Specification of Alfred Henry Hart and William Parry : treating sewage.

  • Hart, Alfred Henry.
Date:
1867
Catalogue details

Licence: Public Domain Mark

Credit: Specification of Alfred Henry Hart and William Parry : treating sewage. Source: Wellcome Collection.

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    Hart $ Parry's Improvements in Treating Sewage, $c. vertical pipe. A second inner pipe slides within the former, and is made water-tight by packing. On the top of the inner pipe and surrounding its mouth is an iron plate supported by a wooden frame to give it buoyancy. This plate is suspended by chains passing over pulleys, by means of which 5 chains the said plate can be raised above or sunk below the level of the liquid in the shaft; balance weights may be used to support the plate in the required position. When the liquid in the shaft has been allowed to rest sufficiently long to permit of the subsidence of the suspended matter the plate is lowered below the surface, when the clear liquid is drawn off from 10 the top and passes away down the pipe. The plate can be lowered as required to suit the sinking level of the liquid, and the clear liquid is thus drawn off without disturbing the sediment at the bottom of the shafts. The clay, clay iron ore, or manganesic earth may be mixed with the sewage as it passes into the shafts, but it is preferred to discharge the said clay, clay ore, 15 or manganesic earth into the sewer in the town, so as thereby to effect a more perfect mixing of the said clay, ore, or earth with the sewage. The float arrangement described may also be applied to tanks now in use for treating sewage. Figure 1 represents in vertical longitudinal section a set of subsiding shafts 20 and apparatus connected therewith constructed according to our Invention, and Figure 2 is a horizontal section of the same ; Figure 3 is a portion of the same separately. The same letters of reference indicate the same parts in each Figure of the Drawing. At a short distance from the outfall of the sewer, and by preference under 25 the original sewer a, we construct a series of vertical shafts marked 6, b, 52, the said shafts gradually increasing in depth as represented. We prefer to make the first shaft 15 feet deep, the second shaft 17 feet deep, and so on, each shaft increasing 2 feet in depth (excepting the end one marked b2) from the first shaft. The said shafts may, however, be made of other depths, 30 the exact depth being determined by the depth of the outfall into the stream, partly above which the shafts are constructed. In laying down new works or extending or enlarging the present system of tanks, a saving will be effected by constructing the shafts on the same ground as that occupied by the sewer. Each of the shafts is made of a series of annular castings fitting- 35 one upon another, the said castings being provided with flanges by which they may if necessary be bolted together. The bottom ring or casting of each shaft b is provided with a concave inclined plate c3 by means of which plates an inclined and continuous channel is made at the bottom of the whole