Specification of William Strang : separating sewage.

  • Strang, William.
Date:
1869
Catalogue details

Licence: Public Domain Mark

Credit: Specification of William Strang : separating sewage. Source: Wellcome Collection.

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    Strang's Improvements in Separating Sewage. with bars at the same distances apart as those of the upper one, but they are placed opposite the spaces of the upper grating and so as when raised close up thereto to enter between the upper bars and reduce the effective passage through. On lowering the lower grating however the ashes have a much freer passage and fall through. The lower gating 6 is suspended 5 by rods 14 and the ends may be lowered or raised simultaneously or separately. Prongs are fixed in the bars of the lower grating for the purpose of breaking up the ashes above when they mass together. Pio-ure 3 is a vertical section of a second modification, which resembles the former excepting that it has a single fixed grating 5 for the ashes to 10 rest upon, whilst a door 15 is provided for the removal of the lowermost ashes when these are considered to be saturated; also that the valve 12 and outlet 9 for the solids is constructed in an external valve box 16 ; also that the filtered liquid overflows by a fine grating 7 all round the upper part of the vessel or box into a gutter 17 leading to the liquid 15 outlet pipe 8. A third modification is shown in vertical section and in end view in Pigures 4 and 5 on Sheet 2 of the Drawings. This differs from the first modification in having the space under the gratings 5, 6, divided into two compartments by a partition 18 and valve 19. In using this arrange- 20 ment the outer valve 12 is kept closed and the inner valve 19 open, so that the solids may collect in the lower compartment, and when it is considered full enough a portable receptacle is connected to the outlet 9, and the inner valve 19 is then closed and the outer one 12 opened for the purpose of transferring the solids to the portable receptacle. 25 If wished the water which comes away from the liquid outlet pipe 8 may be passed through a second or several separate and distinct masses of ashes or other suitable filtering materials, after which it will be quite fit for many uses ; but if the object is simply to prevent the pollution of street sewers and rivers the water from either modification of apparatus 30 may be at once run into the drain or sewer without being subjected to a second filtering. It is an obvious advantage of my improved arrangements that they completely avoid the difficulties met with in existing systems in pre¬ venting the entrance into dwelling-houses of foul gases and exhalations 35 from drains and sewers, for with them there can be no current or passage of air or gases up through the soil pipes in consequence of the apparatus interrupting and stopping the passage through.