JPH08913A - Sludge waste water treatment apparatus - Google Patents

Abstract

PURPOSE:To provide a sludge waste water treatment apparatus preventing that the water channel due to a supernatant liquid is formed to a settled sludge bed and settled sludge is stagnated on the bottom of a sedimentation tank as it is and capable of drawing out settled sludge efficiently and continuously while discharging a supernatant liquid. CONSTITUTION:Drain pipes 101, 201 for discharging settled sludge formed by arranging perforated pipes having drain holes provided thereto in a dispersed state are provided to the flat bottom parts of sedimentation tanks 1, 2 performing the sedimentation treatment of sludge of waste water, and the sedimentation tanks 1, 2 and the drain pipes 101, 201 are all connected by a circulation route provided with a pump 15.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for treating sludge wastewater generated in factories and the like, particularly filter cloth washing wastewater dehydrated by a dehydrator.

[0002]

2. Description of the Related Art Conventionally, sludge wastewater obtained by an activated sludge treatment method of factory wastewater is dehydrated by a belt press type dehydrator, filtered water is discharged by discharge, and sludge content is incinerated by a rotary kiln. The filter cloth used in the above dehydrator has a sludge content left unscraped and therefore needs to be washed with water. However, since the cleaning wastewater of the filter cloth used for this water washing contains a large amount of suspended substances, it cannot be discharged as it is.

[0003] Therefore, by utilizing the fact that sludge sedimentation is fast, a general-purpose flat-bottomed tank is used as a sedimentation tank, sludge is sedimented by sedimentation and separated from water, and the supernatant liquid is discharged and sludge is separated. A sludge wastewater treatment device is used which is adapted to withdraw from a bottom of a settling tank by a head using a ball valve and to be dehydrated again to perform a second settling process.

With respect to devices other than the above-mentioned sludge wastewater treatment device, for example, Japanese Unexamined Patent Publication (Kokai) No. 63-16094 discloses a device for extracting excess sludge used in a small-scale sewage / wastewater treatment plant.

[0005]

However, in the former sludge wastewater treatment device, the sludge component settling on the flat bottom of the settling tank is frequently used, and when it is used for a long period of time, it becomes a sludge layer. There is a problem that not only the supernatant liquid but also the passage for the air can be formed, and the sludge can be accumulated without being completely extracted.

Further, the latter device for removing excess sludge described in JP-A-63-16094 is effective for treating small-scale wastewater, but is not suitable for large-scale treatment in factories and the like. There is such a problem.

The present invention has been made by paying attention to the above problems, and the purpose thereof is to eliminate these problems and to form a water path in the settling sludge layer by the supernatant liquid. It is an object of the present invention to provide a sludge wastewater treatment device capable of preventing the settled sludge from staying at the bottom of the settling tank, efficiently and continuously extracting the settled sludge, and discharging the supernatant.

[0008]

In the sludge wastewater treatment apparatus of the present invention, a perforated pipe having a drainage hole for discharging the settled sludge is provided in a flat bottom of a settling tank for treating the sludge of the wastewater. A drainage pipe for disposing the settled sludge is installed.
The settling tank and the drainage pipe are connected by a circulation path via a pump.

The drainage pipe in the sludge wastewater treatment apparatus of the present invention is a synthetic resin pipe having a drainage hole, for example, a perforated pipe made of a vinyl chloride resin pipe, and the drainage hole is directed downward to a settling tank. It is arranged almost evenly on a flat flat bottom.

[0010]

In the sludge wastewater treatment apparatus of the present invention, in order to efficiently stir and discharge the settled sludge at the flat bottom of the settling tank, the drainage pipes in which the perforated pipes having the drainage holes are dispersed are provided. As a result of this, it is possible to prevent the sediment sludge layer from forming a water path in the sediment sludge layer and prevent the sediment sludge from staying at the bottom of the sedimentation tank, efficiently and continuously extracting the sludge component and discharging the supernatant liquid. be able to.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a flow chart of the entire apparatus showing an example of the sludge wastewater treatment apparatus of the present invention. In FIG. 1, reference numeral 1 denotes a first precipitation tank provided above, and a drain pipe 101 is provided at a flat bottom portion of the first precipitation tank 1. A second precipitation tank 2 is provided below the first precipitation tank 1, and a drain pipe 201 is provided at the flat bottom portion of the second precipitation tank 2. Reference numeral 3 denotes a dehydrator, and a filter cloth washing wastewater tank 4 is provided below the dehydrator 3.

The dewatering machine 3 is operated to drive the filter cloth cleaning waste water stored in the filter cloth cleaning waste water tank 4 into the first settling tank 1.
A submersible pump 5 is provided between the filter cloth washing wastewater tank 4 and the first settling tank 1 for the purpose of feeding it to the pipe.

When the filter cloth washing wastewater fed to the first settling tank 1 by the submersible pump 5 becomes full, the overflowing filter cloth washing wastewater is sent to the second settling tank 2 from the pipe 1a by overflow.

Thereafter, the operation of the dehydrator 3 is stopped, and the valves 6, 7, 8 and 9, valve 10,
The valve 11 is opened, and the heads of the first settling tank 1 and the second settling tank 2 are used to extract air from the pipe 10a and the pipe 11a by the pump 15.

In this state, the sludge in the wastewater of the first settling tank 1 and the second settling tank 2 is settled for about 3 hours. After a lapse of about 3 hours, the valves 12 and 13 of the first precipitation tank 1 and the second precipitation tank 2 are opened and the supernatant liquid is discharged to the side groove 14 for processing. And the valve 13 is closed.

Next, the valves 6 and 7 are closed, the pump 15 is operated, and after about 2 minutes, it is opened.
Initial stirring of the settled sludge in the first settling tank 1 is performed. Subsequent to this, the valve 6 is closed, and the pump 15 is operated to circulate and agitate the settled sludge in the first settling tank 1 through the drain pipe 101 via the pipes 6a, 7a, and 10a. At the same time, the settling sludge in the first settling tank 1 is transported to the second settling tank 2 via the pipe 8a.

The circulation and agitation of the settled sludge in the first settling tank 1 described above is performed by the drain pipe 101 provided at the flat bottom of the first settling tank 1.
Since the perforated pipes having the drainage holes formed downward are dispersedly arranged in the drainage pipe 101, the sludge accumulated at the bottom of the tank is agitated and Roads can be prevented from occurring.

Subsequently, when the operation of the pump 15 is stopped by the operation of the pressure switch 16, the valve 10
And the valve 8 is closed. Pressure switch 1 above
Reference numeral 6 is provided to prevent the pump from running dry, and when the settled sludge is reduced and the pressure drops, the pressure is sensed and the pump operation is automatically stopped.

Next, the valve 17 and the valve 6 are opened, industrial water is sent to the first settling tank 1 through the pipe 6a, and the first settling tank 1 is washed for about 1 minute and washed. The valve 17, the valve 6, and the valve 7 are closed at the time when the process ends. In this state, the filter cloth washing wastewater can be newly fed to the first settling tank 1.

Next, the valves 8 and 9 are opened, the pump 15 is operated, the sludge in the second settling tank 2 is initially stirred via the pipes 8a and 9a, and closed after about 2 minutes. To be

Following this, the valve 18b is opened,
By the operation of the pump 15, circulation and agitation of the settled sludge in the second settling tank 2 is performed through the drain pipe 201, and at the same time, the transport of the settled sludge in the second settling tank 2 is performed via the pipe 18a. Is fed to the dehydrator 3 and re-dehydrated. The effect of the drainage pipe 201 is similar to that in the first settling tank.

Subsequently, when the operation of the pump 15 is stopped by the operation of the pressure switch 16, the valve 11
Is closed.

Thereafter, the valves 6 and 8 are opened to wash the second precipitation tank 2 with industrial water, and the valves 6 and 8 are closed when the washing for about 1 minute is completed.

In this processing step, the valve 18, the valve 19 and the valve 20 are always opened, and the first settling tank 1,
The valves 23 and 24 provided at the bottom of the second precipitation tank 2 are always closed except for the drain drain.
Further, 21 is a valve provided for adjusting the flow rate, and 22
Is a valve that opens when air is blown in.

As described above, one cycle of sludge treatment of the filter cloth washing wastewater by the sludge wastewater treatment apparatus of the present invention is completed.

FIG. 2 is a plan view showing an example of a drainage section of the sludge wastewater treatment apparatus of the present invention, and FIG. 3 is an enlarged rear view of section A of FIG. 2 and 3, 30 is a side wall of the first precipitation tank 1 or the second precipitation tank 2, and 31 is a flat flat bottom.

Reference numeral 40 is a drainage pipe provided at the flat bottom,
The drain pipe 40 includes a main pipe 41 provided at the center,
Perforated pipes 42, 42a, 42c, and 43, which are branched from the main pipe 41 on both sides and arranged alternately in a staggered manner,
.. 43d.

Although the number of the perforated pipes is not limited, it is preferable that the left and right pipes are provided in the same number in order to efficiently discharge the settled sludge. Further, as shown in FIG. 3, drainage holes 44 are bored on the back side of the perforated pipes 42, 42a, 42c and 43, 43a, 43d so that the settled sludge is drained. ing.

Reference numeral 32 denotes a water supply port through which the settled sludge described above is supplied. Three
Denoted at 3 is a drain port, and this drain port 33 is connected to the first settling tank 1 by a pump 15 in the case of the first settling tank 1, and in the case of the second settling tank, the pump 15 makes the dehydrator. Three
Settled sludge is now being delivered to.

Reference numeral 50 is a support for the drain pipe 40, and the height of the upper surface of the support 50 up to the position where it abuts the main pipe 41 is about 50 mm. The main pipe 41 is supported by the fastening band 51. It is fastened and fixed to 50.

In FIG. 3, a vinyl chloride resin pipe is used for the main pipe 41 and the perforated pipe 42b in this embodiment.
The perforated pipe 42b is inserted into a connection branch 41a provided so as to protrude from the main pipe 41 at a substantially right angle, and is fixed by an adhesive material.

The outer diameter of the perforated pipe 42b is preferably about 50 to 70 mm, and the diameter of the drain holes formed at appropriate intervals is 12 mm in this embodiment. A range of 8 to 15 mm is preferably used.

[0033]

According to the sludge wastewater treatment apparatus of the present invention,
In order to efficiently stir and discharge the settled sludge at the flat bottom of the settling tank, a drainage pipe with dispersed perforated pipes with drainage holes is provided, so that the sedimented sludge layer can be treated by the supernatant liquid. As a result, it is possible to prevent the settled sludge from staying at the bottom of the settling tank, efficiently and continuously withdraw sludge, and to discharge the supernatant liquid. Therefore, it is suitable as a sludge wastewater treatment device.

[Brief description of drawings]

FIG. 1 is a flowchart of the entire apparatus showing an example of a sludge wastewater treatment apparatus of the present invention.

FIG. 2 is a plan view showing an example of a drainage pipe of the sludge wastewater treatment device of the present invention.

FIG. 3 is an enlarged back view of a portion A of FIG.

[Explanation of symbols]

1 1st settling tank 2 2nd settling tank 101, 201 Drain pipe 3 Dehydrator 4 Filter cloth washing waste water tank 5 Submersible pump 6, 7, 8, 9, 10, 11, 12, 13, 17, 1
8, 19, 20, 21 22 Valve 14 Gutter 15 Pump 16 Pressure switch 30 Side wall 31 Flat bottom 32 Water inlet 33 Drainage port 40 Drain pipe 41 Main pipe 42, 43 Perforated pipe 50 Support base 51 Fastening band

Claims (1)

[Claims] 1. A drainage pipe for discharging settling sludge, in which perforated pipes having drainage holes for discharging settling sludge are dispersedly arranged in a flat bottom of a settling tank for treating sludge of wastewater. The
A sludge wastewater treatment device, wherein the settling tank and the drainage pipe are connected by a circulation path via a pump.