Improvements in the Utilization of Precipitated Sewage Matters for the Manufacture of Cement.
Year: 1894

page_text: Date of Application, 26th June, 1894
Complete Specification Left, 19th Sept., 1894-Accepted, 20th Oct., 1894
PROVISIONAL SPECIFICATION.
Improvements in the Utilization of Precipitated Sewage Matters
for the Manufacture of Cement.
I, WILHELM BRUCH, of 11 Dotzheimerstrasse Wiesbaden in the Empire of
Germany, Builder, do hereby declare the nature of this invention to be as
follows:
In purifying the sewage waters of a town which always contain phosphates
especially when fæces are contained therein and in purifying and defecating the
contents of cess-pools, the phosphoric acid may be precipitated in the mud as
saturated phosphoric lime by employing sufficient caustic lime. This chemical
process is known and it is also known that the organic and inorganic substances
suspended in sewage waters or in the contents of cess-pools may be precipitated
together with the excess of carbonic lime and caustic lime introduced by the
abovementioned purifying process. When this precipitate is dried and then heated
to a glow, among other things a basic salt of lime with hydraulic qualities is formed
from the phosphoric lime, the carbonic lime, the caustic lime and the organic
substances.
In the process of incandescence, the organic substances are burnt up and the
existing calcium carbonate is changed to caustic lime which combines with the
precipitated phosphate of lime and with the phosphoric constituents of the organic
substances to form a basic orthophosphate of lime. These basic salts of lime have
hydraulic qualities and may be employed for preparing hydraulic cement for use in
the construction of subaqueous works.
Dated this 25th day of June 1894.
WM. P. THOMPSON & Co.,
Of 6, Lord Street, Liverpool, Agents for the Applicant.
COMPLETE SPECIFICATION.
Improvements in the Utilization of Precipitated Sewage Matters
for the Manufacture of Cement.
I, WILHELM BRUCH of 11, Dotzheimerstrasse, Wiesbaden in the Empire of
Germany, Builder do hereby declare the nature of this invention and in what
manner the same is to be performed, to be purticularly described and ascertained
in and by the following statement :-
In purifying the sewage waters of a town, which always contain phosphates
especially when fæces are contained therein and in purifying and defecating the
contents of cess-pools, the phosphoric acid may be precipitated in the mud as
saturated phosphoric lime by employing sufficient caustic lime. This chemical process
is known, and it is also known that the organic and inorganic substances suspended
in sewage waters or in the contents of cess-pools may be precipitated together with
the excess of carbonic lime and caustic lime introduced by the abovementioned
purifying process. When this precipitate is dried and then heated to a glow,
among other things a basic salt of lime with hydraulic qualities is formed from the
phosphoric lime, the carbonic lime, the caustic lime and the organic substances.
In the process of incandescence, the organic substances are burnt up and the
existing calcium carbonate is changed to caustic lime which combines with the
37

page_text: precipitated phosphate of lime and with the phosphoric constituents of the organic
substances to form a basic orthophosphate of lime. These basic salts of lime have
hydraulic qualities and may he employed for preparing hydraulic cement for use in
the construction of subaqueous works.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed, declare that what I
claim is :-
Improvements in the utilization of precipitated sewage matters for the manu-
facture of cement suitable for use in the construction of sub-nqueous works, such
improvements consisting in calcining the mud containing phosphate of lime
(produced by the precipitation of sewage waters by means of caustic lime) by
which calcination the organic substances contained therein are burnt up, and the
calcium carbonate is changed to orthophosphate of lime; substantially as herein-
before described and with the object set forth.
Dated this 18th day of September 1894.
WM. P. THOMPSON & Co.,
Of 6, Lord Street, Liverpool, Agents for the Applicant.
WM. P. THOMPSON & Co.,
Of 6, Lord Street, Liverpool, Agents for the Applicant.