Metal In Soil Surrounding Municipal Solid Waste Incineration Plant

With the development of the times and our quality of life,which also has brought the living garbage increasing,and it has become a prominent problem in modern society.Thanks to the development of technology,the incineration technology has been widely used,which is convenient for us to deal with garbage.But the waste incineration in the factories also bring exhaust emissions that have an impact on the surrounding environment.Because the domestic waste incineration without separation,resulting in the garbage that contain heavy metal follow with the exhaust gas treatment system get into the atmosphere,and finally,it through the dry and wet deposition into the soil.Although the regular waste incineration plants have a series of tail gas treatment system,because of heavy metal have refractory and its difficult migration of accumulation characteristics in the soil,which the result in whether heavy metals in exhaust emission standard or not,the heavy metal still accumulate in the soil environment,which bring environment pollution risks.In this paper,force on the coastal plain and hilly two waste incineration plants surrounding soil as the object of study,comparing the two places of soil physical and chemical properties,heavy metals spatial distribution,source analysis and heavy metal speciation distribution,chosen to the suitable represent element for analysis of the migration and accumulation response model.The preliminary forecast general environment life of waste incineration plant,for further study on the prevention and control of pollution has positive significance1.The physicochemical properties of the surrounding soil of incineration plants in coastal plain be with low volatile,and the soil type is uniform its belong to typical paddy soil.But in the inland mountainous is in high volatile in physicochemical properties,and the soil type is more complex and diverse.The coastal plain of incineration plants surrounding environment is relatively simple,mainly dominated by farmland,while the inland mountainous incineration plants surrounding environment is more complex,it have farmland,factoxy buildings,hills etc.2.Comparing and analysis the pollution source emission,indicate that the three kinds of volatile of heavy metals Hg,Cd,Pb in the tail gas,the emissions of Pb is much higher than that Hg and Cd,and the coastal plain is more obvious than that in inland mountain areas.By relativity and sketchy accumulation analysis showed that lead and zinc,significant correlation,are likely to have some homology in the mountainous interior,while the coefficient of correlation of Pb with other heavy metals such as copper,zinc,manganese is lower in the coastal plain,and other heavy metals with low homology;The heavy metal lead in the coastal plain in the spatial distribution is regular,in the downwind concentrations of heavy metals in soil is higher than that of the wind in the heavy metal concentration in the soil,and the maximum concentration distance is basically consistent with the calculation theoretical,that the lead is likely to significantly affected the incinerator tail gas;Analysis of the distribution law of soil heavy metals,lead mainly in reducible fractions and residual fractions,show that it is relatively stable in the soil,and the down direction reduction state of the higher proportion,but copper,zinc,manganese,and not the rule,which also shows them from the exhaust gas of garbage incineration.3.By the pollution emissions,the spatial distribution of heavy metals and PC A source apportionment and species of heavy metals in soil distribution analysis,found Pb is the most representative to waste incineration exhaust of the heavy metals.4.By calculation,animals and plants is relatively small impact for the migration of heavy metals in soil.In the study area,an annual increase of 20.318kg Pb,about 1.9%confluence into the source intensity,per unit area take 0.45mg;Through the infiltration experiment,rainwater infiltration to heavy metal Pb almost has no influence migration.The soil samples of IR and XRD test,we found that the main composition of the silicate minerals,containing quartz and cristobalite a parts of aluminum phosphate rock,plagioclase,and clay minerals illite,montmorillonite,kaolinite and muscovite.With the effect adsorption enrichment of heavy metal,which is not easy to migrate with the rain;through the analysis to predict runoff when the transfer of heavy metals is very weak,the rain water and take the lead for the amount of 0.028mg in the average per unit area,the migration intensity can be ignored.5.Based on the principle of conservation of mass,established the cumulative effect of model.The whole study area response model for Qo=Q-Qi;In all directions,cumulative response model for the Qk=QFk-Qik;The response model of the small study area for Qkj=QFk[?b f(x)dx/?-? f(x)dx]-?Qikj.6.The overall regional response model prediction results is low7%than the measured value,it is the likely cause of the heavy metals of Pb,in addition to waste incineration source,may also have other sources of pollution in the study area soil;The overall average error of the azimuth response model was 15.9%,higher than the overall regional response model,the overall average error of a single area response model was 34%,higher than the overall regional response model and the azimuth response model;error research area is small and its prediction is big.