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Sewerage - LoveToKnow 1911 (10063 words) |
 | The matter to be dealt:with may conveniently be classified as made up of three parts: (I) excreta, consisting of urine and faeces; (2) slop-water, or the discharge from sinks, basins, baths, andc., and the waste water of industrial processes; (3) surface water due to rainfall. |
| It may be removed in an unmixed state, either in pails or tanks or (with the aid of pneumatic pressure) by pipes; or it may be defaecated by mixture with dry earth or ashes; or, finally, it may be conveyed away in sewers by gravitation, after the addition of a relatively large volume of water. |
| In the sewerage of Berlin, for example, the maximum rainfall allowed for is $ of an inch per hour, of which one-third is supposed to enter the sewers. |
| Use of dewatered digested sewerage sludge as the bloating agent - Patent 4943233 (620 words) |
| A process for manufacturing expanded shale aggregate using dewatered digested sewerage sludge as the bloating agent for the shale and using high-lime blast furnace slag as the fluxing agent to lower the melting temperature of the mix and also using refuse derived fuel as the main fuel in the kiln. |
| However, it is also possible to utilize the sewerage sludge as the bloating agent in the manufacture of expanded shale aggregates by mixing digested sewerage sludge with shale and burning the mix in a vertical kiln or rotary kiln at 2000.degree. |
| Expanded shale aggregates is usually produced by burning a mixture of ground shale or clay with at least 25% water in a vertical kiln or rotary kiln at 2000.degree. |
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