Heavy metal characteristic analysis of slag from small scale domestic solid waste thermal treatment facilities in remote rural areas
The physicochemical properties and heavy metal pollution characteristics of slag from small scale thermal treatment facilities operating in remote rural areas in China were evaluated comprehensively.It was found that the thermal reduction rate of bottom ash from small scale thermal treatment facilities was consistently below 5％.Notably,facilities utilizing incineration technology exhibited a lower heat reduction rate of 0.70％compared to those using pyrolysis technology,indicating a more significant reduction in domestic solid waste volume.The main crystal components included calcite,quartz,etc.However,the content of certain heavy metals in both bottom ash and fly ash exceeded the limit values for pH 5.5 to 6.5 as outlined in the"Soil environmental quality-risk control standard for soil contamination of agricultural land"(GB 15618-2018).This suggested that the direct introduction of untreated fly ash and bottom ash into the soil could lead to potential heavy metal pollution.Furthermore,elements such as arsenic,selenium,barium,copper,chromium,and zinc in the bottom ash demonstrated a degree of bioavailability.When compared to bottom ash,fly ash showed a higher proportion of bioavailable heavy metals,indicating a greater potential environmental pollution risk.
万方数据
维普
