An Appliance for Facilitating Withdrawal of Sludge or Deposit in Sewage Tanks; applicable also to Clarifying Water and other Liquids.
Year: 1892

page_text: Date of Application, 28th Sept., 1892
Complete Specification Left, 28th June, 1893-Accepted, 29th July, 1893
PROVISIONAL SPECIFICATION.
An Appliance for Facilitating Withdrawal of Sludge or Deposit in
Sewage Tanks; applicable also to Clarifying Water and other
Liquids.
I, ALBERT PLAYER ISAAC COTTERELL, of Lonsdale Chambers, Baldwin
Street, Bristol, Civil Engineer, do hereby declare the nature this invention to be
as follows:-
This invention has special reference to the process of precipitating in tanks
solids held in suspension in sewage. It consists in an appliance by which the
withdrawal of such solids is facilitated.
The said appliance is also applicable to clarifying water and other liquids
containing solids in suspension.
The appliance consists of a pipe extending from a pump, or the like, to a point
towards the bottom of the precipitation tank and provided thereat with a series of
nozzles. Through these nozzles jets of water are discharged by the pump or
other forcing appliance into the tank, and the solids in the sewage or other water
are caused to descend to and collect in the sludge pit.
Accordingly, a smaller proportion of water than hitherto is pumped up through
the sludge pipe, while the continuous precipitation in that part of the tank which
is above the nozzles is not prejudically affected.
The water injected through the nozzles may conveniently be supplied from the
tunk, or it may be otherwise obtained and may have added thereto a precipitant
or precipitants in suitable proportion.
Dated this 27th day of September 1892.
Agent.
COMPLETE SPECIFICATION.
An Appliance for Facilitating Withdrawal of Sludge or Deposit in
Sewage Tanks; applicable also to Clarifying Water and other
Liquids.
I, ALBERT PLAYER ISAAC Cotterell, of Lonsdale Chambers, Baldwin
Street, Bristol, Civil Engineer, 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 has special reference to the process of precipitating in tanks
solids held in suspension in sewage. It consists in an appliance by the use of
which the withdrawal of such solids is facilitated.
The said appliance is also applicable to clarifying water and other liquids
containing solids in suspension.
The appliance consists of a pipe extended from a pump, or the like, to a point
towards the bottom of the precipitation tank and provided thereat with a series of
nozzles. Through these nozzles jets of water are discharged by the pump or other
forcing appliance into the tank, and the solids in the sewage or other water are
caused to descend to and collect in the sludge pit.
Accordingly, a smaller proportion of water than hitherto is pumped up through
the sludge pipe, while the continuous precipitation in that part of the tank which
is above the nozzles is not prejudically affected.

page_text: In the accompanying sheet of drawings,
Fig. 1 represents, in vertical section, a sewage precipitation tank fitted with my
appliance for facilitating withdrawal of sludge or deposit. Fig. 2 is a transverse
section.
Extended downwards to a desired point towards the bottom of the tank is a
pipe a which, at the upper end, is connected to a pump or other liquid-injecting
appliance. At the point to which it is extended down into the tank the pipe a is
carried round the same and the hoop thus formed is fitted at intervals with nozzles
or spouts a so disposed and directed, as to create a rotary movement of the
contents of the tank and consequent scouring of the sludge into the lower part of
the tank.
-
The withdrawal of the sludge through the sludge discharge pipe b by means of
a pump, such as c is facilitated and expedited, and t.. relative proportion of water
discharged through the sludge pipe bin pumping up the deposit is reduced.
The water injected through the nozzles a¹ may conveniently be supplied from the
tank, or it may be otherwise obtained. To the water may be added a deodorant
or precipitant in suitable proportion. More than one ring of nozzles a¹ may be
employed and placed at such depths in the tank and at such distances apart as
may be desired.
It will be seen that foul water or water containing atter in suspension from
which it is desired to free it may be treated and trified by the use of the
appliance; the matter in suspension being precipitated and the supernatant
clarified water run off through the usual overflow pipe d.
Having now particularly described and ascertained the nature of my said
invention, and in what manner the same is to be performed, I declare that what
I claim is
In a sewage tank, or the like, the provision of a pipe such as a extended
down into the tank and carried therein, at any suitable depth or depths, around
the wall thereof and provided with nozzles such as a' for conveying and discharging
water, or other liquid, under pressure among the deposit in the tank, substantially
as hereinbefore described with reference to the accompanying sheet of drawings
and for the purposes specified.
Dated this 27th day of Tuno 1002