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Chadwick's 1842 report influenced the design of sewers and the provision of water supplies and had the engineers of that period had been allowed to put as much energy and skill as they were then putting into railway construction, much illness and disease could have been prevented. Progress was slow because of political opposition. In the 1830s Chadwick appreciated the importance of cheap self-cleansing water-borne sewerage systems with constant water supplies, but his theories were strongly opposed by many engineers.
When ample oxygen is present or supplied to the liquid the reactions that take place are mainly due to the aerobic bacteria which depend on a sufficiency of air for their existence. These are the microorganisms which are responsible for the changes that take place in a contact bed, percolating filter or aeration tank. The process consists of breaking up the organic matter Population and urbanisation 17 and the liberation of carbon which combines with oxygen to form carbon dioxide, followed by the oxidation of the nitrogenous material with the formulation of nitrites and nitrates.
In view of all this the Corporation have determined to convert Manchester into a water-closet town, and the present drainage scheme has been sanctioned and the greater part of it already carried out. At present the whole of our domestic sewage, with the exception of that removed by the pail-closet system, finds it way by the street sewers into the various rivers and streams which flow through the city, and the scheme now being proceeded with is an intercepting scheme whereby the new main sewers are as far as practicable, carried along the valleys at such depths as to intercept the existing sewers, and convey all the sewage into one main outfall and forward to the sewage works now being constructed on the westerly side of and about five miles distant from the city The final stage of sewerage development in most large industrial towns came when urban development increased to the point that the original interceptor sewers became inadequate and further intercepting relief sewers were built, many of these not being completed until relatively recent times.