Bioremediation of olive oil mill wastewater and production of microbial biomass |
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Authors: | Samuela Laconi Giovanni Molle Antonio Cabiddu Raffaello Pompei |
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Affiliation: | (1) Sezione di Microbiologia Applicata, Università di Cagliari, via Porcell 4, 09124 Cagliari, Italy;(2) Istituto Zootecnico Caseario di Sassari, Tutubella, Sassari, Italy;(3) Biotecne, via Nuoro 58, 09125 Cagliari, Italy |
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Abstract: | Olive oil mill wastewater (OMWW) was used as a substrate for the culture of a mixture of edible fungi in order to obtain a potentially useful microbial biomass and to induce a partial bioremediation of this fastidious waste. Before fermentation, the OMWW underwent an alkaline-oxidative treatment with the aim of decreasing the polyphenolic content which is the main cause of its toxicity. The fungal mixture grew fairly well in the treated OMWW and reached a maximum of biomass production within about 14 days of fermentation at room temperature. Up to 150–160 g of wet biomass was obtained per liter of OMWW. Analysis of the partially dehydrated biomass revealed a protein content of about 13 g% and 6 g% of row fiber. A relevant presence of unsaturated fatty acids was found, as well as the presence of significant amounts of vitamins A and E, nicotinic acid, calcium, potassium and iron. The possibility of using the microbial biomass produced from OMWW as an additive to animal feed is discussed. |
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Keywords: | Biodegradation Bioproteins Microbial biomass Pleurotus Olive oil mill wastewater Yeasts |
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