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Risk of Leaching in Soils Amended by Compost and Digestate from Municipal Solid Waste

机译：从城市固体废物中堆肥和污物修正土壤浸出的风险

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摘要

New European directives have proposed the direct application of compost and digestate produced from municipal solid wastes as organic matter sources in agricultural soils. Therefore information about phosphorus leaching from these residues when they are applied to the soil is increasingly important. Leaching experiments were conducted to determine the P mobility in compost and digestate mixtures, supplying equivalent amounts to 100 kg P ha−1 to three different types of soils. The tests were performed in accordance with CEN/TS 14405:2004 analyzing the maximum dissolved reactive P and the kinetic rate in the leachate. P biowaste fractionation indicated that digestate has a higher level of available P than compost has. In contrast, P losses in leaching experiments with soil-compost mixtures were higher than in soil-digestate mixtures. For both wastes, there was no correlation between dissolved reactive P lost and the water soluble P. The interaction between soil and biowaste, the long experimentation time, and the volume of leachate obtained caused the waste's wettability to become an influential parameter in P leaching behavior. The overall conclusion is that kinetic data analysis provides valuable information concerning the sorption mechanism that can be used for predicting the large-scale behavior of soil systems.
机译：欧洲新指令已建议将城市固体废物产生的堆肥和消化物直接用作农业土壤中的有机物。因此，有关将这些残留物施用于土壤时从其中浸出磷的信息越来越重要。进行了淋溶实验，以确定堆肥和消化混合物中的磷迁移率，向三种不同类型的土壤提供等量的100 kg P ha -1 。根据CEN / TS 14405：2004进行测试，分析最大溶解的反应性P和渗滤液中的动力学速率。磷生物废物分级表明，消化物中的有效磷水平高于堆肥。相比之下，在土壤-肥料混合物的浸出实验中，磷的损失高于土壤-肥料混合物。对于这两种废物，溶解性反应性磷的损失与水溶性磷之间没有相关性。土壤与生物废物之间的相互作用，较长的试验时间以及所获得的沥滤液的量使废物的可湿性成为影响磷淋溶行为的参数。 。总的结论是，动力学数据分析提供了有关吸附机制的有价值的信息，可用于预测土壤系统的大规模行为。

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