By Klein Gomes

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Aesthetic considerations, for example, should largely be satisfied. Public health requirements, however, are concerned both with the chemical content of the water and with the pathogenic organisms present. Although by satisfying the fishery requirements the chemical aspects are to a large degree safeguarded, the pathogenic content of the water is not usually considered important. Conversely a chlorinated water, satisfactory from a public health aspect, may be quite unsuitable for fisheries. In this country these two needs are satisfied by preserving the streams in as near natural condition as possible and chlorination is carried out after extraction for drinking purposes.

50 Cii ~40 Domesllc -Industrial ' __ • __ •••• -- ~30~-----------------------1 Bed 50 40 30 June 2004 Sept Oct 2005 March Fig:2. Comparison of Seasonal Temperature Fluctuations in a Bacteria Bed Treating Domestic Sewage with One Treating Industrial Sewage Together with Corresponding Air and Waste Temperatures 40 Ecological Principles of Wastewater Treatment Although sludges can be developed to operate at different temperatures, their efficiency is reduced if they are subjected to violent changes in temperature.

Thus both toxic and physical pollution can readily be detected by biological examination of the receiving stream. Apart from the above mentioned types of pollution the discharge of substances may alter the chemical nature of the water in other ways. Some readily oxidizable inorganic substances, such as sulphites in paper wastes, bring about simple de-oxygenation. Other wastes may alter the degree of hardness of the water or its salinity and thereby affect its natural qualities. Most effluents affect the receiving stream in more than one of the above mentioned ways.

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