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Recycling of construction and demolition waste (CDW) towards sustainable beneficial outcomes

  • Authors: Agbenyeku, E. Emmanuel , Aigbavboa, Clinton
  • Date: 2015
  • Subjects: Landfill , Recycling , Construction and Demolition Waste
  • Language: English
  • Type: Conference proceedings
  • Identifier: http://hdl.handle.net/10210/72824 , uj:18333 , Citation: Agbenyeku, E.E. & Aigbavboa, C. 2015. Recycling of construction and demolition waste (CDW) towards sustainable beneficial outcomes.
  • Description: Abstract: Population growth, industrialization and infrastructure development have continued to result in large amounts of construction and demolition waste (CDW) been dumped in landfills. The various enormous construction, demolition, remodeling, restructuring, renovation and repairs on domestic and industrial buildings as well as projects on infrastructure growth generate vast amounts of CDW considered low risk but of high volume. In South Africa and other African countries, CDW often ends up in landfills for lack of feasible recycling and reuse options. Considering the quantity of CDW insistently generated, it is expected that these wastes are converted to wealth if appreciated as useful resource for energy recovery, recycling or reuse. The need for recycling and reuse alternatives have increased in recent years with pressing concerns on the impacts of landfill disposal of CDW on the environment and human health. Irrespective of growing concerns, it is clear that landfilling will remain the main waste management disposal system for CDW in the foreseeable future. Hence, the study pinpoints the importance of recycling and reusing CDW towards beneficial outcomes. CDW can be profitably harnessed if properly sorted, crushed and sieved using the cheapest appropriate technology possible for concrete works. If well established, recycling and reuse alternatives can be efficiently implemented by incorporation into concrete technology with keen eyes for low cost housing schemes for social benefits.
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Environmental concern of South African cohorts : an exploratory study

  • Authors: Berndt, Adele , Petzer, Danie
  • Date: 2011-09
  • Subjects: Environmental attitudes , Environmental awareness , Recycling
  • Type: Article
  • Identifier: uj:5772 , ISSN 1993-8233 , http://hdl.handle.net/10210/7779
  • Description: Environmental issues receive ever increasing attention in society and a general level of concern is expressed in the society, yet specific action-related programmes (such as recycling campaigns) do not experience the success that could be expected, given the level of attention and concern. This poses questions regarding the awareness and actions towards environmental issues. These are however, influenced by attitudes, making them critical. The focus of this quantitative study was to investigate the attitudes (and their components) of South Africans towards environmental and recycling issues. The study was conducted among a convenience sample of 139 respondents using a self administered paper-based survey. The findings show that respondents exhibited relatively positive attitudes towards environmental issues. No significant differences were, however, found between groups based upon gender or income, while significant differences were found between older and younger respondents. This paper indicates that organisations involved in environmental issues (including recycling) can harness positive attitudes to increase the success of programmes that are introduced.
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Trying to recycle household waste and feelings of guilt : a moderated mediation model applied to an emerging market

Recycling spent lead-acid battery into lead halide for resource purification and multifunctional perovskite diode

Assessing green practices awareness among fruit and vegetable street vendors in Johannesburg

  • Authors: Kalitanyi, Vivence
  • Date: 2021
  • Subjects: Fruit and vegetables , Green practices , Recycling
  • Language: English
  • Type: Journal article
  • Identifier: http://hdl.handle.net/10210/494063 , uj:44820 , Citation: Kalitanyi, V., 2021. Assessing green practices awareness among fruit and vegetable street vendors in Johannesburg. Journal of Contemporary Management, 18(2), pp.257-281. , DOI: https://doi.org/10.35683/jcm21010.12 , ISSN: 1815-7440
  • Description: Abstract: Purpose of the study: Street vending is becoming more popular and is an essential service mostly in the cities or towns of developing countries. The aim of this study was to investigate how well/much fruit and vegetable street vendors in Johannesburg are aware of green practices when conducting their businesses. Design/methodology/approach: In conducting this study, face-to-face interviews with open-ended questions were used. Semi-structured interviews consisting of eight questions were conducted among ten fruit and vegetable street vendors, comprising six males and four females. The interview questions explored matters concerning hygiene or green practices, regulations to follow when doing business, as well as recycling, reducing and reusing of materials. Findings: Findings from this study indicate that most fruit and vegetable street vendors in Johannesburg are not aware of green practices and the regulations for conducting their businesses. Furthermore, the data collected show that not many street vendors selling fruit and vegetables reduce their waste materials; however, they do recycle and reuse some of the materials they use. Recommendations/value: the study mainly recommends the emphasis on educating streets vendors on the importance and benefits of protecting their operating environment, as well as the government to enforce rules and regulations of environment protection. Managerial implications: studies such as this current widen the management scope and suggest that informal trading organisations should form their own management in their areas of operations.
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Circular economy ownership models : a view from South Africa industry

Environmental perception, awareness and behaviour of households in the Johannesburg Metropolitan Area

  • Authors: Mnisi, Nomasonto D.
  • Date: 2012-06-07
  • Subjects: Environmental awareness , Environmental behaviour , Recycling , Households - Environmental aspects
  • Type: Mini-Dissertation
  • Identifier: uj:8663 , http://hdl.handle.net/10210/5019
  • Description: M.Sc. , In daily life, many of our experiences and much of the information directed at us relate to the poor state of the environment and the inadequate attempts of humankind to deal with it. Yet little attention is given to environmental hazards and environmental awareness at the level of the individual household. It is increasingly evident that the quality of our environment is being degraded. The poor state of the environment at the household level is generally associated with racial and ethnic differences, which in turn impact upon socio-economic conditions, which may be attributed in part to environmental injustice, whereby different sectors of the population experience differential exposure to environmental hazards. This study concentrates on the spheres of environmental perception, knowledge and behaviour on the household resolution level. The demographic factors of gender and race and the economic factor of household monthly expenditure are the selected variables used to determine whether these factors do in fact influence the variations in environmental perception, awareness and behaviour in the case of a sample of household respondents in the Johannesburg Metropolitan Area. An analysis was performed on the data collected during the General Household Survey (GHS) (2006), which was conducted by Statistics South Africa. The survey, using a stratified random sample, was conducted on 873 households in the study area. The findings of the study revealed differences in the number and range of concerns raised by male and female respondents on the reported environmental issues. Male respondents are more conscious than females about environmental issues. It was also found that there are significant variations in the level of awareness between male and female respondents with respect to environmental recycling programmes. More male respondents engage in recycling behaviour than is the case with their female counterparts. Respondents from Black population were more inclined to show concern for a wider range of environmental problems than was the case in the other racial groups. Waste is perceived as the most significant environmental problem for racial groups across the board in the Johannesburg Metropolitan Area. Variations were observed in the level of awareness concerning operative recycling programmes in the communities and also in the resultant behaviour with respect to the environment across the racial groups. The number of environmental problems reported as being perceived across the monthly expenditure groups varies between the limited and moderate spending groups. Respondents limited in their monthly expenditure expressed their concern for the physical environment, while high-spending household respondents were more inclined to be concerned about land degradation. It was observed that the level of environmental awareness tends to increase with an increase in monthly expenditure. Furthermore, the findings of the study indicate that an increased level of awareness of community recycling programmes does not necessarily translate into positive behaviour to improve and upgrade the environment, as in the case of collecting waste for recycling.
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Constraints driven reverse logistics model for Plastic Solid Waste (PSW)

Reverse logistics framework for PET bottles

  • Authors: Mwanza, Bupe Getrude , Mbohwa, Charles , Telukdarie, Arnesh
  • Date: 2016
  • Subjects: Reverse logistics , Polyethylene Terephthalate bottles , Recycling , Plastic bottles
  • Language: English
  • Type: Conference proceedings
  • Identifier: http://hdl.handle.net/10210/218013 , uj:21717 , Citation: Mwanza, B.G., Mbohwa, C. & Telukdarie, A. 2016. Reverse logistics framework for PET bottles.
  • Description: Abstract: Reverse logistics (RL) is an engineering strategy used by manufacturing companies to develop environmental sustainability through recycling. The result of not having appropriate legislation and frameworks in Zambia, specific to RL for plastic bottles, huge volumes of Polyethylene Terephthalate (PET) bottles are dumped on the Environment. Only 30% of the waste generated, in Zambia, is collected for disposal in dumpsites and the remaining 70% is not recovered. Of the 30% waste collected, there is no data to indicate the exact amount of PET bottles disposed. This paper focuses on analyzing RL activities performed by beverage manufacturing companies in conjunction with community involvement. Examining the regulations set by the regulatory bodies in monitoring waste management issues. Three separate questionnaires are issued, one for the beverage companies, one for the regulatory body and one for the municipality. Structured interviews and direct observations were also used. The results indicate that, RL of PET bottles is not practiced by the beverage companies. However the companies recognize the importance of recycling PET plastic bottles and have printed symbols of recycling on their bottles. Measures taken to protect the environment indicate regulations from the regulatory body are in place though not effectively enforced on PET plastic waste This paper focuses on analyzing the data collected via the three tier questionnaires and providing some insights into options to implement RL, within the Zambian constraints. A Container Deposit logistics Refund Legislation (CDRL) framework was developed and proposed for use in the recovery of PET bottles and any other recyclables.
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Carbon footprint analysis of fibre reinforced composite recycling processes

  • Authors: Shuaib, Norshah Aizat , Mativenga, Paul Tarisai
  • Date: 2017
  • Subjects: Composites , Recycling , Carbon footprint
  • Language: English
  • Type: Conference proceedings
  • Identifier: http://hdl.handle.net/10210/246268 , uj:25525 , Citation: Shuaib, N.A. & Mativenga, P.T. 2017. Carbon footprint analysis of fibre reinforced composite recycling processes. International Conference on Sustainable Materials Processing and Manufacturing, SMPM 2017, 23-25 January 2017, Kruger National Park
  • Description: Abstract: Global rise of composite material demand has led to major legacy problems of manufacturing and end of life waste. The heterogeneous nature of composite material is the main challenge for recycling. In the European Union, tighter legislation on landfill, increasing landfill tax and loss of valuable material are driving the need for development of composite recycling technology. However, the recycling environmental benefits may not be optimised due to lack of high integrity environmental datasets. This study considered mechanical, high voltage fragmentation (HVF) and chemical recycling methods. New carbon footprint models were developed for each process. Experimental modelling was used to provide detailed process data associated with the processes. The Environmental Product Declaration (EPD) of the processes were evaluated through life cycle assessment studies. This work identifies that the electricity energy demand dominates the overall resource footprint in mechanical and HVF recycling methods. For both processes, extended tool life and optimised processing rate could significantly reduce the carbon footprint per unit of weight of waste processed. Environmental impact of the chemical recycling method was highly dominated by acetone used as the solvent. The refined datasets generated in this study enable better resource analysis to minimise carbon footprint of composite recycling processes. This is hoped to help increase market value of the recyclates by highlighting the environmental benefits gained through potential reuse applications.
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The potential economic contribution of mine waste to environmental rehabilitation

  • Authors: Van Heerden, Jeanne
  • Date: 2009-02-02T07:16:04Z
  • Subjects: Mineral industries , Waste disposal , Recycling
  • Type: Thesis
  • Identifier: uj:14871 , http://hdl.handle.net/10210/1991
  • Description: M.Sc. , There has been significant development of new technology for the economic use of mining waste within recent years. The application of these new technologies makes the process of environmental rehabilitation less of a profit loss to mining companies and motivates them to take part in environmental rehabilitation. Apart from the financial benefit through redemption of costs, the economic use of mining waste, especially in the case of retreatment operations, may lead to the removal of waste from site, the removal of harmful substances, the recovery of economic minerals and job creation. The importance of the development and application of these technologies is emphasised through consideration of the different impacts of mining on the environment, the requirements by new environmental laws concerning mining activities in South Africa and the economic survival of the mining industry. This paper discusses the currently available and developing technologies to utilise mine waste economically by highlighting some of the most significant developments over the years. The paper then focuses on the uses of coalmine waste and associated regulations implemented to promote its economic use. The paper then continues to discuss other technology and techniques that can be applied to facilitate the economic use of mining waste. Lastly the paper examines whether mining companies in Gauteng and a few coal mines outside Gauteng are applying any of these technologies or are using their waste economically in other ways.
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