废弃石化用地土壤和地下水污染调查与评估

Investigation and Assessment of Pollution Situation of Soil and Groundwater in Abandoned Petrochemical Sites

采用单因子指数法和改进的内梅罗指数法对某废弃石化场地土壤和地下水的污染状况进行了监测与评估。结果表明:厂区内土壤石油类物质超标,最大单因子指数达8.03,以改进的内梅罗指数评价96%的土壤点位处于清洁状态;地下水监测结果挥发酚、石油类、亚硝酸盐氮、硫化物多种污染物严重超标,最大单因子指数高达19975,以改进的内梅罗指数评价40%监测点位为Ⅳ类水体,33.3%为Ⅴ类水体。因此,在该废弃石化场地进行土地开发利用时,必须首先对场地内储罐和污水处理区附近的土壤和地下水进行修复和综合治理。这一研究结果可为该石化场地污染修复、土地利用决策提供决策依据。

Pollution situationofsoil and groundwater in a typical abandoned petrochemical sitewasassessed by the methodsof typical single pollution index and improved Nemerow pollution index.Only the total petroleum hydrocarbons(TPH)insoil exceeded the national standard,and its maximum single index reached 8.03.The assessment results by the improved Nemerow index method showed that 96%of the soil was at a clean state.The monitoring indices of groundwater seriously exceeded the national standard,including volatile phenols,oil,nitrite nitrogen,sulfides,etc.And their maximum single index was up to 19975.The assessment results by the improved Nemerow index method showed that 40%of the groundwater quality wasⅣtype,and 33.3%wasⅤtype.In the further land utilization of this site,the remediation and treatment of the soil and groundwater must be conducted in the areas near oil tanks and sewage treatment facilities.The research results could provide references for pollution remediation and for land use.