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Impact of Co-digesting food waste with cow dung

Char production through the co-pyrolysis of coal and biomass in a fixed FED reactor

  • Authors: Motlhatlhedi, T. J. , Muzenda, E. , Mamvura, T. A.
  • Date: 2020
  • Subjects: Cow dung , Char , Coal
  • Language: English
  • Type: Article
  • Identifier: http://hdl.handle.net/10210/461807 , uj:41146 , Citation: Motlhatlhedi, T.J., Muzenda, E. & Mamvura, T.A. 2020. Char production through the co-pyrolysis of coal and biomass in a fixed FED reactor.
  • Description: Abstract: Coal contributes to 40% of the world’s energy production and the process of energy production from coal contributes to 40% of the world’s carbon dioxide emissions which have led to global warming and climate change. Thermochemical processes like pyrolysis, gasification and carbonification are used to utilize coal and this coal can be mixed with other sources of energy such as biomass for environmental protection, a higher energy densification and char yield. In this study Morupule coal was co-pyrolyzed with cow dung in a fixed bed reactor with the aim of producing char whilst reducing the net carbon dioxide emissions. Co-pyrolysis of coal with biomass yields char, gas and liquid fuel. Char is used in various sectors such as agriculture to improve soil quality hence increasing crop yields and as an adsorbent for wastewater treatment. The co-pyrolysis process was performed at 500oC and atmospheric pressure under an inert atmosphere which contained argon. Pyrolysis using a fixed bed reactor was performed on coal and cow dung at blend ratios of coal to cow dung of 0:100, 50:50, 60:40, 70:30, 80:20, 90:10, and 100:0. Proximate analysis results indicated that char had a higher fixed carbon compared to those from the individual substrates. Calorific value (CV) tests of the chars indicated that reducing to 90:10 ratio the cow dung concentration resulted in CV increases. This study shows that there is a synergic effect between the sub-bituminous Morupule coal and cow dung.
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Corrosion inhibition of mild steel in acidic solution by cow dung extract as an eco-friendly inhibitor

Design of a biodigester to treat cow dung in Botswana

  • Authors: Valela, Innocent , Muzenda, Edison
  • Date: 2019
  • Subjects: Biogas , Cow dung , Design
  • Language: English
  • Type: Conference proceedings
  • Identifier: http://hdl.handle.net/10210/403986 , uj:33871 , Citation: Valela, I. & Muzenda, E. 2019. Design of a biodigester to treat cow dung in Botswana.
  • Description: Abstract: The biogas potential of Botswana, a cattle rich nation is explored using dung as a substrate. Biogas could be a good renewable and clean substitute for other forms of energy in rural Botswana, however, the technical and socio-economic potential remains largely unexploited. In this study, the cattle dung was characterized, followed by a lab-scale experiments on the biogas potential yields from the dung. The bio-digester design was selected using the multi criteria decision analysis. From the six digester models that were evaluated for selection, the KVIC was found to be the most suitable with its size ranging from 10 to 100 m3. The bio-digester was subsequently designed using data and mathematical models obtained from literature. The biogas plant was designed for Lemcke’s cattle farm, the best selected site, with 5000 herds. The feedstock was found to have an in-situ density of 1410 kg/m3 with a total solids (TS) content of 18.9%, volatile solids (TS) content of 80%. The suitable digester size was found to be 20 m3. An energy audit showed that the plant had a potential to produce a surplus of 45.3 MWh of energy annually.
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