Production of bio-fertilizer from Jatropha cake blended
(M. M. Manyuchi and M. Nyamunokora)
This study aimed at assessing the feasibility of producing a bio-fertilizer from jatropha cake blended with vermicompost and vermiwash. Experiments were done to determine the optimum temperature and pH for digestion, as well as the optimum drying temperature for the bio-fertilizer. Further tests were carried out to determine the moisture content and the nitrogen, phosphorus and potassium content (NPK) of the bio-fertilizer.
Renewable energy as one of the solutions to the climate crisis towards a sustainable world
Renewable energy still remains unused are most of the countries as a source of energy despite it being the solution to combat climate change. Most of the energy comes from non-renewable sources like coal. It still remains the top choice toproduce energy. Unless we give renewable energy a serious thought, the problem of energy crisis cannot be solved.
Techno-Economic Analysis for Papermaking from Bagasse as a Value Addition Strategy
(M. M. Manyuchi Auxilliah. T. Chiwanga, and D. J. Nkomo)
The pulp and paper manufacturing industry Zimbabwe relies heavily on importing waste paper as its raw material from neighbouring countries such as South Africa. At the same time, the available local resource is wood, the continual cutting of which results in environmental problems. As a measure to add value and beneficiation of the sugarcane bagasse as well as to reduce deforestation, there is need to use alternative raw materials such as bagasse, which is readily available at sugar plantations for paper production.
Biogas Production from Saw dust using Acti-zyme as Digestion Catalyst and its Upgrading to Bio methane using Chemical Absorption
Zimbabwe has one of the largest deposits of timber in Southern Africa (about 500 000 tons per annum) such that most entrepreneurs venture into timber processing. The venture results in generation of a lot of sawdust dumps that are of no economic use if they are left lying around. There is 10000 metric tons that go to waste each year which when bio-converted can result in biogas. Continue Reading
Biodiesel production from waste cooking oil: Technical and Economic Feasibility
Biodiesel production from waste cooking oil (WCO) is an alternative source of biofuels. WCO is a cheaper raw material compared to other sources since it’s a waste product. Visits to food outlets in Harare indicated an average 28.9% disposal of the total oils and fats consumed. Alkaline trans-esterification process was used for the conversion of WCO to biodiesel.
Sewage Plants’ Potential to Produce Biogas for Electricity Generation-Case Study of the Three Zimbabwe Municipalities
Treatment of municipal sewage sludge is a problem in Zimbabwe. However, if the appropriate waste to energy technologies are applied, sewage plants can generate their own electricity thus minimizing municipalities’ reliance on the already strained national grid.