Download e-book for iPad: Surface Water Pollution and its Control by K. V. Ellis

By K. V. Ellis

ISBN-10: 1349090719

ISBN-13: 9781349090716

ISBN-10: 1349090735

ISBN-13: 9781349090730

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These two processes are known as catabolism (dissimilation), the decomposition of food to provide energy for the cell, and anabolism (assimilation), the use of food for cell synthesis. Catabolic reactions are all exothermic, or energy yielding, and are often described as biological oxidation reactions, or respiration. Biological oxidation can involve either direct oxidation, as with some soil bacteria, which are able to oxidise directly inorganic compounds such as carbon monoxide, sulphur and hydrogen utilising molecular oxygen, or indirect oxidation, which involves the enzymic removal of hydrogen from the substrate molecule and its passage along a chain of reactions until it meets the final hydrogen acceptor.

The latter two effects can drastically increase the loadings to the secondary (biological) treatment processes while the former effect makes it more difficult for these biological units to cope adequately with the oxygen demand. Also, foam produced by detergents may hinder the operation of a wastewater treatment plant and by preventing access to some areas. This problem is now rare but was commonplace in the days of 'hard' detergents and added greatly to the difficulties and danger of wastewater treatment works operation.

It is only the biodegradable fraction that is of interest as it is only this portion that will create an oxygen demand in the river or the treatment works. The COD provides a value for the oxygen demand created through the oxidation of a very large percentage of the organic material present, both biodegradable and nonbiodegradable. As discussed above even the ultimate BOD is incapable of truly representing the whole of the biodegradable oxygen demand. How much the ultimate BOD represents is open to question and will certainly vary from sample to sample.

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Surface Water Pollution and its Control by K. V. Ellis

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