Improvements in the Treatment of Sewage Sludge.
Year: 1891

page_text: Date of Application, 27th Nov., 1891
Complete Specification Left, 27th Aug., 1892-Accepted 22nd Oct.
1892
PROVISIONAL SPECIFICATION.
Improvements in the Treatment of Sewage Sludge.
I, JOSEPH PRICE, of 58 Lombard Street, in the City of London, Accountant,
do hereby declare the nature of this invention to be as follows :-
:-
My invention relates to the treatment of sewage sludge, after it has been
deodorised and precipitated by any ordinary or special means, or by any process of
my own (whether patented or not) either at the sewage outfall or any other place
where it may be convenient to treat it; and has for its object the pressing and
drying of the sludge, with the admixture of certain chemicals, minerals, or
earths, so as to convert the sludge into a valuable manure both portable and
economical.
I take the sludge, after the effluent water has been drawn off, and mix with it,
in order to make it of a more convenient consistency for pressing and drying, as
well as to preserve and improve its fertilising properties, certain quantities of
"salt cake" (sulphate of soda or potash), a comparatively waste product in the
manufacture of nitrous, nitric, or muriatic acids; gypsum" (sulphate of lime);
"kaolin" (silicate of alumina) and "apatite" (phosphate of lime). Any one of
the above may be used alone, or two or more may be combined, the quantities used
being regulated in accordance with the constituents, condition, and consistency of
the sludge.
Dated this 27th day of November 1201
AMBROSE MYALL,
21, Cockspur Street, London, S. W., Agent for the Applicant.
COMPLETE SPECIFICATION.
Improvements in the Treatment of Sewage Sludge.
I, JOSEPH PRICE, of 58 Lombard Street, in the City of London, Accountant,
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 sewage sludge after it has been
deodorised and precipitated by any ordinary or special means, or by any process of
my own (whether patented or not) either at the sewage outfall or any other place
where it may be convenient to treat it, provided that the agent, or agents employed
for deodorisation and precipitation, are not such as to wholly destroy the fertilising
properties of the sludge; and the said invention has for its object the admixture of
certain chemicals, minerals, or earths with the sludge, whereby the pressing and
drying of the sludge is easily and rapidly accomplished, while at the same time it is
converted into a valuable, portable and economical manure.
In carrying out my invention, I take the sludge, after the effluent water has been
drawn off, and mix with it certain quantities of "salt cake" (sulphate of soda or
potash) a comparatively waste product in the manufacture of nitrous, nitric or
muriatic acids, "gypsum (sulphate of lime), "kaolin" (silicate of alumina);
"2
or "apatite" (phosphate of lime).
Any one of the above substances may be used alone, or any two or more may be
combined, and as the constituents, condition and consistency of the sludge will
vary in different places where it may be collected for treatment, and by reason of
various agents employed for deodorising and precipitating, the quantities of the
LD017

page_text: above materials, used in the process of pressing and improving the fertilising
properties of the sludge, will necessarily vary considerably; experience shewing that
the amount of the said materials used alone or in combination, will range from
about 20 to 50 per cent. of the weight of the sludge treated; but I prefer, under
ordinary circumstances, to employ about 25 per cent. of phosphate of lime and about
8 per cent. of each of the other materials.
The effect of the admixture is to remove the sliminess from the sludge and render
it of such consistency, that it can be readily pressed and dried, as well as to preserve
and improve its fertilising properties.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed, I declare that what I
claim, is :-
"
1. The combination with precipitated and deodorised sewage sludge, of "salt
cake," or gypsum," or "kaolin," or apatite," or any two or more of these
substances for the purpose of enabling the said sludge to be readily pressed and
dried and to preserve and improve its fertilising properties, substantially as herein
set forth.
2. The process for preparing a fertilising compound, consisting of the admixture
with precipitated and deodorised sewage sludge, of "salt cake," or "gypsum," or
"kaolin," or "apatite," or any two or more of these substances, and the pressing
and drying of the mixture so obtained, by any suitable means, substantially as herein
set forth.
3. As new articles of manufacture, the fertilising compounds prepared in the
manner, substantially as hercin set forth.
Dated this 27th day of August 1892.
AMBROSE MYALL,
21, Cockspur Street, London, S.W., Agent for the Applicant.