Abstract

The paper reviews the impact of biogas use in rural communities in Zimbabwe. A comparative study between the use of firewood and the use of biogas can be done. The paper discusses the historical developments in the use of biogas to date. The use and cost of energy and power is assessed to identify options to replace with biogas. Possible replacement of natural gas and firewood usage is also considered. The different and main feed stocks for biogas are discussed with a view to determine feed stock options for Zimbabwe. The challenges around the use of human waste for biogas are examined in terms of perceptions and cultural aspects. A case for biogas use is developed to justify the need to use it since it is a renewable energy. The production of biogas in bio-digesters and biogas plants in different parts of the world is considered to provide possible benchmarks. A discussion of the climate change impacts of biogas use and the mitigation options are presented. Finally, research gaps are identified paving way for future studies. The proposed future studies will focus on these reviewed aspects and research gaps with a view to fully study the impacts of the use of biogas in rural communities in Zimbabwe. 

Keywords: biogas, bio-digesters, environmental impacts; environmental management, technology adoption