外源Cu胁迫下熟污泥改性黄土对Cu的吸持能力研究

发布时间：2018-01-08 21:02

本文关键词：外源Cu胁迫下熟污泥改性黄土对Cu的吸持能力研究　出处：《兰州大学学报(自然科学版)》2016年05期 　论文类型：期刊论文

【摘要】：采用序批实验,测定不同配比熟污泥改性黄土中的有机质、碳酸盐、总磷、全Cu、pH和土壤电导率,探讨了不同配比熟污泥改性黄土对重金属Cu的吸附-解吸行为.结果表明在不同配比熟污泥改性黄土中,重金属Cu的吸持量随着平衡浓度的增加而增大;Freundlich型方程是描述供试土样等温吸附线的最佳模型;乙酸铵对Cu的释放量随吸持量的增大而增大;释放率随着熟污泥配比的增大而减小;土壤固定量随着熟污泥配比的增大而增大,固定能力的增强降低了重金属带来的环境风险.
[Abstract]:The organic matter, carbonate, total phosphorus, total Cu pH and soil conductivity were determined by sequencing batch test. The adsorption and desorption behavior of heavy metal Cu on the loess modified by different proportion of cooked sludge was discussed. The results showed that the Cu uptake capacity increased with the increase of equilibrium concentration in the loess modified by different proportion of mature sludge. The Freundlich equation is the best model to describe the isothermal adsorption line of the soil sample. The amount of Cu released by ammonium acetate increases with the increase of absorptive capacity. The release rate decreased with the increase of the ratio of mature sludge. The amount of soil fixation increased with the increase of the proportion of mature sludge, and the enhancement of the fixation capacity reduced the environmental risk of heavy metals.
【作者单位】：兰州大学资源环境学院;
【基金】：国家自然科学基金项目(51178209,91025015) 中央高校基本科研业务费专项资金项目(lzujbky-2015-214,lzujbky-2015-138)
【分类号】：X53
【正文快照】： 近半个世纪以来,世界工业迅速发展、人口剧增,致使土壤污染物环境容量急剧减少,部分区域土壤甚至已发生重度污染.镉大米、血铅事件等环境公害事件的发生,使土壤重金属污染问题引起了社会各界的广泛关注.鉴于重金属元素的不可降解性、生物富集及难治理等特性,决定了土壤重金属

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