Optimising biogas production from anaerobic co-digestion of chicken manure and organic fraction of municipal solid waste
- Authors: Matheri, A. N. , Ndiweni, S. N. , Belaid, M. , Muzenda, E. , Hubert, R.
- Date: 2017
- Subjects: Anaerobic , Biogas , Co-digestion
- Language: English
- Type: Article
- Identifier: http://hdl.handle.net/10210/241017 , uj:24803 , Citation: Matheri, A.N. et al. 2017. Optimising biogas production from anaerobic co-digestion of chicken manure and organic fraction of municipal solid waste.
- Description: Abstract: In this study, it was observed that in experimental work under laboratory scale using conventional biochemical methane potential (BMP) assay, the loading rate ratio 4:1 had optimum biodegradability rate than other ratios which were investigated, while the loading rate ratio of 1:1 had optimum biogas and methane yield after 15 days hydraulic retention time. It was concluded that chicken waste (CM) monodigestion has higher biodegradability rate compare to organic fraction municipality solid waste (OFMSW) mono-digestion. Co-digestion of OFMSW and CM stabilizes conditions in digestion process such as carbon to nitrogen (C:N) ratio in the substrate mixtures as well as macro and micronutrients, pH, inhibitors or toxic compounds, dry matter and thus increasing biogas production. It was concluded that the organic waste generated in the municipal landfills could be co-digested with CM to produce methane which can be used as a source of environmentally friendly and clean energy for the transport sector, industries and residential homes.
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Waste to energy technologies from organics fraction of municipal solid waste
- Authors: Matheri, A.N. , Mbohwa, Charles , Belaid, M. , Seodigeng, T. , Ngila, J.C. , Muzenda, E.
- Date: 2016
- Subjects: Anaerobic , Co-digestion , Digesters
- Language: English
- Type: Conference proceedings
- Identifier: http://hdl.handle.net/10210/214143 , uj:21243 , Citation: Matheri, A.N. et al. 2016. Waste to energy technologies from organics fraction of municipal solid waste.
- Description: Abstract: With rapid economic growth and increased urbanization, South Africa faces the problem of municipal solid waste (MSW) disposal and pressing the need for waste to energy recovery. Nowadays, renewable energy is the key consideration in the discussion of the sustainable worldwide energy system that reduces global climate change, human health problems, and environmental degradation. Sustainable development requires the sustainable supply of clean and affordable renewable energy. The renewable energy source such as bioenergy, solar energy, wind energy, hydropower, geothermal is usually viewed as sustainable energy sources that drive economic development. Wastes are convertible to useful energy through waste to energy (WtE) technologies. In this study, renewable energy technologies from the organic fraction of municipal solid waste (OFMSW) and their relation to sustainable development are discussed. Via the application of the simple multi-attribute rating (SMART) technique of multiple-criteria decision analysis (MCDA) and analytical hierarchy process (AHP) as a decision support tool, the most preferred model option for WtE technology was selected from a list of potential alternatives available in the market base on environmental, sociocultural, technical and economical consideration. From our investigation into the City of Johannesburg Landfill, the OFMSW had the highest fraction that comprises of 34% in portion. From MCDA-AHP results, anaerobic digestion was the most preferred technology of choice, taking into consideration environmental preservation as the ultimate goal.
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Modelling the kinetic of biogas production from co-digestion of pig waste and grass clippings
- Authors: Matheri, Anthony Njuguna , Belaid, Mohamed , Seodigeng, Tumisang , Ngila, Catherine Jane
- Date: 2016
- Subjects: Anaerobic , Co-digestion , Kinetics , Mesophilic temperature , Modified gompertz
- Language: English
- Type: Conference proceedings
- Identifier: http://hdl.handle.net/10210/93635 , uj:20372 , Citation: Matheri, A.N. et al. 2016. Modelling the kinetic of biogas production from co-digestion of pig waste and grass clippings.
- Description: Abstract: This work investigated the use of laboratory batch anaerobic digester to derive kinetics parameters for anaerobic co-digestion of pig waste and grass clippings. Laboratory experiment data from 10 litres batch anaerobic digester operating at ambient mesophilic temperature of 37 0C and pH of 6.9 was used to derive parameters for modified Gompertz model. The carbon/nitrogen (C/N) ratio of Pig waste was found to be 16.16 and grass clippings to be 20.54. Through co-digestion in ratio of 1:1, the C/N ratio settled at 17.28. The actual biogas yield was found to be 7725 ml/g COD. In the model of biogas production prediction, the kinetics constants of A (ml/g COD), μ (ml/g COD. day), λ (day) was 7920.70, 701.35, 1.61 respectively with coefficient of determination (R2) of 0.9994. Modified Gompertz plot showed better correlation of cumulative biogas production and these results show biogas production can be enhanced from co-digestion of substrates.
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Design model selection and dimensioning of anaerobic digester for the OFMSW
- Authors: Matheri, Anthony Njuguna , Mbohwa, Charles , Seodigeng, Tumisang , Ngila, Jane Catherine
- Date: 2016
- Subjects: Belaid, Mohamed , Anaerobic , Co-digestion , Digester
- Language: English
- Type: Conference proceedings
- Identifier: http://hdl.handle.net/10210/214100 , uj:21236 , Citation: Matheri, A.N. et al. 2016. Design model selection and dimensioning of anaerobic digester for the OFMSW.
- Description: Abstract: In this study, we investigated the design model selection and dimensioning of the anaerobic digester for the codigestion of different organics fraction of municipal solid waste (OFMSW) originating from the city’s landfills. The waste quantification and characterization exercise were undertaken at the point of generation, so as to obtain the total amount of waste generated and to ascertain the waste composition. Via the application of the simple multi-attribute rating (SMART) technique of multiple-criteria decision analysis (MCDA) as a decision support tool base on cost, scalability, temperature regulation, ease of construction, operation, and maintenance. The most preferred model option for bioenergy design technology was selected from a list of potential alternatives available in the market. Continuous stirred tank reactor (digester) CSTR scored the highest with 79% and was selected for the design in OFMSW biogas production. The geometry of the biodigester parameters was comparable with the anaerobic digestion (AD) process.
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