Pollution pattern in the Mokuro dam in Ile-Ife
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Date
1984
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
Microbiology, Obafemi Awolowo University
Abstract
distribution system were carried out from December 1982 to November 1983 at monthly
intervals, and the quality of water was assessed to establish the pollution pattern.
Generally, the population density of aerobic heterotrophic bacteria varied between wet and
dry seasons., While thorn was an increase in the mean monthly population of bacteria from
4.2 x 102/ml in November to 4.8 x 106/ml in February (i.e. dry season) there was a
comparative decrease from 11.0 x 106/ml in June to 1.8 x 103/ml in October (i.e. rainy
season), in the distribution system In the stream and in the dam, the seasonal trends of total
aerobic bacterial distribution followed more or less the same pattern as in the distribution
system. In the dam, the faecal coliform populations ranged from zero to 33 MPN/100 ml
during the rainy season and from 2 to 221 MPN/100ml in the dry season. The same pattern
was observed in the distribution system. Both faecal streptococci and Clostridium
perfringens were also detected in the water samples with no definite pattern of population
distribution between the seasons. The mean monthly faecal streptococci ranged from zero to
2.8 x 10 4/mt, while Clostridium perfringens ranged from zero to 538 MPN/100ml.
Nitrate, phosphate, chloride and dissolved solid levels were generally low. These compounds
ranged from zero to 1.16 mg/l; from zero to 0.038 mg/I, from 3.6 to 54 mg /l, and from
0.0001 to 0.058 g/100ml, respectively. The BOD varied with a range of 1.0 to 12.6mg /l in
the dam. In the distribution system, the chlorine residual was generally below 1mg/l,
decreasing with distance away from the chlorination point.
Description
159p
Keywords
Pollution, Chlorination, Population density
Citation
Petters, H.I. (1984). Pollution pattern in the Mokuro Dam in Ile-Ife. obafemi Awolowo University.