工厂旧址开发绿化用地的水土污染评价和处理对策研究

Evaluation on Water and Soil Pollution in Former Plants and Restoration Countermeasures

对浙江省宁波市电化厂、热电厂、硫酸厂、农药厂等污染企业搬迁后留下旧址用于公园绿化用地进行水体和土体污染情况评价,结果表明:除六六六和氰化物外,p H、铅、锌、铜、砷、汞、镉、铬、镍、氟化物、滴滴涕等不同程度地受到较普遍的污染,个别样点甚至远远高于地表Ⅴ类水限值和土壤环境质量三级标准值,污染情况严重而复杂。根据污染因子聚类分析,结合样点测试和厂址背景分析,进行严重污染区和轻度污染区段的划分和重金属、强酸、强碱、滴滴涕、氟化物污染区块的界定,并提出清除大块石、增加有机质和蛭石、砌筑淋洗暗沟和沉淀井与沉淀池、营建小湿地、酸碱置换和植物修复等原地修复技术,以及小地形营造、地下隔离、覆盖客土、客土回填和选择抗性植物等防护对策。

Determinations were conducted on water and soil pollution in former electrochemical, thermal power, sulphuric acid and insecticide plants in Ningbo, Zhejiang province. The result demonstrated that water and soil in different sampling points of the determined area was polluted by Pb, Zn, Cu, As, Hg, Cd, Cr, Ni, F-, DDT. Analysis on the cause of pollution, propositions for further ecological restoration were offered such as removal of large rubble, adding organic matters and vermiculite, constructing underdrain and sedimentation basin, building small wetland, etc.