Specification of Henry Young Darracott Scott : treating sewage water.

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

Licence: Public Domain Mark

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

    7/10 (page 5)
    Specification. A.D. 1873.—N° 3742. _ Scott's Improvements in Treating Sewage Water. and the cost of the hydrochloric acid, which in some parts of the country may to a great extent he considered a waste product. I sometimes use the spent charcoal of sugar refineries for the second part of the process, vizfc., that which is performed in tank No. 2. In this case I employ enough acid to bring all the phosphoric acid or a con¬ siderable proportion of it into the soluble condition. The precipitate thus produced consists chiefly of phosphate of lime and charcoal. Mineral phosphates dissolved in acid may he used in conjunction with the animal charcoal, and the deposit, when the cleansing powers of the 10 charcoal are wholly exhausted, may be disposed of as manure, together with the precipitated phosphates with which it has thus become mixed. Although I prefer the above order of procedure it is not essential to the chief object of this Invention (vizb, the decolorization of sewage) that tank No. 2 shall be employed. Tor instance, prussiate of potash charcoal 15 being but of trifling value the charcoal prepared therefrom may be added with the lime or before or immediately after it in tank No. 1. When however the precipitant has the value which spent animal charcoal from the sugar refineries adds to the precipitate this course is inexpedient, as the worthless suspended matters in the raw sewage degrade the quality 20 of the resulting manure. Having now described my Invention of “ Improvements in the Purifi¬ cation of Sewage Water,” and having explained the manner of carrying the same into effect, I wish it to be understood that under the above in part recited Letters Patent I claim, purifying sewage water by producing 25 a precipitate therefrom, and removing the coloring matters contained therein by means of compounds of iron and alumina or lime with carbon, such compounds being derived from the treatment of prussiate of potash or other refuse animal charcoal with hydrochloric or sulphuric acid, as herein set forth. 30 In witness whereof, I, the said Henry Young Darracott Scott, have hereunto set my hand and seal, the Sixteenth day of May, in the year of our Lord One thousand eight hundred and seventy-four. HENRY Y. D. SCOTT, (l.s.) LONDON: Printed by lIeorge Edward Eyre and William Spottiswoode, Printers to the Queen's most Excellent Majesty, 1874*,