RECIRCULATION OF BIOGAS RESIDUE TO AGRICULTURAL LAND IN NAMIBIA- RISKS AND POTENTIALS IN FULL UTILIZATION OF ORGANIC WASTE

摘要

The current situation of waste disposal in Namibia has large potential for biogas. The country has a large meat and dairy industry as well as some breweries and wineries. Little has been done in order to collect and utilize the resources in the organic waste from these industries but there is currently some early stage projects in planning related to biogas production. The current study aims at evaluating the potential for some three planned biogas projects in Namibia at early stage, especially regarding the management of the biogas residue. In this processes, a first screening of the potential biogas substrate in the southern part of Namibia (south of Windhoek) was conducted. Theoretically, all types of biomass that contain, fat, proteins, carbohydrates, cellulose and hemicellulose can be used as substrate and the biogas outtake as well as the methane yield will vary depending upon the proportions. Generally, a higher protein and fat content gives a higher methane ratio.