A New and Improved Compound for the Precipitation and Purifl- cation of Sewage and other Waste Water and Drinking Water.
Year: 1891

page_text: Date of Application, 17th Oct., 1891
Complete Specification Left. 18th July. 1892-Accented. 1st Oct. 1892
PROVISIONAL SPECIFICATION.
A New and Improved Compound for the Precipitation and Purifl-
cation of Sewage and other Waste Water and Drinking Water.
I, ERNEST GRIMSHAW of Clayton Manchester England, do hereby declare the
nature of this invention to be as follows:-
The addition either in a state of solution or suspension of hydrated oxide of iron
to the perchloride or persulphate of iron, whereby the said perchloride or per-
sulphate of iron is rendered much more efficacious for the precipitation & purification
of sewage, waste water, and drinking water.
The addition may be of the hydrated peroxide or hydrated suboxide of iron
preferably the former.
Dated this 15th day of October 1891.
ERNEST GRIMSHAW.
COMPLETE SPECIFICATION.
A New and Improved Compound for the Precipitation and Purifi-
cation of Sewage and other Waste Water and Drinking Water.
I, ERNEST GRIMSHAW of 41 North Road, Clayton, Manchester, Chemical
Manufacturer 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 :-
The addition either in a state of solution or suspension, of hydrated oxide of
iron to the perchloride or persulphate of iron whereby the said perchloride or
persulphate of iron is rendered much more efficacious for the precipitation and
purification of sewage, waste water and drinking water.
This addition may be, of the hydrated peroxide or the hydrated suboxide of iron,
preferably the former, and may be accomplished by agitating the solution of per-
chloride or persulphate of iron with any of the known forms of hydrated oxide of
iron, with or without the application of heat, or alternatively a sufficient quantity of
an alkali or an alkaline earth may be added to the perchloride or persulphate of iron
to neutralize a portion of the acid and so leave an excess of oxide of iron in solution
or suspension.
A suitable proportion of the hydrate of iron, preferably the ferric hydrate, to
use, is that of a weight of hydrate of iron equal to the weight of perchloride or
persulphate of iron contained in the solution. By this means an oxychloride or
basic perchloride or persulphate is formed.
When the compound is formed by the addition of an alkali or alkaline earth, the
same proportion is arrived at by adding such an amount of either or both of these
as will neutralize about half the acid of the perchloride or persulphate. This
proportion of hydrate of iron may be varied according to the acidity or alkalinity
of the sewage &c. which is to be treated. An excess of hydrate of iron over these
proportions is in some cases desirable especially in the case of a sewage or waste
water which has an acid reaction.
Having now particularly described and ascertained the nature of my said inven-
tion & in what manner the same is to be performed, I declare that what I
claim is :-
A new & improved compound for the precipitation and purification of sewage

page_text: & other waste waters, and drinking water, by the addition of hydrated peroxide or
suboxide of iron to perchloride of iron or persulphate of iron substantially as
herein before set forth.
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