ENVIRONMENTAL AND ENERGY PERFORMANCES OF THE BIOMETHANISATION APPLIED TO THE BOVINE DEJECTIONS IN THE TUNISIAN CONTEXT

Abstract

This work consists in studying the Biomethanisation, applied to the bovine dejections, established on the level of four experimental digesters, different of parameters of point of view of operation, and another rural at the level of the farm. The follow-up of this last relates on the determination of certain physicochemical characteristics of the introduced dungs and to the analysis of principal environmental parameters in order to establish the assessment of depollution. The follow-up of the digesters focused also mainly on the effect of the variation of some physicochemical parameters of anaerobic digestion, discontinuous on the quantitative and qualitative gas production. One can release particularly that: - The process of rural Biomethanisation allows an interesting depollution as Suspended Solids (MES) and Biological Oxygen Demand (DBO5). - The production of experimental biogas is variable according to the adopted parameters of operation. It is maximal in the presence of a high temperature and under a mechanical agitation of the introduced substrate. - The conditioning of rural biogas enables improved quality of both composition and on calorific value.