JPS5855801B2 - Sedimentation tank with filter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a settling tank used for settling wastewater treated by an activated sludge method, a rotary aeration method, a neutralization treatment of pickling wastewater, or the like.

Conventionally, in settling tanks used to settle sewage treated by the activated sludge method, rotary aeration method, or neutralization of pickling wastewater, there were many cases in which micro flocs carried over and deteriorated the quality of the treated water. .

The object of the present invention is to provide a settling chamber having an inlet and an outlet overflow base;
A drain port that communicates with the outlet side of the outflow overflow base and has a filter, an auxiliary drain port that drains treated water under certain conditions, a level meter that detects a water level at a certain height, and is activated by the detection signal of the level meter. It is an object of the present invention to provide a settling tank which is equipped with a filtration chamber having a backwashing mechanism for the filter, and is capable of removing even minute flocs.

The present invention will be described below based on an embodiment shown in the drawings.

1 is a precipitation chamber, 2 is an inlet, and an inflow pipe 3 is connected thereto.

4 is an inflow chamber, and 5 is its inflow overflow base.

6 is an outflow overflow base, and 7 is an outflow chamber.

Reference numerals 8 and 9 indicate partition walls, which are provided between the inflow overflow base 5 and the outflow overflow base 6 so as to block short-circuit water flow near the water surface.

10 is a filtration chamber, and a communication pipe 11 opens and communicates with the filtration chamber 10 from the outflow chamber 7.

Reference numeral 12 denotes a filter, which is attached to the inner end of the drain pipe 13 and serves as a drain port.

Reference numeral 14 denotes a level meter, which is provided to detect a water level at a certain height, and serves as a detector for detecting clogging of the filter 120.

15 is an auxiliary drain port, which is connected to an auxiliary drain pipe 16.

The auxiliary drain port 15 is provided at a position slightly above the water level at a certain height detected by the level meter 14, and this position is at a certain height higher than the normal water level.

The other end of the diagonal drainage pipe 16 communicates with a raw water tank which is treated by the activated sludge method, rotary aeration θ, neutralization of pickling wastewater, or the like.

Drain pipe 13 communicates with valve 1γ, and valve 17 opens to pump well 19 through drain pipe 18.

20 is a pump provided in the pump well 19, and the pump 20 communicates with the drain pipe 13 through communication pipes 21, 22, a valve 23, and a communication pipe 24.

Further, the pump 20 communicates with a discharge pipe 27 through communication pipes 21, 25 and a valve 26, and the discharge pipe 27 opens into the discharge area as appropriate.

28 and 29 are sludge cultivation pipes, and 30 is a valve.

The pump 20, pallets 7'' 17, 23, 26, etc. constitute a backwashing mechanism.

Further, as a detector for detecting clogging of the filter 120, it is also possible to detect clogging by detecting the flow velocity of the drain port.

The treated water containing flocs, which has been treated by the activated sludge method, rotary aeration method, neutralization of pickling wastewater, etc., flows through the inflow pipe 3, flows into the inflow chamber 4 from the inflow port 2, and flows over the inflow. The water overflows the flow weir 5 and flows quietly into the settling chamber 1, where large flocs are settled.

The supernatant liquid of the treated water in which the flocs have precipitated overflows the outflow overflow weir 6 and flows into the outflow chamber 7, and is transferred to the filtration chamber 1 through the communication pipe 11.
Flows into 0.

In the settling chamber 1, the partition walls 8 and 9 prevent water containing flocs from directly short-circuiting and flowing from the inlet overflow weir 5 to the outflow overflow weir.

The treated water that has flowed into the filtration chamber 10 contains minute flocs, and these minute flocs are filtered by the filter 12, and the treated water from which the minute flocs have been removed is drained into the drain pipe 13,
It flows into the pump well 19 through the valve 17 and the drain pipe 18.

Normally, the valve 23 is closed and the valve 26 is open, so the treated water from the pump well 19 from which minute flocs have been removed is passed through the communication pipes 21, 25, the valve 26, and the discharge pipe 27 by the pump 20 as appropriate. It is released into the river.

When the filter 12 becomes clogged, the treated water in the filtration chamber 10 is blocked from flowing out, so when the water level in the filtration chamber 10 rises and reaches a certain level, the level meter 14 detects it, and the detection signal , valve 23 is opened and valves 17 and 26 are closed.

Therefore, the treated water sent out by the pump 20 is also sent to the communication pipe 2.
1, 22, the valve 23, and the drain pipe 13 through the communication pipe 24.
flows back into the filtration chamber 10 from the filter 12.

For this reason, the filter 12 is washed (backwashed) by the reverse □ flow.

The treated water in the filtration chamber 10 is returned to the raw water tank through the auxiliary drain pipe 16.

After a certain period of time from the signal from the level meter 14, the valves 17, 26 are switched by a timer or the like.
is opened, the valve 23 is closed, and the treated water is discharged through the normal passage.

As described above, in the present invention, since micro flocs are filtered by the filter, the removal rate of BOD etc. is improved, and since the long residence time required to precipitate the micro flocs is not required, the device becomes compact and the precipitation chamber and filtration chamber are separated. As a result, large flocs are precipitated and only minute flocs flow into the filtration chamber, resulting in less clogging of the filter, and when the filter is clogged, it is backwashed to remove the clog and ensure good treatment. .

[Brief explanation of the drawing]

The figures are all explanatory cross-sectional views showing one embodiment of the present invention, with FIG. 1 showing the normal case and FIG. 2 showing the case during backwashing. 1...Sedimentation chamber, 2...Inlet, 6...
... Outflow overflow weir, 10 ... Filtration chamber, 12.
... Filter (drain port), 13 ... Drain pipe, 14 ... Level meter, 15 ... Auxiliary drain port, 16 ... Auxiliary Drain pipe, 17,23゜2
5... Valve, 19... Pump well, 2
0...Pump.

Claims (1)

[Scope of Claims] 1. A settling chamber having an inlet and an outflow overflow base, a drainage port communicating with the outlet side of the outflow overflow base and having a filter, and an auxiliary drainage port through which treated water flows out under certain conditions. and a filtration chamber having a detector for detecting clogging of the filter, and a backwashing mechanism for the filter that is activated by a detection signal from the detector. 2. The sedimentation tank with a filter according to claim 1, which uses a level meter as a detector to detect a water level at a certain height. 3. The sedimentation tank with a filter according to claim 1, which is configured to detect clogging of the filter by detecting the flow velocity of the drain port as a detector. 4. According to claim 1, 2 or 3, the sedimentation tank with a filter is provided with an auxiliary drain at a certain height higher than the normal water level. 5. The sedimentation tank with a filter according to claim 1, 2 or 3, wherein a valve is provided at the auxiliary drain port, and the valve is open while the backwash mechanism is in operation. 6. In claim 1, 2, 3, 4, or 5, the backwashing mechanism is configured such that the filter connects the drain pipe to the pump well via the valve 17, and the pump provided in the pump well is connected to the filter via the valve 23 via the communicating pipe. A sedimentation tank with a filter, which is connected to the drain pipe, and the pump is opened to the discharge area through a valve 26 through a communication pipe, and these valves are controlled by a detection signal.