Reuse of KOH Solutions during Black Ripe Olive Processing, Effect on the Quality of the Final Product and
Pedro García-Serrano1, Manuel Brenes1, Concepción Romero1
1Instituto de la Grasa (CSIC), Campus Universidad Pablo de Olavide, 41013 Sevilla, Spain.
Abstract:
A high volume of water is needed to produce black ripe olives, which also entails a significant volume of wastewater with a high organic and inorganic contaminant charge. To reduce this problem, the reuse of KOH solutions (lyes) in a new process was studied. Once the lyes were removed from the tanks, KOH was then added for a new darkening process. Reusing the lyes up to four times gave rise to a product with similar physico-chemical and organoleptic characteristics as obtained with fresh solutions. The application of this process reduced coadjutant consumption by 32% and water by 20%, while global wastewater presented a high K content whose concentration could be valorized as a fertilizer by replacing commercial potassium nitrate.
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