Improvements in Means for Expelling Liquid from and Compressing Sewage Sludge and other Semi-fluid or Plastic Substances.
Year: 1888

page_text: Date of Application, 9th June, 1888
Complete Specification Left, 9th Apr., 1889
Complete Specification Accepted, 18th May, 1889
Improvements in Means for Expelling Liquid from and Compressing
Sewage Sludge and other Semi-fluid or Plastic Substances.
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:-
The object of the present invention is to provide ready and effective means for
expelling water, or other liquids, or expressing moisture from solid, or insoluable sub-
stances when held in a fluid, semi-fluid, or plastic condition, and in certain cases
moulding the products in order to render the said products more commercially
useful.
In carrying out my invention in practice, I employ a mould to contain the material
to be operated upon, so constructed as to allow or permit the water, moisture, or
liquid to be freely expelled, or expressed, by means of an hydraulic or other suitable
press, and to retain the solid matters and compress them into blocks of any size, or
shape, that may be desired, so rendering them more portable, or more readily dealt
with.
The said mould may be made of metal wood, or other suitable material, and the
walls and top of sufficient strength to resist the pressure required, the top may con-
stitute the head of the plunger of the press and may have any desired pattern or
device cut upon it, to be impressed upon the substance in the mould. Such
pattern, or device need not necessarily be formed upon the plunger, but may be
cut upon a plate which can be attached thereto. The bottom of the said mould
I prefer to be loose, or a false bottom, so constructed that it may overlap the sides
or walls, or may fit or dove-tail therein. This bottom, which may be of any
thickness, but preferably very thin, I perforate with holes, and when the mould
15 ready to be, or is charged, I place it on the table or bed plate of the press,
which I cover first with a sheet or piece of felt or other suitable porous material,
on the top of which I place a piece, or sheet of linen, or other suitable textile
fabric, or wire or other gauze, to prevent the felt or porous material being choked
or rendered useless by contact with the substance under treatment. In some cases

page_text: I may use both linen or other textile fabric, and wire or other gauze. By this
arrangement the sides and the top of the mould and the table or bed plate
of the press being of sufficient strength, any pressure can be brought to bear on the
material contained therein, whilst the false bottom of the mould can be readily
removed and the contents easily dealt with. The liquid portion is freely expelled
by being driven through the holes in, the false bottom, then through the linen or
gauze and felt. The sides or walls of the mould may be fixed to the press, to
prevent shifting when the plunger of the press is applied
The table or bed plate of the press may be formed in one or more pieces and may
work on pivots or hinges for the greater convenience of removing the compressed
products from the mould.
My invention is specially intended for the treatment of sewage sludge, after it has
been precipated, or caused to settle by any suitable process; but it can be adopted
for the treatment of peat, whiting, cement, china-clay and other substances, where it
is desirable to separate the liquid from the solid portions.
1
T
1000
AMBROSE MYALL,
21, Cockspur Street, S.W.,
Agent for the Applicant.

page_text: Sewage Sludge and other Semi-fluid or Plastic Substances.
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:
The object of my invention is to provide ready and effective means for expelling
water, or other liquids, or expressing moisture from solid, or insoluble substances,
when held in a fluid, semi-fluid, or plastic condition, and in certain cases moulding
the products in order to render them more commercially useful.
In carrying out my invention in practice, I employ a mould to contain the material
to be operated upon, so constructed as to allow or permit the water, moisture, or
liquid, to be freely expelled, or expressed, by means of an hydraulic, or other suitable
press, and to retain the solid matters and compress them into blocks of any size, or
shape, that may be desired, so rendering them more portable, or more readily dealt
with.
The said mould may be made of metal, wood, or other suitable material, the walls
and top being of sufficient strength to resist the pressure required, the top may con-.
statute the head of the the plunger of the press, and may have any desired pattern or
device cut upon it, to be impressed upon the substance in the mould. Such pattern,
or device need not necessarily be formed upon the plunger, but may be cut upon a
plate which can be attached thereto. The bottom of the said mould I prefer to be
foose, or a false bottom, so constructed that it may overlap the sides or walls, or may
fit or dove-tail therein. This bottom, which may be of any thickness, I perforate
with holes, and when the mould is ready to be, or is charged, I place it on the table
or bed-plate of the press, which I cover first with a sheet or piece of felt, or other
suitable porous material, on the top of which, I place a piece, or sheet of linen, or
other suitable textile fabric, or wire, or other gauze, to prevent the felt or porous
material being choked, or rendered useless by contact with the substance under
treatment. In some cases I may use both linen or other textile fabric, and wire or
other gauze. By this arrangement the sides, and the top of the mould and the table or
bed-plate of the press being of sufficient strength, any desired pressure can be brought
to bear on the material contained therein, whilst the false bottom of the mould can
be readily removed and the contents easily dealt with. The liquid portion is freely
expelled by being driven through the holes in the false bottom, then through the
linen or gauze and felt. The sides or walls of the mould may be fixed to the press,
to prevent shifting when the plunger of the press is applied.
The table or bed-plate of the press may be formed in one or more pieces and
may work on pivots or hinges for the greater convenience of removing the compressed
products from the mould.

page_text: The objects of the loose or false bottom, and of the bed plate being made in more
than one piece, are to facilitate the removal of the contents of the mould after
pressure; therefore if the bed plate be constructed so as to form, or be used as a
false bottom itself, the upper loose bottom may be dispensed with. One or other of such
plates should be of sufficient strength to move intact the pressed materials. If the
loose or false bottom be of a certain thickness the perforations therein may be filled
up with pieces of felt sponge, tow, wool, or other soft substances, to prevent the
materials under pressure passing through the perforations and injuring the felt or
other filtering media, if used in conjunction therewith, but in this case the linen or
textile fabric or the felt or both may be dispensed with.
It is obvious that if desired the arrangement of my apparatus may be reversed,
to wit, the top of the mould may be contrived for the escape of the fluids, while the
bottom may be used for the pattern or design.
My invention is specially intended for the treatment of sewage sludge, after it has
been precipitated or caused to settle by any suitable process, but it can also be used for
the treatment of peat, whiting, cement, china-clay and other substances, where it is
desirable to separate the liquid from the solid portions
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. In apparatus for expelling liquid from and compressing sewage sludge and
other semi-fluid or plastic substances, a mould having a perforated loose or false
bottom fitting within or extending beyond the sides or walls of the said mould, or
forming part of the bed-plate of the press, in combination with suitable porous filtering
media placed under, upon, or between the loose or false bottom and the bedplate
aforesaid, substantially as and for the purposes herein set forth
2 In apparatus for expelling liquid from and compressing sewage sludge and other
semi-fluid or plastic substances, a mould having a perforated loose or false bottom
fitting within or extending beyond the sides or walls of the said mould, or forming
part of the bed-plate of the press, and having the perforations filled in with suitable
filtering material, in combination with, or without the arrangement of filtering media
as described in the previous claim, substantially as and for the purposes herein set
forth.
D
1
ALL 1
1 1000
AMBROSE MYALL,
21, Cockspur Street, S. W.,
Agent for the Applicant.