Improvements in the Treatment of Sewage and other Foul Liquid or Semi-liquid Matters for the Clarification, Disinfection, and Deodorisation thereof.
Year: 1891

page_text: Date of Application, 23rd Dec., 1891
Complete Specification Left, 10th Sept., 1892-Accepted, 15th Oct., 1892
PROVISIONAL SPECIFICATION.
Improvements in the Treatment of Sewage and other Foul Liquid
or Semi-liquid Matters for the Clarification, Disinfection, and
Deodorisation thereof.
1 JOHN HANSON of Wakefield in the County of York Engineer do hereby
declare the nature of this invention to be as follows:-
My invention consists in the treatment of sewage or other foul liquid or semi-
liquid matters by the conjoint use of sulphate of alumina and alkali waste prepared
preferably according to the process described in my Specification of Letters Patent
No. 14997 of 1887 or sulphite of calcium so that sulphurous acid is produced by
the action of the sulphate of alumina upon the sulphite of calcium, the sulphate of
alumina being at the same time decomposed with the formation of a gelatinous
precipitate of hydrate of alumina.
The sulphurous acid deoderises and disinfects, and the hydrate of alumina
clarifies, the sewage or other foul matter under treatment.
In applying this process for the treatment of sewage, I may proceed as follows:-
1 mix the sulphate of alumina and prepared alkali waste or sulphite of calcium
immediately before use, either dry or with the addition of water (preferably the
latter), and add the mixture to the sewage which is then well agitated and after-
wards allowed to stand so that the solid matter precipitates and the clear liquid is
then separated from the sediment.
The quantity of the mixture required will vary with the character of the sewage
or other like matter to be treated but with average London sewage from 7 to
10 grains each of sulphate of alumina and prepared alkali waste or sulphite of
calcium per gallon of sewage is sufficient. The essence of the invention consists in
the use of a mixture of sulphate of alumina and the prepared alkali waste or
sulphite of calcium for the production within the sewage or other foul liquid
or semi-liquid of sulphurous acid and hydrate of alumina for its clarification
disinfection and deoderisation and the production of an effluent which is non-
alkaline.
Dated this 23rd day of December 1891.
J. H. JOHNSON & Co.,
47, Lincoln's Inn Fields, London, W.C., Agents.
COMPLETE SPECIFICATION.
Improvements in the Treatment of Sewage and other Foul Liquid
or Semi-liquid Matters for the Clarification, Disinfection, and
Deodorisation thereof.
I, JOHN HANSON of Wakefield in the County of York, Engineer do hereby
declare the nature of this invention, and in what manner the same is to be
performed, to be particularly described and ascertained in and by the following
statement :-
My invention consists in the treatment of sewage, or other foul liquid, or semi-
liquid matters, by the conjoint use of sulphate of alumina and alkali waste,
prepared, preferably, according to the process described in my Specification of
Letters Patent No. 14997 of 1887, or sulphite of calcium, so that sulphurous acid
is produced by the action of the sulphate of alumina upon the sulphite of calcium,
the sulphate of alumina being, at the same time, decomposed with the formation
of a gelatinous precipitate of hydrate of alumina.

page_text: The sulphurous acid deodorises and disinfects, and the hydrate of alumina
clarifies, the sewage, or other foul matter, under treatment.
In applying this process for the treatment of sewage I may proceed as follows:
I mix the sulphate of alumina, and prepared alkali waste, or sulphite of calcium,
immediately before use, either dry, or with the addition of water, (preferably the
latter), and add the mixture to the sewage which is then well agitated, and after-
wards allowed to stand, so that the solid matter precipitates, and the clear liquid
is then separated from the sediment.
The quantity of the mixture required will vary with the character of the sewage,
or other like matter, to be treated; but with average London sewage from 7 to
10 grains each of sulphate of alumina and prepared alkali waste, or sulphite of
calcium, per gallon of sewage is sufficient.
The essence of the invention consists in the use of a mixture of sulphate of
alumina and the prepared alkali waste, or sulphite of calcium, for the production
within the sewage, or other foul liquid, or semi-liquid, of sulphurous acid and
hydrate of alumina for its clarification, disinfection, and deodorisation, and the
production of an effluent which is non-alkaline.
Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed I declare that what I
claim is―
The treatment of sewage, or other foul liquid, or semi-liquid, matters by the
conjoint use of sulphate of alumina and a preparation of alkali waste, or sulphite
of calcium, substantially as, and for the purposes, hereinbefore described.
Dated this 10th day of September 1892.
J. H. JOHNSON & Co.,
47, Lincoln's Inn Fields, Agents.