Specification of Henry Young Darracott Scott : treating sewage.

  • Scott, H. Y. D.
Date:
1872
Catalogue details

Licence: Public Domain Mark

Credit: Specification of Henry Young Darracott Scott : treating sewage. Source: Wellcome Collection.

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    Scott's Improvements in the Treatment of Seivage. In order to effect the precipitation of the chemical matters contained in the sewage, I add from sixteen to thirty-two grains of quicklime (more or less) to every gallon of sewage water in any of the modes usually practised. The amount of lime to be used will depend upon the richness of the sewage in those matters, which will form with lime o insoluble compounds such as carbonate or phosphate of lime. The precipitated solid matters when obtained are collected and dried on hot plates or slip kilns, as is practised in the manufacture of Port¬ land cement, or they may be dried in any other convenient way. If preferred, the solid matters may be partially dried and made into the 10 form of perforated bricks, in which condition they can be kept for an indefinite period without giving off any disagreeable odour, and the completion of the drying can then be allowed to take place slowly. I then expel from the solid matter the carbonic acid gas (which is preci¬ pitated in combination with the lime) by calcining the solid matter in 15 15 heaps or in a kiln or oven, which together with a drying floor may conveniently be constructed in the manner shewn in the accompanying Drawing. Pig. 1 is a longitudinal vertical section of the kiln; Pig. 2 is a hori¬ zontal section or sectional plan view of the same; Pig. 3 is a transverse 20 vertical section taken in the line 1, 2, of Pig. 1; and Pig. 4 is a similar view taken in the line 3, 4, of Pig. 1. a, a, is the compartment in which the cakes, bricks, or lumps of the dried precipitate are placed for the purpose of being calcined. It is provided with a doorway or opening a1, which when the kiln is charged 25 is bricked up. 5, 5, is the fire-place which is used to commence the firing, and which is fed through the opening h1 above or through the mouth h2. The fire-place h is separated from the calcining compartment by a perforated wall c constructed in fire-brick, or it may be built up with the material to be calcined. The calcining chamber a is con- 30 structed, as shewn in Pig. 3, in the form of a pointed arch, and is provided with an arch ax for the purpose of causing the heat to descend and act on the substances to be calcined. Openings d, d9 d, are also made in the sides or upper part of the chamber for the escape of steam or to admit air to support combustion, for which latter purpose the 35 inlets g> g, g9 in the end wall and floor of the chamber also serve. The heated gases and flame from the fire-place b will pass through the