Abstract: The Tati Greenstone Belt (TGB) in northeastern Botswana hosts numerous Au deposits (Shashe, Mupane and Signal Hill) associated with sulfides, garnet and white mica. In this study, integrative white mica Ar/Ar, garnet U-Pb and sulfides Pb/Pb dating techniques were combined with whole rock and sulfide Pb isotope characteristics to track the source(s) of gold and constrain the timeframes of gold mineralization events. All sulfides and arsenopyrite samples from the TGB yielded overlapp...
Abstract: The adequate supply of the ever-increasing demand of fresh water continues to be a global challenge due to increase in population. The anticipation for better lifestyles and improved water supply has resulted in an increase in migration from rural settlements leading to an increase in the populations of many cities globally. This study therefore investigates the variability and trends in the surface water demand and supply of the city of Gaborone and surrounding areas in respon...
Abstract: Six municipal solid waste management (MSWM) options (A1–A6) in Harare were developed and analyzed for their global warming, acidification, eutrophication and human health impact potentials using life cycle assessment methodology to determine the least impactful option in Harare. Study findings will aid the development of future MSWM systems in Harare. A1 and A2 considered the landfilling and incineration, respectively, of indiscriminately collected MSW with energy recovery and by...
Abstract: The study was conducted in Oromia Region, Eastern Hararghe zone,Grawa districtand in Haramaya University 2019/2020. The objectives were to assess beekeeping practices in Grawa district and the effect of different comb cuttingon the number and size of sealed queen cell cups in Haramaya University apiary to generate baseline information for further research and development. From Grawa district, six potential kebeleswere selected kebeles (two from three agro ecologies) and from those ...
Abstract: In the present study, an assessment on corrosion resistance of aluminium alloys type AA2036 and AA7075-T651 in varying solution consisting of acidic, saline and in contaminated acid-chloride environments was investigated using weight loss and electrochemical techniques. The as-received samples were sectioned into corrosion coupons polished, degreased and weight taken. Solutions containing 3.5 % NaCl, 0.5 M HCl, 0.5 M H2SO4 were prepared as corrosion media and combination of these s...
Abstract: Cumulative plastic production worldwide skyrocketed from about 2 million tonnes in 1950 to 8.3 billion tonnes in 2015, with 6.3 billion tonnes (76%) ending up as waste. Of that waste, 79% is either in landfills or the environment. The purpose of the review is to establish the current global status quo in the plastics industry and assess the sustainability of some bio-based biodegradable plastics. This integrative and consolidated review thus builds on previous studies that have foc...
Abstract: Neoarchean granitoids are commonly exposed along Archean high-grade metamorphic terranes, where they occur as granitoid gneisses. A number of issues, including the effect of overprint event(s), can complicate the characterization of these granitoids in Archean terranes. A case study is presented here highlighting the complexity of characterizing Neoarchean granitoid magmatism from the Limpopo Complex high-grade terrane in southern Africa. Neoarchean granitoids occurring within the ...
Abstract: Power producing plants are major emitters of greenhouse gases that lead to global warming and climate changes. In the past two to three decades, attention has been drawn to organizations such as these reduce their dependence on coal reserves which are depleting and focus on producing clean energy i.e. for every ton of fuel produced, 100 kg or more should be made from clean energy. This has made torrefaction to gain interest as it improves energy content of biomass, a renewable and ...
Abstract: This paper introduces the various upstream land use activities that are major contributors of downstream water pollution. The proposed measures to reduce the pollution of downstream water bodies such as sustainable agricultural activities, systematic land allocation and management are discussed in the paper. It presents the analysis of upstream land use against the water quality parameters measured at different water management facilities to identify the most significant land use f...
Abstract: In this study, activated biochar from municipal sewage sludge was used for the treatment of sewage water. The sewage physicochemical parameters were measured before and after bio filtration with biochar applying the principle of adsorption using the standard methods. Biochar with 500 m2/g surface area at a loading of 2.5 g/L was employed. A reduction of more than 75% was observed for the total nitrogen, biological oxygen demand, chemical oxygen demand, total solids, electrical cond...
Abstract: This paper is a case study review of the timber waste problem and solutions that have been proffered in the Manicaland region of Zimbabwe. The study was conducted through primary data collected during site visits and a review of literature reports on the area. It revealed the absence of up to date quantitative and spatial data on timber waste, with literature reporting at least 70,000 tonnes per annum of sawmill waste. Most of the offcuts and chips are utilized at commercial sawmil...
Abstract: The production of copper bears both viable product and by product know as slag which is a challenge to dispose and poses a problem to the environment. BCL holds copper slag is seen as waste which is iron - opulent containing heavy metals which can seep into ground water and affect environment. These metal accumulate in millions of tonnes year after year posing as a threat to the environment and need to be managed to avoid them being harmful. This paper explores metallurgical ways o...
Abstract: The recovery of precious metals like gold is increasing each day due to its high market prices along with diverse applications. Bio-sorption represents a biotechnological innovation as well as a cost effective and excellent tool for recovery of precious metals from aqueous solutions. This study offers an overview of a recent scenario of bio-sorption studies carried out on the use of some promising bio-sorbents which could serve as an economical means for recovering gold for small s...
Abstract: The tyre industry in Botswana produces and sells thousands of tyres annually generating volumes of waste tyres which contribute towards the country’s waste management challenges. At the end of their useful life, most tyres end up at waste dumping sites while a small fraction is recycled or reused, posing a health, safety and environmental hazard. The same desirable that make tyres, such as immunity to biodegradation, chemical reagents and photochemical decomposition tend to make ...
Abstract: Plastics have remained the material of choice, and after serving their intended purpose, a large proportion ends up in the environment where they persist for centuries. The packaging industry is the largest and growing consumer of synthetic plastics derived from fossil fuels. Food packaging plastics account for the bulk of plastic waste that are polluting the environment. Additionally, given the fact that petroleum reserves are finite and facing depletion, there is a need for the d...