JP2832736B2 - Wastewater treatment apparatus, its control apparatus and its control method - Google Patents

Description

The present invention relates to a wastewater treatment apparatus for biologically treating raw water by attaching microorganisms to the surface of a filled carrier while supplying an oxygen-containing gas such as air. The present invention relates to the control device and the control method. Here, the oxygen-containing gas refers to air, oxygen itself, or a gas containing oxygen.

[Conventional technology]

2. Description of the Related Art Conventionally, various types of wastewater treatment devices for biologically decomposing raw water containing organic matter by attaching microorganisms to the surface of a filled carrier have been disclosed. In such a wastewater treatment apparatus, a treatment tank is filled with carrier particles, an upward flow or a downward flow is generated in the treatment tank, and the wastewater containing organic matter is passed through to perform the treatment. For the carrier to be filled in the wastewater treatment device, for example, ceramic particles having a particle size of 10 mm to 50 mm are used. The gas supplied to the processing tank is
Mainly air is used, but in some cases,
Oxygen or a gas containing oxygen may be used.

As the above wastewater treatment apparatus, for example,
There is a biological filtration device for organic sewage disclosed in JP 61-291098. The biological filtration device for organic sewage is filled with a granular medium in a tank to form a filter layer, and feeds raw sewage in a downward flow while feeding air from below into the filter layer to filter the sewage. At the same time, an aerobic treatment of the granular medium with the epiphytic microorganisms is performed. An air pipe for intermediate cleaning is buried from the upper part of the filter layer, and the intermediate cleaning wastewater at a higher level is located at the top of the filter layer. Water outlet is installed.

[Problems to be solved by the invention]

However, in the above-described wastewater treatment apparatus, a blockage state occurs in the treatment tank due to the passage of wastewater containing organic matter, that is, raw water for a long time.
When the inside of the treatment tank is closed, a short-path phenomenon occurs in which the waste water to be injected and the air supplied from the air supply pipe flow only in places where it can easily pass, and the treatment efficiency of the waste water is reduced. Therefore, when a clogging state occurs in the processing tank, the clogging state must be eliminated by backwashing the inside of the processing tank.

In addition, the above-mentioned organic sewage biological filtration device only has an air supply pipe installed in the upper part of the filter bed, and the effect of backwashing is not sufficient. The problem of how to perform the operation has not been solved, and issues remain.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems. In biological treatment of wastewater containing organic matter, that is, wastewater, the particle size of a carrier such as coral particles is hardly blocked or hardly blocked. When the carrier is filled into a treatment tank, the carrier is filled into the treatment tank, and air is discharged into the lower part of the treatment tank during the normal treatment process. Supply and discharge of wastewater continuously from the upper and lower parts of the treatment tank and discharge of the treated water from the lower and upper parts of the treatment tank, enabling high-load treatment of wastewater. In the treatment process, backwashing of the treatment tank is performed intermittently. At the time of the backwash, a large amount of air is supplied from the upper part of the filter bed of the treatment tank, then from the lower part, and finally from the lower part of the filter bed. Supply a large amount of water from the bottom or bottom of the treatment tank, By collecting the wastewater backwashed from inside the tank from the upper part, the clogged state inside the processing tank can be quickly and reliably eliminated by a simple backwashing operation, preventing the clogged state inside the processing tank from occurring. Prevents the occurrence of short paths that occur during raw water treatment and treatment tank backwashing, improves backwashing effect, achieves backwashing in a short time, improves treatment efficiency, and enables high-load treatment of wastewater. It is an object of the present invention to provide a wastewater treatment device, a control device thereof, and a control method thereof.

[Means for solving the problem]

The present invention is configured as follows to achieve the above object.

The present invention relates to a treatment tank for treating raw water, a particle size filled in the treatment tank without flowing in the treatment tank, and a microorganism adhered to a surface for biologically treating the raw water. 10 mm to 50 mm carrier, a plurality of gas supply pipes respectively installed at different depths of the carrier filling section in the processing tank, and another gas supply pipe installed below the carrier filling section A blower for supplying an oxygen-containing gas to each of the gas supply pipes, a raw water supply pipe and a treated water discharge pipe provided in the treatment tank, a pump for supplying the raw water to the treatment tank, and each of the gas supply pipes; The present invention relates to a wastewater treatment device including control valves that are independently provided on a raw water supply pipe and a treated water discharge pipe to be opened and closed.

In this wastewater treatment apparatus, the same pipe can be shared between the raw water supply pipe and the treated water discharge pipe provided at the lower part of the treatment tank by opening and closing the control valve.

Alternatively, the present invention provides a treatment tank for treating raw water, wherein microorganisms are attached to the surface of the treatment tank without flowing in the treatment tank and are biologically treated with the raw water. A carrier having a particle size of 10 mm to 50 mm, a plurality of gas supply pipes installed at different depths of the carrier filling site in the treatment tank, and another gas installed below the carrier filling site A supply pipe, a blower for supplying an oxygen-containing gas to each of the gas supply pipes, a raw water supply pipe and a treated water discharge pipe provided in the treatment tank, a pump for supplying the raw water to the treatment tank, the gas supply pipes, Independently operated control valves provided on the raw water supply pipe and the treated water discharge pipe, respectively, for detecting a supply amount of the raw water to the treatment tank and a discharge amount of the treated water from the treatment tank. Sensor, liquid level of the processing tank A sensor for detecting, as well as to the wastewater treatment control device in response a controller for controlling the operating state of the pump and the opening and closing amount and the blower of the control valve to the detection signals of the sensors.

Alternatively, the present invention uses the wastewater treatment control device to control the opening / closing operation of each of the control valves according to a command from the controller, and during normal treatment of raw water, injects raw water from the raw water supply pipe and supplies the treated water. In addition to discharging treated water from a discharge pipe, an oxygen-containing gas is supplied from the gas supply pipe below the treatment tank, and water is injected from the raw water supply pipe during backwashing in the treatment tank. The gas is discharged from the upper part of the processing tank by overflow, and the oxygen-containing gas is first supplied from the gas supply pipe located at the upper part of the processing tank and then from the gas supply pipe located at the lower part of the processing tank. Wastewater treatment control method.

[Action]

The wastewater treatment device, the treatment control device, and the treatment control method according to the present invention are configured as described above and operate as follows.

As described above, this wastewater treatment device has a fixed bed in which a carrier with a particle size of 10 mm to 50 mm for attaching microorganisms to the surface is placed without flowing in the treatment tank and forms a fixed bed. The control valves provided at each gas supply pipe, raw water supply pipe, and treated water discharge pipe provided at the depths of the depths were configured to open and close independently.
A blower is capable of independently supplying oxygen-containing gas to a plurality of gas supply pipes provided at a carrier filling site in a treatment tank, that is, at different depths of a filter bed, and a pump is provided for a raw water supply pipe provided in the treatment tank. And supplying raw water to the treated water discharge pipe and the treatment tank, operating the control valve, respectively, and supplying air from below the filter bed of the treatment tank during the normal wastewater treatment step, and discharging the wastewater to the upper or lower part of the treatment tank. And the treated water that has been treated can be discharged from the lower or upper part of the treatment tank. Also, at the time of backwashing in the processing tank, the control valves are independently opened and closed to increase the air volume, supply air at first from the upper part to the lower part, and inject waste water from the lower part of the processing tank. In addition, by recovering the wastewater from which the inside of the processing tank has been backwashed from the upper part, the open / close state in the processing tank can be eliminated by simple backwashing work, and the occurrence of blockage in the processing tank can be prevented. Alternatively, the backwash in the processing tank can be easily and reliably performed irregularly.

In the wastewater treatment apparatus, the wastewater treatment control device may include sensors for detecting a supply amount of raw water to the treatment tank and a discharge amount of treated water from the treatment tank, and a liquid surface depth of the treatment tank. A sensor for detecting, and a controller for controlling an opening / closing amount of the control valve and an operating state of the blower and the pump which are independently opened / closed in response to a detection signal of each of the sensors; The operation of the control valves, the pump and the blower is controlled by a command from the controller which receives a detection signal from the controller, and normal processing of wastewater and backwashing in the processing tank can be automatically performed.

Further, in this wastewater treatment control method, during normal treatment of raw water, treated water is discharged while continuously supplying raw water to the treatment tank, and oxygen-containing gas is supplied from the lower part of the treatment tank.
Also, at the time of backwashing in the processing tank, water is injected from the lower part of the processing tank and discharged from the upper part by overflow, and the oxygen-containing gas with increased air volume is supplied from the uppermost part first and then from the lower part. As described above, since the opening / closing operation of the control valve is controlled by the controller, the backwashing is performed as compared with the normal processing of the raw water.
Control of supplying oxygen-containing gas 2 to 10 times and supply of raw water 2 to 5 times can be performed. In addition, the order of blowing the oxygen-containing gas makes it possible to reliably and smoothly eliminate the blocked state from the upper part to the lower part. it can.

〔Example〕

Hereinafter, a wastewater treatment device, a control device thereof, and a control method thereof according to the present invention will be described with reference to the drawings.

FIG. 1 shows an embodiment of a wastewater treatment apparatus according to the present invention. The wastewater treatment apparatus of this embodiment uses air as the oxygen-containing gas, and is mainly placed on the treatment tank 1, the ventilation and water-permeable floor 27 in the treatment tank 1, without flowing. Packed carrier 10, filter bed composed of carrier 10, a plurality (three in the figure) installed at carrier filling site of treatment tank 1, that is, at different depths of the filter bed
Air supply pipes 11, 12, and 13, a blower 3 that operates to supply air to the air supply pipes, raw water supply pipes 17 and 18 provided at the upper part of the processing tank 1, and a raw water supply and The treated water discharge pipe 14 for treated water drainage, the pump 2 for supplying raw water containing organic matter to the treatment tank 1, and the air supply pipes 11, 12, 13, the raw water supply pipes 17, 18, and the treated water discharge pipe 14 The control valves 4, 5, 6, 7, 8, and 9 are provided to be independently opened and closed.

This wastewater treatment apparatus biologically treats raw water injected into the treatment tank 1 by attaching microorganisms to the surface of the carrier 10 in the filter bed formed in the treatment tank 1. In order to prevent the occurrence of a closed state, the inside of the processing tank 1 can be backwashed. In the figure, the carrier 10 is indicated by a two-dot chain line.
Is omitted, but the carrier 10 is filled in the entire filter bed formed on the floor 27 in the processing tank 1.

In order to supply the air sent from the blower 3 into the processing tank 1, the air supply pipe 24 connected to the blower 3 is connected to each of the air supply pipes, that is, the air supply pipe 1 located at the upper part in the processing tank 1.
1. The air supply pipe 12 is branched into an air supply pipe 12 located at a central part in the processing tank 1 and an air supply pipe 13 located at a lower part in the processing tank 1. These air supply pipes 11, 12, and 13 extend in a horizontal direction from one side of the processing tank 1 to the other side.
13 has a number of air outlets. Further, although not shown, the air supply pipes 11, 12, 13 may of course be constituted by branching into a plurality of pipes instead of a single pipe. A control valve 7 is provided at an inlet portion of the air supply pipe 11 located at the upper part, a control valve 8 is provided at an inlet part of the air supply pipe 12 located at the central part, and an air supply pipe located at the lower part is provided. A control valve 9 is provided at the 13 inlet portion. Therefore, in the treatment process of the wastewater treatment device, the desired depth in the treatment tank 1 is determined in accordance with the normal raw water treatment process and the backwashing process in the treatment tank 1 by the opening / closing degree of the control valves 7, 8, 9 or the closing operation. A desired amount of air can be supplied into the processing tank 1 from the portion.

Also, in order to inject raw water containing organic matter into the treatment tank 1, raw water is pumped from the raw water reservoir by the operation of the pump 2, and then supplied from the raw water supply pipe 25 to the raw water supply pipe provided with the control valve 4.
17 to the distribution tank 15, and from the distribution tank 15 through the raw water supply pipe 18 of each processing tank 1, from above the processing tank 1 to the processing tank 1.
It is injected into. Raw water can also be supplied from the lower part of the treatment tank 1 through the treated water discharge pipe 14 from the raw water supply pipe 23 provided with the control valve 5 branched from the raw water supply pipe 25. That is, the raw water supply pipe 23 is connected to the treated water discharge pipe 14 through the liquid flow pipe 19. In the figure, the raw water supply pipe 23 is connected to the treated water discharge pipe 14 provided at the lower part of the treatment tank 1, but the raw water supply pipe 23 is connected to another raw water supply pipe provided at the lower part of the treatment tank 1. Needless to say, it may be provided at Furthermore,
The raw water supply pipe 25 is provided with a flow rate sensor 21 for detecting a supply amount of raw water supplied to the treatment tank 1.

The treated water discharge pipe 14 passes through a liquid flow pipe 19 and a treated water discharge pipe 22 provided with the control valve 6. The treated water discharge pipe 22 is for discharging treated water from the treatment tank 1 to a predetermined place. The treated water discharge pipe 14 extends horizontally from one side of the treatment tank 1 to the other side, and has a large number of water ports. Although not shown, the treated water discharge pipe 14 may, of course, be branched into a plurality of pipes instead of a single pipe. Further, in this wastewater treatment apparatus, the raw water supply pipe 25 is provided with a flow rate sensor 21 for detecting the flow rate of the raw water supplied to the treatment tank 1. Further, a flow rate sensor 20 for detecting the flow rate of the processing water discharged from the processing tank 1 is provided.

As the carrier 10 to be filled in the treatment tank 1, a porous material that wears moderately, for example, coral particles, coke, lapilli, etc. can be used. Furthermore, these carriers 10
An optimal particle size, in which a clogging state in the treatment tank 1 is unlikely to occur and which can be easily and immediately eliminated by supplying water and air even if a clogging state occurs, for example, a particle size of 10
Select from mm to 50mm. If the particle size of the carrier 10 is too small, a clogged state is likely to occur, and the generated clogged state cannot be easily eliminated by supplying water and air. On the other hand, if the particle size of the carrier 10 is too large, the surface of the carrier will be reduced, making it unsuitable as a place for microorganisms.

The wastewater treatment apparatus according to the present invention is configured as described above, and can operate as follows. In this wastewater treatment apparatus, in order to biologically treat raw water containing organic matter in the treatment tank 1, a predetermined amount of the carrier 10 is first filled in the treatment tank 1. During the normal treatment of raw water, the control valve 4 is opened, the control valves 5 and 6 are closed, and the pump 2
Is operated to supply the raw water from the upper part of the treatment tank 1 through the raw water supply pipes 17 and 18. Further, the control valve 9 is opened, the control valves 7 and 8 are closed, and the blower 3 is operated to supply air from the lower part of the processing tank 1 through the air supply pipe 13. Raw water is injected into the treatment tank 1, and the control valve 6 is opened to release treated water from the treated water discharge pipe 14 through the control valve 6.
The raw water is treated by controlling the operation capacity of the pump 2 so as to maintain the raw water at a predetermined level while discharging the water to 22. That is, in the wastewater treatment apparatus, the pump 2
While supplying the specified amount of raw water,
This is performed in a processing step of continuously treating raw water by releasing a predetermined amount of treated water from 14. In some cases, the raw water may be injected into the treatment tank 1 from below and the treated water may be drained from above to treat the raw water.

After the raw water is decomposed for a predetermined period by this wastewater treatment apparatus or when a clogged state occurs in the treatment tank 1, the control valves are set as follows to backwash the inside of the treatment tank 1. Switch to. That is, the control valve 4 and the control valve 6 are closed, and the control valve 5 is opened. By operating the pump 2, the raw water is injected into the processing tank 1 through the raw water supply pipes 25 and 23 from the processing water discharge pipe 14 provided at the lower part of the processing tank 1. Processing tank 1
The raw water to be injected into the tank increases the capacity of the pump 2 and injects a flow rate 2 to 5 times that of the ordinary raw water treatment. The raw water is supplied from the overflow drainage channel 16 provided on the upper surface of the treatment tank 1 to the raw water. Collect in the reservoir. Further, in order to supply the air into the processing tank 1 and eliminate the blockage, the capacity of the blower 3 is increased to supply 2 to 10 times more air into the processing tank 1 as compared with the normal raw water treatment. First, the control valve 8 and the control valve 9 are closed and the control valve 7 is opened. The operation capacity of the blower 3 is increased to increase the air volume, and air is supplied from the air supply pipe 11 above the processing tank 1 into the processing tank 1. After the closed state of the upper part of the processing tank 1 is eliminated, the control valve 8 is opened and the control valve 7 is closed. As a result, air is supplied from the air supply pipe 12 at the center of the processing tank 1, and the closed state of the center in the processing tank 1 is eliminated. After the closed state of the central part in the processing tank 1 is eliminated, the control valve 9 is opened and the control valve 8 is closed. Air is supplied from an air supply pipe 13 below the processing tank 1 to open a closed state of the lower part of the processing tank 1.

Alternatively, when the processing tank 1 is backwashed, the opening / closing operation of the control valves 7, 8, 9 for supplying air into the processing tank 1 is not limited to the above opening / closing operation, and the control valves 7, 8 , 9 are all opened, the control valve 7 for the upper air supply pipe 11 is closed after a lapse of a predetermined period, and the control valve 8 for the air supply pipe 12 in the center is further closed after a lapse of a predetermined period. Of course, it may be activated. However, the air supplied from the blower 3 receives the head pressure due to the presence of the raw water and the carrier 10 in the processing tank 1. Therefore, the air sent from the blower 3 into the processing tank 1 is supplied from the upper air supply pipe into the processing tank 1 and cannot be blown out from the lower air supply pipe due to the head pressure. Because it is.

The wastewater treatment device according to the present invention can achieve high-load treatment by performing continuous treatment of raw water as described above.
In addition, by performing the above-mentioned backwashing operation regularly or irregularly, the microbial film adhered to the surface of the carrier 10 is peeled off, or dead microorganisms that have already been peeled off are removed from the treatment tank 1.
Can be quickly and surely discharged from the upper part of the container, and a high-load treatment can be achieved.

Next, an embodiment of the wastewater treatment control device and the control method according to the present invention will be described with reference to FIG. This wastewater treatment control device is the same device except that the above-mentioned wastewater treatment device incorporates various sensors and a controller. Therefore, the same components are denoted by the same reference numerals, and redundant description is omitted. .

This waste water treatment control device is such that the waste water treatment device shown in FIG. A liquid level sensor 26 is provided above the processing tank 1 to detect the liquid level of the raw water supplied into the processing tank 1. The liquid level sensor 26, the sensor 21 for detecting the supply amount of raw water supplied to the treatment tank 1 through the raw water supply pipe 25,
Each detection signal from the sensor 20 that detects the flow rate of the treated water discharged from the treatment tank 1 through the treated water discharge pipe 22 is input to the controller 27. The controller 27 controls the opening / closing operation or opening / closing amount of the control valves 4, 5, 6, 7, 8, 9 in response to each of the detection signals or when a predetermined time set by a built-in timer elapses. In addition to controlling the opening and closing operation independently, the operation state or on / off of the pump 2 and the blower 3 is controlled. Commands from the controller 27 to the control valves, the pump 2 and the blower 3 are performed in the same manner as the operation of the wastewater treatment device shown in FIG.

Next, an embodiment of a wastewater treatment control method in which the wastewater treatment control device according to the present invention operates will be described with reference to the operation flowcharts shown in FIGS. 3 (A) and 3 (B).

Regarding the control method for operating this wastewater treatment control device,
Prior to biological treatment of raw water containing organic matter in the treatment tank 1, a predetermined amount of the carrier 10 is filled in the treatment tank 1 (step 30). At this time, since the device itself is stopped, the control valves 4, 5, 6 for the liquid system and the control valves 7, 8, 9 for the air system are in a closed state. In order to inject raw water into the treatment tank 1 from the top of the treatment tank 1,
27, the liquid control valve 4 is opened and the control valve 6 is opened.
Is released (step 31). Next, the pump 2 is operated (step 32). On the other hand, in order to supply air into the processing tank 1 from below, the control valve 9 of the air system is opened by a command from the controller 27 (step 33), and then the blower 3 is operated (step 34). The raw water is injected into the treatment tank 1 and a predetermined flow rate is detected by the liquid level sensor 26 (step 35), and the detection signal is input to the controller 27. The controller 27 receives the detection signal and
Then, the operation capability of the blower 3 is controlled (step 36).
Therefore, the raw water injected into the treatment tank 1 is biologically decomposed by microorganisms attached to the carrier 10 by passing between the carriers 10 filled in the filter bed. That is, the raw water is continuously supplied into the treatment tank 1 through the raw water supply pipes 17 and 18, and the decomposed treated water is supplied to the treated water discharge pipe.
From 14, through the control valve 6, the water is continuously discharged from the treated water discharge pipe 22 to a predetermined place. That is, in this wastewater treatment apparatus, as a treatment step, a predetermined amount of raw water is discharged from the treated water discharge pipe 14 while operating the pump 2 to supply a predetermined amount of raw water, and the raw water is continuously treated. And this processing state is continued. At this time, the detection signals of the raw water supply amount detection sensor 21 and the treated water discharge amount detection sensor 20 are sent to the controller.
At the same time, the detection signal of the liquid level sensor 26 is input to the controller 27. The controller 27 receives the detection signal from each sensor, and adjusts the operation state of the pump 2 and the balance between the amount of treated water discharged from the treated water discharge pipe 14 and the amount of raw water supplied from the raw water supply pipe 18. The opening of the control valve 4 and the control valve 6 is controlled.

Raw water is continuously treated in the above state. Whether or not an abnormality has occurred in the raw water treatment process is always detected, and an abnormal state can be detected as follows. That is, when a predetermined amount of raw water is supplied to the treatment tank 1, the discharge amount F of the treated water from the treated water discharge pipe 14 is determined by the detection signal from the treated water discharge detection sensor 20.
Comparing determines less or not than a predetermined discharge amount F ₀ (step 38).

When the discharge amount F of the treated water is smaller than the predetermined discharge amount F ₀ , a closed state may occur in the treatment tank 1 and a short path phenomenon may have occurred. The process proceeds to step 42 in order to perform the operation of performing backwashing of the inside.

When the discharge amount F of the treated water is larger than the predetermined discharge amount F ₀ , no clogging state occurs in the treatment tank 1, and
Since the raw water treatment process is proceeding smoothly, the normal raw water treatment process will be continued. At this time, the treated water discharge amount F
And counts the number N of the comparison determines the predetermined emissions F ₀ (step 39),該回number N predetermined number N _0, for example, in the case of less than 4 times (step 40), a predetermined time has elapsed Later (step 41), the above-mentioned comparison judgment is made again. The number N
Is larger than the predetermined number N ₀ , it is considered that the closed state in the processing tank 1 has not occurred, but since the predetermined time has already passed, the occurrence of the blocked state in the processing tank 1 has occurred. For prevention, backwashing in the processing tank 1 is performed, and the process proceeds to step 42. In this case, the time setting of the timer built in the controller 27 in step 41 can be changed as appropriate, and it is also possible to perform control so that it becomes regular or irregular.

Next, when a predetermined time period elapses, or when a clogging state occurs in the processing tank 1, each control valve is controlled by a command from the controller 27 to backwash the processing tank 1. Switch as follows. That is, switching is performed so that the control valve 4 and the control 6 are closed and the control valve 5 is opened in accordance with a command from the controller 27 (step S1).
42). Then, in accordance with a command from the controller 27, the operation capacity of the pump 2 is increased to supply raw water through the raw water supply pipes 25 and 23 and the control valve 5 to the treated water discharge pipe provided below the treatment tank 1.
From step 14, it is injected into the processing tank 1 (step 43). Processing tank 1
The raw water to be injected into the tank is increased to a flow rate 2 to 5 times as compared with the normal raw water treatment. The raw water is collected in a raw water reservoir from an overflow drainage channel 16 provided on the upper surface of the treatment tank 1.
Further, in order to supply air from the upper portion in the processing tank 1, the control valves 7 and 8 of the air supply system are opened according to a command from the controller 27 (step 44), and the operation capacity of the blower 3 is increased to increase the air volume. (Step 45). The air supplied from the blower 3 receives the head pressure due to the presence of the raw water and the carrier 10 in the processing tank 1 and is supplied into the processing tank 1 from the air supply pipe 11 located above. Therefore, the air sent from the blower 3 is supplied into the processing tank 1 from the air supply pipe 11 above the processing tank 1 through the control valve 7. Therefore, air is supplied from the air supply pipe 11 to the upper part of the processing tank 1 until a predetermined time has elapsed (step 46), and after the closed state of the upper part of the processing tank 1 is eliminated, the control valve 7 is closed (step 47). ). As a result, air is supplied from the blower 3 through the control valve 8 to the air supply pipe 12 at the center of the processing tank 1. Therefore, air is supplied from the air supply pipe 12 in the center of the processing tank 1 until a predetermined time elapses (step 48), and the closed state of the center in the processing tank 1 is eliminated. After removing the closed state of the central part in the processing tank 1,
The control valve 8 is closed (step 49). As a result, air is supplied from the blower 3 through the control valve 9 to the air supply pipe 13 below the processing tank 1. Therefore, air is supplied from the air supply pipe 13 below the processing tank 1 until a predetermined time has elapsed (step 50), and the closed state of the lower part inside the processing tank 1 is eliminated.

Next, it is determined whether or not to continue the treatment of the raw water by the wastewater treatment apparatus (step 51). If the treatment of the raw water is not to be performed, the wastewater treatment control according to the present invention is terminated, and the wastewater treatment is continued. In order to perform the normal treatment process of raw water, the control valve 5 is closed (step 5).
2) And, the control valves 4 and 6 are opened (step 53). Next, the process proceeds to step 36, in which the operating capabilities of the pump 2 and the blower 3 are controlled to a normal processing state in which the normal processing of raw water is performed. As a result, the above-mentioned ordinary processing steps of raw water are continuously repeated.

〔The invention's effect〕

A wastewater treatment apparatus according to the present invention comprises a treatment tank for biologically treating raw water by adhering microorganisms to the surface of a filled carrier, and a plurality of treatment tanks installed at different depths of the carrier filling site in the treatment tank. Gas supply pipes and gas supply pipes installed in the lower part of the carrier filling, a blower for supplying oxygen-containing gas to each of the gas supply pipes, a raw water supply pipe and a treated water discharge pipe provided in the treatment tank, Since it is composed of a pump for supplying raw water and each control valve provided on each of the pipes and operated independently of each other, each component provided in the treatment tank and the arrangement of each component can be configured compactly. During the normal wastewater treatment process, air is supplied from the lower part of the treatment tank, the wastewater is continuously and manually injected from the upper or lower part of the treatment tank, and the treated water is discharged from the lower or upper part of the treatment tank. To Ri, allowing the high-load processing of the waste water.

Also, at the time of back washing of the treatment tank, air is first supplied from the upper part of the carrier filling portion to the lower part, and then the waste water is injected from the lower part of the treatment tank and the waste water from the back washing of the treatment tank is collected from the upper part. By doing so, simple backwashing prevents clogging in the treatment tank and improves treatment efficiency. In addition, during backwashing, air is supplied from the upper part to the lower part of the filter bed in order to drain water. The occurrence of short paths that occurred during processing and backwashing is reliably prevented, the backwashing effect is improved, and the processing tank can be backwashed in a short period of time. Can be easily and reliably performed.

In addition, if the particle size of the carrier such as coral particles is selected to be an optimal particle size, for example, a particle size of 10 mm to 50 mm, the clogging state is hardly generated or even if the clogged state occurs, the backwashing is performed. The closed state can be easily eliminated in a short time.

Further, the wastewater treatment control device according to the present invention includes a plurality of gas supply pipes installed at different depths in a treatment tank for biologically treating raw water by attaching microorganisms to the surface of the filled carrier. A raw water supply pipe and a treated water discharge pipe provided in the treatment tank, respective control valves provided in the respective pipes, a blower for supplying oxygen-containing gas to the respective gas supply pipes, a pump for supplying raw water to the treatment tank, Sensors for detecting the amount of raw water supplied to the treatment tank and the amount of treated water discharged from the treatment tank,
Since it is composed of a sensor for detecting the liquid surface depth of the processing tank and a controller for controlling the opening / closing amount of the control valve and the operating state of the blower and the pump in response to the detection signal of each sensor, Automatically switches between the treatment process and the backwashing process in the above-mentioned treatment tank, so that the treatment of wastewater and the backwashing in the treatment tank can be performed regularly or irregularly, as required, reliably, in a short time, and automatically. The raw water can be treated continuously in large quantities.

Further, in the control method using the wastewater treatment control device according to the present invention, during normal treatment of raw water, raw water is injected from the upper part of the treatment tank and discharged from the lower part, and oxygen-containing substance is discharged from the lower part of the treatment tank. At the time of back washing in the processing tank, water is injected from the lower part of the processing tank and discharged by overflow from the upper part, and oxygen-containing gas is first supplied from the upper part of the processing tank and then from the lower part. Since the control valve is opened and closed by the controller and the operating capabilities of the pump and the blower are controlled so as to be supplied sequentially, backwashing of the processing tank can be performed regularly or irregularly. , Control of supplying the oxygen-containing gas 2 to 10 times and supplying the raw water 2 to 5 times at the time of the backwash compared with the normal treatment of the raw water;
Moreover, the clogging state in the filter bed filled with the carrier in the processing tank can be reliably eliminated from the upper part to the lower part in accordance with the blowing order of the oxygen-containing gas, and the clogging state generated in the processing tank is immediately reduced. It is possible to eliminate the dead microorganisms attached to the carrier to the outside of the treatment tank.

[Brief description of the drawings]

FIG. 1 is a schematic view showing an embodiment of a wastewater treatment apparatus according to the present invention, FIG. 2 is an explanatory view showing an embodiment of a wastewater treatment control apparatus according to the present invention, and FIGS. (B)
FIG. 2 is a process flowchart showing one embodiment of a wastewater treatment control method using the wastewater treatment control device according to the present invention. 1 ... Treatment tank, 2 ... Pump, 3 ... Blower, 4,5,6,7,8,9 ...
... Control valve, 10 ... Carrier, 11, 12, 13, 24 ... Air supply pipe (gas supply pipe), 14 ... Treated water drain pipe, 17, 18, 23, 25 ... Raw water supply pipe, 19 ... … Liquid flow pipe, 20, 21 …… Flow sensor, 22 ……
Treated water discharge pipe, 26 ... Liquid level sensor, 27 ... Controller.

Continuation of front page (58) Field surveyed (Int.Cl. ⁶ , DB name) C02F 3/02-3/10 B01D 24/02 B01D 24/46

Claims (4)

(57) [Claims] 1. A treatment tank for treating raw water, a particle filled in the treatment tank without flowing in the treatment tank, and having microorganisms attached to a surface for biologically treating the raw water. A carrier having a diameter of 10 mm to 50 mm, a plurality of gas supply pipes respectively installed at different depths of the carrier filling portion in the treatment tank, and another gas supply installed below the carrier filling portion A pipe, a blower for supplying an oxygen-containing gas to each of the gas supply pipes, a raw water supply pipe and a treated water discharge pipe provided in the treatment tank, a pump for supplying the raw water to the treatment tank, and each of the gas supply pipes; A wastewater treatment apparatus comprising independently operated control valves provided on the raw water supply pipe and the treated water discharge pipe, respectively; 2. The wastewater treatment apparatus according to claim 1, wherein said raw water supply pipe and said treated water discharge pipe provided at a lower portion of said treatment tank can share the same pipe by opening and closing said control valve. 3. A treatment tank for treating raw water, a particle filled in the treatment tank without flowing in the treatment tank, and having microorganisms attached to a surface for biologically treating the raw water. A carrier having a diameter of 10 mm to 50 mm, a plurality of gas supply pipes respectively installed at different depths of the filling portion of the carrier in the treatment tank, and another gas supply installed below the filling portion of the carrier A pipe, a blower for supplying an oxygen-containing gas to each of the gas supply pipes, a raw water supply pipe and a treated water discharge pipe provided in the treatment tank, a pump for supplying the raw water to the treatment tank, the gas supply pipes, Independently opened and closed control valves provided on the raw water supply pipe and the treated water discharge pipe, and sensors for respectively detecting the supply amount of raw water to the treatment tank and the discharge amount of treated water from the treatment tank , Check the liquid level of the processing tank Sensors, and the controller for controlling the operating state of the pump and the opening and closing amount and the blower of said control valve in response to the detection signals of the sensors, the waste water processing control apparatus consisting of. 4. The wastewater treatment control device according to claim 3, wherein the control valve controls the opening and closing operation of each of the control valves according to a command from the controller. During normal treatment of raw water, raw water is injected from the raw water supply pipe. In addition to discharging treated water from the treated water discharge pipe, an oxygen-containing gas is supplied from the gas supply pipe below the treatment tank, and water is supplied from the raw water supply pipe during back washing in the treatment tank. While injecting and discharging by overflow from the upper part of the processing tank, oxygen-containing gas is sequentially supplied from the gas supply pipe located first at the upper part of the processing tank and then from the gas supply pipe located at the lower part of the processing tank. A discharge processing control method comprising supplying.