开挖的非正规填埋场重(类)金属污染及潜在生态环境风险分析——以嘉善县某填埋场为例  

Analysis of Heavy Metal(Metalloid)Pollution and Potential Ecological Risk in Excavated Irregular Landfill Sites:A Case Study of a Landfill Site in Jiashan County

作　　者：施瑾瑾 SHI Jinjin(Shanghai Environmental Engineering Technology Co.Ltd.,Shanghai 200000)

机构地区：[1]上海环境工程技术有限公司,上海200000

出　　处：《环境卫生工程》2024年第3期78-83,共6页Environmental Sanitation Engineering

摘　　要：为明确非正规垃圾填埋场开挖后土地资源是否可实现安全利用,以嘉善县某填埋场为例,对开挖范围基坑及侧壁多点采集样品,对其pH、有机质和重(类)金属浓度进行了检测。结果表明:基坑底部、侧壁土壤中均未检出汞,镉含量与背景点浓度接近,样本含量均≤0.23 mg/kg;重金属总铬、总铜、总铅、总锌在所有样品中的浓度变化趋势相同,最大值分别为99.0、40.2、43.0、201.0 mg/kg,约为背景值的2.43倍、1.05倍、1.60倍和2.03倍,但均低于CJ/T 340—2016绿化种植土壤和GB 36600—2018土壤环境质量建设用地土壤污染风险管控标准(试行)的要求,可满足绿地用地要求。填埋场土壤中pH为6.77~8.26,基坑底部土壤有机质较低,均值约为7.96 g/kg,远小于绿化用地标准(12~80 g/kg),若要使得该土地符合绿化要求,则需增加有机质含量。根据Hakanson潜在生态风险指数法计算得到该填埋场土壤重(类)金属潜在生态风险RI值为8.85 (RI<150),表明该填埋场由汞、镉、砷、铅、铜、铬、锌、镍等8种重(类)金属造成的生态风险较低。To clarify whether the land resources could be reused safely after excavation in an informal landfill site,a landfill site in Jiashan county was taken as an example.Samples were collected from the excavation area of foundation pit and side wall,and the pH,organic matter and heavy metal(metalloid)concentrations of samples were detected.The results showed that mercury was not detected in the soil at the bottom and side wall of the foundation pit,the cadmium content was close to the background concentration,and the sample content was both below 0.23 mg/kg.The concentration trends of total chromium,copper,lead,and zinc in all samples were the same,and the maximum values were 99.0,40.2,43.0,and 201.0 mg/kg,respectively,with approximately 2.43,1.05,1.60,and 2.03 times over the background value.However,they were all lower than the requirements of the CJ/T 340—2016 Planting Soil for Green and GB 36600—2018 Soil Environmental Quality Risk Control Standard for Soil Contamination of Development Land,which could meet the requirements for green land use.The pH of the soil in this landfill site ranged from 6.77 to 8.26,with a relatively low organic matter content(average of about 7.96 g/kg)at the bottom of the foundation pit,which was much lower than the green land standard(12 to 80 g/kg).To make the land meet the green land requirements,it was necessary to increase the organic matter content.In addition,according to the Hakanson potential ecological risk assessment of soil heavy metals(metalloids),the RI value was calculated to be 8.85(RI<150),indicated that the ecological risk caused by eight heavy metals(metalloids)such as mercury,cadmium,arsenic,lead,copper,chromium,zinc,and nickel in the landfill site was of a mild level.

关 键 词：非正规填埋场 开挖 重(类)金属 绿化用地 生态风险评估 

分 类 号：X705[环境科学与工程—环境工程]