Specification of Adolphe Pierre Vassard : treating liquid sewage, &c.

  • Vassard, Adolphe Pierre.
Date:
1872
Catalogue details

Licence: Public Domain Mark

Credit: Specification of Adolphe Pierre Vassard : treating liquid sewage, &c. Source: Wellcome Collection.

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    Vctssard's Improvements in Treating Liquid Sewage, 8fC. which may he used as manure and for other purposes, such precipitates being, firstly, the salts contained in solution therein, and known as carbonate, sulphate, lactate, and phosphate of lime, as well as the carbonic, sulphuric, lactic, and phosphoric acids, either free or in combination with alkalies or alkaline earths; secondly, the ammonia 5 contained in liquid sewage and other ammoniacal liquors, either free or in combination with acids, which is deposited to such an extent as to leave the supernatant water pure enough to he allowed to run or flow into any stream of water. In treating sewage I prefer first to separate the liquid from the solid 10 portions thereof by what is known as the “ lime process,” hut the reason of such a separation being only a commercial one, my treatment of the liquid portion as herein-after described is applicable thereto without such separation. According to my Invention I treat the liquid portion of sewage or 15 other ammoniacal liquors by submitting it or them to the action of two chemical compounds which I introduce separately and consecutively. The first of such compounds is a mixture of oxide of barium and biphosphate of lime. The second of such compounds is a mixture of chloride of magnesium and aluminate of soda. I employ these com- 20 pounds by preference in about the following proportions, viz1. :—In the first compound twenty parts of oxide of barium to one hundred and twenty parts of biphosphate of lime. In the second compound one hundred parts of chloride of magnesium to fifty parts of aluminate of soda. I find that by using the two chemical agents which form the 25 first of the said compounds separately, that is to say, first the oxide of barium, and then the biphosphate of lime, I obtain a more certain result. The exact proportions of chemical agents to be used relatively to the quantity of sewage or other ammoniacal liquors to be treated depend on 30 the quantity of carbonates, sulphates, lactates, phosphates, or on the quantity of ammonia it or they may contain, and can only be ascertained by experiment, but they may be stated approximately to be about one part and seven-tenths of a part of the said chemical agents to one thousand parts of liquid sewage. I can replace in the first compound 35