A discussion on waste generation and management trends in South Africa
- Authors: Muzenda, Edison
- Date: 2014
- Subjects: Waste management - South Africa , Solid waste management - South Africa , Integrated Industry Waste Tyre Management Plan
- Type: Article
- Identifier: uj:4762 , ISSN 2320–4087 , http://hdl.handle.net/10210/11871
- Description: This paper, a continuation and expansion of the work of Muzenda et al, 2012 [1] looks at the management trends in South Africa. It focuses on waste classification, hierarchy, generation and management. The waste tyre problem in South Africa is also briefly discussed. Solid waste management is a growing environmental problem in developing countries such as South Africa. The increasing standard of living and economic growth results in challenges in the management of both general and hazardous waste. Landfill sites life spans have been reduced and hence the need for waste minimization, utilization and alternative disposal methods. Waste tyre management is challenge as they are non compactable and non-biodegradable. The REDISA Integrated Industry Waste Tyre Management Plan (IIWTMP) approved by Environmental Affairs Minister, Edna Molewa, and published in the Government Gazette [No. 35927] in November 2012 support and promote tyre recycling, providing the collection and depot infrastructure required to collect waste tyres from across the entire country and deliver them to approved recyclers. The objectives of this paper were achieved through a literature review and analysis.
- Full Text:
- Authors: Muzenda, Edison
- Date: 2014
- Subjects: Waste management - South Africa , Solid waste management - South Africa , Integrated Industry Waste Tyre Management Plan
- Type: Article
- Identifier: uj:4762 , ISSN 2320–4087 , http://hdl.handle.net/10210/11871
- Description: This paper, a continuation and expansion of the work of Muzenda et al, 2012 [1] looks at the management trends in South Africa. It focuses on waste classification, hierarchy, generation and management. The waste tyre problem in South Africa is also briefly discussed. Solid waste management is a growing environmental problem in developing countries such as South Africa. The increasing standard of living and economic growth results in challenges in the management of both general and hazardous waste. Landfill sites life spans have been reduced and hence the need for waste minimization, utilization and alternative disposal methods. Waste tyre management is challenge as they are non compactable and non-biodegradable. The REDISA Integrated Industry Waste Tyre Management Plan (IIWTMP) approved by Environmental Affairs Minister, Edna Molewa, and published in the Government Gazette [No. 35927] in November 2012 support and promote tyre recycling, providing the collection and depot infrastructure required to collect waste tyres from across the entire country and deliver them to approved recyclers. The objectives of this paper were achieved through a literature review and analysis.
- Full Text:
Aromatic compounds and ester polymeric solvents interactions
- Authors: Muzenda, Edison
- Date: 2014
- Subjects: Activity coefficients , Aromatic compounds , Esters , Solubility , Volatile organic compounds
- Type: Article
- Identifier: uj:4771 , ISSN 2320–4087 , http://hdl.handle.net/10210/11946
- Description: This work focused on the interactions that occur between ester polymeric solvents and simple aromatic volatile organic compounds (VOCs). Solutes were selected from various functional groups in their simplest form and computations of infinite dilution activity coefficients were performed using the Modified UNIFAC Dortmund group contribution model using a Microsoft Excel spreadsheet designed for this purpose. For polar aromatic VOCs, solubility decreased with increase in size of the ester solvent molecule and the opposite behavior was observed for non-polar VOCs. For all aromatic - ester solvent interactions, solubility increased with the increase in the degree of ester unsaturation.
- Full Text:
- Authors: Muzenda, Edison
- Date: 2014
- Subjects: Activity coefficients , Aromatic compounds , Esters , Solubility , Volatile organic compounds
- Type: Article
- Identifier: uj:4771 , ISSN 2320–4087 , http://hdl.handle.net/10210/11946
- Description: This work focused on the interactions that occur between ester polymeric solvents and simple aromatic volatile organic compounds (VOCs). Solutes were selected from various functional groups in their simplest form and computations of infinite dilution activity coefficients were performed using the Modified UNIFAC Dortmund group contribution model using a Microsoft Excel spreadsheet designed for this purpose. For polar aromatic VOCs, solubility decreased with increase in size of the ester solvent molecule and the opposite behavior was observed for non-polar VOCs. For all aromatic - ester solvent interactions, solubility increased with the increase in the degree of ester unsaturation.
- Full Text:
Green supply chain management in construction industries in South Africa and Nigeria
- Ojo, Elizabeth, Mbohwa, Charles, Akinlabi, Esther Titilayo
- Authors: Ojo, Elizabeth , Mbohwa, Charles , Akinlabi, Esther Titilayo
- Date: 2014
- Subjects: Green supply chain management - South Africa , Green supply chain management - Nigeria , Construction industry - South Africa , Construction industry - Nigeria
- Type: Article
- Identifier: uj:5192 , ISSN 2320–4087 , http://hdl.handle.net/10210/14435
- Description: The trend towards developing green supply chain is now gaining popularity among different industries and research with significant environmental management tools to address these problems. This paper is based on literature review of the green supply chain management practices in construction industries in two countries, South Africa and Nigeria.
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- Authors: Ojo, Elizabeth , Mbohwa, Charles , Akinlabi, Esther Titilayo
- Date: 2014
- Subjects: Green supply chain management - South Africa , Green supply chain management - Nigeria , Construction industry - South Africa , Construction industry - Nigeria
- Type: Article
- Identifier: uj:5192 , ISSN 2320–4087 , http://hdl.handle.net/10210/14435
- Description: The trend towards developing green supply chain is now gaining popularity among different industries and research with significant environmental management tools to address these problems. This paper is based on literature review of the green supply chain management practices in construction industries in two countries, South Africa and Nigeria.
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Volatile organic compounds – polymeric solvents interactions – a thermodynamic computational attempt
- Authors: Muzenda, Edison
- Date: 2014
- Subjects: Phase equilibrium , Solubility , Volatile organic compounds , Normal methyl pyrrolidone
- Type: Article
- Identifier: uj:4770 , ISSN 2320–4087 , http://hdl.handle.net/10210/11945
- Description: This work attempted to model the phase equilibrium involving 50 volatile organic compounds (VOCs) with furfural and normal methyl pyrrolidone (NMP). Polar furfural and dipolar aprotic NMP were tested in this work as potential solvents for the abatement of selected VOCs through physical absorption. Five (5) VOC family groups were studied namely alkanes, alkenes, alcohols, aldehydes and carboxylic groups. The modified UNIFAC Dortmund and Lyngby were used in the phase equilibrium computation. NMP showed better absorption affinity for alkenes, alcohols and carboxylic acids compared to furfural. The solubility decreased with increase in size of the VOCs for both solvents.
- Full Text:
Volatile organic compounds – polymeric solvents interactions – a thermodynamic computational attempt
- Authors: Muzenda, Edison
- Date: 2014
- Subjects: Phase equilibrium , Solubility , Volatile organic compounds , Normal methyl pyrrolidone
- Type: Article
- Identifier: uj:4770 , ISSN 2320–4087 , http://hdl.handle.net/10210/11945
- Description: This work attempted to model the phase equilibrium involving 50 volatile organic compounds (VOCs) with furfural and normal methyl pyrrolidone (NMP). Polar furfural and dipolar aprotic NMP were tested in this work as potential solvents for the abatement of selected VOCs through physical absorption. Five (5) VOC family groups were studied namely alkanes, alkenes, alcohols, aldehydes and carboxylic groups. The modified UNIFAC Dortmund and Lyngby were used in the phase equilibrium computation. NMP showed better absorption affinity for alkenes, alcohols and carboxylic acids compared to furfural. The solubility decreased with increase in size of the VOCs for both solvents.
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