Exploration on the Treatment of Stale Waste in Old Landfill Sites and Comprehensive Development of Land Reuse
Taking an old landfill site in a southern city as an example,the composition of stale waste,characteristics of humus soil,and soil pollution below the bottom of the heap were analyzed.The results showed that the ash content of stale waste was high,and the calorific value(low wet basis)did not meet the entry furnace requirements of GB/T 18750-2022 Municipal Solid Waste Incinerator and Heat Recovery Boiler.If it is directly incinerated,the cost-effectiveness is not high,so it should be screened before resource utilization.There were 6 indicators in humus soil that exceeded the standard to varying degrees.Organic matter,total nutrients,and seed germination index failed to meet the limit requirements of NY/T 525-2021 Organic Fertilizer.Measures could be taken to treat and repair humus soil,after improving its organic matter and germination rate,it could be used as planting soil,covering soil,and organic fertilizer,which could enhance the resource utilization level of humus soil.The soil pollutant indicators below the bottom of the waste dump(45 items and characteristic items)all met the requirements of the first and second categories of soil pollution risk screening values for construction land in GB 36600-2018 Soil Environmental Quality Risk Control Standard for Soil Contamination of Development Land,and the concentration has not reached the level that constitutes pollution.It was recommended to dig stale waste after stabilizing the waste heap,classify and transport it out for resource utilization after in-situ screening.After the site land meets the reuse standards,make overall plans to rehabilitate the landfill and the surrounding land,to realize the comprehensive development and reuse of the land.
landfillstale garbagephysical and chemical propertyresource utilizationcomprehensive development
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