Investigation and Analysis of Soil Pollution in a Coking Plant in Inner Mongolia
Taking a coking plant plot as the survey object,through data collection,pollution identification,and sampling detection analysis,the geological and hydrogeological conditions of the plot were identified.A preliminary conceptual model of plot pollution was established,potential pollutant types and distribution characteristics of pollution sources were identified.127 soil sampling points were set up,and 418 soil samples were collected for comprehensive pollution analysis.The results showed that there were 10 indicators in the plot that exceeded the standard,including ethylbenzene,benzene,naphthalene,benzo[a]pyrene,dibenzo[a,h]anthracene,benzo[a]anthracene,benzo[b]fluoranthene,indeno[1,2,3-cd]pyrene,benzo[k]fluoranthene,and petroleum hydrocarbons(C10-C40).The exceeding indicators are mainly distributed in three areas:coal preparation and coking section,ammonium sulfate section,coal tar ammonia water storage tank,and cold drum electric capture section.There is no groundwater in the shallow layer of the plot,and pollutants enter the soil of the plot.The lateral diffusion and migration speed is slow,and pollutants in the vertical direction may gradually migrate and diffuse to the lower soil layer with atmospheric precipitation,posing environmental risks to the site soil,providing basis support for the next step of risk assessment and pollution control.
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