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Migration of heavy metals in soil-plant system after land use of sewage sludge at high application ratio
Journal of Hazardous Materials ( IF 12.2 ) Pub Date : 2024-09-16 , DOI: 10.1016/j.jhazmat.2024.135865 Huan Wang, Qian Chen, Fenfen Zhu, Jiawei Wang, Bing Zhao, Xingmin Fu, Yuqun Qiu, Renhua Chen
Journal of Hazardous Materials ( IF 12.2 ) Pub Date : 2024-09-16 , DOI: 10.1016/j.jhazmat.2024.135865 Huan Wang, Qian Chen, Fenfen Zhu, Jiawei Wang, Bing Zhao, Xingmin Fu, Yuqun Qiu, Renhua Chen
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As one of the reclamation methods of sewage sludge, land application is commonly used. Because almost all organic waste is supposed to be recycled in land use, higher application ratio is necessary. This study conducted sludge land use experiments under high application ratio, and the migration of heavy metals in soil-plant system were studied. The mixture ratio of sludge to soil was 0:1, 0.00862:1, 0.2:1 (240 DS t/hm2 ), and 0.75:1 (900 DS t/hm2 ), which is higher than ISO 19698: 2020 and all the Chinese standards. The results showed that the high ratio of sludge application increased the concentration of heavy metals in soil, but after planting plants, the concentration of heavy metals decreased. And compared to sunflower and black-eyed Susan, ryegrass had the best bioaccumulation and transport capacity for heavy metals. As for the residual heavy metals in the soil, compared to the application ratio of 0.00862:1, increasing the application ratio to 0.2:1 did not significantly increase the risk of heavy metals. And if sludge was applied continuously for 15 years, only Hg may have a cumulative risk at the ratio of 0.2:1, but did not exceed GB 36600–2018. Controlling the maximum application rate at 0.2 and planting ryegrass can be a feasible strategy.
更新日期：2024-09-16
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