JP2001000985A - Method and apparatus for treating organic solid- containing wastewater - Google Patents

Abstract

PROBLEM TO BE SOLVED: To highly accurately treat org. solid-containing wastewater by the reduced addition amt. of ozone. SOLUTION: A treatment apparatus of org. solid-containing wastewater is equipped with an acid forming tank 12 receiving org. solid-containing wastewater to form an acid and the ozone reaction tank 15 arranged on the downstream side of the acid forming tank 12. A pH adjusting tank 16 and a biological treatment tank 17 are arranged on the downstream side of the ozone reaction tank 15 and a return pipe 31 having a return pump 19a is disposed between the ozone reaction tank 15 and the acid forming tank 12. Acid formation and solubilization in wastewater are performed at the same time by circulating wastewater between the acid forming tank 12 and the ozone reaction tank 15 to certainly treat wastewater.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention can effectively utilize wastewater containing organic solids such as primary sludge and excess sludge discharged from a sewage treatment process such as a sewage treatment plant and a human waste treatment plant. The present invention relates to a method and an apparatus for treating organic solid matter-containing wastewater that can be reduced in volume.

[0002]

2. Description of the Related Art When wastewater containing organic solids, such as municipal sewage and organic industrial wastewater, is purified by an activated sludge method, a large amount of organic solids called primary sludge and excess sludge are generated. The amount of these organic solids generated has increased at a rate of 5% per year due to recent sewerage development. The amount is 1.5 million tons / year in terms of dry weight, and the final disposal amount is 200 Up to 2.5 million tons / year. Although 70% of these organic solids are disposed of by landfill, the majority of the disposal sites have only a few years remaining, and the treatment of increasing organic solids is a major problem.

[0003] One method of solving this problem is to treat organic solids by a methane fermentation process. The methane fermentation process for organic solids
It has advantages such as the ability to recover energy as methane gas, low energy consumption, and high mortality of pathogenic bacteria.

On the other hand, the methane fermentation process includes a hydrolysis process or a solubilization process, an acid generation process,
It consists of a methane production process. In these three chain processes, the elution of intracellular macromolecules such as proteins, nucleic acids, lipids and carbohydrates and the reduction of molecular weight by hydrolysis of these substances become the rate-determining steps, and 20 to 30
It has been pointed out that the method requires a long digestion time and that the decomposition rate of organic substances is limited to 30 to 50%.

[0005] Therefore, for the purpose of solubilizing biodegradable organic matter in wastewater containing organic solid matter and improving digestion efficiency, pretreatment of wastewater containing organic solid matter using the oxidizing power of ozone is performed. ing.

FIG. 13 is a block diagram showing an example of a conventional apparatus for treating organic solids-containing wastewater using ozone.

[0007] As shown in FIG. 13, a conventional treatment apparatus for wastewater containing organic solids using ozone is an ozone reaction tank 2 for performing ozone treatment by introducing wastewater 1 containing organic solids.
An ozone generator 4 for introducing an ozone-containing gas 3,
And a biological treatment tank 5 for performing biological treatment.

In FIG. 13, the wastewater 1 containing organic solids introduced into the ozone reactor 2 is oxidized and decomposed by contact with the ozone-containing gas 3 introduced from the lower part of the ozone reactor 2. The organic solid-containing wastewater 1 which has been ozone-treated for a certain time in the ozone reaction tank 2 is introduced into a biological treatment tank 7 by an introduction pump 6 and is treated by utilizing the action of decomposing microorganisms.

[0009]

However, in the treatment apparatus for wastewater containing organic solids using ozone, the amount of ozone which is relatively expensive is large in order to obtain a sufficient treatment effect, and the treatment cost is high. Is high.

The present invention has been made in view of the above points, and a method for treating organic solid-containing wastewater capable of reducing the amount of added ozone and reliably treating organic solids. And a processing device.

[0011]

According to the present invention, an organic solid matter-containing wastewater is circulated in an acid generator for producing acid and an ozone reactor for ozone treatment. A method for treating an organic solid matter-containing wastewater, wherein the wastewater is sent to a biological treatment tank and subjected to biological treatment, an acid production tank for introducing an organic solid matter-containing wastewater to produce an acid, and an acid production tank An ozone reaction tank connected to the downstream of the ozone treatment tank for performing ozone treatment on wastewater from the acid generation tank; a pH adjustment tank connected to the downstream of the ozone reaction tank for adjusting the pH of the wastewater from the ozone reaction tank; A biological treatment tank connected to the downstream side of the adjustment tank for performing biological treatment of wastewater from the pH adjustment tank, wherein the wastewater in the ozone reaction tank is disposed between the ozone reaction tank and the acid generation tank. Organic, characterized by having a return pipe to return to A processing device in the form-containing wastewater.

According to the present invention, the contact time between the organic solid-containing wastewater and the ozone-containing gas is extended by circulating the organic solid-containing wastewater between the acid generating tank and the ozone reaction tank. As a result, a sufficient treatment effect can be obtained with a smaller amount of ozone than before. The wastewater is then pH-adjusted in a pH-adjusting tank and treated in a biological treatment tank.

[0013] Further, after circulating in the acid generating tank and the ozone reaction tank for a certain period of time, the entire amount of the organic solid-containing wastewater may be discharged and introduced into the biological treatment tank.

Further, in order to adjust the introduction amount and pH to the subsequent ozonation tank and to promote solubilization, the circulation from the acid generation tank to the ozone processing tank is temporarily stopped, and the acid generation tank is stopped. Can also be used as a retention tank.

[0015] Regarding the use of excess sludge as wastewater containing organic solids, the pH of the excess
Even if the pH is adjusted, the pH can be changed to around 7 by staying for about 24 hours. Using this effect,
Ozone self-decomposition in an alkaline region can be suppressed in the subsequent ozone treatment, and oxidative decomposition efficiency can be increased.

After circulating wastewater between the acid generating tank and the ozone reaction tank for a certain period of time, a part of the wastewater containing organic solids may be discharged and introduced into the biological treatment tank.

In the present invention, the acid generation tank may be provided with a first flow control unit for detecting the amount of wastewater in the acid generation tank and controlling the first pump.

According to the present invention, there is provided a first flow control unit for detecting the amount of wastewater in the acid generation tank, the first flow control unit detects the amount of wastewater in the acid generation tank, and the ozone treatment from the acid generation tank. By automatically controlling the amount of wastewater introduced into the tank, the amount of circulation between the acid generation tank and the ozone treatment tank can be stabilized.

In the present invention, a second pump for controlling a return pump by detecting the amount of wastewater in the ozone reaction tank in the ozone reaction tank.
A flow control unit may be provided.

According to the present invention, the ozone reaction tank is provided with a second flow rate control unit for detecting the amount of waste water, the second flow rate control unit detects the amount of waste water in the acid generation tank, and the acid generation from the ozone treatment tank. By automatically controlling the amount of wastewater returned to the tank, the amount of circulation between the acid generation tank and the ozone treatment tank can be stabilized.

In the present invention, the organic solid matter may be organic sludge, for example, primary sludge or excess sludge discharged from a sewage treatment process such as a sewage treatment facility or a human waste treatment facility.

In the present invention, the biological treatment tank may be an anaerobic treatment tank.

According to the present invention, since the biological treatment tank is an anaerobic treatment tank, the organic acid generated in the acid production tank is converted into methane by the decomposing action of anaerobic methane bacteria. be able to.

In the present invention, the biological treatment tank may be an anaerobic complete mixing type reactor.

In the present invention, the biological treatment tank may be an anaerobic UASB reactor.

In the present invention, the biological treatment tank may comprise an anaerobic biological treatment tank and an aerobic biological treatment tank provided downstream of the anaerobic biological treatment tank.

According to the present invention, after treating wastewater in the anaerobic biological treatment tank, the wastewater is introduced into the aerobic biological treatment tank, whereby organic components in the wastewater can be further decomposed.

In the present invention, the wastewater containing organic solids remaining in the aerobic biological treatment tank may be returned to the acid generation tank.

According to the present invention, the amount of organic solids remaining in the present process can be further suppressed by introducing the wastewater containing organic solids remaining in the aerobic biological treatment tank into the acid generating tank.

In the present invention, a stirring device may be provided in the acid generating tank.

In the present invention, a heating device may be provided in the acid generation tank.

In the present invention, the acid generating tank may be provided with a pH adjusting means for adjusting the pH in the acid generating tank.

According to these inventions, the acid generating tank has a stirring function, maintains a heated state, and has a pH adjusting function, thereby further promoting solubilization of organic solids and acid generation. be able to.

In the present invention, the acid generation tank may be provided with a temperature control section for detecting the temperature of the wastewater in the acid generation tank and controlling the heating device.

According to the present invention, there is provided a temperature control section for detecting the temperature of the acid generation tank and controlling the heating device, and detecting the temperature in the acid generation tank by the temperature control section. The temperature can be automatically controlled, so that the organic solid can be solubilized and acid generated more effectively.

In the present invention, the acid generation tank may be provided with a pH control section for detecting the pH of the wastewater in the acid generation tank and controlling the pH adjusting means.

According to the present invention, the acid generating tank is provided with a pH control section for detecting pH and controlling pH adjusting means.
The pH in the acid generation tank can be detected by the control unit and the pH in the acid generation tank can be controlled, so that the organic solid can be solubilized and the acid can be generated more effectively.

In the present invention, an acid may be added to the acid generating tank.

According to the present invention, the oxidative decomposition efficiency of the ozone treatment is increased by adding an acid to the acid generating tank,
Conversion of the generated organic acid to methane can be suppressed.

In the present invention, an alkali may be added to the acid generating tank.

According to the present invention, by adding an alkali to the acid generating tank, the solubilization of the organic solid substance proceeds, and the generation of the organic acid can be promoted.

In the present invention, the acid added to the acid generating tank may be HCl.

In the present invention, the acid added to the acid generating tank may be H ₂ SO ₄ .

Further, in the present invention, the acid added to the acid generating tank may be HNO ₃ .

According to these inventions, by maintaining the pH of the wastewater containing organic solids under appropriate acidic conditions, the oxidative decomposition efficiency of the ozone treatment is increased and the conversion of the produced organic acid to methane is suppressed. be able to.

In the present invention, the alkali added to the acid generating tank may be NaOH.

According to the present invention, by maintaining the pH of the wastewater containing organic solids under appropriate alkaline conditions, the solubilization of the organic solids proceeds and the production of organic acids can be promoted.

[0048]

DESCRIPTION OF THE PREFERRED EMBODIMENTS First Embodiment An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram showing a first embodiment of a method and an apparatus for treating organic solid matter-containing wastewater according to the present invention.

In this embodiment, the contact time between the organic solid matter-containing wastewater and the ozone-containing gas is extended by circulating the organic solid matter-containing wastewater between the acid generation tank and the ozone reaction tank. An apparatus for treating organic solid matter-containing wastewater that can be produced will be described.

FIG. 1 is a block diagram showing a first embodiment of a treatment apparatus for wastewater containing organic solid matter according to the present invention. As shown in FIG. 1, an organic solid matter-containing wastewater treatment apparatus includes an acid generation tank 12 that introduces an organic solid matter-containing wastewater 11 to generate acid in the wastewater, and an ozone generator that generates an ozone-containing gas 13. And an ozone reaction tank 15 for performing ozone treatment of wastewater with the ozone-containing gas from the ozone generator 14
And a pH adjusting tank 16 for adjusting the pH of the wastewater containing organic solids, and a biological treatment tank 17 for performing biological treatment of the wastewater.

A first pump 18a for transferring waste water is provided between the acid generation tank 12 and the ozone reaction tank 15, and a second pump 18 for transferring waste water between the ozone reaction tank 15 and the pH adjustment tank 16. A third pump 18 is provided between the pH adjusting tank 16 and the biological treatment tank 17 for transferring wastewater.
c is provided.

A return pipe 31 for returning wastewater in the ozone reaction tank 15 to the acid generation tank 12 is provided between the ozone reaction tank 15 and the acid generation tank 12, and a return pump 19a is provided in the return pipe 31. Installed. Further, a sludge pipe 32 having a sludge pump 19b for returning sludge in the biological treatment tank 17 to the acid generation tank 12 is provided between the biological treatment tank 17 and the acid generation tank 12.
Is provided.

Next, the operation of the present embodiment having such a configuration will be described. In FIG.
The organic solid matter containing wastewater 11 introduced into the first pump 1
8a, it is introduced into the ozone reaction tank 15 and is oxidatively decomposed by contact with the ozone-containing gas 13 introduced from the lower part of the ozone reaction tank 15. The organic solid matter-containing wastewater 11 that has been ozone-treated for a certain time in the ozone reaction tank 15 is returned to the acid generation tank 12 again by the return pump 19a, and is processed while circulating.

In order to adjust the amount of wastewater introduced into the ozone treatment tank 15 and the pH of the wastewater, and to promote the solubilization of the wastewater and the generation of acid, the wastewater from the acid generation tank 12 to the ozone reaction tank 15 is used. The transfer is temporarily stopped, and the acid generation tank 12 is stopped.
Can also be used as a retention tank.

By circulating the wastewater containing organic solids between the acid generation tank 12 and the ozone reaction tank 15 in this manner, the solubilization of the organic solids and the acid generation can be performed simultaneously.

The ozone treatment in the ozone reaction tank 15 is p
When performed in an acidic region of H5 or less, the oxidative decomposition efficiency increases,
Also, the acid generation process performed by the action of the acid generating bacteria in the acid generation tank 12 can suppress the conversion of the organic acid generated by performing the acid generation in the acidic region to methane.

Further, the solubilization of organic solids proceeds even in an alkaline region having a pH of 9 or more, and the generation of organic acids can be promoted.

If the solubilization process and the acid generation process allow sufficient solubilization of organic solids and acid generation to proceed, the methane fermentation process that proceeds using these organic acids as substrates can be performed efficiently.

Next, the organic solid matter-containing wastewater which has been sufficiently solubilized and acid-produced by circulating between the acid generating tank 12 and the ozone reaction tank 15 for a certain period of time is entirely or partially p-type.
It is introduced into the H adjustment tank 16 by the second pump 18b. p
In the H adjusting tank 16, an acid or an alkali is added to the wastewater to adjust the pH of the wastewater to around 7, and then introduced into a biological treatment tank 17, for example, a methane fermentation tank, where the treatment is performed utilizing the decomposing action of microorganisms. Residual sludge generated in the biological treatment tank 17 is again introduced into the acid generation tank 12 by the sludge pump 19b, thereby suppressing the amount of organic solids remaining in the present process.

The biogas from the biological treatment tank 17 is discharged outward, and the wastewater treated in the biological treatment tank 17 is discharged as treated water.

Second Embodiment Next, a second embodiment of the present invention will be described with reference to FIGS.
This will be described below.

In the present embodiment, the amount of wastewater introduced from the acid generation tank 12 to the ozone treatment tank 15 is automatically controlled to stabilize the amount of circulation between the acid generation tank 12 and the ozone treatment tank 15. is there.

In FIGS. 2 and 3, the first type shown in FIG.
The same reference numerals are given to the same portions as those of the embodiment, and the detailed description is omitted.

As shown in FIG. 2, a first flow control unit 20a for detecting the amount of wastewater and controlling the first pump 18a is provided in the acid generation tank 12. This first flow control unit 20a
Detects the amount of wastewater in the acid generation tank 12 by the first pump 1
By controlling 8a, the amount of wastewater introduced from the acid generation tank 12 to the ozone treatment tank 15 is adjusted. Thereby, the amount of circulation between the acid generation tank 12 and the ozone treatment tank 15 can be stabilized.

As shown in FIG. 3, a first flow control unit 20a for controlling the first pump 18a is provided in the acid generating tank 12, and the return pump 19a is controlled by detecting the amount of waste water in the ozone reaction layer 15. The second flow control unit 20b may be provided. The amount of wastewater in the ozone reaction tank 15 is detected by the second flow control unit 20b, and the amount of wastewater returned from the ozone treatment tank 15 to the acid generation tank 12 is adjusted. The amount of circulation can be stabilized.

Third Embodiment Next, a third embodiment of the present invention will be described with reference to FIGS.
This will be described below.

Referring to FIGS. 4 and 5, the first type shown in FIG.
The same reference numerals are given to the same portions as those of the embodiment, and the detailed description is omitted.

As shown in FIG. 4, a completely mixed reactor 21 which is an anaerobic treatment tank is provided as a biological treatment tank. The anaerobic completely mixed type reactor 21 can convert the organic acid generated in the acid generating tank 12 into methane by the decomposing action of anaerobic methane bacteria.

As shown in FIG. 5, a UASB reactor 22 which is an anaerobic treatment tank may be used as the biological treatment tank. In FIG. 5, the anaerobic UASB reactor 22 can convert the organic acid generated in the acid generating layer 12 to methane by the decomposing action of the anaerobic methane bacterium.

Fourth Embodiment Next, a fourth embodiment of the present invention will be described with reference to FIGS.

In the present embodiment, the wastewater is treated in an anaerobic biological treatment tank, and then introduced into an aerobic biological treatment tank, whereby organic components in the wastewater are further decomposed.

Referring to FIGS. 6 and 7, the first
The same reference numerals are given to the same portions as those of the embodiment, and the detailed description is omitted.

As shown in FIG. 6, the biological treatment tank provided on the downstream side of the pH adjustment tank 16 includes an anaerobic biological treatment tank 23,
It comprises an aerobic biological treatment tank 24 provided downstream of the anaerobic biological treatment tank 23.

In FIG. 6, after the wastewater is treated in the anaerobic biological treatment tank 23, the wastewater is introduced into the aerobic biological treatment tank 24, whereby the organic components in the wastewater can be further decomposed.

As shown in FIG. 7, the organic solid-containing wastewater (sludge) remaining in the anaerobic biological treatment tank 23 and the aerobic biological treatment tank 24 is supplied to a sludge pipe 32 having a sludge pump 19b.
May be returned to the acid generation tank 12.

Fifth Embodiment Next, a fifth embodiment of the present invention will be described with reference to FIGS.
0 will be described.

In the present embodiment, the acid generating tank 12 is provided with a stirring function, a heating function, and a pH adjusting function.

FIGS. 8 to 10 show the first embodiment shown in FIG.
The same reference numerals are given to the same portions as those of the embodiment, and the detailed description is omitted.

As shown in FIG. 8, a stirrer 25 is provided in the acid generating tank 12. With this stirring device 25, the mixing state in the acid generation tank 12 can be improved, and solubilization of organic solids and acid generation can be further promoted.

As shown in FIG. 9, instead of providing the stirring device 25 in the acid generation tank 12, a heating device 26 may be installed in the acid generation tank 12. By maintaining the inside of the acid generation tank 12 in a heated state by the heating device 26, solubilization of organic solids and acid generation can be further promoted.

Further, as shown in FIG.
PH adjusting means 2 for adding acid or alkali to the inside
7 may be installed. HC from this pH adjusting means 27
l, H _TwoSO_FourOr HNO_ThreeAcid or NaOH
By adding an alkali such as
It can further promote solubilization and acid formation of organic solids
it can.

Sixth Embodiment Next, a sixth embodiment of the present invention will be described with reference to FIGS.

In the present embodiment, the temperature and pH in the acid generating tank 12 are detected in the acid generating tank 12 and the heating device 26 and the pH adjusting means 27 in the acid generating tank 12 are automatically controlled.
It is intended to more effectively solubilize organic solids and generate acids.

In FIGS. 11 and 12, the same parts as those in the first embodiment shown in FIG. 1 are denoted by the same reference numerals, and detailed description is omitted.

As shown in FIG. 11, a heating device 26 is provided in the acid generation tank 12, and the acid generation tank 12 is
A temperature control unit 28 that detects the temperature of wastewater in the inside and controls the heating device 26 is provided. The temperature control unit 28 detects the temperature of the wastewater in the acid generation tank 12 and
By automatically adjusting the temperature of the wastewater in the inside, solubilization of the organic solid matter and acid generation can be performed more effectively.

As shown in FIG. 12, a pH adjusting means 27 is provided in the acid generating tank 12, and the pH adjusting means 27 is controlled by detecting the pH of wastewater in the acid generating tank 12 in the acid generating tank 12. A pH controller 29 may be provided. The pH control unit 29 detects the pH of the wastewater in the acid generation tank 12,
By automatically adjusting the pH of the wastewater in the acid generating tank 12, the solubilization of the organic solid and the acid generation can be performed more effectively.

[0087]

As described above, according to the present invention, organic solid matter-containing wastewater is circulated between the acid generation tank and the ozone reaction tank, and the wastewater containing the organic solid matter is circulated by the acid generation tank and the ozone reaction tank. By performing pH adjustment and ozone treatment, acid generation and solubilization can be performed simultaneously. Therefore, wastewater containing organic solids can be treated with a smaller amount of added ozone than before. In addition, by combining with a biological sludge reduction method, organic solids can be reduced more effectively and economically.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing a first embodiment of a method and apparatus for treating organic solid matter-containing wastewater according to the present invention.

FIG. 2 is a configuration diagram showing a second embodiment of a method and an apparatus for treating organic solid matter-containing wastewater according to the present invention.

FIG. 3 is a configuration diagram showing a modification of the second embodiment of the present invention.

FIG. 4 is a configuration diagram showing a third embodiment of a treatment apparatus for organic solid matter-containing wastewater according to the present invention.

FIG. 5 is a configuration diagram showing a modification of the third embodiment of the present invention.

FIG. 6 is a configuration diagram showing a fourth embodiment of the treatment device for organic solid matter-containing wastewater according to the present invention.

FIG. 7 is a configuration diagram showing a modification of the fourth embodiment of the present invention.

FIG. 8 is a configuration diagram showing a fifth embodiment of the treatment apparatus for organic solid matter-containing wastewater according to the present invention.

FIG. 9 is a configuration diagram showing a modification of the fifth embodiment of the present invention.

FIG. 10 is a configuration diagram showing a modification of the fifth embodiment of the present invention.

FIG. 11 is a configuration diagram showing a sixth embodiment of the treatment device for organic solid matter-containing wastewater according to the present invention.

FIG. 12 is a configuration diagram showing a modification of the sixth embodiment of the present invention.

FIG. 13 is a configuration diagram showing a conventional organic solid matter-containing wastewater treatment apparatus.

[Explanation of symbols]

 Reference Signs List 11 wastewater containing organic solid matter 12 acid generating tank 13 ozone-containing gas 14 ozone generator 15 ozone reaction tank 16 pH adjusting tank 17 biological treatment tank 18a first pump 18b second pump 18c third pump 19a return pump 19b Sludge pump 20a First flow control unit 20b Second flow control unit 21 Anaerobic perfect mixing type reactor 22 Anaerobic UASB reactor 23 Anaerobic biological treatment tank 24 Aerobic biological treatment tank 25 Stirrer 26 Heating device 27 pH adjustment Device 28 Temperature control unit 29 pH control unit

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Nobuyuki Ashikaga 2-4-4 Suehirocho, Tsurumi-ku, Yokohama-shi, Kanagawa Prefecture Inside the Toshiba Keihin Works Co., Ltd. 2-4-4 Toshiba Keihin Works Co., Ltd. (72) Inventor Shimoniwa Shinobu 2-4-4 Suehirocho, Tsurumi-ku, Yokohama-shi, Kanagawa Prefecture F-term 4T040 AA04 AA12 AA34 AA61 AA62 BB02 BB12 BB52 BB91 4D050 AA15 AB11 AB16 BB02 BD02 BD04 BD06 BD08 CA01 CA13 CA17 CA20

Claims (11)

[Claims] An organic solid matter-containing wastewater is circulated through an acid generating tank for generating an acid and an ozone reaction tank for performing ozone treatment. A method for treating an organic solid matter-containing wastewater, comprising performing a simple treatment. 2. An acid generating tank for introducing an organic solid matter-containing wastewater to generate an acid, and an ozone reaction tank connected downstream of the acid generating tank for performing ozone treatment on wastewater from the acid generating tank. A pH adjustment tank connected to the downstream side of the ozone reaction tank to adjust pH of wastewater from the ozone reaction tank; and a biological treatment connected to the downstream side of the pH adjustment tank to perform biological treatment of wastewater from the pH adjustment tank. An organic solid matter-containing wastewater treatment apparatus, comprising: a tank; and a return pipe for returning wastewater in the ozone reaction tank to the acid generation tank between the ozone reaction tank and the acid generation tank. 3. An organic solvent according to claim 2, further comprising a first flow control unit for detecting an amount of wastewater in the acid generation tank and controlling an amount of wastewater from the acid generation tank to the ozone reaction tank. Equipment for treating wastewater containing solids. 4. An organic solvent according to claim 2, further comprising a second flow rate control unit for detecting an amount of wastewater in the ozone reaction tank and controlling a flow rate of the wastewater returned to the acid generation tank. For treating wastewater containing volatile solids. 5. The biological treatment tank is an anaerobic complete mixing type reactor,
3. The apparatus for treating organic solid matter-containing wastewater according to claim 2, wherein the apparatus is an anaerobic UASB reactor. 6. The organic solid according to claim 2, wherein the biological treatment tank comprises an anaerobic biological treatment tank and an aerobic biological treatment tank provided downstream of the anaerobic biological treatment tank. Wastewater treatment equipment. 7. An apparatus for treating organic solid matter-containing wastewater according to claim 2, wherein a stirrer is provided in the acid generation tank. 8. The apparatus for treating organic solid matter-containing wastewater according to claim 2, wherein a heating device is provided in the acid generation tank. 9. An apparatus for treating organic solid matter-containing wastewater according to claim 2, wherein the acid generating tank is provided with a pH adjusting means for adjusting the pH in the acid generating tank. 10. The wastewater containing organic solid matter according to claim 8, wherein a temperature control unit for detecting a temperature of the wastewater in the acid generation tank and controlling a heating device is provided in the acid generation tank. Processing equipment. 11. The organic solid matter-containing wastewater according to claim 9, wherein the acid generation tank is provided with a pH control section for detecting pH of the wastewater in the acid generation tank and controlling a pH adjusting means. Processing equipment.