燃煤烟气脱硫副产物的重金属环境行为

通过理化分析、盆栽生物试验及土壤淋溶试验，探讨了脱硫副产物的重金属农业环境行为。结果表明：燃煤烟气脱硫副产物中的总Pb、Cd、Cr、As、Se、Ni、Cu等指标，基本上都低于国标最高容许量和土壤环境质量二级标准，符合国家控制标准，但普遍高于土壤自然背景值含量。8～10g／kg土的供试物量处理，花生、萝卜、甘蔗和水稻的可食部分重金属均无超常累积现象，未导致农产品重金属的富集残留污染，不影响农产品安全品质。在表土层供试物量达到40g／kg条件下，土壤淋溶试验结果表明，施脱硫副产物未导致土壤淋滤液重金属污染，不可能通过降雨淋溶过程，渗透过1m左右的土层而污染地下水源。

Study on the environmental behaviors of heavy metals in desulphurization byproduct

By means of the physical and chemical analysis, pot planting experiment and leaching experiment, the environmental behaviors of heavy metals in desulphurization byproduct have been assessed. The results showed that the content of heavy metals including Pb, Cd, Cr, As, Se, Ni, and Cu in the desulphurization byproduct, did not exceed the national control standard respectively, but higher than the value of soil natural background in generally. With the quantity of desulphurization byproduct up to 8~10 g/kg in soil, the heavy metals in the edible part of peanut, radish, sugarcane and rice was not accumulated exceptionally and did not decrease the security of farm products. The results of soil leaching experiment showed that even the application rate of desulphurization byproduct amounted to 40 g/kg in soil of surface layer, it did not induce heavy metal pollution in soil solution and there was no possibility of ground water contamination during the process of raining and infiltration.