JP2883462B2 - Purification system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[Object of the Invention]

[0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a purification system using biological activated carbon for use in water purification plants and sewage treatment plants that require advanced water treatment.

[0003]

2. Description of the Related Art As a purification treatment system for performing advanced water treatment using biological activated carbon, a system shown in FIG. 3 is conventionally known.

[0004] The purification treatment system shown in this figure is provided with an ozone reaction tank device 101 and a biological activated carbon tank device 102, and when treated water 103 treated by a coagulation sedimentation tank or a sand filtration tank is supplied, To the ozone reactor 10
1, where the organic matter in the treated water 103 is decomposed,
After decoloring, deodorizing, and improving the biological treatment property, it is led to the biological activated carbon tank device 102, where it is retained for a certain period of time to be purified, and sent to the next processing step.

[0005] An ozone reaction tank apparatus 101 is provided with an inflow pipe 104 for taking in treated water 103 which has been treated in a coagulation settling tank or a sand filtration tank,
Ozone reaction tank 105 for storing treated water 103 taken in by the above, a diffuser tube 106 disposed at the lower side in the ozone reaction tank 105, and disposed outside the ozone reaction tank 105 to generate ozone. This is
Ozone generator 107 for generating ozone bubbles 109 in the treated water 103 in the ozone reaction tank 105
And an ozonated water pump 108 for taking in the treated water 103 in the ozone reaction tank 105 and sending it to the biological activated carbon tank device 102.

[0006] When the treated water 103 treated by the coagulation sedimentation tank or the sand filtration tank is supplied, the treated water 103 is guided to the ozone reaction tank 105 by the inflow pipe 104, supplied from the ozone generator 107, and discharged from the diffusion pipe 106. Ozone bubble 1
09 and countercurrent gas-liquid contact to decompose, decolor, and deodorize the organic matter in the treated water 103 by the oxidizing power of ozone, and improve the biological treatability of the organic matter. Treated water 10
3 to the biological activated carbon tank device 102.

The biological activated carbon tank device 102 includes a biological activated carbon tank 111 for storing the treated water 103 fed by the ozonated water pump 108, a support member 112 provided on a lower side in the biological activated carbon tank 111, A biological activated carbon 113 disposed in the activated carbon tank 111 and supported by the support member 112, and a treated water pump 114 for taking in the treated water 103 in the biological activated carbon tank 111 and sending it to the next treatment step.

When the ozone-treated water 103 is supplied from the ozone reaction tank apparatus 101, it is introduced into the biological activated carbon tank 111, and then the biological activated carbon 113 is supplied.
Then, the treated water 103 after the purification treatment is sent to the next treatment step by the treated water pump 114.

[0009]

However, in the conventional purification treatment system described above, the biological activated carbon tank 1 is used.
According to the structure of 11, the treated water 103 is
Is determined, and the contact time between the treated water 103 and the biologically active carbon 113 is determined by this. When the water temperature decreases and the biological activity of the biologically active carbon 113 decreases, the treated water quality Gets worse,
There was a problem that stable treated water quality could not be maintained.

The present invention has been made in view of the above circumstances, and even when the treatment temperature of biologically activated carbon changes due to a decrease in water temperature, the change is detected and the residence time in the biologically activated carbon portion is controlled to make the treated water quality constant. It is an object of the present invention to provide a purification system capable of maintaining the value at a value.

[Structure of the Invention]

[0012]

In order to achieve the above object, a purification treatment system according to the present invention comprises a plurality of biologically activated carbon tank devices for treating supplied treated water and sending the treated water to the next step. A water quality detection unit that detects a difference between the quality of the treated water supplied to the activated carbon tank device and the quality of the treated water sent to the next step, and based on the detection result of the water quality detection unit, each of the biological activated carbon tanks A connection determining unit that connects to the series or connects in parallel.

[0013]

In the above configuration, the difference between the quality of the treated water supplied to each biological activated carbon tank device and the quality of the treated water sent to the next step is detected by the water quality detection unit, and the connection determination unit detects the difference. Based on the detection result of the water quality detection unit, the biological activated carbon tanks are connected in series or connected in parallel to maintain the quality of treated water to be sent to the next step within a preset range.

[0014]

FIG. 1 is a block diagram showing an embodiment of a purification system according to the present invention.

The purification system shown in FIG. 1 includes an ozone reactor 1 and four biologically activated carbon tanks 2a to 2d.
And a treated water pump device 3. When treated water 4 treated by a coagulation sedimentation tank or a sand filtration tank is supplied, the treated water 4 is guided to the ozone reaction tank device 1, where organic matter in the treated water 4 is treated. After decomposing, decolorizing, deodorizing, or improving the biological treatment property, the respective biological activated carbon tank devices 2a to 2d are combined and retained for a time corresponding to the quality of the treated water 4 to be purified.
Send to the next processing step.

The ozone reaction tank apparatus 1 stores an inflow pipe 5 for taking in the treated water 4 treated by the coagulation sedimentation tank or the sand filtration tank, and the treated water 4 taken in by the inflow pipe 5. An ozone reaction tank 6, an air diffusion tube 7 disposed on the lower side of the ozone reaction tank 6, and an ozone generation unit disposed outside the ozone reaction tank 6 to generate ozone and guide it to the air diffusion tube 7. Treated water 4 in the ozone reactor 6
An ozone generator 9 that generates ozone bubbles 8 therein, and an ozonated water pump 10 that takes in the treated water 4 in the ozone reaction tank 6 and feeds the treated water 4 to the biological activated carbon tank device 2a.

When the treated water 4 supplied by the coagulating sedimentation tank or the sand filtration tank is supplied, the treated water 4 is guided to the ozone reaction tank 6 by the inflow pipe 5, supplied from the ozone generator 9, and discharged from the diffusion pipe 7. The organic matter in the treated water 4 is decomposed, decolorized, and deodorized by the oxidizing power of ozone, and the biological treatment property of the organic matter is improved. The ozone-treated water 4 is sent to the biological activated carbon tank device 2a.

The biological activated carbon tank device 2a measures the water temperature of the treated water 4 sent by the ozonated water pump 10 and the dissolved oxygen amount of the treated water 4 sent by the ozonated water pump 10. A dissolved oxygen meter 12 to be measured, an inflow valve 13a for passing the treated water 4 sent by the ozonated water pump 10 when it is in an open state, and the treated water 4 having passed through the inflow valve 13a are stored. Biological activated carbon tank 14a and this biological activated carbon tank 14a
A support member 15a provided on the lower side of the inside, a biological activated carbon 16a disposed in the biological activated carbon tank 14a and supported by the support member 15a,
An outflow valve 17a that draws out the treated water 4 in the biological activated carbon tank 14a and sends it to the treated water pump device 3, and a treated water that takes in the treated water 4 in the biological activated carbon tank 14a and sends it to the next biological activated carbon tank device 2b. And a pump 18a.

When the inflow valve 13a is in the open state, the temperature of the treated water 4 supplied from the ozone reaction tank device 1 and the amount of dissolved oxygen are measured, and the treated water 4 is passed therethrough so as to pass therethrough. After being led inside, biological activated carbon 16a
While purifying the water, and opening the outflow valve 17a to extract the purified treated water 4 in the biological activated carbon tank 14a and sending it to the treated water pump device 3,
By operating the treated water pump 18a, the treated water 4 is sent to the next biological activated carbon bed device 2b.

When the biological activated carbon tank device 2b is in the open state, the connecting inflow valve 19b through which the treated water 4 supplied from the preceding biological activated carbon tank device 2a passes is provided. An inflow valve 13b through which the treated water 4 sent from the reaction tank apparatus 1 passes;
And a biological activated carbon tank 14b for storing the treated water 4 that has passed through the connection inflow valve 19b, a support member 15b provided at a lower side in the biological activated carbon tank 14b, and the biological activated carbon tank 1
A biological activated carbon 16b disposed in the support material 15b and supported by the support material 15b; and an outflow valve 17b for extracting the treated water 4 from the biological activated carbon tank 14b and sending the treated water 4 to the treated water pump device 3 when in an open state. , The biological activated carbon tank 14
b) to take in the treated water 4 in the next biological activated carbon tank device 2c
And a treated water pump 18b for supplying water to the pump.

When the inflow valve 13b is in the open state, the treated water 4 supplied from the ozone reaction tank apparatus 1 is passed into the biological activated carbon tank 14b, and the connection inflow valve 19b is in the open state. When the treatment water 4 supplied from the preceding biological activated carbon tank device 2a is introduced into the biological activated carbon tank 14b, the treated water 4 is passed through the biological activated carbon 16b for purification, and the outflow valve 17b is opened. The purified treated water 4 in the biological activated carbon tank 14b is extracted and sent to the treated water pump device 3 or the treated water pump 18
b is operated to send the treated water 4 to the next biologically activated carbon layer device 2c.

The biological activated carbon tank device 2c, like the biological activated carbon tank device 2b described above, has a connecting inflow valve 19c for passing the treated water 4 supplied from the preceding biological activated carbon tank device 2b when in the open state. When in the open state, an inflow valve 13c for passing the treated water 4 sent from the ozone reaction tank device 1, and an organism for storing the treated water 4 that has passed through the inflow valve 13c and the connection inflow valve 19c. Activated carbon tank 1
4c, a supporting member 15c provided on a lower side in the biological activated carbon tank 14c, and a biological activated carbon 16 disposed in the biological activated carbon tank 14c and supported by the supporting material 15c.
c, when in the open state, the biological activated carbon tank 14
c and an outflow valve 17c for withdrawing the treated water 4 in the treated water pump device 3 from the biological activated carbon tank 14c
And a treated water pump 18c for feeding water to the next biologically active carbon tank device 2d.

When the inflow valve 13c is open, the treated water 4 supplied from the ozone reaction tank device 1 is passed to the biological activated carbon tank 14c, and the connection inflow valve 19c is opened. When the treatment water 4 supplied from the biological activated carbon tank device 2b at the preceding stage is guided to the biological activated carbon tank 14c, the treated water 4 is passed through the biological activated carbon 16c for purification, and the outflow valve 17c is opened. The purified treated water 4 in the biological activated carbon tank 14c is extracted and sent to the treated water pump device 3 or the treated water pump 1
8c is operated to feed the treated water 4 to the next biologically activated carbon bed device 2d.

When the biological activated carbon tank device 2d is in the open state, the connection inflow valve 19d for passing the treated water 4 supplied from the preceding biological activated carbon tank device 2c is provided. An inflow valve 13d through which the treated water 4 sent from the reaction tank apparatus 1 passes;
Activated carbon tank 14d for storing the treated water 4 having passed through the connection inflow valve 19d, a support member 15d provided at a lower side in the activated carbon tank 14d, and the activated carbon tank 1
A bioactive carbon 16d disposed in the support material 4d and supported by the support material 15d; and an outflow valve 17d for extracting the treated water 4 in the biological activated carbon tank 14d and sending the treated water 4 to the treated water pump device 3 when in an open state. It has.

When the inflow valve 13d is in the open state, the treated water 4 supplied from the ozone reaction tank device 1 is passed through the biological activated carbon tank 14d, and the connection inflow valve 19d is in the open state. When the treatment water 4 supplied from the preceding biological activated carbon tank device 2c is introduced into the biological activated carbon tank 14d, the treated water 4 is passed through the biological activated carbon 16d for purification, and the outflow valve 17d is opened. The purified treated water 4 in the biological activated carbon tank 14d is extracted and sent to the treated water pump device 3.

The treated water pump device 3 takes in the treated water 4 from each of the biological activated carbon tank devices 2a to 2d and sends it to the next treatment step.
0 and a dissolved oxygen meter 21 for measuring the amount of dissolved oxygen in the treated water 4 sent to the next treatment step. The treated water 4 is taken in from each of the biologically activated carbon tank devices 2a to 2d, and After measuring the amount of dissolved oxygen, it is sent to the next processing step.

Next, the processing operation of this embodiment will be described with reference to the flowchart shown in FIG.

First, when the treated water 4 treated by the coagulating sedimentation tank or the sand filtration tank is supplied through the inflow pipe 5, the treated water 4 is guided to the ozone reaction tank 6 by the inflow pipe 5, and then is supplied to the ozone generator 9. Ozone bubbles 8 supplied from the air and exiting from the diffuser 7
After the organic matter in the treated water 4 is decomposed, decolorized and deodorized by the oxidizing power of the ozone, and the biological treatment property of the organic matter is improved, the ozone-treated water pump 10 The treated water 4 in the tank 6 is sent to the first biologically activated carbon tank device 2.

At this time, the ozone reactor 1
The temperature of the treated water 4 and the dissolved oxygen amount are measured, and when the water temperature is relatively high such as in summer, each of the inflow valves 13a to 13d is opened and each of the connection inflow valves 19b to 19d is closed. And each connecting pump 18
a to 18c are stopped and each biological activated carbon tank device 2a to
2d are operated in parallel.

As a result, the treated water 4 sent from the ozone reaction tank apparatus 1 passes through each of the inflow valves 13a to 13d, and flows into the biological activated carbon tank 14 of each of the biological activated carbon tank apparatuses 2a to 2d.
After being guided to the biological activated carbon 16a to 16d, it is purified by passing through the biological activated carbon 16a to 16d, and the purified treated water 4 in the biological activated carbon tank 14a by the outflow valves 17a to 17d.
Is extracted and sent to the treated water pump device 3, where it is sent to the next treatment step by the treated water pump 18a.

The temperature of the treated water 4 sent from the ozone reaction tank device 1 is low, such as in winter, and the treated water 4 measured by the dissolved oxygen meter 12 provided in the first biological activated carbon tank device 2a is used. And the dissolved oxygen amount of the treated water 4 sent to the next treatment step, which is measured by the dissolved oxygen meter 21 provided in the treatment pump device 3, is calculated. S is compared with preset lower limit value A and upper limit value B (step ST1).

If the concentration difference S is equal to or larger than the lower limit value A and smaller than the upper limit value B, each outflow valve provided in the first biological activated carbon tank device 2a and the third stage biological activated carbon tank device 2c is provided. 17a and 17c are closed, the operation of the connection pumps 18a and 18c provided in these biological activated carbon tank devices 2a and 2c is started, and the second stage biological activated carbon tank device 2b and the final stage biological activated carbon Each inflow valve 13b, 1 provided in the tank device 2d
3d is closed, and each connection valve 19b, 19d provided in each of these biological activated carbon tank devices 2b, 2d.
Is opened.

Thus, the first biological activated carbon tank device 2
a and the second-stage biological activated carbon tank device 2b are connected in series, and the treated water 4 sent from the ozone reaction tank device 1
Is the inflow valve 13 provided in the first biological activated carbon tank device 2a.
a to the biological activated carbon tank 14a, where it is purified by the biological activated carbon 16a, and then extracted by the connecting pump 18a.
b is led to the biological activated carbon tank 14b via the inflow valve 19b, where it is purified by the biological activated carbon 16b, and then sent to the treated water pump device 3 via the outflow valve 17b.

In addition, by the above-described operation, the third-stage biological activated carbon tank device 2c and the last-stage biological activated carbon tank device 2d are connected in series, and the treated water 4 sent from the ozone reaction tank device 1 becomes 3 The biological activated carbon tank 14c is guided to the biological activated carbon tank 14c through the inflow valve 13c of the biological activated carbon tank device 2c of the stage, where it is purified by the biological activated carbon 16c, and thereafter, the connection pump 18c
And the biological activated carbon tank 14 via the connection inflow valve 19d of the biological activated carbon tank device 2d at the final stage.
d, where it is purified by biological activated carbon 16d and then sent to the treated water pump device 3 via an outflow valve 17d.

Then, the treated pump 4 provided in the treated water pump device 3 takes in the purified treated water 4 sent from the second-stage biological activated carbon tank device 2b and the last-stage biological activated carbon tank device 2d. At the same time, after the dissolved oxygen amount is measured by the dissolved oxygen meter 21, the water is sent to the next processing step.

That is, the amount of dissolved oxygen in the treated water 4 measured by the dissolved oxygen meter 12 provided in the first biological activated carbon tank device 2a and the amount of dissolved oxygen measured by the dissolved oxygen meter 21 provided in the treatment pump device 3 were measured. Concentration difference S with dissolved oxygen amount of treated water 4
Is not less than the preset lower limit value A and smaller than the upper limit value B, it is determined that the biological activity of each of the biological activated carbons 14a to 14d provided in each of the biological activated carbon tank devices 2a to 2d is slightly reduced. The first biological activated carbon tank apparatus 2a and the second biological activated carbon tank apparatus 2b are connected in series, and the third biological activated carbon tank apparatus 2c and the last biological activated carbon tank apparatus 2d are connected in series. The residence time of the treated water 4 sent from the ozone reaction tank device 1 is doubled and treated, and then taken in by the treated water pump 20 of the treated water pump device 3 and sent to the next treatment step ( Step ST2).

The dissolved oxygen amount of the treated water 4 measured by the dissolved oxygen meter 12 provided in the first biological activated carbon tank device 2a and the dissolved oxygen meter 2 provided in the treatment pump device 3
When the concentration difference S from the amount of dissolved oxygen of the treated water 4 measured in Step 1 is smaller than the lower limit value A (Step ST3), each of the biologically activated carbons 14a to 14d provided in each of the biologically activated carbon tank devices 2a to 2d. It is determined that the biological activity has been significantly reduced, and the inflow valves 13b to 13d provided in the second and subsequent biological activated carbon tank devices 2b to 2d are closed, and the three-stage biological activated carbon tank device 2a is closed from the first biological activated carbon tank device 2a. Each of the outflow valves 17a to 17c provided up to the eye biological activated carbon tank device 2c
17c are closed and these first biological activated carbon tank devices 2a
To the last biological activated carbon tank device 2d.

As a result, the treated water 4 sent from the ozone reaction tank device 1 is guided to the biological activated carbon tank 14a via the inflow valve 13a provided in the first biological activated carbon tank device 2a, where the biological activated carbon 16a is introduced. And then extracted by the connection pump 18a, and connected to the connection inflow valve 19b provided in the second-stage biological activated carbon tank device 2b.
Through the biological activated carbon tank 14b, where it is purified by the biological activated carbon 16b.

Hereinafter, similarly, the treated water 4 purified by the second-stage biological activated carbon tank device 2b is supplied to the biological activated carbon tank 14c via the connection inflow valve 19c provided in the third-stage biological activated carbon tank device 2c. It is guided and purified by the biological activated carbon 16c, and is thereafter extracted by the coupling pump 18c.
It is guided to the biological activated carbon tank 14d via 9d and purified by the biological activated carbon 16d, and then sent to the treated water pump device 3 via the outflow valve 17d.

Then, the treated pump 4 provided in the treated water pump device 3 takes in the purified treated water 4 sent from the biological activated carbon tank device 2 d at the final stage, and the dissolved oxygen by the dissolved oxygen meter 21. After the amount is measured, water is sent to the next processing step (step ST
4).

The dissolved oxygen amount of the treated water 4 measured by the dissolved oxygen meter 12 provided in the first biological activated carbon tank device 2a and the dissolved oxygen meter 2 provided in the treatment pump device 3
When the concentration difference S from the dissolved oxygen amount of the treated water 4 measured in Step 1 is equal to or higher than the upper limit B (Step ST5),
It is determined that the biological activity of each of the biologically activated carbons 14a to 14d provided in each of the biologically activated carbon tank devices 2a to 2d is sufficient, and the biologically activated carbon tank devices 2a to 2d are processed in the same manner as in the summer. The respective inflow valves 13a to 13d are opened, the respective connection inflow valves 19b to 19d are closed, the respective connection pumps 18a to 18c are stopped, and the respective biological activated carbon tank devices 2a to 2d are operated in parallel.

Thus, the treated water 4 sent from the ozone reaction tank device 1 is supplied to the biological activated carbon tank 14a of each of the biological activated carbon tank devices 2a to 2d through the respective inflow valves 13a to 13d.
To 14d, purified by biological activated carbon 16a to 16d, extracted by outflow valves 17a to 17d, sent to the treated water pump device 3, and treated with the treated water pump 1.
8a, water is sent to the next processing step (step ST
6).

As described above, in this embodiment, the dissolved oxygen meter 12 provided in the first biological activated carbon tank device 2a is used.
In accordance with the concentration difference S between the dissolved oxygen amount of the treated water 4 measured in the above step and the dissolved oxygen amount of the treated water 4 sent to the next treatment step measured by the dissolved oxygen meter 21 provided in the treatment pump device 3. The contact time (residence time) between the treated water 4 sent from the ozone reaction tank device 1 and each of the biological activated carbons 16a to 16d is changed, so that the water temperature decreases and the biological activated carbon 16a
Even when the activity of 〜16d changes, the change can be detected and the residence time in the biological activated carbon 16aａ16d portion can be controlled to maintain the treated water quality at a constant value.

In the above-described embodiment, the amount of dissolved oxygen in the treated water 4 measured by the dissolved oxygen meter 12 provided in the first biological activated carbon tank device 2a and the treatment pump device 3
When the concentration difference S between the amount of dissolved oxygen in the treated water 4 sent to the next treatment step and measured by the dissolved oxygen meter 21 provided in the above is not less than the upper limit B, each of the biological activated carbon tank devices 2a to 2
d is operated in parallel, the flow rate of the treated water 4 flowing through each of the biologically activated carbon tank devices 2a to 2d is set to 1 compared to when these biologically activated carbon tank devices 2a to 2d are operated in series. / 4, so that even if the biological activity of each of the biologically activated carbons 14a to 14d is slightly low, a sufficient purification treatment can be performed.

[0045]

As described above, according to the present invention, even when the treatment temperature of biologically activated carbon changes due to a decrease in water temperature, the change is detected and the residence time in the biologically activated carbon is controlled to control the treatment. Water quality can be maintained at a constant value.

[Brief description of the drawings]

FIG. 1 is a block diagram showing one embodiment of a purification processing system according to the present invention.

FIG. 2 is a flowchart showing an operation example of the purification processing system shown in FIG.

FIG. 3 is a block diagram showing an example of a conventionally known purification processing system.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Ozone reaction tank apparatus 2a-2d Biological activated carbon tank apparatus 4 Treated water 12, 21 Water quality detection part (dissolved oxygen meter) 13a-13d Connection determination part (inflow valve) 17a-17d Connection determination part (outflow valve) 18a-18c Connection Decision part (connection pump) 19b-19d Connection decision part (connection inflow valve)

Claims (1)

(57) [Claims] 1. A plurality of biologically activated carbon tank devices for processing the supplied treated water and sending the treated water to the next step, the quality of the treated water supplied to each of the biologically activated carbon tank apparatuses, and the treatment to be sent to the next step. A water quality detection unit that detects a difference from the water quality of water, and a connection determination unit that connects each of the biological activated carbon tanks to a series based on a detection result of the water quality detection unit or connects them in parallel. Purification treatment system characterized by the above-mentioned.