Evaluation and application of heavy metal pollution in landfill humus soil based on human health risk
Using the waste pile and humus soil from a typical old domestic waste landfill as research objects,this pa-per analyzes the components of the waste pile.Based on the screening values for agricultural land use and the standards for planting soil greening,the pollution characteristics of six heavy metals,including Hg,Cd,As,Ni,Cu,and Zn in the humus soil are analyzed.In the meantime,the current recommended health risk model is used to evaluate the human health risks associated with the heavy metals in the humus soil.The results show that the main component of the waste pile is humus soil,with an average mass fraction of 39.72％.The concentrations of Cd,Cu,and Zn exceed the agricul-tural land screening values(pH＞7.5)specified in Soil Environmental Quality:Risk Management and Control of Soil Pollution in Agricultural Land(Trial)(GB 15618-2018),with maximum exceeding multiples of 1.15,0.24,and 0.39.Hence,it is not suitable for agricultural purposes.The concentration of Cd exceeds the Class Ⅲ standard of Gre-ening Planting Soil(CJ/T 340-2016),with a maximum multiple exceeding 0.075.It is recommended to mix humus soil with greening soil and use it for planting in road greenbelts,factory-affiliated green spaces,and other areas.The human health risk assessment of heavy metals indicates that the carcinogenic risk of As is unacceptable,with oral in-take and inhalation of soil particles as the main exposure pathways.Therefore,it is not suitable for use as construction land.The investigation shows that humus soil is an essential component of the typical domestic waste landfill pile.The systematic analysis of humus soil based on using human health risk assessment methods,provides a scientific founda-tion for the resource utilization and disposal of humus soil from waste piles.
万方数据
维普
