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 <Sf Parry’s Improvements in Treating Sewage, Qct of the set of shafts b, b. The inclined bottom plates c are supported in the manner represented in Figure 1. The shafts communicate with each other by means of passages d, and the inclined channels c at the bottoms of the shafts communicate with each other by the passages e. In the end shaft IP the outfall or discharging arrangement is placed; the said discharging 5 arrangement consists of a vertical pipe / in the centre of the shaft for conveying away the clear liquid from the shafts, the top of the said vertical pipe being on a level with the bottom of the first or shallowest shaft. The vertical pipe / communicates by the pipe g and passage or channel h with the outfall. Above the pipe f is a float for temporarily raising or lowering 10 the level of the said pipe. The said float consists of a pipe i sliding within the pipe f and working water-tight therein. On the top of the pipe and surrounding its mouth is a plate k, which works upon the fixed vertical guide rods l. The said pipe or float i, k, is suspended by a chain m passing over a pulley and carrying a counterbalance weight. The pulley and weight are 15 not represented in the Drawing. The end shaft b2 is made considerably deeper than the others, and the sides of the said shaft at the bottom are inclined (see Figures 1 and 3). At the bottom of the said shaft b2 is a passage n, which communicates with an outer chamber into which the mud or subsidence from the shafts passes. This passage is opened and closed 20 by a sliding door or valve p, best seen in the separate view, Figure 3, in which the door or valve is represented raised and the passage n partly open. The sliding door or valve p may be lifted by a rod or chain. We arrange a set of the shafts represented in the Drawing side by side and work them in the following manner :—The sewage treated with the clay, clay 25 ore, or manganesic earth in the sewer, or as it enters the shafts, is turned into one set of the shafts, and the said shafts filled therewith, after which the second set is filled, and so on ; the said sewage is allowed to stand six to ten hours. As the shafts are filled with the sewage the float i, Jc, is raised, and the outflow pipe is thus supported above the level of the sewage in the said shafts. When 80 the sewage in the shafts has been left to rest sufficiently long to permit of the subsidence of the mud and suspended matters the weight is removed from the chain of the float balance when the top or plate k of the float sinks below the surface of the clear liquid which is drawn off from the top and passes by the pipes i,f, g, and channel h to the outfall, the discharge being continuous 35 until the float i, k, rests upon the top of the pipe/; the float i, k, is indicated partly raised in Figure 1 of the Drawing. By this arrangement the float follows the sinking level of the liquid, and the clear liquid is thus drawn off