improvements in the treatment of suchs
Year: 1883

page_text: We WILLIAM CAMERON SILLAR of Blackheath in the County of Kent Gentleman
and JOHN WILLIAM SLATER of Tollington Park in the County of Middlesex
Analytical Chemist the grantees of Letters Patent bearing date the third day of
March 1883 N° 1144 seek leave to amend the title and the Specification of the
Invention for which the said Letters Patent were granted as shown in red ink in
the copy of the original Specification hereunto annexed that is to say to amend
the title by striking out therefrom the words "and improvements in the treatment
of such matters" and to amend the said Specification by striking out the words
"and improvements in the treatment of such matters" from lines 8 and 9 of page 3
of the Specification as printed by the Queen's printer and by striking out the word
"first" from line 10 of the said page 3 and by striking out the words "this part
of" from line 14 of the said page 3 and by striking out the whole of lines 39 to 50
both inclusive of the said page 3 and by striking out the whole of lines 1 to 16
both inclusive of page 4 of the said printed Specification and by striking out the
words "and improvements in the treatment of such matters" from lines 19 and 20
of the said page 4 and by striking out the word "First" from line 24 of the said
page 4 and by striking out the whole of lines 29 to 36 both inclusive of the said
page 4.
Our reason for making this amendment is as follows:-That since the grant of
the aforesaid Letters Patent and the filing of the aforesaid Specification we have
been advised that so much of the subject matter of the Invention as is referred to
in that part of the title which we seek leave to strike out and so much of the
Invention as is described and claimed in those parts of the Specification which we
seek leave to strike out may be objected to on the ground of want of novelty.

page_text: In the matter of Letters Patent granted to William Cameron Sillar and John
William Slater N° 1144 of the series of the year 1888.
.
I hereby grant leave to the said William Cameron Sillar and John William
Slater to amend the Specification, filed in pursuance of the said Letters Patent, in
the manner proposed.

page_text: LETTERS PATENT to William Cameron Sillar of Blackheath in the County of
Kent Gentleman and John William Slater of Tollington Park in the County
of Middlesex Analytical Chemist for an Invention of "IMPROVEMENTS IN
THE PREPARATION OF AGENTS TO BE USED IN THE TREATMENT OF SEWAGE
PITRESCENT OR PUTRESCIBLE MATTERS
AND OTHER LIQUID OR QEMI LIQUID
PROVISIONAL SPECIFICATION left by the said William Cameron Sillar and
John William Slater at the Office of the Commissioners of Patents on the
3rd March 1883.
WILLIAM CAMERON SILLAR of Blackheath in the County of Kent Gentleman
and JOHN WILLIAM SLATER of Tollington Park in the County of Middlesex
Analytical Chemist IMPROVEMENTS IN THE PREPARATION OF AGENTS TO BE
USED IN THE TREATMENT OF SEWAGE AND OTHER LIQUID OR SEMI LIQUID
PUTRESCENT OR PUTRESCIBLE MATTERS AND IMPROVEMENTS IN THE TREATMENT
OF SUCH MATTERS"
Our invention consists first of the process hereinafter described of preparing a
crude muriate of alumina or crude muriates of alumina and iron for use in the
purification of sewage and other liquid or semi liquid putrescent or putrescible
matters.
According to this part of our Invention we make a solution of sulphate of
alumina in water or we lixiviate with water any shales earths or other minerals
containing sulphate of alumina either alone or in conjunction with sulphate of iron
and either in a raw or natural condition or after previous ustulation or burning as
may in any case be found most suitable. We mix the solution thus obtained
either with or without previous concentration by evaporation with a solution of
chloride of calcium (which is a waste product in districts where the alkali manu-
facture is carried on) in such proportions that all the sulphuric acid present may
combine with the lime of the chloride of calcium and be deposited in the state of
sulphate of lime whilst the alumina (in the case of shales earths or other minerals
containing no sulphate of iron) remains in solution as chloride of aluminium
commonly known as muriate of alumina. In cases where the minerals treated
contain both sulphate of alumina and sulphate of iron the alumina and the iron
present remain in solution as chlorides of aluminium and of iron commonly known
as muriates of alumina and of iron. We draw off the liquid from the deposit of
the sulphate of lime aforesaid and use the said liquid for the treatment and
purification by precipitation of sewage foecal matters blood the liquid organic
refuse of manufactories and other like matters and in such treatment and purification
of sewage and other matters we use the solution of muriate of alumina or of
muriate of alumina and muriate of iron either alone or in conjunction with animal
charcoal wood peat or sea weed charcoal carbonaceous residues clay and lime
according to the nature of the sewage or other liquid refuse
The deposit of sulphate of lime after the muriate of alumina has been run off
may be used either as a manure or for any other purpose to which sulphate of lime

page_text: Our invention consists further of the method hereinafter described of preparing
agents for use in the treatment of sewage and other liquid or semi liquid
putrescent or putrescible matters from the precipitate obtained by treating sewage
by certain processes.
We have observed that some kinds of sewage such as that of certain manufacturing
towns and mine drainage is very poor in matters of a manurial value and even
sometimes contains solutions of copper lead tin zinc and other matters hurtful to
vegetation and to the soil so that the deposit or sediment obtained by treating
such sewage and refuse liquids is of little or no value as manure. Therefore after
treating such sewage as hereinbefore described or by the process known as the A B C
process and described in the specification of Letters Patent granted to William
Cameron Sillar, Robert George Sillar and George William Wigner and bearing
date the 15 June 1868 or by any other process in which compounds of aluminium
or common clay or both are or is employed we take the mud deposit or precipitate
thereby obtained and after draining drying or partially drying it we mix with it
sulphuric acid or muriatic acid or both in such proportions as to combine with the
alumina present or in some cases to leave a little free acid. We allow the mixture
of such mud deposit or precipitate and of acid or acids to stand for a sufficient time
to allow such acid or acids to act upon and combine with the alumina or hydrate
of alumina or sub salts of alumina or clay present. In some cases we apply steam
or other heat to the said mixture to promote the action of the said acid or acids
upon the said alumina or hydrate of alumina or sub salts of alumina or clay.
Our invention relates further to the precipitation of sewage and other liquid or
semi liquid putrescent or putrescible matters and this part of our said Invention
consists in the use in the treatment of the said matters of the compound produced
by and resulting from the process hereinbefore last described the said compound
being used either in a wet or in a dry state and either by itself or in conjunction
or admixture with other precipitating or purifying agents.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said William Cameron Sillar and John William Slater in the Great
Seal Patent Office on the 3rd September 1883.
WILLIAM CAMERON SILLAR of Blackheath in the County of Kent Gentleman
and JOHN WILLIAM SLATER of Tollington Park in the County of Middlesex
Analytical Chemist "IMPROVEMENTS IN THE PREPARATION OF AGENTS TO BE
USED IN THE TREATMENT OF SEWAGE AND OTHER LIQUID OR SEMI LIQUID
PUTRESCENT OR PUTRESCIBLE MATTERS AND-IMPROVEMENTS-IN--THE--TREATMENT
OF SUCH MATTERS."
"
Our invention consists first of the process hereinafter described of preparing a
crude muriate of alumina or crude muriates of alumina and iron for use in the
purification of sewage and other liquid or semi-liquid putrescent or putresciblé
matters
According to this part of our Invention we make a solution of sulphate of
alumina in water or we lixiviate with water any shales earths or other minerals
containing sulphate of alumina either alone or in conjunction with sulphate of iron
and either in a raw or natural condition or after previous ustulation or burning as
may in any case be found most suitable. We mix the solution thus obtained
(either after concentrating it by evaporation or without concentrating it) with a
solution of chloride of calcium (which is a waste product in districts where the
alkali manufacture is carried on) in such proportions that all the sulphuric acid
present may combine with the lime of the chloride of calcium and be deposited in
the state of sulphate of lime whilst the alumina (in the case of shales earths or
other minerals containing no sulphate of iron) remains in solution as chloride of
aluminium commonly known as muriate of alumina. In cases where the minerals
treated contain both sulphate of alumina and sulphate of iron the alumina and the
iron present remain in solution as chlorides of aluminium and of iron commonly
known as muriates of alumina and of iron. We draw off the liquid from the
deposit of the sulphate of lime aforesaid and use the said liquid for the treatment
and purification by precipitation of sewage foecal matters blood the liquid organic
refuse of manufactories and other like matters and in such treatment and
purification of sewage and other matters we use the solution of muriate of alumina
or of muriate of alumina and muriate of iron either alone or in conjunction with
animal charcoal wood peat or sea weed charcoal carbonaceous residues clay and lime
according to the nature of the sewage or other liquid refuse.
The deposit of sulphate of lime after the muriate of alumina has been run off
may be used either as a manure or for any other purpose to which sulphate of lime
is applicable.
Our invention consists further of the method herein after described of preparing
agents-for-use-in the treatment of sewage and other liquid or semi-liquid putrescent
or putreseible matters-from-the-precipitate obtained by treating sewago-by-eertain
processes.
We have observed that some kinds of sewage such as that of certain manu-
facturing towns-and-mine-drainage is very poor in matters of a manurial-value and
even sometimes-contains solutions of copper-lead-tin zine and other-matters-hurtful
to-vegetation-and to the soil so that the deposit or sediment obtained by treating
such-sewage-and-refuse-liquids is of little or no value-as-manure. Therefore-after
treating such sewage as hereinbefore described or by the process known as the
A B C process and described in the specification of Letters Patent granted to

page_text: William Cameron Sillar, Robert George Sillar and George William Wigner-and
bearing date 15 June 1868 or by any other process in which compounds of
aluminium or common clay or both are or is employed we take the mud deposit
or-precipitate thereby obtained and after draining drying or partially drying-it-we
mix-with-it-sulphuric acid or muriatic acid or both in such proportions as to
combine with the alumina present or in some enses to leave a little free acid-We
allow the mixture of such mud deposit or precipitate and of acid or acids to stand
for a sufficient time to allow such acid or acids to not upon and combine with the
alumina or bydrate of alumina or sub calts of alumina or clay present.-In some
eases we apply steam or other beat to the said mixture to promote the nation of the
said aoid or acids upon the said alumina or bydrate of alumina or subsalts of
alumina-or-elay.
Our invention relates further to the precipitation of sewage and other liquid or
semi--liquid-putrescent or putrescible-matters and this part of our said invention
consists in the use in the treatment of the said matters of the compound-produced
by and resulting from the process hereinbefore last described the said compound
being used either in a wet or in a dry state and either by itself or in conjunction or
admixture with other precipitating or purifying-agents.
Having thus described our Invention of "Improvements in the preparation of
agents to be used in the treatment of sewage and other liquid or semi liquid
putrescent or putrescible matters and improvements in the treatment-of-such
matters we wish it to be understood that we make no general claim to the use
of muriate of alumina for the treatment of sewage as we are aware that muriate of
alumina prepared by methods other than those hereinbefore described has been used
for that purpose but we claim
First The preparation of crude muriate of alumina or muriate of alumina and iron
for use in the treatment of sewage by mixing a solution of sulphate of alumina or
the lixivium of shales or other minerals containing sulphate of alumina alone or
sulphate of alumina and sulphate of iron with a solution of chloride of calcium
substantially as herein before described.
Secondly The preparation of an agent for use in the purification of sewage by
adding sulphuric acid-or-muriatic acid or both to the deposit-or-sediment obtained
by treating sewage by any process in which salts of alumina or clay or salts of
alumina-and-elay have been used substantially-as-hereinbefore described.
Thirdly The use in the treatment of sewage of the produst resulting from-the
treatment with sulphuric acid or muriatic acid-or both of the mud-or-precipitate
produced by treating sewage by any-process-in-which-salts of alumina or clay or
salts-of-ulumina-and-olay-are-used.
In witness whereof I the said John William Slater have hereunto set my hand
and seal this thirty-first day of August in the year of our Lord one thousand
eight hundred and eighty three

page_text: We WILLIAM CAMERON SILLAR of Blackheath in the County of Kent Gentleman
and JOHN WILLIAM SLATER of Tollington Park in the County of Middlesex
Analytical Chemist hereby request leave to amend the specification of Letters
Patent No 1144 dated the 3rd day of March 1883 as shown in red ink in the
accompanying copy of the said specification as amended in accordance with leave
granted to us on the 2nd day of October 1884 and we further request that the said
Letters Patent may be amended by striking out therefrom that part of the title of
the invention which was struck out from the original specification in accordance
with leave granted as aforesaid and by striking out from the said Letters Patent
all reference to the hereinbefore named William Cameron Sillar. Or that new
Letters Patent for the invention described in the aforesaid amended specification
may be issued to the hereinbefore named John William Slater alone in lieu of the
original Letters Patent herein before referred to
Our reasons for making the said requests are as follows:--
1. That the title of the invention as stated in the said Letters Patent does not
accord with the title as stated in the said amended specification.
2. That the whole of that part of the subject matter of the said specification
which was contributed by the hereinbefore named William Cameron Sillar was
struck out from the original specification by the amendment for which leave was
granted as hereinbefore stated and that the subject matter of the said specification
as amended comprises only the invention of the herein before named John William
Slater and that therefore the validity of the said Letters Patent may be disputed
on the ground that one of the Patentees (namely the hereinbefore named William
Cameron Sillar) is not the inventor of any part of the invention described in the
said amended specification.
"
T
3000

page_text: In the Matter of the Application made by William Cameron Sillar and John
William Slater for leave to amend the Specification of Letters Patent Nº 1144
of 1883:
of 1883.
DECISION.
I hereby grant leave to the said William Cameron Sillar and John William
Slater to amend the said Specification in the manner proposed; but I am not
aware of any provision of the Act which gives me power to amend the Letters 10
Patent, and I cannot, therefore, amend the said. Patent.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said William Cameron Sillar and John William Slater in the Great
Seal Patent Office on the 3rd September 1883.
WILLIAM CAMERON SILLAR of Blackheath in the County of Kent Gentleman
and I JOHN WILLIAM SLATER of Tollington Park in the County of Middlesex
Analytical Chemist "IMPROVEMENTS IN THE PREPARATION OF AGENTS TO BE
USED IN THE TREATMENT OF SEWAGE AND OTHER LIQUID OR SEMI LIQUID
PUTRESCENT OR PUTRESCIBLE MATTERS."
Our My invention consists of the process hereinafter described of preparing a
crude muriate of alumina or crude muriates of alumina and iron for use in the
purification of sewage and other liquid or semi-liquid putrescent or putrescible
matters.
According to our my Invention we I make a solution of sulphate of alumina
in water or we I lixiviate with water any shales earths or other minerals con-
taining sulphate of alumina either alone or in conjunction with sulphate of iron
and either in a raw or natural condition or after previous ustulation or burning
as may in any case be found most suitable. We I mix the solution thus obtained
(either after concentrating it by evaporation or without concentrating it) with a
solution of chloride of calcium (which is a waste product in districts where the
alkali manufacture is carried on) in such proportions that all the sulphuric acid
present may combine with the lime of the chloride of calcium and be deposited in
the state of sulphate of lime whilst the alumina (in the case of shales earths or
other minerals containing no sulphate of iron) remains in solution as chloride of
aluminium commonly known as muriate of alumina. In cases where the minerals
treated contain both sulphate of alumina and sulphate of iron the alumina and the
iron present remain in solution as chlorides of aluminium and of iron commonly
known as muriates of alumina and of iron. We I draw off the liquid from the
deposit of the sulphate of lime aforesaid and use the said liquid for the treatment
and purification by precipitation of sewage foecal matters blood the liquid organic
refuse of manufactories and other like matters and in such treatment and purifi-
cation of sewage and other matters we I use the solution of muriate of alumina
or of muriate of alumina and muriate of iron either alone or in conjunction with
animal charcoal wood peat or sea weed charcoal carbonaceous residues clay and
lime according to the nature of the sewage or other liquid refuse.
The deposit of sulphate of lime after the muriate of alumina has been run off
may be used either as a manure or for any other purpose to which sulphate of lime
is applicable.

page_text: Having thus described our my Invention of "Improvements in the preparation
of agents to be used in the treatment of sewage and other liquid or semi liquid
putrescent or putrescible matters" we I wish it to be understood that we I make
no general claim to the use of muriate of alumina for the treatment of sewage as
we-are I am aware that muriate of alumina prepared by methods other than those
hereinbefore described has been used for that purpose but we I claim
The preparation of crude muriate of alumina or muriate of alumina and iron for
use in the treatment of sewage by mixing a 'solution of sulphate of alumina or the
lixivium of shales or other minerals containing sulphate of alumina alone or sulphate
of alumina and sulphate of iron with a solution of chloride of calcium substantially
as herein before described.
In witness whereof I the said John William Slater have hereunto set my hand
and seal this thirty-first day of August in the year of our Lord one thousand
eight hundred and eighty three.

page_text: LETTERS PATENT to William Cameron Sillar of Blackheath in the County of
Kent Gentleman and John William Slater of Tollington Park in the County
of Middlesex Analytical Chemist for an Invention of "IMPROVEMENTS IN
THE PREPARATION OF AGENTS TO BE USED IN THE TREATMENT OF SEWAGE
AND OTHER LIQUID OR SEMI LIQUID PUTRESCENT OR PUTRESCIBLE MATTERS
AND IMPROVEMENTS IN THE TREATMENT OF SUCH MATTERS.
PROVISIONAL SPECIFICATION left by the said William Cameron Sillar and
John William Slater at the Office of the Commissioners of Patents on the
3rd March 1883.
WILLIAM CAMERON SILLAR of Blackheath in the County of Kent Gentleman
and JOHN WILLIAM SLATER of Tollington Park in the County of Middlesex
Analytical Chemist "IMPROVEMENTS IN THE PREPARATION OF AGENTS TO BE
USED IN THE TREATMENT OF SEWAGE AND OTHER LIQUID OR SEMI LIQUID
PUTRESCENT OR PUTRESCIBLE MATTERS AND IMPROVEMENTS IN THE TREATMENT
OF SUCH MATTERS
"
Our invention consists first of the process hereinafter described of preparing a
crude muriate of alumina or crude muriates of alumina and iron for use in the
purification of sewage and other liquid or semi liquid putrescent or putrescible
matters.
According to this part of our Invention we make a solution of sulphate of
alumina in water or we lixiviate with water any shales earths or other minerals
containing sulphate of alumina either alone or in conjunction with sulphate of iron
and either in a raw or natural condition or after previous ustulation or burning as
y in any case be found most suitable. We mix the solution thus obtained
her with or without previous concentration by evaporation with a solution of
ide of calcium (which is a waste product in districts where the alkali manu-
ature is carried on) in such proportions that all the sulphuric acid present may
combine with the lime of the chloride of calcium and be deposited in the state of
sulphate of lime whilst the alumina (in the case of shales earths or other minerals

page_text: containing no sulphate of iron) remains in solution as chloride of aluminium
commonly known as muriate of alumina. In cases where the minerals treated
contain both sulphate of alumina and sulphate of iron the alumina and the iron
present remain in solution as chlorides of aluminium and of iron commonly known
as muriates of alumina and of iron. We draw off the liquid from the deposit of
the sulphate of lime aforesaid and use the said liquid for the treatment and
purification by precipitation of sewage foecal matters blood the liquid organic
refuse of manufactories and other like matters and in such treatment and purification
of sewage and other matters we use the solution of muriate of alumina or of
muriate of alumina and muriate of iron either alone or in conjunction with animal
charcoal wood peat or sea weed charcoal carbonaceous residues clay and lime
according to the nature of the sewage or other liquid refuse
The deposit of sulphate of lime after the muriate of alumina has been run off
may be used either as a manure or for any other purpose to which sulphate of lime
is applicable.
Our invention consists further of the method hereinafter described of preparing
agents for use in the treatment of sewage and other liquid or semi liquid
putrescent or putrescible matters from the precipitate obtained by treating sewage
by certain processes.
We have observed that some kinds of sewage such as that of certain manufacturing
towns and mine drainage is very poor in matters of a manurial value and even
sometimes contains solutions of copper lead tin zinc and other matters hurtful to
vegetation and to the soil so that the deposit or sediment obtained by treating
such sewage and refuse liquids is of little or no value as manure. Therefore after
treating such sewage as herein before described or by the process known as the A B C
process and described in the specification of Letters Patent granted to William
Cameron Sillar, Robert George Sillar and George William Wigner and bearing
date the 15 June 1868 or by any other process in which compounds of aluminium
or common clay or both are or is employed we take the mud deposit or precipitate
thereby obtained and after draining drying or partially drying it we mix with it
sulphuric acid or muriatic acid or both in such proportions as to combine with the
alumina present or in some cases to leave a little free acid. We allow the mixture
of such mud deposit or precipitate and of acid or acids to stand for a sufficient time
to allow such acid or acids to act upon and combine with the alumina or hydrate
of alumina or sub salts of alumina or clay present. In some cases we apply steam
or other heat to the said mixture to promote the action of the said acid or acids
upon the said alumina or hydrate of alumina or sub salts of alumina or clay.
Our invention relates further to the precipitation of sewage and other liquid or
semi liquid putrescent or putrescible matters and this part of our said Invention
consists in the use in the treatment of the said matters of the compound produced
by and resulting from the process herein before last described the said compound
being used either in a wet or in a dry state and either by itself or in conjunction
or admixture with other precipitating or purifying agents.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said William Cameron Sillar and John William Slater in the Great
Seal Patent Office on the 3rd September 1883.
"
WILLIAM CAMERON SILLAR of Blackheath in the County of Kent Gentleman
and JOHN WILLIAM SLATER of Tollington Park in the County of Middlesex
Analytical Chemist IMPROVEMENTS IN THE PREPARATION OF AGENTS TO BE
USED IN THE TREATMENT OF SEWAGE AND OTHER LIQUID OR SEMI LIQUID
PUTRESCENT OR PUTRESCIBLE MATTERS AND IMPROVEMENTS IN THE TREATMENT
OF SUCH MATTERS."
Our invention consists first of the process hereinafter described of preparing a
crude muriate of alumina or crude muriates of alumina and iron for use in the
purification of sewage and other liquid or semi-liquid putrescent or putrescible
matters
According to this part of our Invention we make a solution of sulphate of
alumina in water or we lixiviate with water any shales earths or other minerals
containing sulphate of alumina either alone or in conjunction with sulphate of iron
and either in a raw or natural condition or after previous ustulation or burning as
may in any case be found most suitable. We mix the solution thus obtained
(either after concentrating it by evaporation or without concentrating it) with a
solution of chloride of calcium (which is a waste product in districts where the
alkali manufacture is carried on) in such proportions that all the sulphuric acid
present may combine with the lime of the chloride of calcium and be deposited in
the state of sulphate of lime whilst the alumina (in the case of shales earths or
other minerals containing no sulphate of iron) remains in solution as chloride of
aluminium commonly known as muriate of alumina. In cases where the minerals
treated contain both sulphate of alumina and sulphate of iron the alumina and the
iron present remain in solution as chlorides of aluminium and of iron commonly
known as muriates of alumina and of iron. We draw off the liquid from the
deposit of the sulphate of lime aforesaid and use the said liquid for the treatment
and purification by precipitation of sewage foecal matters blood the liquid organic
refuse of manufactories and other like matters and in such treatment and
purification of sewage and other matters we use the solution of muriate of alumina
or of muriate of alumina and muriate of iron either alone or in conjunction with
animal charcoal wood peat or sea weed charcoal carbonaceous residues clay and lime
according to the nature of the sewage or other liquid refuse.
The deposit of sulphate of lime after the muriate of alumina has been run off
may be used either as a manure or for any other purpose to which sulphate of lime
is applicable.
Our invention consists further of the method herein after described of preparing
agents for use in the treatment of sewage and other liquid or semi liquid putrescent
or putrescible matters from the precipitate obtained by treating sewage by certain
processes.
We have observed that some kinds of sewage such as that of certain manufacturing
towns and mine drainage is very poor in matters of a manurial value and even
sometimes contains solutions of copper lead tin zinc and other matters hurtful to
vegetation and to the soil so that the deposit or sediment obtained by treating such
sewage and refuse liquids is of little or no value as manure. Therefore after
treating such sewage as herein before described or by the process known as the ABC
process and described in the specification of Letters Patent granted to William
Cameron Sillar, Robert George Sillar and George William Wigner and bearing

page_text: date 15 June 1868 or by any other process in which compounds of aluminium or
common clay or both are or is employed we take the mud deposit or precipitato
thereby obtained and after draining drying or partially drying it we mix with it
sulphuric acid or muriatic acid or both in such proportions as to combine with the
alumina present or in some cases to leave a little free acid. We allow the mixture
of such mud deposit or precipitate and of acid or acids to stand for a sufficient
time to allow such acid or acids to act upon and combine with the alumina or
hydrate of alumina or sub salts of alumina or clay present. In some cases we apply
steam or other heat to the said mixture to promote the action of the said acid or
acids upon the said alumina or bydrate of alumina or subsalts of alumina or clay.
Our invention relates further to the precipitation of sewage and other liquid or
semi liquid putrescent or putrescible matters and this part of our said invention
consists in the use in the treatment of the said matters of the compound produced
by and resulting from the process herein before last described the said compound
being used either in a wet or in a dry state and either by itself or in conjunction or
admixture with other precipitating or purifying agents.
31
Having thus described our Invention of " Improvements in the preparation of
agents to be used in the treatment of sewage and other liquid or semi liquid
putrescent or putrescible matters and improvements in the treatment of such
matters we wish it to be understood that we make no general claim to the use
of muriate of alumina for the treatment of sewage as we are aware that muriate of
alumina prepared by methods other than those hereinbefore described has been used
for that purpose but we claim
First The preparation of crude muriate of alumina or muriate of alumina and iron
for use in the treatment of sewage by mixing a solution of sulphate of alumina or
the lixivium of shales or other minerals containing sulphate of alumina alone or
sulphate of alumina and sulphate of iron with a solution of chloride of calcium
substantially as hereinbefore described.
Secondly The preparation of an agent for use in the purification of sewage by
adding sulphuric acid or muriatic acid or both to the deposit or sediment obtained
by treating sewage by any process in which salts of alumina or clay or salts of
alumina and clay have been used substantially as hereinbefore described.
Thirdly The use in the treatment of sewage of the product resulting from the
treatment with sulphuric acid or muriatic acid or both of the mud or precipitate
produced by treating sewage by any process in which salts of alumina or clay or
salts of alumina and clay are used.
In witness whereof I the said John William Slater have hereunto set my hand
and seal this thirty-first day of August in the year of our Lord one thousand
eight hundred and eighty three