JP2002326097A - Waste water treatment equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide waste water treatment equipment having great flexibility toward the change of the amount of waste water treatment and high treatment reliability. SOLUTION: In the preceding stage of a biological treatment part 2 which biologically decomposes and removes the pollution components of the waste water supplied from a waste water feeding part 1, a physical treatment part 3 which physically separates and removes the pollution components is provided. The waste water feeding part 1 and the biological treatment part 2 are connected with a physical treatment by-pass line 4 to make it also possible to treat waste water only with the biological treatment part 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a wastewater treatment device.

[0002]

2. Description of the Related Art For example, in order to treat aquatic breeding wastewater from an aquaculture pond, a physical treatment method for physically separating pollutants in the wastewater using foam or the like, or a biological reaction has conventionally been used. A wastewater treatment apparatus using a biological treatment method that decomposes polluting components is used, and any of these is incorporated in the apparatus.

[0003]

However, since the above-mentioned physical treatment method removes polluted components by physical treatment, although the treatment capacity is high, the polluted components can be physically separated in wastewater. It is effective only when it is present in an undissolved state, and the processing performance when it is in a dissolved state is hardly perfect.

[0004] On the other hand, the biological treatment method is capable of decomposing irrespective of the state of the pollutant component if the contaminant component can be decomposed by a biological reaction, but the treatment capacity is inferior to the physical treatment method. In addition, since the supply of the pollutant component also has the aspect of feeding for maintaining the biological treatment section, there is a problem that it is necessary to always supply the minimum amount of the organic substance of the pollutant component to maintain the biological reaction.

[0005] For this reason, the conventional wastewater treatment apparatus employing either one of these treatment methods has a drawback that the flexibility with respect to the change in the amount of wastewater treatment is remarkably lacking.

The present invention has been made in order to solve the above-mentioned drawbacks, and has high flexibility in changing the amount of wastewater treatment.
Further, it is an object of the present invention to provide a wastewater treatment device having high treatment reliability.

[0007]

SUMMARY OF THE INVENTION According to the present invention, it is an object of the present invention to provide a biological treatment unit 2 for biologically decomposing and removing pollutant components of wastewater supplied from a wastewater supply unit 1. Wastewater treatment, which comprises a physical treatment unit 3 for separating and removing the wastewater, and the wastewater supply unit 1 and the biological treatment unit 2 are connected by a physical treatment bypass pipe 4 to enable wastewater treatment only by the biological treatment unit 2 This is achieved by providing a device.

[0008] The wastewater treatment apparatus is configured by disposing a physical treatment unit 3 in front of the biological treatment unit 2. In a normal state, wastewater is first treated in the physical treatment unit 3, and then the final treatment is performed in the biological treatment unit 2. Done. The wastewater supply route to the biological treatment unit 2 includes a direct route from the wastewater supply unit 1 in addition to the route via the physical treatment unit 3. By selecting these supply routes, the wastewater treatment process can be performed. Can be changed.

Therefore, in the present invention, when the amount of wastewater treatment is large, the physical treatment bypass pipe 4 is closed, and the wastewater subjected to the preliminary treatment by the physical treatment unit 3 is supplied to the biological treatment unit 2 for final treatment. Processing is performed. In contrast,
When the amount of wastewater treatment is small, the physical treatment bypass pipe 4
, And wastewater can be supplied directly from the wastewater supply unit 1 to the biological treatment unit 2 for treatment.

As a result, even if the wastewater treatment amount fluctuates, almost the same amount of polluting components can always be supplied to the biological treatment unit 2 without damaging the biological treatment unit 2.
Wastewater treatment can be performed.

Further, the wastewater treatment apparatus is provided with a physical treatment for physically separating and removing the polluted components before a biological treatment unit 2 for biologically decomposing and removing the polluted components of the wastewater supplied from the wastewater supply unit 1. A physical processing unit 3
A biological treatment bypass pipe 5 that bypasses the biological treatment unit 2 is connected to the output unit from, and can be configured to enable wastewater treatment only by the physical treatment unit 3.

In this case, when a large amount of wastewater is supplied to the wastewater supply unit 1 and the treatment by the physical treatment unit 3 alone is sufficient, the physical treatment is performed while supplying the wastewater to the biological treatment unit 2 to a necessary limit. The processing can be performed only by the unit 3.

The opening and closing of the physical treatment bypass pipe 4 or the biological treatment bypass pipe 5 can be manually switched based on the amount of wastewater supplied to the wastewater supply unit 1 or the properties of the wastewater. The amount of the wastewater or the quality of the wastewater can be detected by an appropriate detection means, and the control unit 6 operating based on the output of the detection means can perform an automatic operation. The opening and closing of the bypass pipe does not necessarily have to be of two types, “disconnected” and “connected”, and an intermediate state between them, that is, both the main pipe and the bypass pipes 4 and 5 regulate the flow rate of each other. It also includes the case of opening while
By opening and closing the inlets of the bypass pipes 4 and 5 in chronological order, and adjusting the opening time, the amount of inflow into the bypass pipes 4 and 5 can also be adjusted.

When the wastewater supply unit 1 is configured as a reservoir capable of storing a predetermined amount of wastewater, the reservoir can be used as a quantitative buffer, and the wastewater is supplied from a blower in the reservoir. The quality of the wastewater to be treated can be improved because it is agitated by the air that is to be treated.In addition to monitoring the change in the water level of the reservoir, the inflow of the wastewater and the set treatment capacity You can easily know the balance with. Therefore, the pollutant component can be qualitatively or quantitatively estimated from the water quality measurement result, and can be used as a reference index for opening and closing the bypass pipe.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows an embodiment of the present invention configured as a device for treating aquatic breeding wastewater generated from a pond or the like. In this embodiment, a wastewater treatment apparatus includes a wastewater supply unit 1, a physical treatment unit 3 that separates and removes pollutants in wastewater by a foam separation method, a biological treatment unit 2,
The wastewater supply unit 1, the physical treatment unit 3, the biological treatment unit 2, and the discharge unit 7 are connected by a main pipeline 8. The main pipeline 8 includes a first main pipeline 8A connecting the wastewater supply unit 1 and the physical processing unit 3, a second main pipeline 8B connecting the physical processing unit 3 and the biological processing unit 2, a physical processing unit 3 and a discharge unit 7.
The first main line 8A and the second main line 8B are connected by the physical processing bypass line 4, and the second main line 8B and the third main line 8C are connected by the biological processing bypass line. Directly connected by road 5.

At the base ends of the physical treatment bypass pipe 4 and the biological treatment bypass pipe 5, a physical treatment bypass control valve 9 and a biological treatment bypass control valve 10 are disposed, respectively.
Further, a control unit 6 for controlling these control valves 9 and 10 is provided.
Is arranged. Wastewater from the physical treatment unit 3 is transferred to the biological treatment unit 2
The biological treatment bypass control valve 10 is disposed downstream of a connection point between the physical treatment bypass pipe 4 and the second main pipe 8B so that the biological treatment bypass control valve 10 can be guided to the discharge section 7 without passing through the water.

Therefore, in this embodiment, the wastewater from the wastewater supply unit 1 is treated in both the physical treatment unit 3 and the biological treatment unit 2 and discharged to the discharge unit 7 by adjusting the control valves 9 and 10. In addition to the above, it is possible to select processing only in the biological processing unit 2 by passing through the physical processing bypass pipe 4 or processing only in the physical processing unit 3 through the biological processing bypass pipe 5. .

As shown in FIG. 2, the wastewater supply unit 1 has a reservoir 1a whose storage amount is controlled by a liquid level gauge 11.
In the reservoir 1a, wastewater to be treated and recovered wastewater from a foam separation tank 3a described later are supplied and stored. The wastewater in the reservoir 1a is agitated by the agitating bubbles supplied from the blower 12, so that the sedimentation of the polluted components to the bottom of the reservoir 1a is prevented. 8A. A flowmeter (not shown) is attached to the measuring tank 1b. When the amount of wastewater supplied to the first main line 8A is larger than a set amount, the flow is returned to the reservoir 1a via the return line 14, The amount of wastewater supplied to the first main line 8A is kept constant.

A check valve 15 for preventing back flow to the measuring tank 1b and first and second valves 9a and 9b constituting a physical treatment bypass control valve 9 are mounted on the main line 8. By switching the second valves 9a and 9b, the wastewater from the measuring tank 1b can be selectively guided to the physical treatment bypass pipe 4 or the first main pipe 8A.

In FIG. 2 and subsequent figures, the flow direction of the treated wastewater is indicated by a white arrow, the flow direction of the wastewater and information is indicated by a black triangular arrowhead, and the connection destination of the apparatus which does not consider the flow direction of the wastewater and information is shown. Is indicated by a normal arrow. For example, in FIG.
An arrow drawn from the physical processing unit 3 indicates that the connection destination to the reservoir 1a is the physical processing unit 3, and at the same time, indicates that the wastewater flows from the physical processing unit 3 to the reservoir 1a side.

As shown in FIG. 1, the physical processing section 3 includes an interface reforming tank 3b, a reforming aid adjusting section 3c for supplying a processing liquid to the interface reforming tank 3b, and a foam separation tank 3a. Have. As shown in FIG. 3, the reforming aid adjusting unit 3c includes a coagulant storage tank 3c1 for storing a coagulant such as polyaluminum chloride (PAC), a sodium hydroxide tank 3c3 connected to the dilution tank 3c2, A surfactant storage tank 3c5 to which the interfacial modifier dissolved by the diluted sodium hydroxide is supplied in the interfacial modifier dissolving tank 3c4 is supplied to the interfacial reforming tank 3b.

On the other hand, as shown in FIG. 4, wastewater is supplied to the interface reforming tank 3b of the physical treatment section 3 by being connected to the first main line 8A, and the foam adsorbing performance at the particle interface of the wastewater is improved. Be improved. Further, a pH meter 16 is provided in the interface reforming tank 3b, and the hydrogen ion concentration (pH) is kept constant by appropriately supplying diluted sodium hydroxide from the dilution tank 3c2. In FIG. 4, reference numeral 17 denotes an impeller for stirring the inside of the tank, and reference numeral 18 denotes a motor for driving the impeller.

As shown in FIG. 5, the foam separation tank 3a has a structure capable of realizing a flotation method for floating and removing pollutants from wastewater whose interface has been reformed by the interface reforming tank 3b. And a gas-liquid mixing device 19 and a schema 20. As shown in FIG. 5, as the gas-liquid mixing device 19,
A so-called self-contained gas-liquid mixing device that naturally sucks outside air through an intake pipe (not shown) using negative pressure on the blade back surface of the impeller 19b rotated by the motor 19a can be used.

The polluted components in the interface-modified wastewater, the interface modifier, and the like are adsorbed and concentrated on the microbubbles generated by the gas-liquid mixing device 19 and float on the water surface as hard-to-break bubbles (stable foams). , Schema 20.
After the removed pollutant components are transferred to the foam storage tank 21,
Appropriately disposed of as sludge.

As described above, the end of the physical processing bypass pipe 4 is connected to the second main pipe 8B connecting the physical processing section 3 and the biological processing section 2, and the second main pipe 8B is connected to the physical processing section 8B. The third and fourth valves 9c and 9d constituting the physical processing bypass control valve 9 are disposed upstream of the connection point of the bypass pipe 4.

The starting end of the biological treatment bypass line 5 is connected to the second main line 8B, and a biological treatment bypass control valve is provided downstream of the connection point between the second main line 8B and the physical treatment bypass line 4. Fifth and sixth valves 10 constituting 10
a and 10b are arranged.

As shown in FIG. 6, the biological treatment section 2 has a denitrification tank 2a, a membrane separation tank 2b, and an aeration tank 2c.
Wastewater is circulated through these tanks 2a, 2b and 2c while denitrification by the denitrifying bacteria in the denitrification tank 2a, and aeration tank 2c.
Of organic matter (BOD), nitrification of ammonia nitrogen, solid-liquid separation in the membrane separation tank 2b, and solid components (sludge) in the membrane separation tank 2b were stored in the sludge storage tank 2d. Thereafter, the excess is disposed of, and the liquid component is stored in the treated water tank 2f as treated wastewater, and then discharged to the third main line 8C. Each of these tanks 2a, 2b, 2c has a machine room 2e.
(Oxygen or the like) is supplied as appropriate, and the treated water in the treated water tank 2f is passed through an activated carbon adsorption tower 2g to measure the chemical oxygen demand (COD).

In addition, as shown in FIG.
A sterilization section 7a is provided, and the treated wastewater can be sterilized as needed. Sterilizer 7a
Can be configured by appropriate known means,
In the illustrated embodiment, the process is performed by supplying chlorine obtained by electrolyzing seawater with the electrolytic device 7b to the discharge water tank 7c.

As shown in FIG. 1, the control unit 6 is provided to control the above-described bypass control valves 9 and 10 in consideration of the amount of wastewater supplied to the wastewater supply unit 1 or the properties of the wastewater. In this embodiment, the control unit 6 includes a water quality input unit 6a ′ from a water quality inspection sensor 6a provided in the wastewater supply unit 1 and an inflow amount input unit 6b ′ from the inflow amount sensor 6b to the wastewater supply unit 1. And a water level input unit 6c 'from the water level measurement sensor 6c of the biological processing unit 2, and a calculation unit 6d.

If the output from the inflow rate sensor 6b is equal to or less than the specified value calculated based on the processing capacity of the biological processing unit 2, the control unit 6 sets the first to fourth valves 9a.
Output the opening / closing command to ~ 9d to output the physical processing bypass line 4
At the same time, the first main line 8A is closed, and at the same time, the operation signals of the fifth and sixth valves 10a and 10b are output to close the biological treatment bypass line 5, and the biological treatment unit 2 of the second main line 8B is closed. Open the entrance to As a result, all wastewater in the wastewater supply unit 1 is sent to the biological treatment unit 2 to be subjected to wastewater treatment.

On the other hand, when the output from the inflow rate sensor 6b is equal to or more than the specified value, first, the output from the water quality inspection sensor 6a is checked, and the water quality in the wastewater supply unit 1 is only the physical processing unit 3. If the processing can be performed by
d outputs an opening / closing command to the first to fourth valves 9a to 9d to close the physical processing bypass pipe 4, and
The fifth and sixth valves 10a and 10b are operated to open the biological treatment bypass line 5. As a result, the wastewater in the wastewater supply unit 1 is sent to the discharge unit 7 without being sent to the biological treatment unit 2 after being processed in the physical treatment unit 3. On the other hand, when the water level information in the biological treatment section 2 decreases to a predetermined value, the control section 6 opens the physical treatment bypass pipe 4 and closes the biological treatment bypass pipe 5 to send wastewater to the biological treatment section 2. By guiding, the required processing amount in the biological processing unit 2 is secured.

The water quality inspection sensor 6a is
If it is output that the treatment is difficult only by the biological treatment unit 2, the wastewater is guided to both the physical treatment unit 3 and the biological treatment unit 2 by closing both bypass pipes. The operation can be performed while reducing the burden of the processing by the physical processing unit 3.

In the above description, the control unit 6 is configured to automatically open and close the valve depending on the state of the wastewater. In addition, the seasonal fluctuation is statistically known in advance. In such a case, the valve may be opened and closed by a time table. In this case, the control unit 6 can be configured more simply.

[0034]

As is clear from the above description, according to the present invention, the flexibility in changing the wastewater treatment amount can be increased, and the treatment reliability can be increased.

[Brief description of the drawings]

FIG. 1 is a diagram showing the present invention.

FIG. 2 is a diagram illustrating a wastewater supply unit.

FIG. 3 is a diagram showing a reforming assistant adjusting unit.

FIG. 4 is a diagram showing an interface reforming tank.

FIG. 5 is a diagram showing a foam separation tank.

FIG. 6 is a diagram showing a biological processing unit.

FIG. 7 is a diagram showing a discharge section.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Wastewater supply part 2 Biological treatment part 3 Physical treatment part 4 Physical treatment bypass pipe 5 Biological treatment bypass pipe

Claims (3)

[Claims] 1. A biological treatment unit for biologically decomposing and removing pollutant components of wastewater supplied from a wastewater supply unit, and a physical treatment unit for physically separating and removing the pollutant components is provided before the biological treatment unit. A wastewater treatment system in which the supply unit and the biological treatment unit are connected by a physical treatment bypass pipe, and enables wastewater treatment only by the biological treatment unit. 2. A biological treatment section for biologically decomposing and removing pollutant components of wastewater supplied from a wastewater supply section, and a physical treatment section for physically separating and removing the pollutant components is provided before the biological treatment section. A wastewater treatment device that is connected to a biological treatment bypass pipe that bypasses the biological treatment unit to the output unit from the treatment unit, enabling wastewater treatment only by the physical treatment unit. 3. The wastewater supply unit is capable of storing a predetermined amount of wastewater. The wastewater supply unit opens and closes a physical treatment bypass pipe based on a result of a water quality test, so that the supply amount of the pollutant component to the biological treatment unit can be almost quantitatively determined. The wastewater treatment device according to claim 1 or 2, wherein