Recycling and valorization of distilled grape marc through vermicomposting: a pilot-scale study

Abstract The present study sought to evaluate the effectiveness of vermicomposting for valorization distilled grape marc, one main solid by-products winery sector during a 56-day pilot-scale trial. increase in density and biomass earthworms ( Eisenia andrei ) earlier stages process reflected suitability marc Vitis vinifera L. cv. Mencía) as feedstock order sustain large earthworm populations on level. Supporting this, from 14 days onwards pH Mencía fell within weak-alkaline levels electrical conductivity was between 0.21 0.11 mS cm −2 providing optimum conditions growth. A rapid decrease microbial activity well content total polyphenols, both indicative stabilized materials also recorded after vermicomposting. Moreover, macro- micronutrients end product matched with those considered have quality criteria good vermicompost respect plant health safe agricultural use. Altogether, it underlines feasibility an environment-friendly approach biological stabilization fulfilling environmental protection fertilizer production.