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首页> 外文期刊>Journal of Hazardous Materials >Adsorption of trace elements from poultry litter by montmorillonite clay
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Adsorption of trace elements from poultry litter by montmorillonite clay

机译：蒙脱土对家禽垃圾中微量元素的吸附

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摘要

Poultry litter (PL) is used as fertilizer on agricultural lands because of its high nutrient content. However, the litter also contains trace elements such as As, Cd, Cu, Pb, and Zn. On land application of PL, these trace elements may be absorbed by crops, leach into groundwater, or enter the aquatic system as run-off. The objective of this research was to study the effect of the addition of montmorillonite clay-mineral (CM) in reducing the release of trace elements from PL. Cd, Cu, and Zn showed significant decreases of 29, 34, and 22%, respectively, in PL aqueous leachate (compared with the control-PL without CM) on mixing with 0.05 g CM but no change in As, Co, and Cr concentrations was observed. Lead showed a significant increase in PL aqueous leachate on mixing with 0.2 g CM but Pb concentration was two orders of magnitude less than in CM aqueous leachate alone. On washing, the settled precipitate (PL + CM) in the centrifuge tubes with water (desorption study) most of the adsorbed metals (Cd 85%, Cu 61%, and Zn 100%) were released. The results of this study show that the addition of CM resulted in significant adsorption of Cd and Cu from PL.
机译：家禽垫料（PL）由于其高养分含量而被用作农田上的肥料。但是，垃圾中还包含微量元素，例如As，Cd，Cu，Pb和Zn。在PL的土地应用中，这些微量元素可能会被农作物吸收，渗入地下水或作为径流进入水生系统。这项研究的目的是研究添加蒙脱石粘土矿物（CM）在减少PL中微量元素释放中的作用。与0.05 g CM混合时，PL渗滤液中的Cd，Cu和Zn分别显着下降29％，34％和22％（与不含CM的对照PL相比），但As，Co和Cr不变观察到浓度。铅与0.2 g CM混合后PL水浸出液显着增加，但Pb浓度比单独CM水浸出液低2个数量级。洗涤时，在离心管中用水沉淀的沉淀物（PL + CM）（脱附研究）释放出大部分吸附金属（Cd 85％，Cu 61％和Zn 100％）。这项研究的结果表明，添加CM会导致PL中Cd和Cu的显着吸附。

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