This work aims to the recovery of lignocellulosic waste in an environmentally friendly process, as an alternative to the energy- intensive technologies: steam explosion, subcritical and/or supercritical water treatment, gasification through pyrolisis, etc. A study was made to optimize the extraction conditions of potentially valuable compounds in straw degraded by the fungus Pleurotus ostreatus. The effects of solvent nature, temperature and extraction time were quantified by material balances with a special view to the extracts obtained. Confirmation of the effectiveness of the operations was done by spectrophotometric, HPLC and LC-MS analyses. Following this study, a technology localized to the farm was conceived, requiring few craftsmanship and no special utilities, to obtain a semi-product for further processing. A centralized technology could be also taken into account to process the straw by direct extraction with hot solvents, in order to obtain products yields three times higher than in the case of the aqueous extraction followed by solvent extraction at 20oC.