RECIRCULATION OF BIOGAS RESIDUE TO AGRICULTURAL LAND IN NAMIBIA– RISKS AND POTENTIALS IN FULL UTILIZATION OF ORGANIC WASTE
2011 (English)Conference paper (Refereed)
The current situation of waste disposal in Namibia is under developed. The country has a large meat and dairy industry as well as some breweries and wineries and today, none of the organic wastes are reused, recycled or utilized for energy utilization. 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 from organic wastes. This 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. Moreover, the paper aims to point out the potentials in using organic waste for biogas production and thereafter recycling the nutrient rich residue to the farmland of Namibia. The risks in such utilization will be touched upon, such as the toxic effects of the alkali rich liquid phase or the NO2-emissions. Of which the first can be considered a risk but also a potential if the alkali residue partly can replace the use of pesticide. We conclude that the availability of substrates, i.e. organic wastes, is sufficient for supplying one or several biogas plants to the area. According to our conclusions, fertilization with biogas residue should be promoted in Namibia as an alternative to the current fertilization.
Place, publisher, year, edition, pages
Engineering and Technology
Research subject Energy- and Environmental Engineering
IdentifiersURN: urn:nbn:se:mdh:diva-18293OAI: oai:DiVA.org:mdh-18293DiVA: diva2:608352
14th International waste management and landfill symposium, Sardinia, Italy, September 2011