Specification of Henry Malcolm Ramsay : treating sewage.

  • Ramsay, Henry Malcolm.
Date:
1874
Catalogue details

Licence: Public Domain Mark

Credit: Specification of Henry Malcolm Ramsay : treating sewage. Source: Wellcome Collection.

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    2 A.D. 1873.—N° 4092. Provisional Specification. Ramsay’s Improvements in Treating Sewage. These drains to be laid in in parallel lines at equal distances apart or thereabouts as the contour levels of land in any locality may render most expedient for the intended purposes generally. I should prefer a distance of twelve feet from centre to centre, all at such levels or gradients as will effect by head pressure a rapid flow through drains 5 and percolation into the filter materials in which the drains are enclosed. The land used for purposes of distribution, filtration, and disposal of the sewage under or by the within specified half pipe filter system in any locality, is to be laid out in equal areas or thereabouts generally. I should prefer in one acre plots of 5 chains by 2 chains, the whole to be 10 prepared for the reception of the parallel and longitudinal lines of the half pipe filter drains, by trenches being excavated therein of such widths and depths, as the nature of the subsoil may render most ex¬ pedient and successful for rapid filtration or absorption results generally. I should prefer trenches three feet wide by fifteen inches in depth, in 15 addition to the depth under the surface previously described; these trenches to be filled in with ballast, rubble, gravel stones, burnt clay, hard core, or other like coarse filtering material, as found in each locality up to the necessary levels for the reception of and bedding the half pipes thereon. Upon the lines of half pipes being so laid, the trenches are to be 20 further filled in with similar material round and over the half pipe filter drains up to a level covering in crowns of same, and the whole filled in and finished to surface levels with the excavated material, openings being left in trenches here and there for inspection, and continual aeration of the filtering medium secured by the within specified system, 25 a system combining intermittent downward filtration. The whole of each set or one acre plot of drains to be charged or filled with clear sewage from time to time from a delivery conduit or conduits as the case may be, the same being supplied with clear sewage from outfall reservoirs, storage tanks, or other depots, the raw sewage being 30 passed through charcoal screen filters before being passed into said delivering conduit or conduits, so that all sedimental or organic matter may be removed therefrom, the delivering conduit or conduits being laid down or constructed at such levels as will secure the necessary head pressure for supply of half pipe filter drains in each plot. 35 The pipes to be applied and used for these purposes I design and con¬ struct in stone or redware or iron, as a half pipe with flange each side or