JP3468414B2 - Method and system for treating organic and persistent water by ozone - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and system for treating organic and hardly decomposable wastewater generated from food processing plants and the like.

[0002]

2. Description of the Related Art Conventionally, ozone has been used in wastewater treatment processes by mixing and solubilizing high-concentration ozone gas having a diameter of 2 to 3 mmφ into organic sludge water by an air diffuser or an ejector method, and injecting ozone gas bubbles. By mixing them, the sludge's thickening property is enhanced and the sludge's sedimentation property is increased. The microorganisms are activated by mixing with air by the above method.

[0003]

As described above, the bubble diameter of the ozone gas bubbles by the diffuser system and the ejector system is as large as 2-3 mmφ and the buoyancy is also large. Therefore, the contact residence time in water is short, the surface area is small relative to the volume, and the contact area with the inflowing wastewater is small, so that the dissolution efficiency of ozone gas into the inflowing wastewater is low and a high concentration ozone gas is required. Furthermore, a lot of energy and time such as a treatment facility for exhaust ozone are required, the aeration efficiency of the inflowing raw water is poor, and facilities for countermeasures against malodor such as hydrogen sulfide are required. In addition, the pretreatment efficiency of the inflow raw water is poor, and a large amount of chemicals is required to reduce the load of the inflow water on the aeration tank.
There was also the inconvenience that the amount of industrial waste increased accordingly.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a method and system for deodorizing by reducing a large amount of load of organic and persistent water in a short time. It is in.

[0005]

SUMMARY OF THE INVENTION The present invention relates to a method and system for treating organic, hardly decomposable wastewater,
In particular, it relates to a method for reducing the load of organic, hardly decomposable wastewater in a short period of time and for deodorizing, and the above-mentioned object of the present invention is, in the invention of the method, that the mixing adjustment tank is organic, hardly decomposable Waste water is supplied to the reaction separation tank to which a gas-liquid stirring / mixing device is connected.The organic and hardly decomposable waste water is supplied from the mixing adjustment tank, and the reaction / separation tank is connected to the gas-liquid stirring / mixing apparatus to the organic liquid. , Sending hardly-decomposable wastewater and supplying ozone gas to the gas-liquid stirring and mixing device to concentrate and mix the gas-liquid to form a gas-liquid mixed solution, and to swirl the gas-liquid mixed solution into the reaction separation tank by vortex rotation diffusion. refluxed, by separating the oxidation product and a liquid, and returning the separated liquid into the mixing adjustment tank, organic supplied to newly the mixing adjusting tank,
It is a method of stirring hardly mixed with the hardly decomposable waste water in the mixing adjustment tank, and is a method of treating organic, hardly decomposed waste water with ozone, wherein a plurality of the gas-liquid stirring and mixing devices are provided, and inside the reaction separation tank. A rotary reaction separation cylinder is arranged, and the reaction separation tank is
A punching plate is placed between the rotary reaction separation cylinder and
A punching plate is placed inside the rotary reaction separation cylinder, and the organic and persistent decomposition wastewater is mixed with the reaction separation tank and the rotary reaction.
A punching plate between the separation cylinder and the rotary reaction separation cylinder
Perforated with a punching plate, organic, difficult to decompose
Sex drainage, the rotation and the gas-liquid agitation mixing apparatus which the reaction is connected to the inside of the separating cylinder, ozone gas and gas by said gas-liquid agitation and mixing apparatus connected to the outside of the rotating reaction separating cylinder
It is achieved by liquefying and concentrating and sending by vortex rotary diffusion .

Alternatively, in an organic waste treatment method using an activated sludge treatment system equipped with a raw water adjusting tank, a mixing adjusting tank, a biological treatment tank, and a sedimentation tank, the mixing adjusting tank is provided with an organic or hardly decomposable wastewater. Supplying the organic, hardly decomposable wastewater to the reaction separation tank connected to the gas-liquid agitation mixing device from the mixing adjustment tank, from the reaction separation tank to the gas-liquid agitation mixing device the organic, difficult Along with sending decomposable waste water, ozone gas is supplied to the gas-liquid stirring and mixing apparatus to concentrate and mix gas-liquid to form a gas-liquid mixed solution, and the gas-liquid mixed solution is refluxed to the reaction separation tank so as to be swirled and rotationally diffused Then , the oxidation product and the liquid are separated, the separated liquid is returned to the mixing and adjusting tank, and the organic and hardly decomposable waste water is newly supplied to the mixing and adjusting tank from the raw water adjusting tank. Mixing the separated liquid The load of the organic, hardly decomposed wastewater is reduced by stirring and mixing in a conditioning tank, and the organic, hardly decomposed wastewater with the reduced load is sent to the biological treatment tank to perform biological treatment, and then a sedimentation tank. The sludge accumulated in the lower part of the settling tank to the reaction separation tank connected to the gas-liquid stirring and mixing device, and sending the sludge from the reaction separation tank to the gas-liquid stirring and mixing device, Ozone gas is supplied to the liquid stirring and mixing device to mix it to form a gas-liquid mixed liquid, and the gas-liquid mixed liquid is refluxed to the reaction separation tank to separate the oxidation product and the liquid to reduce sludge weight / deodorization. A method for treating organic and hardly decomposable wastewater with ozone, wherein the gas-liquid stirring is connected to the reaction separation tank supplied with the organic and hardly decomposable wastewater from the mixing adjustment tank. Providing multiple mixing devices, Place the rotating reaction separating cylinder on the side, the reaction separation tank and the rotary reaction separating cylinder
A punching plate is placed between the
A punching plate is placed on the inner side, and the organic and non-decomposable wastewater flows between the reaction separation tank and the rotary reaction separation cylinder.
A punching plate and a punching plate in the rotary reaction separation cylinder.
And the organic and hardly decomposable wastewater is passed through the gas-liquid stirring / mixing device connected to the inside of the rotary reaction separation cylinder and the gas-liquid stirring / mixing device connected to the outside of the rotary reaction separation cylinder. Ozone gas and gas-liquid concentration mixture are mixed by the device ,
It is achieved by being sent in a vortex rotationally diffusive manner .

Further, in the invention of the system, in an activated sludge treatment system comprising a raw water adjusting tank, a mixing adjusting tank, a biological treatment tank, and a sedimentation tank, a reaction separation tank connected to the mixing adjusting tank, and the reaction separation tank. Of ozone to a plurality of gas-liquid agitating and mixing devices that are provided around the rotary separation cylinder arranged inside the rotary separation cylinder and the reaction separation tank, and are connected to the inside of the rotary reaction separation cylinder and the outside of the rotary separation cylinder. An ozone supply device for supplying and mixing, a means for supplying organic and hardly decomposable wastewater to the reaction separation tank from the mixing adjustment tank, and the organic material between the reaction separation tank and the gas-liquid agitation mixing device. A supply / reflux means for mutually supplying / refluxing the hardly decomposable wastewater and the ozone mixed liquid, a means for returning the ozone-treated organic and hardly decomposable wastewater to the mixing adjustment tank, and the ozone-treated Organic, persistent The load on the biological treatment tank is reduced by mixing the wastewater and the organic and refractory wastewater newly sent from the raw water adjusting tank with stirring to reduce the load of the organic and refractory wastewater. Of organic and persistent decomposition wastewater by ozone equipped with means to supply wastewater with reduced waste
A system that connects multiple gas-liquid agitation mixing devices.
In the reaction separation tank with a built-in rotary reaction separation cylinder,
Water is supplied from the reaction separation tank.
When the organic and persistent water is sent to the liquid stirring and mixing device,
In addition, ozone gas is supplied to the gas-liquid stirring / mixing device,
A gas-liquid mixed solution is obtained by concentrating and mixing, and the gas-liquid mixing is performed.
The liquid is refluxed in the reaction separation tank so as to be swirled and rotationally diffused,
Separates oxidation products and liquids,
Reaction separation tank designed to reduce water load / deodorization
As a first reaction separation tank and a second reaction separation tank in series
Connected, and in the first reaction separation tank, the gas-liquid mixture is
From the inside to the outside of the rotary reaction separation cylinder in the first reaction separation tank
After passing through the punching plate in the rotary reaction separation cylinder,
The reaction separation tank and the rotation reaction
Vortex flow diffusion through a punching plate between the separation cylinder
The first reaction in the second reaction separation tank.
The gas-liquid mixture sent from the reaction separation tank is the second
From the outside to the inside of the rotary reaction separation cylinder in the reaction separation tank,
A punching plate between the reaction separation tank and the rotary reaction separation cylinder
It passes and overflows into the rotation reaction separation cylinder, and the rotation reaction
Flows through a punching plate in a separation cylinder, vortex-rotationally diffuses
This is achieved by incorporating the reaction separation tank configured as described above .

In an activated sludge treatment system equipped with a raw water adjusting tank, a mixing adjusting tank, a biological treatment tank, a sedimentation tank, and a dehydrator, a reaction separation tank connected to the mixing adjusting tank and an inside of the reaction separation tank are provided. By supplying ozone to a plurality of gas-liquid agitating and mixing devices which are provided around the rotary separation cylinder and the reaction separation tank, which are arranged around the rotary separation cylinder and are connected to the inside of the rotary reaction separation cylinder and the outside of the rotary separation cylinder. The ozone supply device for mixing, a means for supplying organic, hardly decomposable wastewater to the reaction separation tank from the mixing adjustment tank, and the organic, hardly decomposed between the reaction separation tank and the gas-liquid stirring mixing device. Supply / reflux means for mutually supplying / refluxing the organic wastewater and the ozone mixed liquid, means for returning the ozone-treated organic and hardly decomposable wastewater to the mixing adjustment tank, and the ozone-treated organic, Persistent wastewater and raw water conditioning Wastewater with a reduced load to the biological treatment tank after stirring and mixing organic and refractory wastewater that is newly sent from the tank to reduce the load of the organic and refractory wastewater. And a means for supplying wastewater treated in the biological treatment tank to the precipitation tank, a reaction separation tank connected to the precipitation tank, and gas-liquid stirring provided around the reaction separation tank. The ozone supply device for supplying and mixing ozone to the mixing device, the means for supplying the sludge accumulated in the lower part of the precipitation tank to the reaction separation tank from the precipitation tank, the reaction separation tank and the gas-liquid agitation mixing device wherein the sludge and feeding / recirculation means for mutually supply / reflux ozone mixture, organic the sludge which has been ozonated due to ozone and means for supplying to the dehydrator, flame fraction between
A desolvable wastewater treatment system that mixes multiple gas-liquid agitators
The reaction component connected to the device and containing a rotary reaction separator
By supplying organic and non-decomposable wastewater to the separation tank, the reaction separation tank
From the gas-liquid agitation mixing device to the organic, persistent decomposition wastewater
And the ozone gas to the gas-liquid stirring and mixing device.
Supply it and concentrate it to form a gas-liquid mixture.
The gas-liquid mixture should be swirled and diffused into the reaction separation tank.
Reflux to separate the oxidation product and the liquid, said organic,
It is designed to reduce the load / deodorization of persistent water.
The reaction separation tank as the first reaction separation tank and the second reaction separation tank
Two of them are connected in series, and the gas-liquid mixture is mixed in the first reaction separation tank.
Whether the liquid mixture is inside the rotary reaction separation cylinder in the first reaction separation tank
To the outside through the punching plate in the rotary reaction separation cylinder.
Overflows from the rotary reaction separation cylinder,
Vortex passes through the punched plate between the rotary reaction minute away barrel
In the second reaction separation tank,
Is the gas-liquid mixed liquid sent from the first reaction separation tank
Is inside from the outside of the rotary reaction separation cylinder in the second reaction separation tank
To the side, the pan between the reaction separation tank and the rotary reaction separation cylinder
After passing through the pendant plate and overflowing into the rotary reaction separation cylinder,
Vortex rotation through the punching plate in the rotary reaction separation cylinder
Built-in reaction separation tank configured to diffuse and flow
It is achieved by've got.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a diagram showing the flow of a waste water treatment system incorporating the method and apparatus for reducing the load on organic, hardly decomposable waste water by ozone according to the present invention. The organic and hardly decomposable wastewater (hereinafter referred to as raw water) is sent to the raw water adjusting tank 2 where the amount of raw water to be treated in the subsequent process is adjusted. Raw water is sent from the raw water adjusting tank 2 to the mixing adjusting tank 6. When the raw water flows into the mixing and adjusting tank 6 that does not contain any raw water, the raw water that has flowed in remains as it is in the primary negative pressure type reaction separation tank 3
1, is subjected to ozone treatment in the primary negative pressure type reaction separation tank 31 and the secondary negative pressure type reaction separation tank 41, and is then sent to the mixing adjustment tank 6 again. Raw water that has been subjected to ozone treatment in the mixing and adjusting tank 6 and raw water from the raw water adjusting tank 2 are mixed. Raw water treated with ozone in the primary negative pressure type reaction separation tank 31 and the secondary negative pressure type reaction separation tank 41 (hereinafter referred to as ozone-treated water) has ozone dissolved therein. It is possible to reduce the load of the raw water to such an extent that the treated organic wastewater in the raw water is oxidatively decomposed and deodorized as a result, and can be easily treated in the next biological treatment tank (aeration tank) 61. . Biological treatment tank (aeration tank)
The treated water treated in 61 is sent to the settling tank 62. The settling tank 62 is a tank for precipitating flocs of microorganisms existing in the treated water. The supernatant liquid in this tank is discharged, and the precipitate is taken out periodically and put on a dehydrator 63 to obtain a cake from which water is removed, and processed. The above is the reduction of the load of organic and persistent decomposition wastewater by ozone /
It is a rough flow of a wastewater treatment system incorporating a deodorizing method and device.

FIG. 2 is a diagram showing the flow of the waste water treatment system in the case where the sludge of the settling tank of FIG. 1 is treated by using a negative pressure type reaction separation tank. The sludge generated in the settling tank 62 is subjected to ozone oxidation treatment in the negative pressure type reaction separation tanks 71 and 72 so that the sludge can be reduced and deodorized.

Here, the mixing adjustment tank 6, the primary negative pressure type reaction separation tank 31, and the secondary negative pressure type, which are the main parts of the method and apparatus for reducing the load and deodorization of the organic and hardly decomposable wastewater by ozone of the present invention. Reaction separation tank 41, and biological treatment tank (aeration tank) 6
The part 1 will be described in detail with reference to FIGS. 3 and 4. FIG. 3 is a side sectional view of the raw water adjusting tank 2, the mixing adjusting tank 6, the primary negative pressure type reaction separation tank 31, the secondary negative pressure type reaction separation tank 41, and the biological treatment tank (aeration tank) 61.
FIG. 4 is a plan sectional view of FIG. 3.

This apparatus comprises an ozone generator 21, a raw water adjusting tank 2 for storing organic and hardly decomposable waste water to be treated, and a primary negative pressure type reaction separation in which raw water and fine ozone gas are mixed in a negative pressure stepwise to perform oxidative separation. The tank 31, the secondary negative pressure type reaction separation tank 41, the mixing adjustment tank 6 for contact-mixing the raw water and the ozone-treated water (hereinafter, the mixture of the raw water and the ozone-treated water is referred to as mixed water), and the contact-mixed It is composed of a biological treatment tank (aeration tank) 61 for biologically treating the mixed water with reduced load. The primary rotary reaction separation cylinder 32 is a primary negative pressure type reaction separation tank.
The gas-liquid stirring / mixing tanks 36A and 36 are arranged inside 31.
B is connected to the inside of the primary rotation reaction separation cylinder 32, and agitates gas and liquid.
Mixing tanks 36C and 36D are outside the primary rotary reaction separation cylinder 32.
Connected with. From the two negative pressure type reaction separation tanks, a gas-liquid stirring and mixing tank, a recovery concentration tank 11 for recovering and concentrating the fine bubbles generated in each negative pressure type reaction separation tank and the ozone oxidation products floated and separated, and from the recovery concentration tank 11 A concentrated sludge storage tank 13 for solid-liquid separation of the concentrated ozone oxidation product is connected.

In order to generate fine ozone gas, which is a feature of the present invention, and improve the contact efficiency between the fine ozone gas and the inflowing raw water, the ozone-oxidized water inlet, the gas-liquid outlet, and the gas-liquid agitation mixing tank have two negative pressure types. It is installed in each reaction separation tank. The gas-liquid stirring / mixing tank is a tube for sucking organic, hardly decomposable waste liquid from the negative pressure type reaction separation tank, a pipe to which ozone gas is supplied, a portion for stirring and mixing ozone gas and organic, hardly decomposable waste liquid, and condensing, Then, it is composed of a pipe for sending the condensed ozone gas and the organic and hardly decomposable waste liquid to the negative pressure type reaction separation tank. Raw water flowing into each negative pressure type reaction separation tank is sucked into the gas-liquid agitation mixing tank, where the ozone generator 2
The ozone from 1 or the exhaust ozone generated during the ozone oxidation reaction in each negative pressure type reaction separation tank is stirred and contacted. The gas-liquid mixed water mixed by gas-liquid stirring is condensed and again sent to the negative pressure type reaction separation tank and blown out. Here, the gas-liquid outlet from which the gas-liquid mixed water is blown out can be adjusted to a swirling angle so that the gas-liquid mixed water is swirled and rotationally diffused in the negative pressure type reaction separation tank. It is installed in each negative pressure type reaction separation tank. Further, by making the vortex flow rotation speed higher than the floating speed of ozone bubbles, it becomes possible to efficiently contact the ozone gas with the raw water in the negative pressure type reaction separation tank.

Raw water is sent from a raw water inflow pipe 1 to a raw water adjusting tank 2. In the raw water adjusting tank 2, the amount of raw water to be treated is adjusted, and an appropriate amount of raw water is sent to the mixing adjusting tank 6 via the raw water feed pipe 4 using the water feed pump 3. The mixed water pipe 5 mixes the raw water from the raw water adjusting tank 2 with the ozone-treated water sent from the secondary negative pressure type reaction separation tank 41 described later. Here, description will be made assuming that the mixing adjustment tank 6 is empty and new raw water flows into the empty mixing adjustment tank 6, and the raw water adjustment tank 2 and the ozone-treated water from the secondary negative pressure type reaction separation tank 41 will be described later. The case where they are mixed will be described.

The raw water sent to the mixing adjusting tank 6 is sent to the primary rotary reaction separation cylinder 32 by the water sending pump 8 and further sent from the ozone oxidizing water suction port 35A to the gas-liquid stirring mixing tank 36A. Further, the ozone gas generated by the ozone generator 21 is pressure-fed by the compressor 22 to the gas-liquid stirring and mixing device 36A through the ozone pipe 23A. Here, the ozone gas and the raw water are mixed and stirred to form fine ozone gas bubbles, and are gas-liquid condensed and mixed, and are sent to the lower side of the primary rotary reaction separation cylinder 32 provided inside the primary negative pressure type reaction separation tank 31. It is blown out from the gas-liquid outlet 37A. The gas-liquid mixed water mixed with this ozone gas is referred to as primary gas-liquid mixed water. The blown gas-liquid mixed water is swirling and diffusing, and as described above, the swirling speed is made higher than the floating speed of ozone bubbles, so that the efficient contact reaction between ozone gas and raw water in the negative pressure type reaction separation tank. Is possible. In this way, the primary gas-liquid mixed water is subjected to contact reaction separation with ozone, and is sent to the primary reaction separation tube 32 through the punching plate 38 having holes in stages. The primary gas-liquid mixed water that has passed through the punching plate 38 in the primary reaction separation cylinder 32 is sent from the ozone-oxidized water suction port 35B to the gas-liquid stirring / mixing tank 36B. In the gas-liquid stirring and mixing tank 36B, the sucked primary gas-liquid mixed water is mixed with the exhaust ozone gas from the exhaust ozone pipe 51A,
Let this gas-liquid mixed water be secondary gas-liquid mixed water. The secondary gas-liquid mixed water is blown out above the primary rotary reaction separation cylinder 32 from the gas-liquid outlet 37B. The angle of the gas-liquid outlet 37B is adjusted so as to swirl like the gas-liquid outlet 37A. The secondary gas-liquid mixed water promotes catalytic reaction separation while rotating and diffusing in vortex flow.

The gas-liquid mixed water overflowing from the upper part of the primary rotary reaction separation cylinder 32 is located above the punching plate 39 provided in the middle between the primary negative pressure type reaction separation tank 31 and the primary rotary reaction separation cylinder 32. Accumulate in. On the other hand, the ozone oxide generated by the ozone oxidation reaction adheres to the fine bubbles by the vortex rotation diffusion effect, expansion, and ozone oxidation effect, and is floated and separated by the buoyancy. The floated and separated ozone oxide flows to the foam discharge ozone recovery tower 25A. The treatment of the floated and separated oxide is performed by the recovery concentration tank 11 and the defoaming pump 2 described later.
6, and the defoaming circulation is performed with the foam discharge ozone recovery tower 25A.

The secondary gas-liquid mixed water accumulated above the punching plate 39 is sucked through the ozone-oxidized water suction port 35C and sent to the gas-liquid stirring / mixing tank 36C. Gas-liquid stirring mixing tank 36C
As a result, the fine exhaust ozone gas from the exhaust ozone pipe 51B and the gas-liquid mixture are stirred. This gas-liquid mixed water is referred to as tertiary gas-liquid mixed water. The tertiary gas-liquid mixed water is blown from the gas-liquid outlet 37C to the primary negative pressure type reaction separation tank 31. Gas-liquid outlet 37C
As with the gas-liquid outlet 37A, the angle is adjusted so that the ejected liquid swirls. The tertiary gas-liquid mixed water is vortexed and agitated to further promote the oxidation reaction with ozone,
Floating separation is performed by causing a reaction separation action with ozone oxide.

The tertiary gas-liquid mixed water having been subjected to the floating separation is sent to the lower part of the punching plate 39 provided between the primary negative pressure type reaction separation tank 31 and the primary rotary reaction separation cylinder 32, and the ozone oxidizing water is sucked in. Gas-liquid stirring and mixing tank 36D that is sucked in through the mouth 35D
Sent to. In the gas-liquid stirring / mixing tank 36D, the sucked gas-liquid mixed water is generated by the ozone generator 21, and the ozone pipe 23B is generated.
It is gas-liquid mixed with the ozone that has passed through. The gas-liquid mixed water generated in this process is referred to as the fourth gas-liquid mixed water. The fourth gas-liquid mixed water is blown out from the gas-liquid outlet 37D. Similarly to the gas-liquid outlet 37A, the gas-liquid outlet 37D is also adjusted in angle so that the liquid to be blown out swirls. The quaternary gas-liquid mixed water is blown out to the lower part of the primary negative pressure type reaction separation tank 31 and is vortex-rotated and agitated to further promote the oxidation reaction with ozone to cause a reaction separation action with ozone oxide to perform floating separation. . In the primary reaction separation tank 31, the gas-liquid mixed solution is
From inside to outside of the rotary reaction separation cylinder 32 in the reaction separation tank 31
It's flowing.

The separated liquid is sent to the secondary negative pressure type reaction separation tank 41 through the water supply pipe 9 provided in the lower part of the primary negative pressure type reaction separation tank 31. The structure of the secondary negative pressure type reaction separation tank 41 is basically the same as that of the above-mentioned primary negative pressure type reaction separation tank 31. Oxidized water treated in the primary negative pressure type reaction separation tank 31 of the concentrated excess sludge is gradually rotated along the arrow drawn in the secondary negative pressure type reaction separation tank 41 of FIG.
It is sent to and vortexed and rotated and diffused. At this time, the treated water is
In the gas-liquid stirring / mixing tanks 43A and 43D, the ozone generator 21 is used.
The ozone gas that has passed through the ozone pipes 23D and 23C from the above is respectively gas-liquid stirred and mixed with the exhaust ozone gas in the gas-liquid stirring and mixing tanks 43B and 43C. As a result, the reaction efficiency with ozone gas is enhanced, and the bacteriolytic action, decolorizing action, auto-oxidizing action and deodorizing action are forcibly performed, and the amount of concentrated excess sludge is reduced by 90% or more. The remaining ozone oxide has a high concentrating property and is dehydrated by a conventional dehydrator.
In addition, in order to enable oxidation by ozone in a short time, and to prevent over-aeration and over-lysing bacteria caused by direct outflow of residual ozone in ozone-oxidized water to the aeration tank, the amount and load of raw water inflow are supported. The amount of treated water is configured to be able to be fed from the secondary negative pressure type reaction separation tank 41 to the mixing adjustment tank 6 via the outflow pipe 10. In the secondary reaction separation tank 41
Is the rotary reaction separation of the gas-liquid mixture in the secondary reaction separation tank 41.
It flows from the outside to the inside of the cylinder 42.

Foam from each reaction separation tank produced in the above process is circulated and recovered while performing a defoaming action by the defoaming pump 26 connected to the collecting and concentrating tank 11 by the foam collecting and discharging ozone towers 25A and 25B. In the recovery concentration tank 11, the ozone oxidation product is concentrated and settles, but due to the deodorizing effect of exhaust ozone, it becomes an odorless ozone oxidation product having a high aggregation and sedimentation property. The concentrated ozone oxidation product generated in the recovery concentration tank 11 is sent to the concentrated sludge storage tank 13 via the outflow pipe 12 and is subjected to solid-liquid separation, and is then made into excess sludge having high dehydration efficiency.

As described above, the contact efficiency due to the refinement of ozone gas, the condensing vortex flow rotation diffusion circulation action, the use of waste ozone, and the mixing of the inflowing raw water and the oxidation-treated water allow a large amount of organic and hardly decomposable drainage with a small amount of energy. The load can be reduced / deodorized safely and stably.

The ozone-treated water from the negative pressure type reaction separator is sent to the mixing and adjusting tank 6, and the raw water from the raw water adjusting tank 2 and the ozone-treated water are mixed. Since the ozone-treated water is in a state in which ozone is sufficiently and uniformly dissolved, by mixing the ozone-treated water with the raw water in the mixing adjustment tank 6,
Residual ozone in the ozone-treated water reacts with the raw water to oxidize, decompose, sterilize, and deodorize the raw water. The residual ozone can be effectively used in this way, and the load of raw water can be sufficiently reduced. The mixing adjustment tank 6 is provided with an exhaust ozone pipe 24 and a gas-liquid agitating / mixing device 7 so that exhaust ozone gas generated during ozone reaction in the primary and secondary negative pressure type reaction separation tanks can be collected and used. May be. In this case, the mixed water of the raw water, the ozone-treated water, and the discharged ozone are sent to the gas-liquid stirring / mixing device 7 where they are gas-liquid mixed and stirred, and again sent into the mixing adjustment tank 6. In this way, ozone gas, ozone-treated water, and raw water are mixed.

The mixed water of the raw water and the ozone-treated water which has been mixed in the mixing adjustment tank 6 and whose load has been reduced (hereinafter referred to as raw water mixed water) is sent to the biological treatment tank (aeration tank) 61 for active biological treatment. Decomposed by law.

In the above steps, the concentration of ozone gas, the amount of raw water to be mixed with the ozone-treated water in the mixing adjusting tank 6 and the like can be changed depending on the ability of the biological treatment tank (aeration tank) 61 to decompose microorganisms. For example, when the decomposition capacity of the biological treatment tank (aeration tank) 61 is close to the limit, it is necessary to reduce the load of the raw water mixed water sent from the mixing adjustment tank 6 to the biological treatment tank (aeration tank) 61. To this end, the ozone concentration is increased in each negative pressure type reaction separation tank to accelerate the oxidative decomposition reaction to reduce the load, and the ozone concentration of the ozone-treated water sent to the mixing adjustment tank 6 is increased, or the raw water adjustment tank 2 is used. Take measures such as reducing the amount of raw water sent from On the contrary, when the biological treatment tank (aeration tank) 61 has a sufficient decomposition ability, the ozone concentration is lowered in each negative pressure type reaction separation tank to slightly suppress the oxidative decomposition reaction to increase the load, and the mixing adjustment tank. The ozone concentration of the ozone-treated water sent to 6 may be lowered, or the amount of raw water sent from the raw water adjusting tank 2 may be increased. Further, it is possible to take the above-mentioned treatment in order to make the load on the biological treatment tank (aeration tank) 61 constant.

As described above, the easily degradable and stable low-load wastewater, the wastewater in which various germs are suppressed, and the wastewater containing fine bubbles of residual oxygen can activate the microorganisms, and thus can be treated by biological treatment. Can be done efficiently. Further, by feeding such wastewater to the aeration tank, it is possible to suppress fluctuations in the load on the aeration tank, and it is possible to safely and stably dispose of an increase in the amount of raw inflow water with less energy.

The waste water treated in the biological treatment tank (aeration tank) 61 is sent to the settling tank 62. As described above, the flocs of the microorganisms flowing from the biological treatment tank (aeration tank) 61 are precipitated in the settling tank 62, the supernatant liquid is discharged as it is, and the solid components such as the flocs of the precipitated microorganisms are regularly taken out. It is then dehydrated and then disposed of.

In this process, the liquid content may be discharged as usual and the solid content may be dehydrated and discarded, as shown in FIG.
As shown in, the sludge accumulated in the lower part of the settling tank can be sent to the primary negative pressure type reaction separation tank 71 and the secondary negative pressure type reaction separation tank 72, subjected to ozone oxidation treatment, and then subjected to a dehydrator. Here, the structure and operation of the primary negative pressure type reaction separation tank 71 and the secondary negative pressure type reaction separation tank 72 are basically the same as those of the primary negative pressure type reaction separation tank 31 and the secondary negative pressure type reaction separation tank 32 described above. The sludge sent from the settling tank 62 is gas-liquid agitated and mixed with ozone gas, swirled and rotationally diffused in each negative pressure type reaction separation tank, and floated to separate the ozone oxide and the liquid. It is possible to reduce the amount of sludge to about 1/10 as compared with that before the treatment by lysing, decolorizing and deodorizing. The separated solid content is then sent to the dehydrator 63 and processed into a cake by dehydration treatment. The ozone-oxidized treated water is returned to the concentrated sludge storage tank connected to the negative pressure type reaction separation tank for reuse.

The above is one embodiment for explaining the present invention, and it goes without saying that the present invention is not limited to this example.

The fine ozone bubbles diffused into the reaction separation tank by the gas-liquid mixing and stirring apparatus described above will be described by a concrete example in comparison with a conventional example.

(A) The size of conventional ozone bubbles is "2 to
3 mmφ ", the size of the ozone bubble of the present invention is" 0.01 "
mmφ ”, (b) the surface area S of a conventional ozone bubble,
When the volume P is calculated, S = 4πr ² = 4 × 3.14 × (2 to 3) ² = 50.24 to 113.04 mm ² P = 4πr ³ /3=4×3.14×(2 to ³ ) ^{3/3 = 33.49~113.0mm 3 (c} ) surface area S of the ozone bubbles of the present invention, when calculating the volume ^{P, S = 4πr 2 = 4} × 3.14 × (0.01) 2 = 0. 0l
256 mm ² P = 4πr ³ /3=4×3.14×(0.01) ³ /3=0.00000041 mm ³ (d) The increase in surface area is 50.24 ÷ 0.01256 = 4,000 times 113. 04 / 0.01256 = 9,000 times (e) 0.01 m of one ozone bubble with a diameter of 2 to 3 mm
Compared to the volume of one mφ ozone bubble, the diameter is 2 mm
In the case of φ, N = 33.49 ÷ 0.0000041 = 8,000,000 pieces When the diameter is 3 mmφ, N = 113.04 ÷ 0.0000041 = 27,000,000 pieces As described above, When ozone bubbles are diffused in the concentrated excess sludge water from the gas-liquid agitation mixing device of No. 1, the surface area is increased 4,000 to 9,000 times as compared with the conventional one, and the contact area with water is significantly increased. Buoyancy is small due to the fine bubbles, and the residence time in water is lengthened, and at the same time, the contact flow efficiency is increased by the turbulent wave number due to the vortex flow by rotating the water flow stepwise in a vortex shape. By reusing waste ozone, it is possible to effectively oxidize and decompose organic and refractory wastewater in a short time with low energy, and adjust the amount of ozone oxidation and the mixing ratio of raw water for exposure. The improvement of the processing capability of a bath, stably performed is possible.

[0031]

As described above, according to the method and apparatus of the present invention, fine ozone is added to raw water by vortex rotary diffusion in a negative pressure type reaction separation tank equipped with one or more gas-liquid stirring and mixing devices. The contact efficiency, residence time, and dissolution rate of air bubbles are increased, the ozone oxidative decomposition action is effectively performed efficiently, the miscellaneous bacteria are treated by ozone oxidative decomposition, and the easily decomposable substance is made to be easily degradable substance. Therefore, the efficiency of reducing the load of the inflowing substance can be increased, and the ozone concentration in the raw water can be further increased. By mixing such ozone-treated water and raw water, it is possible to reduce the load of raw water to the extent that biological activity can be treated. As a result, the residual oxygen in the ozone-treated water promotes the activity of the organisms, the treatment effect in the biological treatment tank (aeration tank) is increased, and the treatment amount can be increased. The throughput in the final settling basin is increased.
Further, the dehydration efficiency of the excess sludge and the concentrated ozone oxide is increased, and it becomes possible to improve the quality of treated water and increase the amount of treated water in the biological treatment method with a small amount of energy.

[Brief description of drawings]

FIG. 1 is a diagram showing the flow of a method and system for treating organic and hardly decomposable wastewater with ozone of the present invention.

FIG. 2 is a diagram showing the flow of a method and system for treating organic and hardly decomposable wastewater with ozone of the present invention.

FIG. 3 is a side cross-sectional view of an apparatus for performing the method of the present invention.

FIG. 4 is a plan sectional view of an apparatus for carrying out the method of the present invention.

[Explanation of symbols]

1 Raw water inflow pipe 2 Raw water adjustment tank 3 water pump 4 Raw water transmission pipe 5 mixed water pipe 6 Mixing adjustment tank 7 Gas-liquid stirring and mixing device 8 water pump 9 water pipe 10 Outflow pipe 11 Recovery and concentration tank 12 Outflow pipe 13 Concentrated sludge storage tank 21 Ozone generator 22 Compressor 23A-23D Ozone Tube 24 Exhaust ozone pipe 25A-25B Foam recovery exhaust ozone tower 26 Defoaming pump 31 Primary negative pressure type reaction separation tank 32 Primary rotation reaction separation cylinder 35A-35D Ozone-oxidized water suction port 36A-36D Gas-liquid stirring mixing tank 37A-37D Gas-liquid outlet 38 Punching board 39 Punching board 41 Secondary negative pressure type reaction separation tank 42 Secondary rotation reaction separation cylinder 43A-43D Gas-liquid mixing tank 51A-51B Exhaust ozone pipe 52A-52B Exhaust ozone pipe 61 Biological treatment tank (aeration tank) 71 Primary negative pressure type reaction separation tank 72 Primary rotation reaction separation cylinder

─────────────────────────────────────────────────── ─── Continuation of front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) C02F 1/78 C02F 3/12 C02F 11/06

Claims (6)

(57) [Claims] 1. An organic, hardly decomposable wastewater is supplied to a mixing adjustment tank, and the organic, hardly decomposable wastewater is supplied from the mixing adjustment tank to a reaction separation tank to which a gas-liquid stirring and mixing device is connected. From the reaction separation tank to the gas-liquid stirring and mixing device, the organic property,
Along with sending hardly-decomposable wastewater, ozone gas is supplied to the gas-liquid stirring and mixing device to concentrate and mix gas-liquid to form a gas-liquid mixed liquid, and the gas-liquid mixed liquid is swirled in the reaction separation tank.
And refluxed to diffuse, by separating the oxidation product and a liquid, and returning the separated liquid into the mixing adjustment tank, organic supplied to newly the mixing adjusting tank, a hardly decomposable waste water A method for treating organic and hardly decomposable wastewater with ozone, which is configured to stir and mix the separated liquid in the mixing adjustment tank, wherein a plurality of gas-liquid stirring and mixing devices are provided, and A rotary reaction separation cylinder is placed inside the reaction separation tank, and
A punching plate is placed between the transfer reaction separation cylinder and
A punching plate is placed inside the reaction separation cylinder, and the organic and persistent decomposition wastewater is separated from the reaction separation tank by the rotary reaction separation.
The punching plate between the cylinder and the inner wall of the rotary reaction separation cylinder.
A gas-liquid stirring / mixing device connected to the inside of the rotary reaction separation cylinder and the gas connected to the outside of the rotary reaction separation cylinder so that the organic and hardly decomposable waste water passes through the cooling plate. Ozone gas is gas-liquid concentrated and mixed by a liquid stirring and mixing device, so that vortex rotation diffusion is performed.
A method for treating organic and persistent degradable wastewater by ozone, which is characterized in that the wastewater is sent to . 2. A raw water adjusting tank, a mixing adjusting tank, a biological treatment tank,
And an organic waste treatment method using an activated sludge treatment system equipped with a settling tank, wherein an organic, hardly decomposable wastewater is supplied to a mixing adjustment tank, and the reaction separation tank connected to a gas-liquid stirring mixing device Supplying organic and refractory wastewater from the mixing adjustment tank, sending the organic and refractory wastewater from the reaction separation tank to the gas-liquid stirring mixer, and supplying ozone gas to the gas-liquid stirring mixer. Then, the mixture is concentrated and mixed to form a gas-liquid mixture, and the gas-liquid mixture is refluxed in the reaction separation tank so as to be swirling and rotationally diffused , and the oxidation product and the liquid are separated, and the separated. The liquid is returned to the mixing adjusting tank, and the organic and non-decomposable wastewater newly supplied to the mixing adjusting tank from the raw water adjusting tank and the separated liquid are stirred and mixed in the mixing adjusting tank. And the organic and persistent decomposition drainage The load is reduced, and the organic and non-decomposable wastewater with reduced load is sent to the biological treatment tank for biological treatment and then supplied to the sedimentation tank, and the sludge accumulated in the lower part of the sedimentation tank is a gas-liquid agitation mixing device. Is supplied to the connected reaction separation tank, and the sludge is sent from the reaction separation tank to the gas-liquid stirring / mixing device, and ozone gas is supplied to the gas-liquid stirring / mixing device to mix to form a gas-liquid mixed liquid. A method for treating organic and hardly decomposable wastewater by ozone, wherein the gas-liquid mixed liquid is refluxed to the reaction separation tank to separate an oxidation product and a liquid to reduce / deodorize sludge. , A plurality of the gas-liquid stirring and mixing devices connected to the reaction separation tank supplied with the organic and hardly decomposable waste water from the mixing adjustment tank, and a rotary reaction separation cylinder is arranged inside the reaction separation tank and, the reaction separation vessel and the rotational reaction Between the separating cylinder
Place the punching plate on the inside of the rotary reaction separation cylinder.
Arranging a punching plate, the organic and persistent water is
Pantin between the reaction separation tank and the rotary reaction separation cylinder
Passing through the punching plate and the punching plate in the rotary reaction separation cylinder
And organic, hardly decomposable waste water, the gas-liquid stirring and mixing device connected to the inside of the rotary reaction separation cylinder, and the gas-liquid stirring and mixing device connected to the outside of the rotary reaction separation cylinder Ozone gas and gas-liquid are concentrated and mixed by vortex flow
A method for treating organic and persistent degradable wastewater by ozone, which is characterized in that the wastewater is sent to . 3. A gas-liquid stirring / mixing device is installed in the mixing adjusting tank, and exhaust ozone gas generated in the gas-liquid stirring / mixing process in the gas-liquid mixing / stirring device connected to the reaction separating tank is discharged into the reaction separating tank. The gas-liquid stirring / mixing device installed in the above, and / or the gas-liquid stirring / mixing device installed in the above-mentioned mixing adjusting tank, and the exhaust ozone gas is reused, and the organic property by ozone according to claim 1, Method of treating persistent wastewater. 4. A gas-liquid stirring / mixing process in the gas-liquid mixing / stirring apparatus, wherein a gas-liquid stirring / mixing apparatus is installed in the mixing / adjusting tank and is connected to the reaction separation tank for treating wastewater from the mixing / adjusting tank. The reaction separation tank for treating the sludge from the settling tank by supplying the exhaust ozone gas generated in 1) to the gas-liquid stirring / mixing apparatus installed in the reaction separation tank and / or the gas-liquid stirring / mixing apparatus installed in the mixing adjustment tank. A gas-liquid stirring / mixing device in which the exhaust ozone gas generated in the gas-liquid stirring / mixing process in the gas-liquid mixing / stirring device connected to
And / or the method for treating organic and hardly decomposable waste water with ozone according to claim 2, wherein the waste ozone gas is supplied to the gas-liquid stirring / mixing device installed in the mixing adjusting tank to reuse the waste ozone gas. 5. A raw water adjusting tank, a mixing adjusting tank, a biological treatment tank,
In the activated sludge treatment system including a settling tank, a reaction separation tank connected to the mixing adjustment tank, a rotary separation cylinder arranged inside the reaction separation tank, and a rotary separation cylinder that is provided around the reaction separation tank. An ozone supply device for supplying ozone to a plurality of gas-liquid stirring and mixing devices connected to the inside of the separation cylinder and the outside of the rotary separation cylinder, and an organic, hardly decomposable wastewater in the reaction separation tank. Means for supplying from the mixing adjustment tank, supply / reflux means for mutually supplying / refluxing the organic, hardly decomposable wastewater and ozone mixed liquid between the reaction separation tank and the gas-liquid agitation mixing device, and ozone Means for returning the treated organic, hardly decomposable wastewater to the mixing and adjusting tank, and the ozone-treated organic, hardly decomposable wastewater and the organic, freshly sent from the raw water adjusting tank Stir-mix with degradable wastewater The organic, later with reducing the load of the hardly decomposable waste water, organic by ozone and means for supplying the waste water with reduced the load to the biological treatment tank
Sex, a processing system hardly decomposable waste water, is connected a plurality of gas-liquid stirring and mixing device, a rotary reaction separating cylinder
Supplying organic and non-decomposable wastewater to the built-in reaction separation tank
From the reaction separation tank to the gas-liquid stirring and mixing device.
Mechanical and hard-to-decompose wastewater is sent, and the gas-liquid stirring and mixing equipment
By supplying ozone gas to the container and mixing it by gas-liquid concentration,
As a gas-liquid mixture, swirl the gas-liquid mixture into the reaction separation tank.
Reflux to rotate and diffuse to separate the oxidation product and liquid.
Separate to reduce the load / deodorization of the organic and persistent water.
The first reaction separation tank and the first reaction separation tank
Two reaction separation tanks are connected in series, and in the first reaction separation tank, the gas-liquid mixed solution is used for the first reaction.
Rotation reaction inside the separation tank
After passing through the punching plate in the separation cylinder,
The reaction separation tank and the rotary reaction separation cylinder overflowing from the separation cylinder.
Flow through a punching plate between
And the second reaction separation tank is fed from the first reaction separation tank.
The gas-liquid mixed liquid coming in is rotated in the second reaction separation tank.
The reaction separation tank and the rotation
The rotation reaction through the punching plate between the separation cylinder
Punching in the rotation reaction separation cylinder by overflowing into the separation cylinder
Before configured to swirl through the plate to rotate and diffuse
A system for treating organic and persistent decomposition wastewater using ozone , which incorporates a reaction separation tank . 6. A raw water adjusting tank, a mixing adjusting tank, a biological treatment tank,
In an activated sludge treatment system including a settling tank and a dehydrator, a reaction separation tank connected to the mixing adjustment tank, a rotary separation cylinder arranged inside the reaction separation tank, and the reaction separation tank are provided around the reaction separation tank. An ozone supply device that supplies ozone to a plurality of gas-liquid stirring and mixing devices connected to the inside of the rotary reaction separation cylinder and the outside of the rotation separation cylinder, and an organic supply to the reaction separation tank. Means for supplying organic wastewater from the mixing adjustment tank, and supply / reflux means for mutually supplying / refluxing the organic, hardly decomposable wastewater and ozone mixed liquid between the reaction separation tank and the gas-liquid stirring / mixing device. And a means for returning the ozone-treated organic and hardly decomposable wastewater to the mixing adjustment tank, and the ozone-treated organic and hardly decomposable wastewater and the organic material newly sent from the raw water adjustment tank Water and persistent water And a means for supplying the wastewater having the reduced load to the biological treatment tank after mixing to reduce the load of the organic and persistent decomposition wastewater, and the wastewater treated in the biological treatment tank Means for supplying to the precipitation tank, a reaction separation tank connected to the precipitation tank, the ozone supply device for supplying and mixing ozone to a gas-liquid agitation mixing device provided around the reaction separation tank, and the reaction Means for supplying sludge accumulated in the lower part of the settling tank to the separation tank, and supply / reflux of the sludge and ozone mixed solution to / from each other between the reaction separation tank and the gas-liquid agitation mixing device
Organic, hardly decomposed by ozone, which is provided with a reflux means and a means for supplying the ozone-treated sludge to the dehydrator.
This is a system for treating effluent, in which multiple gas-liquid agitation mixers are connected and a rotary reaction separation
Supplying organic and non-decomposable wastewater to the built-in reaction separation tank
From the reaction separation tank to the gas-liquid stirring and mixing device.
Mechanical and hard-to-decompose wastewater is sent, and the gas-liquid stirring and mixing equipment
By supplying ozone gas to the container and mixing it by gas-liquid concentration,
As a gas-liquid mixture, swirl the gas-liquid mixture into the reaction separation tank.
Reflux to rotate and diffuse to separate the oxidation product and liquid.
Separate to reduce the load / deodorization of the organic and persistent water.
The first reaction separation tank and the first reaction separation tank
Two reaction separation tanks are connected in series, and in the first reaction separation tank, the gas-liquid mixed solution is used for the first reaction.
Rotation reaction inside the separation tank
After passing through the punching plate in the separation cylinder,
The reaction separation tank and the rotary reaction separation cylinder overflowing from the separation cylinder.
Flow through a punching plate between
In the second reaction separation tank, the gas-liquid mixed solution sent from the first reaction separation tank is transferred from the outer side to the inner side of the rotary reaction separation cylinder in the second reaction separation tank to the reaction separation tank. The reaction configured to flow through a punching plate between the rotary reaction separation cylinder and overflow into the rotary reaction separation cylinder, and through a punching plate in the rotary reaction separation cylinder to cause vortex rotation diffusion to flow. A system for treating organic and hardly decomposable wastewater using ozone, which is characterized by incorporating a separation tank.