Fixed Dome Biodigester for the Production of Biogas: Anaerobic Co-digestion of Brewery Spent Grain and Cassava Waste Water

Abstract

If not adequately managed, cassava waste water and spent grain are an environmental problem. These wastes can be co-digested to create biogas in fixed dome biodigester. The study's major objective is to assess the co-digestion of used grain and cassava waste water for the creation of biogas. The cassava waste water was gathered from nearby processors in Nsukka, Enugu State, Nigeria, behind Ogige major market. The brewery's used grain was gathered. Three identical 48L capacity fixed dome biodigesters with a 30-day retention period were used in this study. In one digester, spent grain (SG) and cassava waste water (CWW) were combined in a 50/50 ratio, with 100% CWW and 100% SG acting as controls. On the undigested slurry, physicochemical studies were performed using accepted standard techniques. Utilizing SPSS Version 16.0, a statistical analysis of the data received for the volume of gas produced from each digester was performed. With an 81.9% methane content, the digester using 100% CWW produced the most biogas overall.. Cumulative biogas outputs and methane levels for the 100% SG and 50% CWW + 50% SG digesters were, respectively, 69.9 L and 83.9%; and 70.6 L and 82.91%.