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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

A long-term acid mine drainage water management strategy for South Witbank Colliery, Mpumalanga

Janse van Rensburg, Renee 05 February 2009 (has links)
M.Sc. / Water is essential to life on our planet (Miller, 1999) because no living organism can survive without it (Kupchella & Hyland, 1993). Thus there is a demand for clean, unpolluted water to be in substantial supply. There is growing awareness worldwide of the environmental legacy of coal mining activities that have been undertaken with little concern for the environment (EMCBC, 2001). Coal mining by its nature consumes, diverts and can seriously pollute water resources (Miller, 1999). Acid mine drainage is a major problem on coalmines throughout the world (Kupchella & Hyland, 1993), and South Witbank Colliery, the main focus of this study, is no exception. Various studies that have been undertaken at South Witbank Colliery have shown that the water decanting from the mine is highly acidic (pH 2 – pH 4), and as such cannot be released into the natural watercourse (streams). Some form of water treatment to nullify or neutralise the acid levels of the mine water is necessary. Currently a temporary liming plant is being utilised to treat the water and to reduce its acidity levels to between pH 5.0 – pH 9.5, however, this plant is seen as a limited treatment option as it does not guarantee that the acidic nature of the water will be sufficiently nullified. This study endeavours to identify and analyse a variety of permanent, long-term water treatment methods relevant to acid mine water mitigation at South Witbank Colliery. Four long-term water treatment methods, namely artificial wetlands, anoxic limestone drains, transfer of water to a water treatment plant, and construction of a permanent liming facility at South Witbank Colliery, were identified and discussed. Artificial wetland technology has not been proven for treatment on such variable pollutant loads as present in the South Witbank Colliery mine water decant. A constraint to this technology also lies in its necessity for large surface area requirements, which is restricted due to site subsidence and sinkhole formation (as a result of shallow mining). This technology is also known to increase water evaporation rates, which may result in additional water removal from an already stressed resource. The anoxic limestone drain water treatment technology is considered unsuitable for the study area, ultimately due to it having more a pre-treatment functionality than a total treatment one. It is also limited due to its ability to address only certain water quality variables. If considered for use in a partnership with other acid mine drainage water treatment technologies, its use might be more viable than when considered as a stand-alone treatment technology. Transferring of the acid mine drainage water decant from South Witbank Colliery to a water treatment plant is a feasible option. The Brugspruit Water Pollution Control Works, operated by the Department of Water Affairs and Forestry, is the most likely option. The water treatment would become the responsibility of DWAF, thereby ensuring that the treated water is compliant with specified water quality standards and requirements. The attractiveness of this option is that it minimizes the short and long term water management requirements for South Witbank Colliery, but is ultimately dependant on a formal contract being negotiated between the relevant parties. Construction of a permanent liming facility at South Witbank Colliery is possible and, in comparison to the current temporary liming plant, is likely to treat the water adequately so as to comply with specified water quality standards and requirements. A permanent facility would allow for more water to be treated than is currently possible at the temporary liming plant. Due to this option being based on proven technology increases its feasibility in terms of use at South Witbank Colliery. Given that water is a scarce resource in South Africa, the implementation of these water treatment options is dependent on the acceptability of each option by the Department of Water Affairs and Forestry. Of the four treatment options identified the latter two, namely transfer of water to a water treatment facility and construction of a permanent liming plant, are considered to be the most suitable solutions for the treatment of acid mine drainage at South Witbank Colliery.
2

A regional, 3-D computer-based sedimentological model of the permian Witbank coalfield, South Africa

28 January 2009 (has links)
M.Sc. / The objective of this work is to establish a regional, three-dimensional sedimentological model of the clastic strata of the Vryheid Formation and pre-existing basin floor topography of the Witbank Coalfield, South Africa. This considers an area extending from 25°30’ S to 26°30’ S by 28°30’E to 30°E. This has been undertaken using computer modelling to examine the three-dimensional distribution of the sedimentary rocks. The basis for the geological model presented in this thesis is 1190 borehole logs collected from three mining companies involved in coal extraction in the study area, namely Anglo American Coal Corporation, Duiker Mining Limited and Ingwe Coal Corporation Limited. These borehole logs are converted to a common data format for inclusion into the 3-D model. These borehole logs are correctly positioned in space using a digital elevation model. The primary objective of this research was to visualize the interburden and overburden sedimentary rocks within the study area, so as to be able to understand the distribution and hence origin of these rocks. As commercially available modelling tools have several restrictions with respect to the current work, Geovision cc. was contracted to develop the tools needed for the geological visualization of the data. Using the three-dimensional model, the distribution of the various facies and facies associations can be defined, to understand the depositional history of the basin. These characteristics include the delineation of the general trend of the basement topography. The distribution of the lower glacial and paraglacial sedimentary rocks within the study in steep-sided palaeovalleys, marked by rapid facies and thickness changes from diamictite through argillite, and minor sandstones and conglomerates is shown in 3-D. Evidence of lobate deltas and bedload sandy river deposits between the No. 2 and No. 4 Seams is presented in 3-D. The 3-D characteristics of the rocks between the No. 4 and No. 5 Seams, proposed to represent a period of deltaic progradation during an overall marine transgression is described. By using a 3-D model it is possible to evaluate the distribution of sedimentary rocks, both through space and through time. These palaeoenvironmental interpretations facilitate a better understanding of the genesis of the Witbank Coalfield. Furthermore, this enhanced geological modelling can facilitate improved mine planning and mining techniques.
3

Sport and the development of new mining communities in the Witbank district

Mudau, Rudzani 05 June 2008 (has links)
This project was established with the aim of assessing the extent of the development of new mining communities and the extent to which sport has been involved in the development of new communities around the Witbank district. The development of this project was an endeavour to understand the extent of change in settlement practices of miners, a subject on which there is not much academic literature. From the earlier settlement of small-scale farmers in Witbank, coal mining sprouted. Until the 1980s, a large number of African workers on these mines were migrant labourers housed in single-sex compounds. When the National Union of Mineworkers (NUM) called for the abolition of hostels, the migrant system was seriously affected. With the decline of the migrant labour system, mine workers’ families have been settling with them in units located on or close to the mines. As compounds were converted into family units, African workers tasted the freedom of living with their families. The move from hostels to houses has led to the development of new ‘normal’ communities; ‘normal’ in the sense that they comprise men, women and children. The research shows that the development of new communities has not been automatic, but one that has relied, in particular, on the self-activity of the miners and their families, though often with support from colliery managers. As in the UK and US, various institutions have been involved in developing mining communities, and this study focuses on one of these, a sports association, specifically the Mpumalanga Collieries’ Human Resources Association (MCHRA). Whilst in many respects the new mining communities are similar to those considered in the UK and US, apartheid divisions continue to mark the geography of settlement, with class replacing race as the main marker of division. Sport is crucial in the secondary development of these communities; secondary in that it promotes social cohesion rather than gives rise to the emergence of communities. Nonetheless, sport has already shown its importance in Witbank. It does not only allow families to entertain themselves, but also gives the communities some escape-valve mechanism, as it keeps people busy and away from crime, drugs and alcohol abuse. This study provides valuable evidence of ordinary people taking responsibility for new social problems arising in the post-apartheid era, and they are doing this, in particular, through the mechanism of sport. / Prof. Peter Alexander Ms. Claire Ceruti
4

A practical theological study of the efficacy of the Roman Catholic Church, Witbank Diocese’s teaching regarding the healing ministry : towards the development of an integrated and intercultural healing ministry

Magagula, Vusumuzi Jan 11 1900 (has links)
Sickness is a problem that has not escaped any society and thus is on the agenda of every culture. Since time immemorial cultures have searched for answers to the questions raised by the phenomenon of sickness but none have provided solutions, as it has become clear that sickness is part of our human existence. Many people have resorted to religion in search consolation in times of affliction and the Roman Catholic Church is not immune to this expectation, as we see many leaving the church in search of healing in the African Traditional Religions and other Christian churches because they feel that the church is inadequately dealing with the problem. In this study the author undertakes a research journey within the Diocese of Witbank of the RCC to investigate as to why the church’s healing ministry is not effective. Through engagement with participants in the research field and relevant literature the author discovered that the RCC is seen to be suspicious of the African worldview and consequently does not take its members’ fears and frustrations around the phenomenon of sickness serious as it judges them to be superstitious. This suggests that there is nothing that Western Christianity can learn from African cultures maintaining its superior attitude and further alienating indigenous communities. The author suggests that in order for the RCC to responds with relevance to this problem it needs to reconcile the Christian worldview, which is western, with the African worldview. He puts high on the agenda of Christian theology the urgent call to African theologians to develop an African theology that will give birth to a genuine African Christianity. In conclusion as a solution the author proposes an integrated and intercultural healing ministry for the Diocese of Witbank. This model is aimed at appropriating African values, idioms and language in the RCC to create an atmosphere where the church is seen as a welcome guest who comes bearing gifts but at the same time expects to be taken care of by its host. / Philosophy, Practical and Systematic Theology / M. Th. (Pastoral Therapy)

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