Zeolitic mineral liner as hydraulic and buffering material
- Agbenyeku, Emmanuel Emem-Obong, Muzenda, Edison, Msibi, Innocent Mandla
- Authors: Agbenyeku, Emmanuel Emem-Obong , Muzenda, Edison , Msibi, Innocent Mandla
- Date: 2014
- Subjects: Leachate , Zeolites - Linings , Solid waste management , Hydraulics , Zeolites - Analysis
- Type: Article
- Identifier: uj:5093 , http://hdl.handle.net/10210/13683
- Description: Laboratory tests were done using a bespoke device to investigate landfill leachate seepage through a circular failed geocomposite liner. Pressures simulating actual landfill waste loads were applied to the lining system. The buffering capacity of a natural zeolitic mineral layer was investigated by measuring the leachate seepage rate and anionic (Cl and HCO3) contaminant transport through the geo-composite liner-buffering strata (BS). Simulated landfill waste loads from 25-150kPa were introduced to the system at intervals. The findings showed considerable reduction in seepage rate over the increased pressure. The seepage reduction is ascribed to the reduced liner transmissivity, θ and compressed soil layer. The natural zeolitic soil exhibited poor buffering of Cl ions but showed a fair outcome in the case of HCO3 ions. Data for seepage rates were compared with predicted values from existing equations by Forchheimer and Giroud. The comparisons showed inapplicability to this study and to real life scenarios, if conditions of perfect contact at the polyethylene/soil interface were assumed. Nonetheless, Giroud’s equation for good contact condition gave considerable seepage rate prediction through a failed geo-composite liner.
- Full Text:
- Authors: Agbenyeku, Emmanuel Emem-Obong , Muzenda, Edison , Msibi, Innocent Mandla
- Date: 2014
- Subjects: Leachate , Zeolites - Linings , Solid waste management , Hydraulics , Zeolites - Analysis
- Type: Article
- Identifier: uj:5093 , http://hdl.handle.net/10210/13683
- Description: Laboratory tests were done using a bespoke device to investigate landfill leachate seepage through a circular failed geocomposite liner. Pressures simulating actual landfill waste loads were applied to the lining system. The buffering capacity of a natural zeolitic mineral layer was investigated by measuring the leachate seepage rate and anionic (Cl and HCO3) contaminant transport through the geo-composite liner-buffering strata (BS). Simulated landfill waste loads from 25-150kPa were introduced to the system at intervals. The findings showed considerable reduction in seepage rate over the increased pressure. The seepage reduction is ascribed to the reduced liner transmissivity, θ and compressed soil layer. The natural zeolitic soil exhibited poor buffering of Cl ions but showed a fair outcome in the case of HCO3 ions. Data for seepage rates were compared with predicted values from existing equations by Forchheimer and Giroud. The comparisons showed inapplicability to this study and to real life scenarios, if conditions of perfect contact at the polyethylene/soil interface were assumed. Nonetheless, Giroud’s equation for good contact condition gave considerable seepage rate prediction through a failed geo-composite liner.
- Full Text:
Sustainability context analysis of municipal solid waste management in Harare, Zimbabwe
- Nhubu, Trust, Muzenda, Edison, Mbohwa, Charles, Agbenyeku, Emma
- Authors: Nhubu, Trust , Muzenda, Edison , Mbohwa, Charles , Agbenyeku, Emma
- Date: 2017
- Subjects: Solid waste management , Recycle , Reuse
- Language: English
- Type: Conference proceedings
- Identifier: http://hdl.handle.net/10210/250641 , uj:26121 , Citation: Nhubu, T. et al. 2017. Sustainability context analysis of municipal solid waste management in Harare, Zimbabwe. 2nd International Engineering Conference (IEC 2017) Federal University of Technology, Minna, Nigeria.
- Description: Abstract: Harare is experiencing enormous solid waste management challenges manifesting themselves in the form of both groundwater and surface water pollution leading to outbreak of water born diseases. The solid waste management infrastrucre in Harare was designed to cater for almost a third of the population it is currently serving. Heaps of illegally dumped solid waste has become daily eyesore. Numerous waste management studies carried in Harare highlighted the nature of the challenges being faced and recommended the need to have a waste management paradigm shift in the City. This study argues for the need to undertake simulation and laboratory based studies to develop and design waste management options for Combined Heat and Power Generation for the City. This paper argues that Harare could possibly use the energy generated from its waste on its water and wastewater treatment and other potential uses. Options for decentralized waste management systems unlike the current centralized system must also be incorporated in the simulation models and laboratory scale experiments where, waste sorting and separation might occur at source or a certain waste management boundary where, only that which is not fit for reuse and recycle will be transported to landfills.
- Full Text:
- Authors: Nhubu, Trust , Muzenda, Edison , Mbohwa, Charles , Agbenyeku, Emma
- Date: 2017
- Subjects: Solid waste management , Recycle , Reuse
- Language: English
- Type: Conference proceedings
- Identifier: http://hdl.handle.net/10210/250641 , uj:26121 , Citation: Nhubu, T. et al. 2017. Sustainability context analysis of municipal solid waste management in Harare, Zimbabwe. 2nd International Engineering Conference (IEC 2017) Federal University of Technology, Minna, Nigeria.
- Description: Abstract: Harare is experiencing enormous solid waste management challenges manifesting themselves in the form of both groundwater and surface water pollution leading to outbreak of water born diseases. The solid waste management infrastrucre in Harare was designed to cater for almost a third of the population it is currently serving. Heaps of illegally dumped solid waste has become daily eyesore. Numerous waste management studies carried in Harare highlighted the nature of the challenges being faced and recommended the need to have a waste management paradigm shift in the City. This study argues for the need to undertake simulation and laboratory based studies to develop and design waste management options for Combined Heat and Power Generation for the City. This paper argues that Harare could possibly use the energy generated from its waste on its water and wastewater treatment and other potential uses. Options for decentralized waste management systems unlike the current centralized system must also be incorporated in the simulation models and laboratory scale experiments where, waste sorting and separation might occur at source or a certain waste management boundary where, only that which is not fit for reuse and recycle will be transported to landfills.
- Full Text:
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