Changes in consumer demand due to preferences for a healthier lifestyle have led to a new market offering fruit and salad products ready to eat. This affects the agro-industrial sector and the characteristic of waste streams generated having the organic fraction higher quality and representing a new opportunity of valorisation. This study experimentally evaluated the digestion of wastes derived from the fourth range product sector. It was also proposed the use of this digestate as a fermentation medium for producing plant growth-promoting cultures. Three digestion scenarios were studied: Scenario 1 considered biogas valorisation using a combined heat and power (CHP) unit. Scenario 2 featured biogas upgrading to be used as vehicle fuel. Finally, scenario 3 evaluated the transport of waste materials to the digestion plant by a network of pipes and pumps directly from the production chain. All three scenarios included the land application of a biostimulator based on the production of a plant growth-promoting culture derived from digestate. Life cycle analysis and life cycle costing were used to determine potential environmental impacts and costs over a lifetime of 25 years. The study showed that scenario 1 was the most favourable option for valorising this type of waste, although the economic assessment resulted in negative values for all three alternatives.

中文翻译：

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第四范围的水果和蔬菜产品的厌氧消化：通过生命周期评估和生命周期成本比较三种不同方案的价值评估。

由于偏爱更健康的生活方式而导致的消费者需求变化导致了一个新的市场，提供了即食的水果和沙拉产品。这影响了农业工业部门以及产生的废物流的特性，这些废物流具有较高的有机成分质量，代表了新的增值机会。这项研究通过实验评估了第四类产品部门产生的废物的消化。还建议将该消化物用作发酵培养基以产生促进植物生长的培养物。研究了三种消化方案：方案1考虑了使用热电联产（CHP）单元的沼气增值。方案2中将沼气升级为车辆燃料。最后，方案3通过直接来自生产链的管道和泵网络评估了废物向消化厂的运输。所有这三种情况都包括基于刺激物产生的植物促生长培养物的生物刺激剂在土地上的应用。使用生命周期分析和生命周期成本来确定25年生命周期中潜在的环境影响和成本。研究表明，方案1是对这类废物进行均价评估的最有利选择，尽管经济评估得出这三种替代方案均为负值。使用生命周期分析和生命周期成本来确定25年生命周期中潜在的环境影响和成本。研究表明，方案1是对这类废物进行均价评估的最有利选择，尽管经济评估得出这三种替代方案均为负值。使用生命周期分析和生命周期成本来确定25年生命周期中潜在的环境影响和成本。研究表明，方案1是对这类废物进行均价评估的最有利选择，尽管经济评估得出这三种替代方案均为负值。