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Effects of diffuse effluents from Botshabelo on the microbiological quality of water in the Modder River

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dc.contributor.author Jagals, Paul
dc.contributor.other Bloemfontein: Central University of Technology, Free State
dc.date.accessioned 2017-04-25T09:50:09Z
dc.date.available 2017-04-25T09:50:09Z
dc.date.issued 1994
dc.identifier.uri http://hdl.handle.net/11462/914
dc.description Thesis en_US
dc.description.abstract The value of selected indicator micro-organisms for assessment of faecal pollution of water, as well as the distinction of faecal pollution of animal or human origin of pollution, has been investigated. The following indicators were included: faecal coliform bacteria, faecal streptococci, sorbitol-fermenting bifidobacteria, Rhodococcus coprophilus, somatic and male-specific coliphages and phages of Bacteroides tragilis. Comparative tests were carried out on water samples collected from a stream and river, and their respective catchments, exposed to predominantly faecal pollution of domestic animal origin. The same stream and river with catchments, were sampled after downstream exposure to run-off from a low socioeconomic developing settlement with restricted sanitation. Samples were collected from perennial flow in the stream and river during the dry season and from storm water run-off during general rain and immediately after thunder storms. Storm water run-off reached faecal coliform counts of up to 4 400 000 per . 100 ml, which is equivalent to that of many sewage effluents. Faecal pollution of the aquatic environment was less during the dry season. Sorbitol-fermenting bifidobacteria were identifiable with faecal pollution of human origin, and R coprophi/us with that of animal origin. Male specific coliphages were identifiable with sewage pollution as well as general faecal pollution of water. Certain selected ratios for the indicator organisms indicated possible distinction between faecal pollution of human origin and faecal pollution predominantly of animal origin under certain circumstances. Phages of B tragi/is were not detected in any of the samples, which implies that their application in this situation would require more sensitive techniques. The results show that the run-off from the developing settlement constituted a major source of pollution for a river catchment which downstream is used as a source of water for human consumption and that faecal pollution of human and animal origin can reliably be distinguished by means of combinations of appropriate indicators. en_US
dc.format.mimetype Application/PDF
dc.language.iso en_US en_US
dc.publisher Bloemfontein: Central University of Technology, Free State
dc.subject Water quality - South Africa - Modder River en_US
dc.subject Modder River (South Africa) - Quality control en_US
dc.subject Water - Pollution - South Africa - Modder River en_US
dc.subject Diffuse effluents en_US
dc.subject water quality indicators en_US
dc.subject human pollution en_US
dc.subject pathogens en_US
dc.title Effects of diffuse effluents from Botshabelo on the microbiological quality of water in the Modder River en_US
dc.type Thesis en_US
dc.rights.holder Central University of Technology, Free State

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