Comparative characterization of sewage sludge compost and soil: Heavy metal leaching characteristics.
Comparative characterization of sewage sludge compost and soil: Heavy metal leaching characteristics.
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DOI：
10.1016/j.jhazmat.2016.02.025
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发表时间：
2016-06
影响因子：
13.6
通讯作者：
Wen Fang;Yonghong Wei;Jianguo Liu
中科院分区：
文献类型：
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作者：
Wen Fang;Yonghong Wei;Jianguo Liu
重金属的浸出和积累是污水污泥堆肥（SSC）土地应用后的主要问题。我们比较了SSC、参考土壤和SSC改良土壤的特征，以研究它们在重金属淋溶行为方面的异同，然后评估SSC土地施用对土壤淋溶行为的影响。结果表明，有机质，包括颗粒有机质（POM）和溶解性有机质（DOM），是影响SSC和土壤中重金属淋失的关键因素。当SSC以48吨/公顷的施用量施用于土壤时，DOM含量的增加在适用的pH范围（6<pH<8）和碱性pH条件下略微增强了改良土壤中重金属的浸出，并导致液相中更多的DOM结合物质。然而，随着SSC的应用，POM含量的增加对重金属的浸出行为影响较小。地球化学形态模型显示参考土壤和修正土壤固相中重金属形态相似。
The leaching and accumulation of heavy metals are major concerns following the land application of sewage sludge compost (SSC). We comparatively characterized SSC, the reference soil, and the SSC amended soil to investigate their similarities and differences regarding heavy metal leaching behavior and then to evaluate the effect of SSC land application on the leaching behavior of soil. Results showed that organic matter, including both of particulate organic matter (POM) and dissolved organic matter (DOM), were critical factors influencing heavy metal leaching from both of SSC and the soil. When SSC was applied to soil at the application rate of 48 t/ha, the increase of DOM content slightly enhanced heavy metal leaching from the amended soil over the applicable pH domain (6 < pH < 8) and at alkaline pH, and led to more DOM-bound species in the liquid phases. However, the increase of POM content with the SSC application had less influence on the leaching behavior of heavy metals. The geochemical speciation modeling revealed that heavy metal speciation in the solid phase were similar between the reference soil and the amended soil.