Year: 1896

page_text: Date of Application, 6th May, 1896
Complete Specification Left, 28th Oct.. 1896-Accepted, 19th Dec., 1896
HERBERT WALKER Civil Engineer Newcastle Chambers Angel Row Nottingham
do hereby declare the nature of this invention to be as follows:-
The object of this invention is to provide a more simple method of precipitating
and taking out sludge precipitated from sewage, and improved arrangements for
cleaning out the sludge pipes.
Sewage precipitation tanks constructed in accordance with my invention
represent a cylinder with the lower part cut on the incline, the highest point of
the incline is about half way down the depth of the tank and the lowest point of
the incline terminates near the opposite side of the cylinder bottom. I thus form
a sloping bottom with a small flat surface at the deep part of the tank, so that the
sludge precipitated may slide down the slope and gather at a place near the side
of the tank.
The entrance for sewage is made near the top of the incline passing through a
pipe laid with a fall, so that the sewage entering the tank does not disturb the
effluent sewage water passing off, also giving a better chance for the solid matter
to settle quickly at the lowest part.
At the opposite side of the tank a sludge pipe is placed with the lower end near
the lowest part of the tank, the top of the pipe terminates above the sewage
precipitation tank with a flange having a hole and plug, so that a rod may be
inserted when needful to clean out the vertical pipe..
Near the top of the vertical pipe but lower than the overflow for sewage effluent
I have a branch pipe passing out of the vertical pipe under the effluent channel
with a valve and opposite this branch pipe I have a hole with plug in the vertical
pipe so that I may also pass a rod through for cleaning when needful.
As these pipes pass to the lowest part of the tank and as the head of sewage is
greater owing to the branch pipe being below the level of sewage effluent it is
obvious that sludge will be passed up the vertical pipe and through the branch
pipe when the valve is opened.
The overflow or effluent channel is constructed round the top of the tank with
outlet to convey the effluent to filter beds or upon land if desired.
By these arrangements the sewage will enter at a point to aid precipitation and
the precipitated sludge is gathered at a point where it is easily drawn off, by pipes
which are simple in construction and convenient to work.
Dated this 4th day of May 1896.
HERBERT WALKER.

page_text: HERBERT WALKER Newcastle Chambers Angel Row Nottingham 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:-
The object of this invention is to provide a more simple method of precipitating
and taking out sludge precipitated from sewage, and improved arrangements for
cleaning out the sludge pipes.
Sewage precipitation tanks constructed in accordance with my invention
represent a cylinder with the lower part cut on the incline. The highest point of
the incline is about half way down the depth of the tank and the lowest point of
the incline terminates near the opposite side of the cylinder bottom. I thus form
a sloping bottom with a small flat surface at a deep part of the tank so that the
sludge precipitated may slide down the slope and gather at a place near the side
of the tank.
The entrance for sewage is made near the top of the incline, passing through a
pipe laid with a fall, so that the sewage entering the tank does not disturb the
effluent sewage water passing off, also giving a better chance for the solid matter
to settle quickly at the lowest part.
At the opposite side of the tank a sludge pipe is placed with the lower end near
the lowest part of the tank; the top of the pipe terminates above the sewage
precipitation tank with a flange having a hole and plug so that a rod may be
inserted when needed to clean out the vertical pipe.
Near the top of the vertical pipe but lower than the overflow for sewage effluent
I have a branch pipe passing out of the vertical pipe under the effluent channel
with a valve, and opposite this branch pipe I have a hole with plug in the vertical
pipe so that I may also pass a rod through for cleaning when needful.
As these pipes pass to the lowest part of the tank and as the head of sewage is
greater owing to the branch pipe being below the level of sewage effluent, it is
obvious that sludge will be passed up the vertical pipe and through the branch
pipes when the valve is opened.
The overflow or effluent channel is constructed round the top of the tank with
outlet to convey the effluent to filter beds or upon land if desired.
By these arrangements the sewage will enter at a point to aid precipitation and
the precipitated sludge is gathered at a point where it is easily drawn off by pipes
which are simple in construction and convenient to work.
My invention is illustrated in the accompanying drawings.
Figure 1 is a vertical section of a sewage precipitation tank with my
improvements.
Figure 2 is a plan of the tank.
The sewage coming from the outfall sewer is passed into the open channel a
where it is mixed with chemicals to aid precipitation afterwards passing down the
vertical pipe 6 and into the tank at d.
The position of inlet may however be at the top of the sloping bottom shewn in
dotted lines r.
When the sewage contains quantities of fat or other floating matter I provide a
scum wall shewn in dotted lines at s, t.
It will be seen that the lower part of the tank e is below the inlet for sewage
and as the sewage is mixed with chemicals to aid precipitation the solid matter
may precipitate without rising to the top of the tank, and as it precipitates the
sloping bottom of the tank fg will help the solid matter to the bottom.

page_text: As the sewage continues to flow it will reach the top of the tank at h relieved
of the solids, and pass into the circular channel in effluent condition, then out
through the channel k to filter beds or upon land if desired.
When a quantity of sewage sludge has accumulated at the bottom of the tank
it is drawn off by the pipe through the branch pipe m by opening the valve n.
The sludge may flow from this point to a sludge well for treatment by filter
presses or upon land.
If the sludge pipes become choked they are cleared by passing a rod through
plug holes o and p. These holes are fitted with gunmetal screwed plugs which
may be removed very quickly. The sewage is lowered in the tank by the valve q
when found necessary to put a rod through the plug hole p.
If the level of site will allow sufficient fall a valve may also be placed at the
bottom of the tank for emptying in case of repairs or cleaning out.
A number of these sewage precipitation tanks may be constructed at one works
and they may be used continuously or intermittently, in the latter case a sluice is
placed in the inlet channel a.
By these improvements I gain advantage in precipitating the solid matter, from
the position of the inlet for sewage inside the tank and give the sewage a time to
throw down its solids before passing away over the top. I also provide a simple
and convenient means to take out the sludge by the pipes being situated near the
side of the tank, and a sludge sump formed at the lowest part, assisted in the
collection of sludge at this point by the sloping bottom of the tank.
The plug holes for cleaning out are simple and efficient.
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 sewage precipitation tanks, the inlet for sewage, sloping bottom, and sludge
outlet pipes substantially as herein shewn and described.
Dated this 27th day of October 1896.