Energetic valorization of olive waste water (liquid waste) by methanic fermentation in north of Morocco

Résumé

In this study, we present an innovative solution that allows to avoid pollution and to take advantage of olive waste water and similar industrial effluents. Indeed, the valorization of vegetable water allows by fermentation to recover the methane as renewable energy, and the remaining digestate which is an excellent fertilizer for the agricultural amendment. But the raw vegetable water is not fermentable; it is codigestion with other substrates that allows a good fermentation in particular conditions, including in particular, anaerobiosis, constant temperature and a suitable microbial inoculum. The balance of this valuation is positive from an economic and environmental (reduction of greenhouse gases). The application of this solution and its adaptation to the Moroccan context deserves to be encouraged with the help of investors and project leaders in the field of recovery of organic waste (liquids and solids).

Our study shows a biogas potential of more than 150 litter biogas per m³ of raw vegetable water with an energy equivalent of 6 kWh/m³ of biogas.