JPH0629690U - Organic wastewater treatment equipment - Google Patents

Abstract

(57) [Abstract] [Purpose] By installing a filtering member in the treatment tank and directly obtaining clear treated water, the installation area of the equipment can be reduced and the treatment time can be shortened. (EN) Provided is an organic wastewater treatment device capable of preventing clogging of a filtering member and being capable of long-term operation due to its easy operability. [Structure] A plurality of filter members are installed in a processing tank, and each filter member is connected with a shutoff valve that opens and closes by the pressure of the backwash fluid, and one multi-point switch that switches the flow path of the backwash fluid. An organic wastewater treatment device with a valve connected.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an organic wastewater treatment apparatus for treating organic wastewater such as sewage and night soil.

[0002]

[Prior art]

 As a conventional device for treating organic wastewater, an activated sludge treatment device is generally widely used. In this system, the water to be treated is introduced into the biological reaction tank, and air is blown from the porous diffuser to aerate it, thereby biologically treating the contained organic matter with aerobic microbes. Also, there is a device for adding powdered activated carbon to the biological reaction tank for processing.

The treated water after the biological treatment is introduced into a settling tank and separated into sludge, powdered activated carbon and the like and treated water, and then a part of the sludge is returned to the biological reaction tank, and the treated water remains as it is. It is discharged or is highly treated by a sand filter device or activated carbon treatment device before it is reused.

Recently, sludge and treated water are separated by a filtration membrane separator instead of the above-mentioned settling tank, or a porous filter member is installed in the biological reaction tank to directly separate treated water. A collecting device is also used.

In the above-mentioned apparatus, in the apparatus for solid-liquid separation in the settling tank, the sludge settling speed is slow, so the installation area of the settling tank is extremely large, and the sludge concentration is low, so the sludge is transferred to the biological reaction tank Even if the sludge is returned, there is a problem that the sludge concentration in the biological reaction tank cannot be increased to a high load.

In addition, in a treatment device equipped with a filtration membrane separation device, slime such as organic substances and microorganisms adheres to the membrane surface to cause clogging, and the liquid permeation rate tends to decrease. It has become necessary to clean the membrane surface by physical cleaning.

Further, in a treatment apparatus having a filter member installed in a biological reaction tank, there is a device for exposing the filter member to air blown from an air diffuser to prevent clogging due to surface contamination. It has only the effect of slightly delaying clogging, and the frequency of cleaning with cleaning agents is still increasing.

Further, in the above, a device which doubles the filtering member as an air diffusing device and repeats diffusing and filtering at regular time intervals to backwash the filtering member is also disclosed in Japanese Patent Laid-Open No. 4-171094. However, since the filtration process and the aeration process are separate processes, the number of valves used is large, and this leads to complicated control or complicated control devices such as sequence control. It becomes necessary to use it.

In addition, in the device for further treating COD and color components by the activated carbon treatment device to highly treat the treated water obtained by sedimentation and separation of sludge in the settling tank, the activated carbon treatment device uses powdered activated carbon in a fluidized state. However, there is a problem that a precipitation tank for separating activated carbon and treated water is required.

[0010]

[Problems to be solved by the device]

 The present invention is an apparatus for treating organic wastewater, in which a plurality of filtration members are installed in the biological reaction tank, so that clear treated water can be obtained directly and the sludge concentration in the biological treatment tank can be kept high. It is a processing device that can be operated with a high volume load, can perform efficient processing, can reduce the installation area of equipment, and can shorten the processing time. This is a processing device that directly separates powdered activated carbon by installing multiple filtration members in the activated carbon treatment tank.With these treatment devices, the device configuration is simple and the filtration members can be prevented from clogging by easy operation. The purpose was to provide a device that enables long-term operation.

[0011]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the present invention provides a plurality of filtration members in a treatment tank for treating organic wastewater, and connects each of the filtration members with a shutoff valve which is opened and closed by the pressure of backwash fluid. The organic wastewater treatment apparatus is characterized in that one multipoint switching valve for switching the flow path of the backwashing fluid is connected.

[0012]

[Action]

 The water to be treated introduced into the biological reaction tank is kept aerobic by the air blown from the air diffuser and biologically treated by microorganisms. In addition, multiple filtration members installed in the biological reaction tank separate sludge and clear treated water to maintain a high sludge concentration in the biological reaction tank for efficient treatment and clear treatment. You can get water directly. Further, in a powder activated carbon treatment tank for advanced treatment, powder activated carbon having COD, color components, etc. adsorbed thereon can be directly filtered to obtain highly treated water by being filtered by a plurality of filtration members installed in the tank.

The plurality of filtration members are switched between a filtration state and a backwash state through a multipoint switching valve that switches the flow path of the backwash fluid, and these are switched at appropriate time intervals. That is, the filtering member connected to the pipe communicating with the backwashing fluid supply pipe in the multipoint switching valve is in the backwashing state, and the other filtering members are maintained in the filtering state.

In the filtration state, since the backwash fluid supply to the back pressure chamber of the shutoff valve is stopped by the multipoint switching valve, the pressure on the filtrate chamber side facing the head of the valve body becomes dominant, The filtration operation is continued by pushing up the valve element to open the treated water discharge pipe and discharging the treated water from the discharge pipe to the outside of the system.

Further, in the backwashing state, since the backwashing fluid of the shutoff valve is supplied through the multipoint switching valve, the pressure on the backpressure chamber side becomes superior to the pressure on the filtrate chamber side, The valve body is pushed down to close the discharge pipe, the discharge of the treated water is stopped, and the backwashing fluid is supplied to the filtering member to perform the backwashing operation.

As described above, since the filtration member is repeatedly filtered and backwashed at appropriate time intervals, clogging of the filtration member is prevented, the filtration operation is continuously performed for a long time, and the backwashing fluid itself is Since the shut-off valve is opened and closed by the pressure of one's body, no complicated control device or complicated operation is required.

[0017]

【Example】

 An embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a system diagram of an embodiment of the present invention. In FIG. 1, 1 is an organic wastewater introduced, and air is blown by an air diffuser (not shown) for biological treatment by aerobic microorganisms. It is a treatment tank such as a biological reaction tank or a powder activated carbon treatment tank provided for advanced treatment, and a plurality of filtration members 2 are installed inside. Powdered activated carbon may be added to the biological treatment tank.

Reference numeral 2 denotes a porous body made of a material such as ceramic, plastic or metal, or a filtration member formed by covering the surface of the porous body with a microfiltration membrane as a support carrier and having a cylindrical shape. It may be in a flat plate shape or the like, but a cylindrical porous ceramic body is preferable. The pore size of the porous body is preferably 0.05 to 1.0 micron when separating the bioactive sludge in the bioreactor, and is preferably about 10 to 100 micron when separating the powdered activated carbon. Further, the plurality of filtering members 2 may be provided as a single filtering member 21, 22, 23, 24, but may be provided as a plurality of groups as one block.

3a and 3b are shutoff valves connected to the respective filtration members 2 for controlling the discharge of treated water and switching between filtration and backwashing in the filtration member 2, and 3a is closed by the pressure of the backwashing fluid. In the valve-opened state, and 3b shows the valve-opened state by the pressure of the treated water, and FIG. 2 shows a specific example of the shutoff valve 30. The shutoff valve 30 is mainly composed of a cylinder 31 and a valve body 32 which is supported by a support member 33 and moves along the inner side wall of the cylinder 31, and the inside of the cylinder is formed by a valve body head 34 provided at the upper end of the valve body 32. , A back pressure chamber 35 in the upper part and a filtrate chamber 36 in the lower part.

Further, a backwash fluid supply pipe 41 is connected to the upper back pressure chamber 35, and a filtrate water supply pipe 42, which is treated water, and a treated water discharge pipe 43 are connected to the filtrate chamber 36. In addition, it is preferable to provide a strainer 44 for removing solids at the inlet of the filtrate chamber 36 from the water supply pipe 42 in order to prevent the valve body 32 from closing improperly.

In the valve closing operation by the shutoff valve 30, when the backwashing fluid is introduced from the supply pipe 41 into the back pressure chamber 35, the pressure pushes the valve body head 34 to push down the entire valve body 32. The discharge pipe 43 of the treated water is closed by the valve portion 37 provided at the lower end. As a result, the discharge of the treated water is stopped and the backwashing fluid is supplied to the filtering member 24 to backwash the filtering member 24.

Further, in the valve opening operation, by stopping the supply of the backwash fluid to the back pressure chamber 35, the pressure on the treated water side accumulated in the filtrate chamber 36 from the water supply pipe 42 communicating with the filtering member 2 , The valve head 34 is pushed, the whole valve body 32 is pushed up, the treated water discharge pipe 43 is opened, the treated water is discharged from the discharge pipe 43, and the filtration members 21, 22, 23 filter the treated water. Is done.

The operation of supplying and stopping the backwashing fluid is performed by the multipoint switching valve 5, and FIG. 3 shows a rotary valve 50 as an example. The rotary valve 50 has an outer cylinder 51 and a outer cylinder 51, each of which has a backwash fluid supply port 53 that is opened by the number of connections with the filtration member 2 and has a backwash fluid inlet port 56 at the bottom. An inner cylinder 52 having a single opening 54 bored therein and fitted so that the inner wall and the outer periphery of the inner cylinder come into contact with each other and rotate, and a drive unit 55 including a motor and a speed reducer for rotating the inner cylinder 52. However, the multipoint switching valve 5 is not limited to this.

The backwash fluid is supplied at the time of backwashing so as to connect the opening 54 of the inner cylinder 52 to the supply port 53 of the outer cylinder 51 connected to the filtering member 2 for supplying the backwash fluid. The backwashing fluid can be supplied to the shutoff valve 4 and the backwashing target filtering member 2 by rotating the backwashing fluid. Air, treated water, or the like is used as the backwashing fluid.

[0025]

[Effect of device]

 According to the organic wastewater treatment apparatus of the present invention, the following effects can be obtained. B) By installing a filter member in the biological reaction tank, sludge and powdered activated carbon can be directly separated from the treated water in the tank, so that clear treated water can be obtained directly and in the biological reaction tank. Since it is possible to maintain a high sludge concentration and operate with a high volume load, it is possible to reduce the installation area of equipment and the processing time. (B) Since the filtration and backwashing operations are performed by the pressure of the backwashing fluid itself by operating one multi-point switching valve, the device is simplified and clogging of the filtering member is facilitated with extremely easy operation. It was possible to prevent this and to enable long-term operation.

[Brief description of drawings]

FIG. 1 is a system diagram of an organic wastewater treatment apparatus according to an embodiment of the present invention.

FIG. 2 is a sectional view of an example of a shutoff valve.

FIG. 3 is an elevation view of an example of a flow path switching valve.

FIG. 4 is an AA view of FIG.

[Explanation of symbols]

1: treatment tank, 2: filtering member, 3a, 3b: shutoff valve, 5:
Multi-point switching valve, 21, 22, 23: Filtration member during filtration, 24: Filtration member during backwash, 30: Shutoff valve, 31: Cylinder, 32: Valve body, 33: Support member, 34: Valve body head , 35: back pressure chamber, 36: filtrate chamber, 37: valve part, 41:
Supply pipe, 42: Water supply pipe, 43: Discharge pipe, 44: Storage
50: rotary valve, 51: outer cylinder, 52: inner cylinder,
53: supply port, 54: opening, 55: drive device, 56:
Backwash fluid inlet.

Claims (1)

[Scope of utility model registration request] 1. A plurality of filter members are installed in a treatment tank for treating organic wastewater, and shutoff valves that are opened and closed by the pressure of the backwash fluid are connected to the respective filter members, and the flow of the backwash fluid flows. An organic wastewater treatment device, which is connected to one multipoint switching valve for switching the path.