JP2009022955A - Method for treating organic solid-containing waste water, and treatment method therefor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for treating organic solid-containing waste water where organic solid-containing waste water can be treated at high precision with a small additional amount of ozone, and to provide a treatment device therefor. <P>SOLUTION: The treatment device for organic solid-containing waste water is provided with: an acid generation tank 12 which introduces organic solid-containing waste water thereinto and performs acid generation; and an ozone reaction tank 15 arranged at the downstream side of the acid generation tank 12. The downstream side of the ozone reaction tank 15 is provided with a pH control tank 16 and a biological treatment tank 17. The space between the ozone reaction tank 15 and the acid generation tank 12 is provided with a return tube 31 having a return pump 19a. By circulating waste water between the acid generation tank 12 and the ozone reaction tank 15, acid generation and solubilization in the waste water are simultaneously performed, and the waste water can be surely treated. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention can effectively use wastewater containing organic solids such as primary sludge and excess sludge discharged from a sewage treatment process such as a sewage treatment facility and a sewage treatment facility, and can reduce the volume. The present invention relates to a method and apparatus for treating waste water containing organic solids.

Conventional technology

  When organic solid-containing wastewater, for example, municipal sewage or organic industrial wastewater, is purified by the activated sludge method, a large amount of organic solids called primary sludge or excess sludge is generated. The amount of these organic solids generated has increased at a rate of 5% per year with the recent development of sewers. 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 disposal sites have only a few years remaining, and the processing of increasing organic solids is a major problem.

  One way to solve this problem is to treat organic solids by a methane fermentation process. The organic solid methane fermentation process has advantages such as energy recovery as methane gas, low energy consumption, and high killing rate of pathogenic bacteria.

  On the other hand, the methane fermentation process comprises (1) a hydrolysis process or solubilization process, (2) an acid production process, and (3) a methane production process. In these three chain processes, elution of intracellular high molecular substances such as proteins, nucleic acids, lipids and carbohydrates and reduction of the molecular weight by hydrolysis of these substances become the rate-determining step, requiring a long digestion period of 20 to 30 days. In addition, it has been pointed out that the organic substance decomposition rate remains at 30 to 50%.

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

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

  As shown in FIG. 13, the conventional organic solid-containing wastewater treatment apparatus using ozone includes an ozone reaction tank 2 that introduces organic solid-containing wastewater 1 and performs ozone treatment, and an ozone-containing gas 3. An ozone generator 4 to be introduced and a biological treatment tank 5 for biological treatment are provided.

  In FIG. 13, the organic solid-containing wastewater 1 introduced into the ozone reaction tank 2 comes into contact with the ozone-containing gas 3 introduced from the lower part of the ozone reaction tank 2 and is oxidatively decomposed. The organic solid-containing wastewater 1 that has been subjected to ozone treatment in the ozone reaction tank 2 for a certain period of time is introduced into the biological treatment tank 7 by the introduction pump 6 and treated using the decomposition action of microorganisms.

  However, an organic solid-containing wastewater treatment apparatus using ozone has a problem in that the amount of ozone, which is relatively expensive, is increased in order to obtain a sufficient treatment effect, and the treatment cost is increased.

  The present invention has been made in consideration of such points, and is a method and apparatus for treating waste water containing organic solids that can reduce the amount of ozone added and reliably treat organic solids. The purpose is to provide.

  The present invention circulates organic solid-containing wastewater in an acid generation tank for acid generation and an ozone reaction tank for ozone treatment, and then sends the organic solid-containing wastewater to a biological treatment tank for biological treatment. An organic solid-containing wastewater treatment method characterized by performing treatment, an acid generation tank for generating an acid by introducing the organic solid-containing wastewater, and an acid generation tank connected to the downstream side of the acid generation tank An ozone reaction tank that performs ozone treatment on waste water from the water, a pH adjustment tank that is connected to the downstream side of the ozone reaction tank and that adjusts the pH of waste water from the ozone reaction tank, and a pH that is connected to the downstream side of the pH adjustment tank A biological treatment tank that performs biological treatment of wastewater from the adjustment tank, and a return pipe for returning wastewater in the ozone reaction tank to the acid generation tank is provided between the ozone reaction tank and the acid generation tank. A wastewater treatment device containing organic solids .

  According to the present invention, the contact time between the organic solid-containing wastewater and the ozone-containing gas can be increased by circulating the organic solid-containing wastewater between the acid generation tank and the ozone reaction tank. A sufficient treatment effect can be obtained with a smaller amount of ozone added than in the past. The wastewater is then adjusted in pH in a pH adjustment tank and treated in a biological treatment tank.

  Moreover, after carrying out the circulation process for a fixed time in the said acid production tank and the said ozone reaction tank, the whole quantity of organic solid containing waste water may be discharged | emitted, and you may introduce into a biological treatment tank.

  In addition, (1) to adjust the introduction amount and pH to the subsequent ozone treatment tank, or (2) to temporarily promote solubilization, the circulation from the acid generation tank to the ozone treatment tank is temporarily stopped, An acid generation tank can also be used as a residence tank.

  Regarding (2), when excess sludge is used as organic solid-containing wastewater, even if the pH of the excess sludge is temporarily adjusted to 11, the pH can be changed to around 7 by staying for about 24 hours. it can. By utilizing this action, ozone decomposition in the alkaline region can be suppressed by the subsequent ozone treatment, and the oxidative decomposition efficiency can be increased.

  Further, after the wastewater is circulated for a certain time between the acid generation tank and the ozone reaction tank, a part of the organic solid-containing wastewater 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 rate control unit that detects the amount of waste water in the acid generation tank and controls the first pump.

  According to the present invention, the first flow rate control unit for detecting the amount of waste water in the acid generation tank is provided, the amount of waste water in the acid generation tank is detected by the first flow rate control unit, and introduced from the acid generation tank to the ozone treatment tank. By automatically controlling the amount of wastewater to be circulated, the amount of circulation between the acid generation tank and the ozone treatment tank can be stabilized.

  In the present invention, the ozone reaction tank may be provided with a second flow rate control unit that detects the amount of waste water in the ozone reaction tank and controls the return pump.

  According to the present invention, the ozone reaction tank is provided with the second flow rate control unit that detects the amount of waste water, and the second flow rate control unit detects the amount of waste water in the acid generation tank and returns it from the ozone treatment tank to the acid generation tank. By automatically controlling the amount of wastewater to be circulated, 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, initial settling sludge or excess sludge discharged from a sewage treatment process such as a sewage treatment facility or a manure 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 generation tank can be converted to methane by the decomposition action of the anaerobic methane bacterium. .

  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 this invention, a biological treatment tank may consist of an anaerobic biological treatment tank and the aerobic biological treatment tank provided in the downstream of this anaerobic biological treatment tank.

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

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

  According to the present invention, by introducing the organic solid-containing waste water remaining in the aerobic biological treatment tank into the acid generation tank, the amount of organic solid remaining in the present process can be further suppressed.

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

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

  In this invention, you may provide the pH adjustment means which adjusts the pH in an acid production tank in an acid production tank.

  According to these inventions, solubilization of organic solids and acid generation can be further promoted by having an acid generation tank having a stirring function, maintaining a heated state, and having a pH adjustment function. .

  In this invention, you may provide the temperature control part which detects the temperature of the wastewater in an acid production tank and controls a heating apparatus in an acid production tank.

  According to the present invention, the temperature control unit that detects the temperature of the acid generation tank and controls the heating device is provided. The temperature control unit detects the temperature in the acid generation tank, and automatically sets the temperature in the acid generation tank. It is possible to control, so that the solubilization and acid generation of the organic solid can be performed more effectively.

  In this invention, you may provide the pH control part which detects the pH of the wastewater in an acid production tank and controls a pH adjustment means in an acid production tank.

  According to the present invention, the acid generation tank is equipped with a pH control unit that detects the pH and controls the pH adjusting means. The pH control unit detects the pH in the acid generation tank and controls the pH in the acid generation tank. And solubilization and acid generation of organic solids can be performed more effectively.

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

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

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

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

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

  In the present invention, the acid added to the acid generation tank may be H2 SO4.

  Further, in the present invention, the acid added to the acid generation tank may be HNO3.

  According to these inventions, by maintaining the pH of the organic solid-containing wastewater at an appropriate acidic condition, the oxidative decomposition efficiency of the ozone treatment is increased and the conversion of the generated organic acid to methane can be suppressed. .

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

  According to the present invention, by maintaining the pH of the organic solid-containing wastewater at an appropriate alkaline condition, solubilization of the organic solid progresses and the generation of the organic acid can be promoted.

  According to the present invention, organic solid-containing wastewater is circulated between an acid generation tank and an ozone reaction tank, and pH adjustment and ozone treatment of wastewater are performed by the acid generation tank and the ozone reaction tank to generate acid. Solubilization can be performed simultaneously. For this reason, organic solid-containing wastewater can be treated with a smaller amount of ozone added than before. Further, by combining with a biological sludge reduction method, organic solids can be reduced more effectively and economically.

BEST MODE FOR CARRYING OUT THE INVENTION

  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 a first embodiment of a method and apparatus for treating organic solid-containing wastewater according to the present invention.

  In the present embodiment, the organic solid-containing wastewater circulates between the acid generation tank and the ozone reaction tank, so that the contact time between the organic solid-containing wastewater and the ozone-containing gas can be increased. An apparatus for treating waste water containing volatile solids will be described.

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

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

  A return pipe 31 for returning waste water 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 attached to the return pipe 31. Yes. Further, a sludge pipe 32 having a sludge pump 19 b 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.

  Next, the operation of the present embodiment having such a configuration will be described. In FIG. 1, the organic solid-containing wastewater 11 introduced into the acid generation tank 12 is introduced into the ozone reaction tank 15 by the first pump 18 a and comes into contact with the ozone-containing gas 13 introduced from the lower part of the ozone reaction tank 15. It is oxidized and decomposed. The organic solid-containing waste water 11 that has been subjected to ozone treatment in the ozone reaction tank 15 for a certain period of time is returned again to the acid generation tank 12 by the return pump 19a and processed while circulating.

  Further, (1) the amount introduced into the ozone treatment tank 15 and the pH of the wastewater are adjusted, or (2) the acid generation tank 12 is moved to the ozone reaction tank 15 for the purpose of promoting solubilization and acid generation of the wastewater. It is also possible to temporarily stop the transfer of waste water and use the acid generation tank 12 as a retention tank.

  Thus, the organic solid-containing wastewater is circulated between the acid generation tank 12 and the ozone reaction tank 15 so that the solubilization of the organic solid and the acid generation can be performed simultaneously.

  When the ozone treatment in the ozone reaction tank 15 is performed in an acidic region of pH 5 or lower, the oxidative decomposition efficiency is increased, and the acid generation process performed by the action of the acid producing bacteria in the acid generation tank 12 is also generated by performing in the acidic region. Conversion of organic acid to methane can be suppressed.

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

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

  Next, the organic solid-containing wastewater that has been sufficiently solubilized and acid-generated by circulating treatment between the acid generation tank 12 and the ozone reaction tank 15 for a certain period of time is supplied to the pH adjustment tank 16 in its entirety or in part. 2 introduced by a pump 18b. In the pH adjusting tank 16, acid or alkali is added to the wastewater to adjust the pH of the wastewater to around 7, and then introduced into the biological treatment tank 17, for example, a methane fermentation tank, and the treatment is performed using the decomposition 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, and the amount of organic solids remaining in this process is suppressed.

  In addition, biogas from the biological treatment tank 17 is discharged outward, and 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.

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

  2 and 3, the same parts as those of the first embodiment shown in FIG.

  As shown in FIG. 2, a first flow rate controller 20 a that detects the amount of waste water and controls the first pump 18 a is installed in the acid generation tank 12. The first flow rate control unit 20a detects the amount of waste water in the acid generation tank 12, and controls the first pump 18a to adjust the amount of waste water introduced from the acid generation tank 12 to the ozone treatment tank 15. As a result, the amount of circulation between the acid generation tank 12 and the ozone treatment tank 15 can be stabilized.

  In addition, as shown in FIG. 3, the 1st flow volume control part 20a which controls the 1st pump 18a in the acid production tank 12 is provided, and also the 2nd flow volume which detects the amount of wastewater in the ozone reaction layer 15, and controls the return pump 19a The control unit 20b may be installed. The second flow rate control unit 20b detects the amount of waste water in the ozone reaction tank 15 and adjusts the amount of waste water to be returned from the ozone treatment tank 15 to the acid generation tank 12, so that the acid generation tank 12 and the ozone treatment tank 15 Circulation amount can be stabilized.

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

  4 and 5, the same parts as those of the first embodiment shown in FIG.

  As shown in FIG. 4, a fully mixed reactor 21 which is an anaerobic treatment tank is provided as a biological treatment tank. The anaerobic complete mixing type reactor 21 can convert the organic acid produced in the acid production tank 12 into methane by the decomposition action of methane bacteria, which are anaerobic bacteria.

  In addition, as shown in FIG. 5, you may use the UASB reactor 22 which is an anaerobic processing tank as a biological treatment tank. In FIG. 5, the anaerobic UASB reactor 22 can convert the organic acid generated in the acid generation layer 12 into methane by the decomposition action of methane bacteria, which are anaerobic bacteria.

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

  In this embodiment, after treating wastewater in an anaerobic biological treatment tank, it is introduced into an aerobic biological treatment tank to further decompose organic components in the wastewater.

  In FIG. 6 and FIG. 7, the same parts as those of the first embodiment shown in FIG.

  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 and an aerobic biological treatment tank 24 provided downstream of the anaerobic biological treatment tank 23. ing.

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

  As shown in FIG. 7, the organic solid-containing waste water (sludge) remaining in the anaerobic biological treatment tank 23 and the aerobic biological treatment tank 24 is returned to the acid generation tank 12 by the sludge pipe 32 having the sludge pump 19b. Also good.

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

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

  8 to 10, the same parts as those of the first embodiment shown in FIG.

  As shown in FIG. 8, a stirring device 25 is installed in the acid generation tank 12. This stirring device 25 can improve the mixing state in the acid generation tank 12 and further promote solubilization of the organic solid and acid generation.

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

  Further, as shown in FIG. 10, pH adjusting means 27 for adding acid or alkali may be installed in the acid generation tank 12. By adding an acid such as HCl, H2 SO4 or HNO3 or an alkali such as NaOH from the pH adjusting means 27 to the acid generation tank 12, solubilization of the organic solid and acid generation can be further promoted.

  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 generation tank 12 are detected in the acid generation tank 12, and the organic solid matter is automatically controlled by controlling the heating device 26 and the pH adjusting means 27 of the acid generation tank 12. Solubilization and acid generation are more effective.

  In FIG. 11 and FIG. 12, the same parts as those of the first embodiment shown in FIG.

  As shown in FIG. 11, a heating device 26 is provided in the acid generation tank 12, and a temperature control unit 28 that controls the heating apparatus 26 by detecting the temperature of waste water in the acid generation tank 12 in the acid generation tank 12. Is installed. By detecting the temperature of the waste water in the acid generation tank 12 by this temperature control unit 28 and automatically adjusting the temperature of the waste water in the acid generation tank 12, solubilization of organic solids and acid generation are more effectively performed. It can be carried out.

  In addition, as shown in FIG. 12, the pH adjustment means 27 is provided in the acid production tank 12, and the pH control part which detects the pH of the waste water in the acid production tank 12 and controls the pH adjustment means 27 in the acid production tank 12. 29 may be installed. By detecting the pH of the wastewater in the acid generation tank 12 by this pH control unit 29 and automatically adjusting the pH of the wastewater in the acid generation tank 12, solubilization of organic solids and acid generation are more effectively performed. It can be carried out.

The block diagram which shows 1st Embodiment of the processing method and processing apparatus of the organic solid containing waste water by this invention. The block diagram which shows 2nd Embodiment of the processing method and processing apparatus of the organic solid containing waste water by this invention. The block diagram which shows the modification of the 2nd Embodiment of this invention. The block diagram which shows 3rd Embodiment of the processing apparatus of the wastewater containing organic solid substance by this invention. The block diagram which shows the modification of the 3rd Embodiment of this invention. The block diagram which shows 4th Embodiment of the processing apparatus of the organic solid containing waste water by this invention. The block diagram which shows the modification of the 4th Embodiment of this invention. The block diagram which shows 5th Embodiment of the processing apparatus of the wastewater containing organic solid substance by this invention. The block diagram which shows the modification of the 5th Embodiment of this invention. The block diagram which shows the modification of the 5th Embodiment of this invention. The block diagram which shows 6th Embodiment of the processing apparatus of the wastewater containing organic solid substance by this invention. The block diagram which shows the modification of the 6th Embodiment of this invention. The block diagram which shows the processing apparatus of the conventional organic solid containing waste water.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 Organic solid containing waste water 12 Acid production tank 13 Ozone containing gas 14 Ozone generator 15 Ozone reaction tank 16 pH adjustment tank 17 Biological treatment tank 18a 1st pump 18b 2nd pump 18c 3rd pump 19a Return pump 19b Sludge pump 20a First flow control unit 20b Second flow control unit 21 Anaerobic complete mixing reactor 22 Anaerobic UASB reactor 23 Anaerobic biological treatment tank 24 Aerobic biological treatment tank 25 Stirring device 26 Heating device 27 pH adjustment Equipment 28 Temperature controller 29 pH controller

Claims (10)

  The organic solid-containing wastewater is circulated in an acid generation tank for acid generation and an ozone reaction tank for ozone treatment, and then this organic solid-containing wastewater is sent to the biological treatment tank for biological treatment. A method for treating organic solid-containing wastewater. An acid generation tank that introduces organic solid-containing wastewater to generate acid;
An ozone reaction tank connected to the downstream side of the acid generation tank and performing ozone treatment on waste water from the acid generation tank;
A pH adjustment tank that is connected to the downstream side of the ozone reaction tank and adjusts the pH of wastewater from the ozone reaction tank;
a biological treatment tank connected to the downstream side of the pH adjustment tank and performing biological treatment of wastewater from the pH adjustment tank;
An organic solid-containing wastewater treatment apparatus comprising a return pipe for returning wastewater in an ozone reaction tank to an acid generation tank between the ozone reaction tank and the acid generation tank.   3. The apparatus for treating wastewater containing organic solids according to claim 2, wherein the biological treatment tank is an anaerobic complete mixing reactor or an anaerobic UASB reactor.   The biological treatment tank comprises an anaerobic biological treatment tank and an aerobic biological treatment tank provided on the downstream side of the anaerobic biological treatment tank. apparatus.   The apparatus for treating organic solid-containing wastewater according to claim 2, wherein a stirring device is provided in the acid generation tank.   The apparatus for treating wastewater containing organic solids according to claim 2, wherein a heating device is provided in the acid generation tank.   The apparatus for treating wastewater containing organic solids according to claim 2, wherein pH adjusting means for adjusting pH in the acid generation tank is provided in the acid generation tank.   The organic solid-containing wastewater treatment apparatus according to claim 6, wherein the acid generation tank is provided with a temperature control unit that detects the temperature of the wastewater in the acid generation tank and controls the heating device.   8. The organic solid-containing wastewater treatment apparatus according to claim 7, wherein a pH control unit for detecting pH of wastewater in the acid generation tank and controlling pH adjusting means is provided in the acid generation tank.   The process of temporarily stopping the transfer of wastewater from the acid generation tank to the ozone reaction tank and further using the acid generation tank as a residence tank, thereby adjusting the amount of wastewater introduced into the ozone reaction tank and the pH of the wastewater The organic solid-containing wastewater treatment method according to claim 1, wherein the wastewater solubilization and acid generation can be promoted.

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