Process for Treating the Effluent from Electrolytically or Chemically Purified Sewage for Neutralizing its Alkalinity, and for the Production of Bye-products therefrom.
Year: 1893

page_text: Date of Application, 25th Jan., 1893.
Complete Specification Left, 9th Nov., 1893-Accepted, 9th Dec., 1893
PROVISIONAL SPECIFICATION.
Process for Treating the Effluent from Electrolytically or Chemically
Purified Sewage for Neutralizing its Alkalinity, and for the
Production of Bye-products therefrom.
I, WILLIAM WEBSTER, of Glencot, Blackheath Park, Blackheath, in the
County of Kent, Electrician and Chemist, do hereby declare the nature of this
invention to be as follows:-
My invention relates to the treatment of the effluent resulting from sewage which
has either been treated electrolytically by means of iron plates, as described in the
Specification to my Patent No. 1333 of 1887, or chemically, with a solution of iron
salts or salts of alumina. The said effluent is of an alkaline nature and carries
matters in suspension, both of which it is desirable to remove before allowing the
effluent to flow into a river or other waterway. According to my present invention
I accomplish both objects without having recourse to filtration, and I at the same
time produce a valuable bye-product, by the following means."
I first mix with the effluent a solution or semi-solution of either Portland cement,
fluxed lower-grey-chalk, commonly known as "soap," or caustic lime, which in
being allowed to subside carries down the solid suspended matter therein.
The effluent is then brought into intimate contact with the gaseous products of
combustion resulting from the burning of Portland cement, fluxed lower-grade-
chalk, or lime, such gaseous products containing sulphurous acid, carbonic acid,
and carbonic oxide, which, in acting upon the effluent effectually neutralize its
alkalinity, and precipitate any lime remaining in solution.
For this purpose the effluent may be made to flow over a series of weirs, or
shallow trays, within a closed chamber through which the said gases are made
to travel in the contrary direction, or the effluent may be made to fall in a shower
from the top of a tower through which the said gases are made to rise.
The solid precipitates obtained from the effluent as above described can be
remanufactured into cement by burning, and can then either be used for building
purposes or for treating fresh quantities of effluent from sewage.
Dated this 25th day of January 1893.
ABEL & IMRAY,
Agents for the Applicant.
COMPLETE SPECIFICATION.
Process for Treating the Effluent from Electrolytically or Chemically
Purified Sewage for Neutralizing its Alkalinity, and for the
Production of Bye-products therefrom.
1, WILLIAM WEBSTER, of Glencot, Blackheath Park, Blackheath, in the
County of Kent, Electrician and Chemist, 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 relates to the treatment of the effluent resulting from sewage
which, by treatment by any known process, produces an effluent of an alkaline
nature and carries matters in suspension, both of which conditions it is desirable
to remove before allowing the effluent to flow into a river or other waterway.
According to my present invention I accomplish both objects without having
recourse to filtration, and I at the same time produce a valuable bye-product, by
the following means.

page_text: I first mix with the effluent a solution or semi-solution of either Portland cement,
fluxed lower-grey-chalk (commonly known as soap) or caustic lime, which in being
allowed to subside, carries down the solid suspended matter therein. A suitable
proportion for such admixture would be 8 grains per gallon of weak sewage, but
some descriptions of sewage may require as much as 100 grains per gallon.
The effluent is then brought into intimate contact with the gaseous products of
combustion resulting from the burning of Portland cement, fluxed lower-grey-
chalk, or lime, such gaseous products containing sulphurous acid, carbonic acid,
and carbonic oxide, which, in acting upon the effluent, effectually neutralize its
alkalinity, and precipitate any lime remaining in solution.
For this purpose the effluent may be made to flow over a series of weirs, or
shallow trays, within a closed chamber through which the said gases are made to
travel in the contrary direction, or the effluent may be made to fall in a shower
from the top of a tower through which the said gases are made to rise.
The solid precipitates obtained from the effluent as above described can be
remanufactured into cement by burning, and can then either be used for building
purposes or for treating fresh quantities of effluent from sewage.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed, I declare that what I
claim is :-
1. A process for neutralizing the alkalinity of the effluent from sewage that
has been purified by any known process and for obtaining bye products therefrom,
wherein such effluent is first mixed with either Portland cement, fluxed lower-grey-
chalk, or caustic lime, and, after subsidence thereof, is then brought into contact
with the gaseous products of combustion resulting from the burning of Portland
cement, fluxed lower-grey-chalk, or lime, whereby the alkalinity of the effluent is
neutralised, and any lime remaining in suspension is precipitated, substantially as
described.
2. In the process referred to in the first claim, the utilisation of the precipitates
obtained from the admixture of the substances mentioned, by burning the same so
as to convert them into cement, substantially as described.
Dated this 9th day of November 1893.
ABEL & IMRAY,
Agents for the Applicant.