Abstract

In order to valorize the use of digestate, the purposes of this study was to discriminate the fertilizing potential of solid and liquid fractions of digestate using two soils that differed for chemical characteristics, to expand the digestate use reducing its environmental impact. The two fractions did not contain toxic compounds and differed in chemical compositions. The two soils responded differently to the addition of the two-digestate fractions and the benefit depended mainly on soil characteristics rather than on quantity and quality of the organic material applied. In the soil with neutral pH, the highest intrinsic amount of organic matter, microbial biomass (MBC), fungi, bacteria and cation exchange capacity were observed; all these properties increased the most over time, in presence of both solid and liquid fractions. Differently, in the soil with alkaline pH and minor amount of intrinsic organic matter, MBC, fungi and bacteria, only few properties such as oxidative soil activity, bacteria colonies, and organic matter amount were improved by the addition of digestate fractions. The use of both fractions showed more agricultural advantages in respect to the relative risks, and the solid fraction was the most effective. Even if the effects of digestate on soil ecosystem can differ in extent, we can expect economic benefit deriving from the reduction of the costs for its disposal, agricultural benefit for their high supply of nutrients to the soil and environmental advantages for the decrement in the use of manufactured fertilizers.

Graphic Abstract

中文翻译：

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Digestate在两种不同土壤上的应用：农业收益和风险

摘要

为了平衡消化液的使用，本研究的目的是通过使用两种化学性质不同的土壤来区分消化液固形和液态部分的施肥潜力，以扩大消化液的使用，从而减少其对环境的影响。这两个部分不包含有毒化合物，并且化学组成不同。两种土壤对添加两种消化物的反应不同，其收益主要取决于土壤的特性，而不取决于所施用有机材料的数量和质量。在pH为中性的土壤中，有机质，微生物生物量（MBC），真菌，细菌和阳离子交换能力最高。在固体和液体部分均存在的情况下，所有这些特性随时间的推移增幅最大。不同的是 在具有碱性pH值和少量固有有机物，MBC，真菌和细菌的土壤中，添加消化液组分仅能改善土壤的氧化性，细菌菌落和有机质等特性。就相对风险而言，两种馏分的使用均显示出更多的农业优势，而固体馏分最为有效。即使消化物对土壤生态系统的影响程度有所不同，我们也可以预期其经济效益来自于其处置成本的降低，农业为土壤提供大量养分的利益以及环境对使用量的减少的利益。制造肥料。通过添加消化部分，细菌菌落和有机物含量得以改善。就相对风险而言，两种馏分的使用均显示出更多的农业优势，而固体馏分最为有效。即使消化物对土壤生态系统的影响程度不同，我们也可以预期其经济效益来自于处理成本的降低，农业为土壤提供大量养分的收益以及环境对使用量的减少的收益。制造肥料。通过添加消化部分，细菌菌落和有机物含量得以改善。就相对风险而言，两种馏分的使用均显示出更多的农业优势，而固体馏分最为有效。即使消化物对土壤生态系统的影响程度有所不同，我们也可以预期其经济效益来自于其处置成本的降低，农业为土壤提供大量养分的利益以及环境对使用量的减少的利益。制造肥料。

图形摘要