IMPROVEMENTS IN THE PROCESS OF PRECIPITATING THE SOLID CONSTITUENTS OF SEWAGE SO AS TO SECURE THEIR FERTILISING PROPERTIES
Year: 1880

page_text: LETTERS PATENT to John Imray, of No. 28, Southampton Buildings, Chancery
Lane, in the County of Middlesex, for an Invention of "IMPROVEMENTS IN
THE PROCESS OF PRECIPITATING THE SOLID CONSTITUENTS OF SEWAGE SO
AS TO SECURE THEIR FERTILISING PROPERTIES.” A communication from
abroad by La Société Anonyme des Produits Chimiques du Sud-Ouest, an
Incorporated Company, of Paris, in the French Republic.
PROVISIONAL SPECIFICATION left by the said John Imray at the Office of
the Commissioners of Patents on the 16th July 1880.
JOHN IMRAY, of No. 28, Southampton Buildings, Chancery Lane, in the County
of Middlesex. "IMPROVEMENTS IN THE PROCESS OF PRECIPITATING THE SOLID
CONSTITUENTS OF SEWAGE SO AS TO SECURE THEIR FERTILISING PROPERTIES."
[A communication from abroad by La Société Anonyme des Produits Chimiques
du Sud-Ouest, an Incorporated Company, of Paris, in the French Republic.]
The solid constituents of sewage can be readily precipitated by known means,
but it is difficult to obtain a precipitate in such form as to admit of rapid and easy
filtration. It is moreover of importance to employ in the treatment of sewage
only such re-agents as are cheap, and give energetic action when applied in small
quantity.
According to this Invention the mass treated is desulphurated, its fatty
ingredients are saponified, and the solid ingredients are separated in the following
manner-The desulphuration is effected by adding from two to three thousandth
parts of a metallic sulphate, preferably sulphate of zinc, and the saponification of
the fatty ingredients accompanied by rapid precipitation of the solids is effected by
the addition of from five to twenty thousandth parts of slaked lime in the con-
dition of milk of lime. This process presents the advantage of requiring only
cheap reagents, but these are somewhat too energetic in their action on the organic
ingredients. For producing a manure of better quality the desulphuration and
the action on the fatty and viscid matters are simultaneously effected by the
addition of a cheap metallic chloride, preferably chloride of zinc, which is readily
obtained by dissolving zinc scrap in hydrochloric acid. Otherwise sulphate of
zinc may be first added, and then a solution of a salt of aluminium, preferably the
crude sulphate, is added in the proportion of about five thousandths after complete
desulphuration.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said John Imray in the Great Seal Patent Office on the 25th October
1880.
JOHN IMRAY, of No. 28, Southampton Buildings, Chancery Lane, in the County
of Middlesex. "IMPROVEMENTS IN THE PROCESS OF PRECIPITATING THE SOLID
CONSTITUENTS OF SEWAGE SO AS TO SECURE THEIR FERTILISING PROPERTIES."
A communication from abroad by La Société Anonyme des Produits Chimiques du
Sud-Ouest, an Incorporated Company, of Paris, in the French Republic.
The solid constituents of sewage can be readily precipitated by known means,
but it is difficult to obtain a precipitate in such form as to admit of rapid and
easy filtration. It is moreover of importance to employ in tho-treatment-of-
sewage only such re-agents as are cheap, and give energetic action when applied
in small quantity.
According to this Invention the mass treated is desulphurated, its fatty
ingredients are saponified, and the solid ingredients are separated in the following
manner: The desulphuration is effected by adding from two to three 'thousandth
parts of a metallic sulphate, preferably sulphate of zinc, and the saponification of
the fatty ingredients accompanied by rapid precipitation of the solids is effected
by the addition of from five to twenty thousanth parts of slaked lime in the
condition of milk of lime. This process presents the advantage of requiring only
cheap re-agents, but these are somewhat too energetic in their action on the organic
ingredients. For producing a manure-of- better quality the desulphuration and
the action on the fatty and viscid matters are simultaneously effected by the-
addition of a cheap metallic chloride, preferably chloride of zinc, which is readily
obtained by dissolving zinc scrap in hydrochloric acid. Otherwise sulphate of zinc
may be first added, and then a solution of a salt of aluminium, preferably the crude
sulphate, is added in the proportion of about five thousandths after complete
desulphuration.
Having thus described the nature of the said Invention, and in what manner the
same is to be perforined, as communicated to me by my foreign correspondents,
I claim,―
First. Precipitating the solid constituents of sewage by desulphuration effected
by addition of a metallic sulphate, and saponification by addition of slaked lime,
as herein described.
Second. Precipitating the solid constituents of sewage by addition of a metallic
chloride, as herein described.
Third. Precipitating the solid constituents of sewage by addition of sulphate of
zinc and of a salt of aluminium, as herein described.
In witness whereof, I, the said John Imray, have hereunto set my hand
and seal, this Eighteenth day of October, in the year of our Lord Ono
thousand eight hundred and eighty.
JOHN TUDAY