JP4861383B2 - Organic sludge ozone treatment equipment - Google Patents

Description

  The present invention is an organic sludge that effectively uses and reduces the volume of organic sludge such as primary sludge and excess sludge discharged from sewage treatment processes such as sewage treatment facilities and sewage treatment facilities. The present invention relates to an ozone treatment apparatus.

  When municipal sewage or organic industrial wastewater is purified by the activated sludge method, a large amount of sludge called primary sludge or surplus sludge is generated. The first settling sludge consists of solids that settle naturally in the first settling basin, which is the first facility to receive sewage. The surplus sludge is the remaining part of the activated sludge that has been treated by activated sludge in the aeration tank and then separated into the final sedimentation basin, excluding the part that is returned to the aeration tank as return sludge. It is made up of microorganisms grown using dissolved organic matter as a substrate.

  The amount of sewage sludge generated has increased at a rate of 5% per year with the recent sewerage development. The amount is 1.5 million tons / year in terms of dry weight and the final disposal amount is 200-250. It reaches 10,000 tons / year. Although 70% of these sewage sludge is disposed of in landfills, the final disposal sites, which have only a few years remaining, account for the majority.

  As a measure to reduce sewage sludge to be treated, disposal methods have been studied and put into practical use in the direction of volume reduction, energy recovery, materialization, dark green area reduction, etc., but such effective use is sludge that has been disposed of in landfills. It remains at a ratio of about 20% to the amount.

  One method for effectively using sludge is to treat the sludge by an anaerobic digestion method. The anaerobic digestion method of sludge has advantages such as obtaining methane that can be used as a fuel, low energy consumption, and high killing rate of pathogenic bacteria. The anaerobic digestion process of sludge consists of (1) hydrolysis stage or solubilization stage (2) acid generation stage (3) methane formation stage. In these three linkage processes, it has been pointed out that elution of intracellular high molecular substances such as proteins, nucleic acids, lipids and carbohydrates and the lowering of the molecular weight by hydrolysis of these substances is the rate-determining step and requires a long digestion period. . Therefore, in order to solubilize biodegradable organic substances in organic sludge and improve digestion efficiency, sludge pretreatment using ozone is performed.

  FIG. 17 is a configuration diagram showing an example of a conventional organic sludge ozone treatment apparatus.

  As shown in FIG. 17, the conventional organic sludge ozone treatment apparatus includes an ozone generator 1 that generates an ozone-containing gas, and an ozone reaction in which the ozone-containing gas and treated sludge (organic sludge) 3 are in gas-liquid contact. And a tank 2.

In FIG. 17, the ozone treatment tank 2 is filled with the treated sludge 3, the ozone-containing gas 4 is introduced into the treated sludge and brought into gas-liquid contact, and the organic sludge is oxidatively decomposed.
That is, the treated sludge filled in the ozone reaction tank 2 comes into contact with the ozone-containing gas 4 introduced from the lower part of the ozone reaction tank 2 to form a liquid phase region 5 and is oxidatively decomposed.

  As the decomposition progresses, the treated sludge foams and slowly rises above the ozone reaction tank 2 while forming the foam region 6 above the liquid phase region 5 as the ozone-containing sludge 7.

  The contact between the ozone-containing gas 4 and the treated sludge 3 can be performed until the ozone-containing sludge 7 reaches the upper part of the ozone reaction tank 2.

  After ozone treatment for a certain time, the ozone-containing gas 4 from the ozone generator 1 is stopped. Next, after the foaming is sufficiently settled, the ozone-containing sludge is discharged from the ozone reaction tank 2. Ozone-treated organic sludge is put into a biological treatment tank, such as an anaerobic digestion tank, and decomposed by microorganisms.

  Conventional ozone treatment apparatuses have a problem that the gas-liquid contact volume is small, and in order to obtain a sufficient treatment effect, the amount of ozone that is relatively expensive to manufacture is increased and the treatment cost is increased.

  In order to reduce the amount of ozone added as much as possible and obtain a sufficient treatment effect, it has been considered to reduce the flow rate of ozone to be introduced and increase the contact time with respect to a certain amount of ozone added.

  For example, when considering the treatment of organic sludge combining ozone treatment and anaerobic digestion method, considering the treatment time of anaerobic digestion, even if ozone treatment is performed for 24 hours, The ozone treatment of the process does not become the rate limiting step. In conventional ozone treatment, ozone treatment is performed in about 30 to 120 minutes, and it is difficult to perform ozone treatment in such a long time in order to reduce the amount of ozone added.

  The present invention has been made in consideration of such points, and an object thereof is to provide an organic sludge ozone treatment apparatus capable of oxidizing and decomposing organic sludge with a smaller amount of ozone added than before. To do.

  In the present invention, organic sludge is supplied, ozone gas is introduced into the organic sludge from below, and an ozone reaction tank for ozone treatment as ozone-containing sludge, and ozone-containing sludge flowing out from the ozone reaction tank are stored. A sludge receiving tank is provided, and the ozone reaction tank is located below and has a liquid phase region in which ozone gas is in gas-liquid contact with the organic sludge, and the organic sludge formed above the liquid phase region is foamed. Ozone of organic sludge characterized by having a foam area where ozone-containing sludge stays and an overflow area where the foamed ozone-containing sludge formed above the foam area overflows toward the sludge receiving tank side It is a processing device.

  ADVANTAGE OF THE INVENTION According to this invention, the ion containing sludge which flows out from an ozone reaction tank can be stored in a sludge receiving tank, and the oxidative decomposition of an ion containing sludge can be advanced more reliably.

  As described above, according to the present invention, organic sludge can be oxidatively decomposed with a smaller amount of ozone added than before, and biologically combined with the sludge reduction method, it is more effective and economical. The amount of organic sludge can be reduced.

DESCRIPTION OF EXEMPLARY EMBODIMENTS First Embodiment Hereinafter, an embodiment of the invention will be described with reference to the drawings. FIG. 1 is a diagram showing an organic sludge ozone treatment apparatus according to the present invention.

  In FIG. 1, an organic sludge ozone treatment apparatus includes an ozone reaction tank 12 that supplies ozone to be treated (organic sludge) 11 from above and performs ozone treatment, and an ozone-containing gas ( An ozone generator 14 for introducing ozone gas) 13 and a sludge receiving tank 16 for storing ozone-containing sludge 15 flowing out from the upper part of the ozone reaction tank 12.

  In the ozone reaction tank 12, an ozone-containing gas 13 is introduced into the organic sludge 11 from the lower part of the ozone reaction tank 12 to bring it into gas-liquid contact, and the liquid phase area 17 is located above the liquid phase area 17 and contains ozone. The ozone 13 containing sludge 15 formed by foaming the treated sludge 11 by introducing the gas 13 is retained, and the ozone-containing sludge 15 located above the foam 18 is foamed into the sludge receiving tank 16 side. An overflow area 19 is formed to flow out into the area.

  Next, the operation of the present embodiment having such a configuration will be described.

  The treated sludge (organic sludge) 11 introduced from the upper part of the ozone reaction tank 12 comes into contact with the ozone-containing gas (ozone gas) 13 introduced from the lower part of the ozone reaction tank 12, and the liquid phase region 17 is changed. It is formed and oxidatively decomposed.

  As the decomposition progresses, the treated sludge 11 foams and slowly rises to the top of the ozone reaction tank 12 while forming the foam region 18 above the liquid phase region 17 as the ozone-containing sludge 15. Eventually, the ozone-containing sludge 15 that has reached the overflow area 19 flows out into the sludge receiving tank 16 and is stored. The contact between the ozone-containing gas 13 and the treated sludge 11 can be performed until the ozone reaction tank 12 is filled with the treated sludge. Further, the contact between the ozone-containing gas 13 and the treated sludge 11 can be performed for a period of time until the ozone-containing sludge 15 reaches the upper part of the ozone reaction tank 12.

  After performing ozone treatment for a certain period of time, the ozone generator 14 is stopped, and after the foaming in the ozone reaction tank 12 is sufficiently settled, the ozone-containing sludge 15 is discharged from the sludge receiving tank 16. The ozone-containing sludge 15 that has been subjected to the ozone treatment is then put into a biological treatment tank, such as an anaerobic digestion tank, and decomposed by microorganisms.

  According to the present embodiment, the foam region 18 and the overflow region 19 are formed inside the ozone reaction tank 12, and the ozone-containing sludge 15 is caused to flow out from the upper part of the ozone reaction tank 12 and stored in the sludge receiving tank 16. In addition, the contact time between the organic sludge 11 and the ozone-containing gas 13 can be lengthened, and a sufficient treatment effect can be obtained with a smaller amount of ozone added than before.

Second Embodiment Next, a second embodiment of the present invention will be described with reference to FIG. The second embodiment shown in FIG. 2 is provided with a return pipe 20a having a return pump 20, and the others are substantially the same as the first embodiment shown in FIG. In FIG. 2, the same parts as those of the first embodiment shown in FIG.

  As shown in FIG. 2, the ozone-containing sludge 15 is returned from the sludge receiving tank 16 to the ozone reaction tank 12 between the lower part of the sludge receiving tank 16 storing the ozone-containing sludge 15 and the upper part of the ozone reaction tank 12. A return pipe 20a is connected, and a return pump 20 is provided in the return pipe 20a.

  In FIG. 2, the treated sludge 11 introduced from the upper part of the ozone reaction tank 12 comes into contact with the ozone-containing gas 13 introduced from the lower part of the ozone reaction tank 12 to form a liquid phase region 17 and oxidative decomposition. Is done.

  As the decomposition progresses, the treated sludge 11 foams and slowly rises to the top of the ozone reaction tank 12 while forming the foam region 18 above the liquid phase region 17 as the ozone-containing sludge 15. Eventually, the ozone-containing sludge 15 that has reached the overflow area 19 flows out to the sludge receiving tank 16 and is stored, and is returned again to the ozone reaction tank 12 by the return pump 20 and processed while circulating. After performing ozone treatment for a certain period of time, the ozone generator 14 is stopped, and after the foaming in the ozone reaction tank 12 is sufficiently settled, the ozone-containing sludge 15 is discharged from the sludge receiving tank 16. The ozone-containing sludge 15 that has been subjected to ozone treatment is put into a biological treatment tank, such as an anaerobic digestion tank, and decomposed by microorganisms.

  According to the present invention, the contact time between the organic sludge 11 and the ozone-containing gas 13 can be increased by returning the ozone-containing sludge 15 from the sludge receiving tank 16 to the ozone reaction tank 12, which is less than before. A sufficient treatment effect can be obtained with the added amount of ozone.

Third Embodiment FIG. 3 is a block diagram showing a third embodiment of the present invention. In FIG. 3, the same parts as those of the embodiment shown in FIG.

  As shown in FIG. 3, a storage tank 21 that stores an antifoaming agent, acid, and alkali is connected to the sludge receiving tank 16. And by adding an antifoamer, an acid, and an alkali from the storage tank 21 to the sludge receiving tank 16, defoaming, secondary decomposition, and pH adjustment of the foamed ozone-containing sludge 15 can be performed.

  Thus, the storage tank 21 functions as an antifoam agent input part or a pH adjuster input part.

  When an antifoaming agent is added to the sludge receiving tank 16, the circulation from the sludge receiving tank 16 to the ozone reaction tank 12 can be performed smoothly.

  Further, by adding alkali as a pH adjuster from the storage tank 21 to the sludge receiving tank 16, the pH of the ozone-containing sludge 15 can be maintained at an appropriate alkaline condition. In addition, ozone treatment can be performed more efficiently, and decomposition of the organic sludge 11 can be further promoted. In this case, the alkali added from the storage tank 21 is NaOH.

Moreover, by adding an acid as a pH adjuster from the storage tank 21 to the sludge receiving tank 16, the pH of the ozone-containing sludge 15 can be maintained at an appropriate acidic condition, and the ozone treatment can be performed more efficiently. The decomposition of the organic sludge 11 can be further promoted. In this case, HCl and H ₂ SO ₄ can be applied as a pH adjuster added from the storage tank 21.

Fourth Embodiment FIG. 4 is a block diagram showing a fourth embodiment of the ozone treatment apparatus according to the present invention. The ozone treatment apparatus has substantially the same configuration as the ozone treatment apparatus shown in FIG. 2, and in FIG. 4, the same parts as those of the embodiment shown in FIG. To do.

  As shown in FIG. 4, the sludge receiving tank 22 has pressure resistance. In the sludge receiving tank 22, defoaming and secondary decomposition of the ozone-containing sludge 15 can be performed by pressurization or decompression.

  According to the present embodiment, by maintaining the sludge receiving tank 22 in a pressurized state at atmospheric pressure or higher, the ozone absorption rate can be increased, the decomposition of the ozone-containing sludge 15 is promoted, and the foamed ozone The contained sludge 15 can be defoamed, and the circulation from the receiving tank 22 to the ozone reaction tank 12 can be performed smoothly.

  Further, by keeping the sludge receiving tank 22 in a reduced pressure state below atmospheric pressure, the decomposition of the ozone-containing sludge 15 can be promoted, and the ozone-containing sludge 15 foamed in the foam region 18 can be defoamed. Circulation to the ozone reaction tank 12 can be performed smoothly.

Fifth Embodiment FIG. 5 is a block diagram showing a fifth embodiment of the ozone treatment apparatus according to the present invention. This ozone treatment apparatus has substantially the same configuration as the ozone treatment apparatus shown in FIG. 2. In FIG. 5, the same parts as those of the second embodiment shown in FIG. Description is omitted.

  As shown in FIG. 5, a piston 23 that can repeatedly pressurize and depressurize the sludge receiving tank 22 is installed inside the pressure resistant sludge receiving tank 22. In the sludge receiving tank 22, defoaming and secondary decomposition of the ozone-containing sludge 15 can be performed by repeating pressurization and pressure reduction. In addition, by increasing the ozone absorption rate, the decomposition of the organic sludge 11 can be promoted and the foamed ozone-containing sludge can be defoamed, and the circulation from the sludge receiving tank 22 to the ozone reaction tank 12 can be smoothly performed. Can be done.

Sixth Embodiment FIG. 6 is a block diagram showing a sixth embodiment of the ozone treatment apparatus according to the present invention. This ozone treatment apparatus has substantially the same configuration as the ozone treatment apparatus shown in FIG. 2, and in FIG. 6, the same parts as those of the second embodiment shown in FIG. Description is omitted.

  As shown in FIG. 6, a heat-resistant sludge receiving tank 24 is installed, and a heater 25 or a cooler 26 is installed around the sludge receiving tank 24. The ozone-containing sludge can be secondarily decomposed by heating or cooling, freezing and thawing in the sludge receiving tank 24.

  In FIG. 6, for example, by keeping the sludge receiving tank 24 in a heated state of 50 to 100 ° C., decomposition of the organic sludge 11 can be further promoted.

  Moreover, by maintaining the sludge receiving tank 24 in a cooled state of −10 to 80 ° C., it is possible to increase the ozone absorption rate and further promote the decomposition of the organic sludge 11.

  Furthermore, by performing the freezing and thawing cycle in the sludge receiving tank 24, the decomposition of the organic sludge 11 can be further promoted, and the solid-liquid separation characteristics of the treated organic sludge 11 can be improved. .

Seventh Embodiment FIG. 7 is a view showing a seventh embodiment of the ozone treatment apparatus according to the present invention. In FIG. 7, the same parts as those of the second embodiment shown in FIG.

  As shown in FIG. 7, a rotating shaft 27 having a paddle 27 a is installed in the sludge receiving tank 16, and the rotating shaft 27 is driven by a motor 30.

  By this rotating shaft 27, the foam of the ozone containing sludge 15 in the sludge receiving tank 16 can be subdivided, and the contact efficiency of the ozone containing gas 13 and the ozone containing sludge 15 can be improved.

Eighth Embodiment FIG. 8 is a view showing an eighth embodiment of the ozone treatment apparatus according to the present invention. In FIG. 8, the same parts as those of the second embodiment shown in FIG.

  As shown in FIG. 8, a stirring bar 28 driven by a motor 30 is installed in the sludge receiving tank 16.

  The stirrer 28 can subdivide the foam of the ozone-containing sludge 15 in the sludge receiving tank 16 and improve the contact efficiency between the ozone-containing gas 13 and the ozone-containing sludge 15.

Ninth Embodiment FIG. 9 is a view showing a ninth embodiment of the ozone treatment apparatus according to the present invention. In FIG. 9, the same parts as those of the second embodiment shown in FIG.

  As shown in FIG. 9, the sludge receiving tank 16 is rotationally driven by a motor 30.

  By rotating the sludge receiving tank 16, the foam of the ozone-containing sludge 15 in the sludge receiving tank 16 can be subdivided, and the contact efficiency between the ozone-containing gas 13 and the ozone-containing sludge 15 can be improved.

Tenth Embodiment FIG. 10 is a block diagram showing a tenth embodiment of an ozone treatment apparatus according to the present invention. This ozone treatment apparatus has substantially the same configuration as the ozone treatment apparatus shown in FIG. 2, and the same parts as those in the second embodiment shown in FIG. Description is omitted.

  As shown in FIG. 10, the sludge receiving tank 16 is provided with an ultrasonic generator 31 for ultrasonically treating the ozone-containing sludge. And thereby, decomposition | disassembly of organic sludge can further be accelerated | stimulated.

Eleventh Embodiment FIGS. 11 and 12 are configuration diagrams showing an eleventh embodiment of an ozone treatment apparatus according to the present invention. This ozone treatment apparatus has substantially the same configuration as the ozone treatment apparatus shown in FIG. 2, and in FIGS. 10 and 11, the same parts as those in the second embodiment shown in FIG. Detailed description will be omitted.

  As shown in FIGS. 11 and 12, a nozzle 32 (FIG. 11) for introducing the sludge returned from the sludge receiving tank 16 into the ozone reaction tank 12 into the ozone reaction tank 12 in a shower form, or a nozzle for introducing it into the inner wall. 32a (FIG. 12) is installed. And by these nozzles 32 and 32a, foaming of the organic sludge 11 in the foam area | region 18 in the ozone reaction tank 12 can be suppressed. For this reason, the contact time of the ozone containing gas 13 and the organic sludge 11 in the ozone reaction tank 12 can be lengthened.

Twelfth Embodiment Next, an ozone treatment apparatus for continuously introducing ozone-treated sludge containing ozone into a biological treatment tank will be described with reference to FIG.

  FIG. 13 is a configuration diagram showing a twelfth embodiment of an ozone treatment apparatus according to the present invention. This ozone treatment apparatus has substantially the same configuration as the ozone treatment apparatus shown in FIG. 2. In FIG. 13, the same parts as those of the second embodiment shown in FIG. Description is omitted.

  As shown in FIG. 13, the ozone-containing sludge 15 that has been circulated and treated in the ozone reaction tank 12 and the sludge receiving tank 16 for a certain period of time in the lower part of the sludge receiving tank 16 is continuously introduced into the biological treatment tank. A three-way valve 33 is installed. As a result, the ozone-treated ozone-containing sludge 15 can be continuously supplied to a subsequent biological treatment tank, for example, an anaerobic digestion tank.

Thirteenth Embodiment FIG. 14 is a block diagram showing a thirteenth embodiment of an ozone treatment apparatus according to the present invention. This ozone treatment apparatus has substantially the same configuration as the ozone treatment apparatus shown in FIG. 2, and in FIG. 14, the same parts as those of the second embodiment shown in FIG. To do.

  As shown in FIG. 14, a sensor 35 for detecting the amount of foam in the ozone reaction tank 12 is provided. The sensor 35 detects the amount of foam in the ozone reaction tank 12 and controls the flow rate returned from the sludge receiving tank 16. can do.

  Thus, by detecting the amount of foam in the ozone reaction tank 12 by the sensor 35 and controlling the flow rate returned from the sludge receiving tank, the liquid phase region 17, the foam region 18 and the overflow region 19 in the ozone reaction tank 12 are controlled. The water level can always be kept constant.

14th Embodiment FIG. 15 is a block diagram showing a 14th embodiment of an ozone treatment apparatus according to the present invention. This ozone treatment apparatus has substantially the same configuration as the ozone treatment apparatus shown in FIG. 2. In FIG. 15, the same parts as those of the second embodiment shown in FIG. .

  As shown in FIG. 15, a sensor 35 a for detecting pH is provided in the ozone reaction tank 12, and the pH in the ozone reaction tank 12 can be detected by the sensor 35 a to control the pH in the sludge receiving tank 16. .

  Thus, the ozone treatment can be performed more efficiently by detecting the pH in the ozone reaction tank 12 by the sensor 35a and controlling the pH in the sludge receiving tank 16.

Fifteenth Embodiment FIG. 16 is a block diagram showing the fifteenth embodiment of the ozone treatment apparatus according to the present invention. This ozone treatment apparatus has substantially the same configuration as the ozone treatment apparatus shown in FIG. 2. In FIG. 16, the same parts as those of the second embodiment shown in FIG. .

  In FIG. 16, an extraction pump 34 for extracting the ozone-containing sludge 15 from the ozone reaction tank 12 and introducing it into the sludge receiving tank 16 is provided in the ozone reaction tank 12.

  In this case, the water level of the liquid phase region 17, the foam region 18 and the overflow region 19 in the ozone reaction tank 12 can be controlled by extracting the ozone-containing sludge 15 from the ozone reaction tank 12 by the pump 34. Further, a sensor 35 for detecting the amount of foam is provided in the ozone reaction tank 12, the amount of foam in the ozone reaction tank 12 is detected by the sensor 35, and the amount of sludge extracted by the pump 34 from the ozone reaction tank 12 can be controlled. For this reason, the water level of the liquid phase area | region 17, the foam area | region 18, and the overflow area 19 in the ozone reaction tank 12 can be maintained more reliably.

The block diagram which shows 1st Embodiment of the ozone treatment apparatus of the organic sludge by this invention. The block diagram which shows 2nd Embodiment of the ozone treatment apparatus of the organic sludge by this invention. The block diagram which shows 3rd Embodiment of the ozone treatment apparatus of the organic sludge by this invention. The block diagram which shows 4th Embodiment of the ozone treatment apparatus of the organic sludge by this invention. The block diagram which shows 5th Embodiment of the ozone treatment apparatus of the organic sludge by this invention. The block diagram which shows 6th Embodiment of the ozone treatment apparatus of the organic sludge by this invention. The block diagram which shows 7th Embodiment of the ozone treatment apparatus of the organic sludge by this invention. The block diagram which shows 8th Embodiment of the ozone treatment apparatus of the organic sludge by this invention. The block diagram which shows 9th Embodiment of the ozone treatment apparatus of the organic sludge by this invention. The block diagram which shows 10th Embodiment of the ozone treatment apparatus of the organic sludge by this invention. The block diagram which shows 11th Embodiment of the ozone treatment apparatus of the organic sludge by this invention. The block diagram which shows 11th Embodiment of the ozone treatment apparatus of the organic sludge by this invention. The block diagram which shows 12th Embodiment of the ozone treatment apparatus of the organic sludge by this invention. The block diagram which shows 13th Embodiment of the ozone treatment apparatus of the organic sludge by this invention. The block diagram which shows 14th Embodiment of the ozone treatment apparatus of the organic sludge by this invention. The block diagram which shows 15th Embodiment of the ozone treatment apparatus of the organic sludge by this invention. The block diagram which shows an example of the conventional ozone treatment apparatus.

Explanation of symbols

11 Sludge to be treated 12 Ozone reaction tank 13 Ozone containing gas 14 Ozone generator 15 Ozone containing sludge 16 Sludge receiving tank 17 Liquid phase area 18 Foam area 19 Overflow area 20 Return pump 20a Return pipe 21 Storage tank 22 Pressure resistant sludge receiving tank 23 Piston 24 Heat resistant sludge receiving tank 25 Heater 26 Cooler 27 Rotating shaft 28 with paddle 28 Stirrer 29 Rotating sludge receiving tank 30 Motor 31 Ultrasonic generator 32 Nozzle 33 Three-way valve 34 Extraction pump 35 Sensor 35a Sensor

Claims (8)

An organic sludge is supplied, ozone gas is introduced into the organic sludge from below, and an ozone reaction tank that performs ozone treatment as ozone-containing sludge formed by foaming the organic sludge;
A sludge receiving tank for storing the ozone-containing sludge flowing out of the ozone reaction tank while maintaining the foamed state of the ozone-containing sludge;
The ozone reaction tank is located below and has a liquid phase region in which ozone gas is in gas-liquid contact with the supplied organic sludge, and an ozone-containing sludge formed above the liquid phase region and foamed with organic sludge. The foam-containing region in which the ozone-containing sludge is formed and the ozone-containing sludge formed and foamed above the foam region have an overflow region where the ozone-containing sludge flows over to the sludge receiving tank while maintaining the foamed state of the ozone-containing sludge. Organic sludge ozone treatment equipment.   The organic sludge ozone treatment apparatus according to claim 1, wherein the sludge receiving tank is connected to the ozone reaction tank by a return pipe having a return pump.   The ozone treatment of organic sludge according to any one of claims 1 to 2, further comprising a defoaming means for defoaming ozone-containing sludge formed by foaming the organic sludge in a sludge receiving tank. apparatus.   The organic sludge ozone treatment apparatus according to any one of claims 1 to 3, wherein a pH adjusting agent charging section is connected to the sludge receiving tank.   The organic sludge ozone treatment device according to any one of claims 1 to 4, wherein a pressure reducing mechanism is provided in the sludge receiving tank.   The organic sludge ozone treatment apparatus according to any one of claims 1 to 5, wherein a heating mechanism is provided in the sludge receiving tank.   The organic sludge ozone treatment apparatus according to any one of claims 1 to 6, wherein the sludge receiving tank is provided with a cooling mechanism.   The organic sludge ozone treatment device according to any one of claims 1 to 7, wherein a stirring device is provided in the sludge receiving tank.

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