Specification of Henry Young Darracott Scott : treatment of sewage.

  • Scott, H. Y. D.
Date:
1874
Catalogue details

Licence: Public Domain Mark

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

    6/18 (page 4)
    Specification. Scott’s Improvements in the Treatment of Sewage. subjected to calcination to form a cement without further treatment as a precipitant. In applying my process to solid foeces or night soil I separate the liquids as far as convenient and then add lime and an acid solution of a phosphate of iron, lime, or alumina to produce deodorization, and I find 5 that I can effect this when the lime is added in the proportion of about TV of the weight of the wet night soil. I leave the compound very slightly acid, and then remove the excess of water by spontaneous evaporation, or by heat. I may use charcoal in conjunction with the above deodorants either 10 after the foecal matters have been conveyed to the manure manufactory, or in the habitations of the people; but as my object is to produce con¬ centrated manures (for these alone command a market) I keep the quantity of charcoal used as low as possible, unless it be of that kind which is used by sugar refiners, and which has itself a high fertilizing 15 value. The compound obtained by this process may manifestly be subjected to distillation, and the char obtained be employed in the deodorization of fresh quantities of foecal matters. Tor the more perfect recovery of the nitrogen I may employ excess of lime, as in the case of the deposit (D). 20 Although it is desirable to add excess of lime to the deposit (D) when the object is the recovery of the whole of the nitrogen as a salt of - ammonia, I sometimes find it advisable to neutralize the excess of lime with phosphoric acid or soluble phosphate for the sake of preparing from the deposit a substitute for animal charcoal; but under such 25 treatment the yield of ammonia is smaller. I may also produce a substitute for animal charcoal by charing the precipitate (P). SPECIFICATION in pursuance of the conditions of the Letters Patent, filed by the said Henry Young Darracott Scott in the Great Seal Patent Office on the 14th June 1875. 80 TO ALL TO WHOM THESE PEESENTS SHALL COME, I, Henry Young Darracott Scott, of Ealing, in the County of Middlesex, Major General, C.B., send greeting.