AN IMPROVEMENT IN THE PURIFICATION OF SEWAGE BY PRECIPITATION
Year: 1884

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We JOHN WILLIAM SLATER of N° 36 Wray Crescent Holloway in the County
of Middlesex Analytical and Consulting Chemist and WILLIAM STEVENS of
N° 29 New Bridge Street in the City of London Secretary to the Native
Guano Company (Limited) do hereby declare the nature of the said Invention.for
"AN IMPROVEMENT IN THE PURIFICATION OF SEWAGE BY PRECIPITATION " to be as
follows:-
Our invention relates to the process of purifying sewage described in the
provisional specification accompanying our application for Letters Patent made
the first day of December 1884. No 15810 and our improvement in the said process.
consists in the use of blood in conjunction with the matters described in the said
specification which matters are clay and carbon and muriate of alumina the
muriate of alumina being prepared by treating Gibbsite or other naturally occurring
terhydrate of alumina with muriatic acid.
In cases where the clay and carbon are to be added to the sewage separately
from the muriate of alumina we prefer to add the blood to the mixture of clay and
carbon. In cases where the clay and carbon are mixed with the muriate of
alumina before being added to the sewage we add the blood to the said mixture.
The proportion of blood which we use is generally about one quarter of a pound
by weight to ten thousand gallons of sewage but we do not limit ourselves to the
use of any definite proportion of blood the proportion required being mainly
dependent on the nature and quality of the sewage.
The blood should be fresh or not coagulated and mixed with about its own
weight of dry earth or clay as it is drawn from the animal slaughtered.
D
1
W. T. WHITEMAN,
Agent for the Applicants.

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An Improvement in the Purification of Sewage by Precipitation.
We JOHN WILLIAM SLATER of N° 36 Wray Crescent Holloway in the County
of Middlesex Analytical and Consulting Chemist, and WILLIAM STEVENS of
N° 29 New Bridge Street in the City of London Secretary to the Native Guano
Company (Limited) do hereby declare the nature of our said Invention for "AN
IMPROVEMENT IN THE PURIFICATION OF SEWAGE BY PRECIPITATION "and in what
nianner the same is to be performed to be particularly described and ascertained in
and by the following statement:-.
Our invention relates to the process of purifying sewage described in the
provisional and complete specifications accompanying our application for Letters
Patent made the first day of December 1884 N° 15810 and our improvement in
the said process consists in the use of blood in conjunction with the matters
described in the said specifications which matters are clay and carbon and muriate
of alumina the muriate of alumina being prepared by treating Gibbsite or other
naturally occurring terhydrate of alumina with inuriatic acid.
In cases where the clay and carbon are to be added to the sewage separately
from the muriate of alumina we prefer to add the blood to the mixture of clay and
carbon. In cases where the clay and carbon are mixed with the muriate of
alumina before being added to the sewage we add the blood to the said mixture.
The proportion of blood which we use is generally about one quarter of a pound
by weight to ten thousand gallons of sewage but we do not limit ourselves to the
use of any definite proportion of blood.
The blood should be fresh or not coagulated. It may be preserved in a state fit
for use by being mixed with about its own weight of dry earth or clay as it is
drawn from the animal slaughtered.
Having now particularly described and ascertained the nature of our said
Invention and in what manner the same is to be performed we declare that what
we claim is
The use in the treatment of sewage of blood in conjunction or admixture with
muriate of alumina prepared as described in the specifications accompanying our
application for Letters Patent N° 15810 dated the first day of December 1884 or
in conjunction or admixture with such muriate of alumina and the other agents
described in the aforesaid specifications namely clay and carbon or charcoal or
lignite.