Improvements in Apparatus for Filtering or Purifying Water, Sewage, or other Liquids.
Year: 1890

page_text: Date of Application, 24th Apr., 1890
Complete Specification Left, 24th Jan., 1891-Accepted, 7th Mar., 1891
PROVISIONAL SPECIFICATION.
Improvements in Apparatus for Filtering or Purifying Water,
Sewage, or other Liquids.
I, JAMES LONGSHAW, of Willow Bank, Kirkmanshulme Lane, Longsight,
Manchester, in the County of Lancaster, Consulting Chemist, do hereby declare
the nature of this invention to be as follows :-
This invention refers to that class of filtering apparatus in which a travelling
band or web of suitable material is used as the filtering medium, and although
primarily designed for separating the solid from the liquid part of sewage matter, it
may also be applied to the filtration of water or other liquids.
It consists essentially of a revolving perforated drum or cylinder, over the outside
of which is stretched an endless band or web of a filtering fabric, and in the inside
is placed or connected a syphon through which the effluent water flows.
In carrying out the invention, I construct a drum or cylinder mounted upon a
hollow shaft, or trunnions, upon which it can rotate. The peripheral shell or case
of the drum is made with a perforated part in the centre, and a non-perforated
portion at either side; with a flange at each edge. Connected with the hollow shaft
or trunnions, is a syphon by means of which the liquid from the interior of the drum
can be run off. The perforations in the drum or cylinder may be formed of holes cut,
punched, or drilled therein, or of slits or slots formed of bars, cast or made in the form
of a grating. An endless filtering band or web of a filtering fabric, passes over the
drum and over two three or more rollers at one side of the drum, for the purpose of
being cleansed while not in contact with the drum.
The filtering fabric as it leaves the drum, passes over a solid or non-perforated
roller and when passing over this roller is pressed or squeezed by one, two, or more
rollers with perforations or bars which act upon it to squeeze out the water with
which it is saturated, also the sludge or solid particles which are carried by it. As
the fabric passes from this roller back to the drun or cylinder, it is further acted
upon by two or more squeezing rollers and a jet of water pumped up from the
filtered water and forced through the fabric.
The drum is rotated by means of a cog wheel, pulley or other device and is set in
a tank or receiver, into which the sewage or other material is run. Two or more
filtering drums may be placed in the same tank.
In operation the sewage or other liquid is run into a large tank in which the
filtering drum or apparatus is fixed until the drum is nearly immersed therein.
The atmospheric pressure forces the liquid against and through the filtering fabric
and perforations, into the interior of the drum, and when it rises to a certain height
therein it is carried off by the syphon through the hollow shaft or trunnions. The
non-perforated sides and the flanges on the periphery of the drum, prevent the escape
of any of the liquid into the interior except through the filtering fabric. As the
drum rotates the filtering cloth passes between the squeezing and cleansing rollers
and is directed back to the surface of the drum by a guide roller. The tank being
deeper than the rotating drum the heavier part of the liquid may settle down
without coming in contact with the filtering cloth.
I am aware that a filtering fabric in the form of an endless band or web passing
over a concave surface, to which it is held by guide rollers, has been used for
filtering or separating purposes, and such does not in itself constitute my invention.
Dated this 23rd day of & nail 1900.
WM. P. THOMPSON & Co.,
6, Bank Street, Manchester, Patent Agents.

page_text: COMPLETE SPECIFICATION.
Improvements in Apparatus for Filtering or Purifying Water,
Sewage, or other Liquids.
I, JAMES LONGSHAW, of Kirkmanshulme Lane, Longsight, Manchester, in the
County of Lancaster, Consulting 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 :-
This invention relates to that class of filtering apparatus in which a travelling
band or web of suitable material is used as the filtering medium, and although
primarily designed for separating the solid from the liquid part of sewage matter it
may also be applied to the filtration of water or other liquids.
It consists essentially of a revolving perforated drum or cylinder set in a tank ori
other receptacle containing the material to be filtered over the outside of which is
stretched an endless band or web of a filtering fabric, and in the inside is placed or
connected a syphon or other pipe through which the effluent water flows.
It will be fully described with reference to the accompanying drawing in which
as an example the invention is shown as applied to a tank into which the liquid or
semi liquid matter to be filtered flows.
Fig. 1, is a side elevation partly in section.
Fig. 2, end elevation partly in section.
Fig. 3, enlarged clevation of drum for squeezing the filtering cloth.
Fig. 4, sectional elevation of same.
In the tank A, or other suitable receptacle to receive the sewage or other matter
to be filtered I place a perforated drum B, capable of revolving about its axis and
preferably mounted upon a hollow shaft or trunnions upon which it rotates.
The
peripheral shell of the drum B, is made with the central part perforated or cut with
slits C, and a part at either side of the perforations or slits C, which is
non-perforated, a flange 6 being provided at either side of the non-perforated
parts c.
.
The perforations in the periphery of the drum or cylinder B, may be in the form
of the slits C, or may be formed of holes cut, punched, or drilled therein, or of slits
or slots formed of bars, cast or made in the form of a grating.
Around the periphery of the drum or cylinder B, I place an endless band or
web D of felt or other filtering material. The fel. D, presses closely around the
periphery of the drum or cylinder B, and passes also over rollers E and F, placed
at one side of the drum so that it may be cleansed of the residual matter adhering
to it at each revolution of the drum.
The filtering felt or fabric D, when it leaves the periphery of the drum, passes
over the solid or non-perforated roller E, and when passing over this roller is
pressed or squeezed by one, two, or more rollers G, with perforations or bars which
act upon it to squeeze out the water with which it is saturated, also the sludge or
solid particles which are carried by it. As the filtering felt D passes from this
roller back to the drum or cylinder, it passes over two similarly constructed rollers H,
above which is placed a perforated pipe 1. From the perforated pipe I, a jet of
water is forced through the felt D from the inside which washes it and carries away
any solid particles left adhering after passing the squeezing rollers G. At either
side of the perforated pipe 1, is a slab of wood J, which keeps the pressure of the
felt off the pipe I, and against which it is squeezed by the squeezing roller H. The
felt then passes forward again around the periphery of the drum. A small pump
worked by the eccentric K, pumps the water up to the perforated pipe I, from the
effluent water issuing from the apparatus or from other clear water supply.
The flanges on the drum B, keep the felt D, from slipping off or out of position,
it preferably fitting closely in between them and the non-perforated portion of the
periphery prevents the liquor flowing. in between the felt and the periphery without
passing through it.

page_text: The effluent water is withdrawn from the interior of the drum B, by means of a
syphon L, passing through a hollow trunnion or by any other suitable means such
as what are known as "buckets" in steam drying-cylinders or the like.
A number of doctors or scrapers O are placed at intervals in contact with the
filtering fabric to scrape off the sludge or solid particles adhering to the surface
thereof.
The drum B, is rotated by means of the cog wheels M and pulleys N, or other
device and is immersed in the sewage or other material in the tank or receiver, into
which it is run. Two or more filtering drums may be placed in the same tank.
C
In operation the sewage or other liquid is run into the tank A, in which the
filtering apparatus is fixed until the drum B, is nearly wholly immersed therein.
The atmospheric pressure forces the liquid against and through the filtering fabric D,
and the perforations C, into the interior of the drum B, and when the liquid rises to
a certain height therein it is carried off by the syphon L, through the hollow shaft
or trunnions. The non-perforated sides and the flanges on the periphery of the
drum prevent the escape of any of the liquid into the interior without passing
through the filtering fabric D. As the drum rotates the filtering cloth passes
between the squeezing and cleansing rollers E, and G, and is directed back to the
surface of the drum by a guide roller F. The tank being deeper than the rotating
drum the heavier part of the liquid may settle down without coming in contact with
the filtering cloth.
I am aware that a filtering fabric in the form of an endless band or web passing
over a concave surface, to which it is held by guide rollers, have been used
for filtering or separating purposes and such does not in itself constitute my
invention.
Having now particularly described and ascertained the nature of the said inven-
tion, and in what manner the same is to be performed, I declare that what I
claim is :-
1. An apparatus for filtering water or other liquids having a perforated drum or
cylinder with a filtering fabric fitted closely around the periphery to be immersed
in the liquid and through which the liquid flows into the interior of the drum
substantially as described.
2. A filtering apparatus having a rotating drum, an endless web of filtering
fabric, guide rollers E and F over which the fabric passes at the side of the drum
and squeezing rollers G and H with or without a perforated water pipe J, sub-
stantially as and for the purposes described.
3. A filtering apparatus constructed and arranged substantially as described and
shown.
Dated this 23rd day of January 1891.
WM. P. THOMPSON & Co.,
6, Bank Street, Manchester, Patent Agents.