Modeling of the grape pomace composting process using the multi-criteria optimization method

[M. P. Ivanović]

[13],193 lista

Bibliografija: 171-185. Biografija autora: list. 192-193.

Waste management

Composting represents one of the most commonly applied approaches for sustainable management of agricultural organic waste, enabling its efficient transformation into valuable products such as compost. However, certain types of organic waste, such as waste from the wine industry (WIW), are not suitable for direct composting due to their high content of organic matter, lignocellulosic components, and low pH value. Although various utilization methods have been proposed, composting remains the most promising approach for the production of compost. Numerous studies have shown that composting of WIW is feasible with the addition of an appropriate co-substrate, which ensures favorable conditions for the initiation and progress of the process. Nevertheless, the influence of specific components, such as grape stems, depends on their proportion in the mixture and can be either positive or negative. Therefore, this doctoral research was focused not only on modeling but also on identifying key parameters and defining optimal ratios between WIW and co-substrates, with the aim of optimizing the co-composting process. In the first stage, a multi-criteria optimization was used and the global criterion method was applied to determine the optimal composition of mixtures. In the second stage, the co-composting process of grape pomace and mixtures with the addition of grape stems was experimentally monitored using three different co-substrates: food waste, poultry manure, and wheat straw. During the first part of the experimental study, mixtures composed of grape pomace and co-substrate, as well as grape pomace, co-substrate, and grape stems (25% w/w), were simultaneously monitored. In the second part, the best-performing mixtures were further analyzed by varying the grape stem proportion (15%, 25%, and 35% w/w) to determine the optimal share. As a result, the optimal co-substrate to be combined with grape pomace and the optimal proportion of grape stems in the mixture were determined. The quality of the obtained compost and its potential use as an organic fertilizer were also defined. Based on the obtained results, recommendations were proposed for improving the composting process and the quality of the final product.

ko-kompostiranje, komina grožđa, ogrozdina, ko-supstrat višekriterijumska optimizacija, kompost

co-composting, grape pomace, grape stems, co-substrate, multi-criteria optimization, compost

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