陇南市垃圾填埋场周边土壤和地下水污染风险评估

Risk Assessment of Soil and Groundwater Contamination Around Longnan Landfill

填埋场的渗滤液可能造成周边土壤及水体的污染。因此,有必要了解填埋场周边水体污染质量以及土壤的重金属污染情况并提出相关的防治及管理策略。本文选择陇南市武都区、康县及成县三个典型填埋场作为研究对象,测试了周边水体质量及下游75,200及400 m范围内土壤中的重金属含量,包括镉、铅、铜、锌、铬、镍、汞、砷等金属元素。结果表明部分区域汞、砷及镉元素超标外,其余重金属含量均在标准范围之内,周边地下水中除氨氮所有指标均达到《地下水质量标准》Ⅲ类标准。此外,还对周边土壤进行了健康风险评估,结果表明周边土壤中重金属对成人和儿童均没有健康风险。最后,提出了一系列填埋场周边土壤污染防治措施。

Leachate from landfills may cause contamination of surrounding soil and water bodies.Therefore,it is necessary to understand the pollution quality of water bodies around landfills and the heavy metal pollution of soil and propose relevant prevention and management strategies.In this paper,three typical landfill sites in Longnan City,Wudu District,Kang County and Cheng County were selected as the research objects,and the quality of the surrounding water bodies and the content of heavy metals in the soil within 75,200 and 400 m downstream were tested,including cadmium,lead,copper,zinc,chromium,nickel,mercury,arsenic and other metal elements.The results showed that the content of heavy metals was within the standard range,except for mercury,arsenic and cadmium,which exceeded the standard in some areas,and all indicators in the surrounding groundwater,except for ammonia nitrogen,met the Class III standard of the Groundwater Quality Standard.In addition,a health risk assessment of the surrounding soil was conducted,and the results showed that there is no health risk to adults and children from heavy metals in the surrounding soil.Finally,a series of soil pollution prevention measures around the landfill were proposed.