Analysis of the biogas productivity from dry anaerobic digestion of organic fraction of municipal solid waste
- Authors: Matheri, Anthony Njuguna , Sethunya, Vuiswa Lucia , Belaid, Mohamed , Muzenda, Edison , Ntuli, Freeman
- Date: 2017
- Subjects: BMP , Biodegradable , Co-digestion
- Language: English
- Type: Article
- Identifier: http://ujcontent.uj.ac.za8080/10210/380169 , http://hdl.handle.net/10210/241025 , uj:24804 , Citation: Matheri, A.N. 2017. Analysis of the biogas productivity from dry anaerobic digestion of organic fraction of municipal solid waste.
- Description: Abstract: In this study, it was observed that in experimental work under laboratory scale using conventional biomethane potential (BMP) analyser under the mesophilic optimum temperature of 37 0C and pH of 7. Organic fraction municipality solid waste (OFMSW) inoculated with cow manure had higher biodegradability rate leading to high methane production under shorter hydraulic retention rate. The co-digestion of OFMSW and cow manure stabilises 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 methane production. It was concluded that the organic waste generated in the municipality co-digested with manures to produce methane can be used as a source of sustainable renewable energy.
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The production methods and materials ratio effect on the mechanical and physical properties of bamboo-plastic waste composites use for infrastructure development
- Authors: Akwada, D.R. , Compression Moulding Economic Importance
- Date: 2016
- Subjects: Biodegradable , Construction
- Language: English
- Type: Conference proceedings
- Identifier: http://hdl.handle.net/10210/92357 , uj:20220 , Citation: Akwada, D.R., & Akwada, D.R. 2016. The production methods and materials ratio effect on the mechanical and physical properties of bamboo-plastic waste composites use for infrastructure development.
- Description: Abstract: Plastic waste management has become a major concern environmentally across the globe, especially in developing countries. Plastic waste is synthetic and non-degradable material. However, it has great economic importance when recycle and used with other environmentallyfriendly materials to produce composites for structural engineering works. The production and application of this product will minimise the environmental problems of plastic waste. The usage of this composite material globally, will help reduce the high dependency on the limited forest timbers of soft and hardwoods. Bamboo fibre and plastic waste can be used to produce this composite which will be used for all load carrying elements. Bamboo fibre as reinforcement in polymers is on the increase because is biodegradable and environmentally friendly. This study looks at the effects of the production methods and the materials ratio effect on the mechanical and the physical properties of bamboo fibre and plastic waste composites boards. The fibres were extracted by mechanical method, whilst the wastes plastics are clean, dried and shredded before melting to mix with the fibres. The molten plastics wastes were poured into moulds mixed with fibres and then allowed to cool completely, after removed from the case of open casting. In compression moulding, the mould charge was pressed using the mould cover. Water absorption, bending strength, impact strength and thickness swelling were carried according to standard measures. The fibre content and production method influenced the mechanical and physical properties of the composites. Higher fibre content in the composite resulted in higher water absorption and thickness swelling. It was observed that water absorption was significantly influenced by the fibre content at α = 0.05. The hydrophilic nature of the fibres has increased water absorption and thickness swelling significantly leading to dimensional instability of the composites. Moulded composites showed better physical properties than open casting method, possibly due to reduced void space during polymerization. These tests suggested that reducing void space and incorporating fibres into the plastic improves the end use properties. These findings could be used to develop alternative materials for construction and manufacturing industries where load bearing is required.
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