Liner-leachate interaction curve models for clayey soils from landfills around the City of Johannesburg
- Authors: Agbenyeku, Emem-Obong Emmanuel , Muzenda, Edison , Msibi, Mandla Innocent
- Date: 2017
- Subjects: Atterberg Limits , Clayey Soils , Landfill
- Language: English
- Type: Conference proceedings
- Identifier: http://hdl.handle.net/10210/250694 , uj:26130 , Citation: Agbenyeku, E.E., Muzenda, E. & Msibi, M.I. 2017. Liner-leachate interaction curve models for clayey soils from landfills around the City of Johannesburg. 2nd International Engineering Conference (IEC 2017) Federal University of Technology, Minna, Nigeria.
- Description: Abstract: The study presented herein links to a regression analysis that ties into three mathematical models from the Brutsaert, Mualem and Burdine equations respectively. The paper describes a series of experimental investigations on the characteristic permeation and interaction of three clayey soil types as barrier liners with landfill leachate from around the City of Johannesburg (CoJ), South Africa. From the outcomes therefrom, sequence of logarithmic relationships were projected towards proposing rational approximations of the best curve-fitting bounds using the Grain Size Distribution (GSD) and Atterberg Limits (AL) of the respective soils as selected classification properties. The outcomes which generally revealed reasonable indicative values were expressed using the weighted Plasticity Indices (PI) of the respective soils in conformance to Sitarenios et al. The two curve-fitting parameters x and z incorporated to simulate the Liner-Leachate Interaction Curve (LLIC) of the three clayey soils sampled from respective landfills around the CoJ, South Africa yielded 118, 0.6; 1211, 0.6; 1058, 0.6 in the Brutsaert model, 0.1, 1.2; 0.0, 1.5; 0.0, 1.5 in the Mualem model and 0.1, 2.4; 0.0, 2.6; 0.0, 2.7 in the Burdine model for samples A, B and C respectively, with a general R2 value of 0.904.
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Environmental contamination threat from the deposition of construction and demolition waste (CDW)
- Authors: Agbenyeku, Emmanuel Emem-Obong , Muzenda, Edison , Msibi, Innocent Mandla
- Date: 2016
- Subjects: Construction and demolition waste , Effluent , Landfill
- Language: English
- Type: Conference proceedings
- Identifier: http://hdl.handle.net/10210/215494 , uj:21423 , Citation: Agbenyeku, E.E., Muzenda, E & Msibi, I.M. 2016. Environmental contamination threat from the deposition of construction and demolition waste (CDW).
- Description: Abstract: Growing population, industrialization and infrastructure development have resulted in enormous waste generation over the past decades. The disposal of vast amounts of waste remains a major challenge. However, in the globalized world recycling has become a main option for managing wastes while in other parts of the globe, landfilling is done due to waste handling difficulties. South Africa is one of many countries where landfilling activities is high, as roughly 75% of daily generated solid waste is disposed in landfills. This includes massive amounts of construction and demolition wastes (CDW) from reconstruction and development activities. South Africa depends on landfilling as a system of waste management which in the foreseeable future would linger till feasible recycling options are initiated. As such, the generation and seepage of leachate into soil, water reserves is probable in such dump sites due to exposure of the waste bodies to rain and run-offs. A bespoke device was used in the study to investigate the impacts of disposing CDW in open dumps paying mind to an unlined site relying on the geology of the area as worst case scenario. To generate leachate, the device was coupled with CDW in a bottom chamber and de-ionized water percolated the system from a reservoir. Arsenic, Copper and Chromium from the generated leachate effluent were analyzed by full spectral method and were compared to the South African standard of drinking water. Targeted ions were found to decrease over the testing period and it was however, clear that improper disposal of CDW could have consequential impacts on human and environmental health.
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Biochemical methane potential of OFMSW for City of Johannesburg
- Authors: Maile, Ireen , Muzenda, Edison , Mbohwa, Charles
- Date: 2016
- Subjects: Anaerobic digestion , Landfill , Methane potential
- Language: English
- Type: Conference proceedings
- Identifier: http://hdl.handle.net/10210/216566 , uj:21522 , Citation: Maile, I., Muzenda, E. & Mbohwa, C. 2016. Biochemical methane potential of OFMSW for City of Johannesburg.
- Description: Abstract: The accumulation of Organic Fraction of Municipal Solid Waste (OFMSW) in landfills not only pose threat to the environment, it may also lead to potential health hazards. Anaerobic digestion stands a very good chance to mitigate this waste accumulation in landfills and has potential to create green jobs. BMP has been widely studied in anaerobic digestion for the production of sustainable energy. Bioprocess control Automatic Methane Potential Test System (AMPTS) II machine was used to set up the assays and run the tests. OFMSW was observed to have a low pH which affects the production process and biogas yield. Buffer solutions that were used in this study were calcium carbonate (CaCO3) and sodium hydroxide (NaOH). It was observed that CaCO3 not only stabilizes the pH but it also gives nutrients to the microbes and thus results in higher biogas yields. Inoculation also helped in stabilizing the process and improved the yield. The digester with CaCO3 resulted in a higher methane yield than the others. Though CaCO3 gave good results its use was discontinued as it has a negative impact on the environment. The BMP of OFMSW was found to be 200 ml CH4 / g VS. The methane content was found to be on average 58%.
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Design considerations for an engineered landfill
- Authors: Manyuchi, Musaida Mercy , Mbohwa, Charles , Muzenda, Edison
- Date: 2017
- Subjects: Design considerations , Landfill , Leachate control
- Language: English
- Type: Conference proceedings
- Identifier: http://hdl.handle.net/10210/260152 , uj:27385 , Citation: Manyuchi, M.M., Mbohwa, C. & Muzenda, E. 2017. Design considerations for an engineered landfill.
- Description: Abstract: An engineered landfill presents an opportunity for proper waste management that allows resource recovery from waste. However, for this to be achieved several technical parameters must be considered when designing a sanitary landfill. These technical parameters include proper site selection with minimal environmental and hydrological negative impacts, selection of a liner network that will not allow the leachate to infiltrate into the ground. Furthermore, there is need to have an integrated network for monitoring the movement of the waste as well as quality of the leachate. The surface drainage at a landfill site must also be well understood as well as daily covering measures to avoid pests and pathogens coming outside the designated landfill site. Although, landfills present a potential for proper municipal waste management, the human capital aspect is also critical and must be considered.
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