JP2002166275A - Method and equipment for treating drainage containing thermally degradable organic compound - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for treating a drainage containing thermally decomposable organic compounds such as dioxins where the compounds contained in the drainage can be decomposed and treated with a membrane while suppressing the amount of an excessively produced sludge, and to provide an equipment therefor. SOLUTION: In the method for treating the drainage containing the thermally decomposable organic compounds such as dioxins, the liquid to be treated 1 is treated while the liquid is partially circulated 2, 5 between a membrane filtering process having a separating filter 10 and an accelerated oxidation reaction process 7 to obtain membrane permeated water 3 from the membrane filtering process as the treated water 4, a powdered activated carbon and/or an activated sludge is added to the liquid to be treated in the membrane filtering process, and it is preferred that the liquid to be treated is always fluidized by normally aerating inside the membrane filtering process, the membrane permeated water 3 from the membrane filtering process is allowed to pass through an activated carbon adsorption column 12 to obtain the treated water 4. In addition, the reaction process 7 comprises at least an ozonization reaction process where the liquid to be treated in the membrane filtering process is supplied and can be treated by circulating the liquid.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the treatment of wastewater containing hardly decomposable organic compounds, and more particularly to industrial wastewater, domestic wastewater, and final disposal sites containing hardly decomposable organic compounds such as dioxins and environmental hormones. The present invention relates to a method and an apparatus for performing membrane filtration of wastewater and sewage from an incineration plant or the like using a separation membrane.

[0002]

2. Description of the Related Art Conventionally, a treatment method for removing dioxins from wastewater containing dioxins is shown in FIG.
As shown in (1), the wastewater 1 containing dioxins is flowed into the biological treatment tank 26 to decompose and remove organic matter, and this mixed solution is separated into activated sludge 23 and supernatant water 24 by the sedimentation tank 21. It is made to flow into the sand filtration tank 22 to separate and remove suspended substances in the treated water to obtain treated sand filtered water 25. Further, this sand filtration treated water 25 is supplied to the activated carbon adsorption tower 12.
And the dioxins in the water to be treated are adsorbed and removed, and the effluent from the activated carbon adsorption tower 12 is obtained as the treated water 4, or the above-mentioned sand filtration treated water 25 is supplied to the promoted oxidation reaction tank to promote the treatment. Dioxins were decomposed and removed in the oxidation reaction tank, and the effluent from the accelerated oxidation reaction tank was obtained as treated water.

[0003] In the wastewater treatment using activated sludge, as a method of treating and disposing of excess sludge accompanying the treatment, it is necessary to obtain processes such as drawing, concentration, dehydration, and incineration and discharge the sludge to the outside of the system. The costs were quite enormous, leading to an increase in overall running costs. Furthermore, even in the sludge dewatering treatment, the complexity of maintenance associated with management of an appropriate chemical injection rate and the like remains. Recently, as sludge volume reduction treatment combined with activated sludge treatment, sludge of excess sludge amount or more is withdrawn from a sedimentation tank or biological reaction aeration tank, introduced into a separate ozone reaction tank into which ozone is injected, and treated. It is known that when returned sludge is returned to the biological reaction aeration tank, a part of the ozone-treated sludge is decomposed by the biological treatment in the aeration tank.

[0004] The treatment of such wastewater containing a hardly decomposable organic compound such as dioxins by a conventional technique has the following problems. In other words, in the sand filtration tank, it is necessary to perform backwashing with clear water at regular intervals, a large amount of water is required, and a large amount of washing wastewater containing contaminants accumulated in the sand filtration tank is required. There are problems that arise. In wastewater treatment using activated sludge, excess sludge is generated as a result of the treatment, and it is necessary to obtain processes such as drawing, concentration, dehydration, and incineration, and discharge the sludge to the outside of the system. The cost is quite enormous, and there is a problem that the overall running cost increases. Furthermore, in sludge dewatering treatment, there is a problem that maintenance accompanying management of an appropriate chemical injection rate or the like becomes complicated. Further, in the membrane treatment, it is necessary to discharge the concentrated water having the increased dioxin concentration out of the system, but disposal of the concentrated water poses a problem.

[0005]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems and decomposes and removes hard-to-decompose organic compounds from organic wastewater containing hard-to-decompose organic compounds such as dioxins and environmental hormones. It is another object of the present invention to provide a processing method and an apparatus that simultaneously decompose organic substances in wastewater and suppress the amount of excess sludge generated in a biological treatment process.

[0006]

According to the present invention, there is provided a method for treating wastewater containing a hardly decomposable organic compound, comprising the steps of: The treatment is performed while partially circulating between the accelerated oxidation reaction step and the membrane permeated water from the membrane filtration step is obtained as treated water. In the above treatment method, powdered activated carbon and / or activated sludge is added to the liquid to be treated in the membrane filtration step, and the liquid to be treated is preferably allowed to flow constantly by constantly aerating the membrane filtration step. The membrane permeated water from the membrane filtration step can be passed through an activated carbon adsorption step, and the effluent can be treated water. Further, the accelerated oxidation reaction step includes an ozone reaction step of injecting at least ozone. And a part of the liquid to be treated including the activated sludge in the membrane filtration step can be supplied and circulated. Further, according to the present invention, there is provided an apparatus for treating wastewater containing a hardly decomposable organic compound, comprising: a membrane filtration tank provided with a separation membrane containing a liquid to be treated having powdered activated carbon and / or activated sludge; A promoted oxidation reaction tank that undergoes oxidative decomposition, and a circulation path through which the liquid to be treated circulates between the membrane filtration tank and the promoted oxidation reaction tank, and the treated water is passed through the membrane permeated water that has passed through the separation membrane of the membrane filtration tank. And an activated carbon adsorption tower.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION In the present invention, examples of the hardly decomposable organic compound include organic chlorine compounds such as dioxins, and the like.
A compound that is not decomposed by biological treatment of ordinary activated sludge such as environmental hormones such as nonylphenol. In addition,
In the present invention, the accelerated oxidation reaction includes ozone, ultraviolet light,
This refers to a reaction in which hydrogen peroxide and a catalyst are combined to oxidatively decompose an organic compound. The catalyst includes a substance containing metal and activated carbon,
Powdered activated carbon can be mentioned. In the present invention, examples of the device configuration in the membrane filtration step include a device in which a membrane is immersed in a tank, a device using a cartridge type membrane module, and the like, but are not limited thereto. As the membrane, M
An F film, a UF film, an NF film, an RO film, or the like can be used. As the material, an organic compound, ceramic, metal or the like can be used.

Next, the present invention will be described in detail with reference to the drawings. FIG. 1 is a flow sheet showing an example of treating wastewater containing a hardly decomposable organic compound such as dioxins discharged from a research facility by the treatment method of the present invention. As shown in FIG. 1, a wastewater 1 containing a hardly decomposable organic compound is supplied to a promoted oxidation reaction step 7 to obtain a promoted oxidation reaction step effluent 2 from the promoted oxidation reaction step 7. Accelerated oxidation reaction process effluent 2
Is supplied to the membrane filtration step 9, which is subjected to suction filtration by the hollow fiber membrane 10 installed in the membrane filtration step 9, to obtain the permeated water 3. The permeated water 3 is supplied to the activated carbon adsorption step 12, and the effluent water 4 from the activated carbon adsorption step 12 from the activated carbon adsorption step 12 is obtained as treated water. The wastewater 1 containing the hardly decomposable organic compound may be supplied to the membrane filtration step 9. Powdered activated carbon and / or activated sludge can be added to the mixed solution in the membrane filtration step 9, and the concentration of the powdered activated carbon in the membrane filtration step 9 is 100
0 mg / L or more is preferable, and the concentration of activated sludge in the membrane filtration step 9 is preferably 3000 to 6000 mg / L.

A part of the mixed solution in the membrane filtration step 9 is circulated to the accelerated oxidation reaction step 7. Circulation may be performed continuously or intermittently. The average residence time of the effluent water 2 in the accelerated oxidation reaction step in the membrane filtration step 9 is preferably 4 hours or more. By returning a part of the mixed solution 5 in the membrane filtration step 9 to the accelerated oxidation reaction step 7, accumulation of sludge can be prevented, and the decomposition efficiency of the hardly decomposable organic compound can be improved. An ultraviolet lamp 8 is provided in the accelerated oxidation reaction step 7, and an ozone gas 6 is supplied from an ozone gas generator 13. Organic compounds are oxidatively decomposed. In the accelerated oxidation reaction step, the treatment method may be either a continuous method or a batch method. In a batch system, the flow of circulating water is intermittent. The batch type includes a type in which water is circulated between the accelerated oxidation reaction step and the storage tank. The average residence time of the treatment liquid in the accelerated oxidation reaction step 7 can be set arbitrarily. When the accelerated oxidation reaction is performed batchwise, the treatment time is preferably 1 hour to 24 hours. In addition, the membrane filtration step 9
Inside, there is provided a diffuser 11 for constantly aerating and flowing the mixed solution. The average residence time of the permeated water 3 in the activated carbon adsorption step 12 is preferably 1 hour or more.

FIG. 2 is a flow sheet showing another example of processing by the processing method of the present invention. FIG. 2 is a flow sheet of a method in which the oxidation treatment is performed batchwise instead of performing the continuous oxidation treatment in FIG. 1. In the accelerated oxidation reaction step 7, the storage tank 17 and the ozone gas 6 are introduced. And a UV unit 19 for irradiating UV light from the UV lamp 8. The water to be treated from the membrane treatment step 9 is periodically drawn out to the storage tank 17 by the circulating pump 15, and is stored in the storage tank 17. The to-be-processed water in the main reaction tank 1 is introduced with ozone gas 6 by a circulation pump 15 '.
The ozone is oxidized at 8, and then irradiated with the ultraviolet lamp 8 at the ultraviolet unit 19 to oxidize and decompose the hard-to-degrade biochemical in the circulation path 20 flowing into the storage tank 17. The treated water that has been oxidized in the accelerated oxidation reaction step is periodically transferred to the membrane separation step 9 by the circulation pump 15 ″, and is treated in the same manner as in FIG.

[0011]

EXAMPLES Hereinafter, the present invention will be described more specifically with reference to examples, but the present invention is not limited to these examples. Example 1 In Example 1, treatment of dioxin-containing wastewater was performed according to the flow shown in FIG. In the membrane filtration step, activated sludge and powdered activated carbon were added. First, the processing in the accelerated oxidation reaction step 7 will be described. In this embodiment, the ozone gas 6 supplied to the accelerated oxidation reaction tank process 7 is used.
Was supplied at an ozone gas injection rate of about 50 mg / L in the accelerated oxidation reaction step 7. The residence time in the accelerated oxidation reaction step 7 was about 0.5 hour, and the intensity of ultraviolet light was 1 W · h / L. In addition, accelerated oxidation reaction step 7
The amount of water in the mixed solution 5 of the membrane filtration tank supplied to the dioxin-containing wastewater 1 supplied to the accelerated oxidation reaction step 7 was substantially the same as the amount of water supplied to the dioxin-containing wastewater 1. Table 1 shows the water quality and amount of the dioxin-containing wastewater 1.

[0012]

[Table 1]

Table 2 shows the results of the treatment in the accelerated oxidation reaction step 7. As shown in Table 2, in this example, the accelerated oxidation reaction step 7
Dioxins are added to the mixed solution 5 in the membrane filtration step.
0pg-TEQ / L, 2 per drainage containing dioxin
Although 50 pg-TEQ / L was contained, it was reduced to 28 pg-TEQ / L in the effluent 2 of the accelerated oxidation reaction step. Further, S-COD and S-
The BOD was 8 mg / L and <2 mg / L, respectively, whereas the S-COD and S-BOD of the effluent were 95
mg / L and 85 mg / L, and the soluble component increased at the outlet compared to the inlet.

[0014]

[Table 2] The amount of sludge generated in the membrane filtration step 9 is 0.1 in this embodiment.
It was 18 kg / d. When the ozone treatment was not performed with the same amount of treated water, the amount of generated sludge was 0.54 kg / d, which reduced 0.36 kg of sludge per day, thereby reducing the amount of generated excess sludge.

Next, the processing in the membrane filtration step 9 will be described. In this example, activated sludge was added to the membrane
LSS was added so as to be 6000 mg / L, and powdered activated carbon was added so as to be 5000 mg / L. The hollow fiber membrane 10 used one unit having a nominal pore size of 0.4 μm and a nominal membrane area of 42 m ² . In order to stir the activated sludge and the powdered activated carbon and to supply oxygen to the activated sludge, aeration was always performed by the aeration blower 16. The suction filtration pump 14 was operated for 13 minutes and stopped for 2 minutes, and filtration was performed at a membrane permeation flux of about 0.2 m / d. Table 3 shows the water quality of the permeated water 3 from the membrane filtration step 9. From Table 3, COD is 2 mg / L or less and BOD is 5
mg / L or less. Dioxins were 1 pg-TEQ / L or less in membrane permeated water.

[Table 3]

Table 4 shows the water quality of the effluent water 4 in the activated carbon adsorption step in this embodiment. From Table 4, the COD of the activated carbon adsorption step effluent (treated water) is 2 mg / L or less, and the BOD is 5 m.
At g / L or less, good treated water as effluent was obtained.
In addition, dioxins are reduced to 1p in effluent from activated carbon adsorption process.
g-TEQ / L or less, which sufficiently satisfied the discharge standard.

[Table 4]

Example 2 In Example 2, dioxin-containing wastewater was treated according to the flow shown in FIG. First, the processing in the accelerated oxidation reaction step 7 will be described. In this embodiment, the ozone gas 6 supplied to the accelerated oxidation reaction
Was supplied at an ozone gas injection rate of about 50 mg / L in the accelerated oxidation reaction step 7. The residence time in the accelerated oxidation reaction step 7 was about 0.5 hour, and the intensity of ultraviolet light was 1 W · h / L. In addition, accelerated oxidation reaction step 7
The amount of water in the mixed solution of the membrane filtration tank supplied to the dioxin-containing wastewater 1 supplied to the accelerated oxidation reaction step 7 was substantially the same as the amount of water in the mixed liquid. Table 5 shows the water quality and amount of the dioxin-containing wastewater 1.

[Table 5]

Table 6 shows the results of the treatment in the accelerated oxidation reaction step 7. According to Table 6, in this example, 140 pg-TEQ / L of dioxins was contained in the membrane filtration tank mixture 5 and the dioxin-containing wastewater 1 in the accelerated oxidation reaction step 7 in the accelerated oxidation reaction step 7, 14pg-T
It decreased to EQ / L, about 90%.

[Table 6]

Next, the processing in the membrane filtration step 9 will be described. The hollow fiber membrane 10 used one unit having a nominal pore size of 0.4 μm and a nominal membrane area of 42 m ² . Aeration was always performed by the aeration blower 16 for stirring in the membrane filtration process. The suction filtration pump 14 was operated for 13 minutes and stopped for 2 minutes, and filtration was performed at a membrane permeation flux of about 0.2 m / d. Table 7 shows the quality of the permeated water 3 from the membrane filtration step 9. From Table 7, the COD was 2 mg / L or less and the BOD was 5 mg / L or less by the treatment in the membrane filtration step 9. Dioxins were 1 pg-TEQ / L or less in membrane permeated water.

[Table 7]

Table 8 shows the water quality of the effluent water 4 in the activated carbon adsorption step in this embodiment. From Table 8, the COD of activated carbon adsorption and effluent (treated water) is 2 mg / L or less, and the BOD is 5 mg / L.
/ L or less, good treated water as effluent was obtained. Dioxins are 1 pg-T in the effluent of the activated carbon adsorption tower.
It was equal to or less than EQ / L, which was enough to satisfy the discharge standard.

[Table 8]

Example 3 In Example 3, an endocrine disrupting substance (environmental hormone) among the COD components was obtained by the flow shown in FIG.
The wastewater containing was treated. In this example, nonylphenol-containing wastewater among environmental hormones was treated.
First, the processing in the accelerated oxidation reaction step 7 will be described. In the present embodiment, the ozone gas 6 supplied to the accelerated oxidation reaction step 7 was supplied such that the ozone gas injection rate in the enhanced oxidation reaction step 7 was about 5 mg / L. The residence time in the accelerated oxidation reaction step 7 was 0.25 hours, and the intensity of ultraviolet rays was 0.03 W · h / L. The amount of water in the mixed solution in the membrane filtration step supplied to the accelerated oxidation reaction step was almost the same as the amount of water in the nonylphenol-containing wastewater 1 supplied to the accelerated oxidation reaction step 7. Table 9 shows the water quality and amount of the nonylphenol-containing wastewater 1.

[Table 9]

Table 10 shows the results of the treatment in the accelerated oxidation reaction step 7. From Table 10, in this example, in the accelerated oxidation reaction step 7, nonylphenol was mixed with the mixed solution 5 in the membrane filtration step.
25 µg / L for nonylphenol-containing wastewater and 26 µg for wastewater containing nonylphenol
/ L, but 0.1% in the effluent water 2 of the accelerated oxidation reaction step.
It decreased to 5 μmg / L.

[Table 10]

Next, the processing in the membrane filtration step 9 will be described. The hollow fiber membrane 10 used one unit having a nominal pore size of 0.4 μm and a nominal membrane area of 42 m ² . The aeration blower 16 constantly aerated to agitate the activated sludge and the powdered activated carbon and to supply oxygen to the activated sludge. The suction filtration pump 14 was operated for 13 minutes and stopped for 2 minutes, and the membrane permeation flux at this time was about 0.2 m / d. Table 11 shows the water quality of the permeated water 3 from the membrane filtration step 9. From Table 11, COD was 2 mg / d by the treatment in the membrane filtration step 9.
L and BOD was 5 g / L or less. Nonylphenol was 0.5 μg / L or less in membrane permeated water.

[Table 11]

Table 12 shows the water quality of the effluent water 4 in the activated carbon adsorption step in this embodiment. From Table 12, the COD of the activated carbon adsorption step and the effluent (treated water) is 2 mg / L or less, and the BOD
With 5 mg / L or less, good treated water as effluent was obtained. In addition, nonylphenol was 0.5 μg / L or less in the water discharged from the activated carbon adsorption step, and 98% or more was removed.

[Table 12]

Example 4 The wastewater containing dioxins was treated according to the flow shown in FIG. 1000mg powdered activated carbon in the membrane filtration process
/ L. In this embodiment, the circulation pump (water intake) 15 takes a fixed amount of the mixed solution in the membrane filtration step into the storage tank, and after the circulation pump (water intake) 15 is stopped, accelerated oxidation treatment is performed. After the completion of the accelerated oxidation treatment, the promoted oxidation treatment water is returned to the membrane filtration step by a circulation pump (return water) 15 ″. In the accelerated oxidation treatment, the liquid to be treated is stored in a storage tank, a main reaction tank, and an ultraviolet lamp unit. The operation conditions are shown below.

Raw water (dioxin-containing wastewater) Raw water flow rate 24 m ³ / day Dioxin concentration 20 pg-TEQ / L Membrane treatment step Volume 10 m ³ Membrane pore diameter 0.4 μm Membrane area 160 m ² Promoted oxidation reaction step Storage Tank capacity 2.5m ³・ Circulation pump (promoted oxidation treatment) flow rate 42L / min ・ Main reaction tank capacity 80L ・ UV lamp input power 130W ・ Ozone gas injection condition 8g / hr ・ Processing time 22hr

As a result of the treatment under the above-mentioned conditions, the dioxin concentration is generally as shown below, and the dioxin concentration in the mixed solution in the membrane treatment step is 200 to 250 p.
The stable state was maintained in the range of g-TEQ / L. As a result, the amount of dioxins separated and concentrated in the membrane treatment process and the amount of dioxins decomposed in the accelerated oxidation treatment process are balanced, and the concentration of dioxins in the mixed solution of the membrane treatment process is stabilized, so that the amount of dioxins outside the device is reduced. Dioxin emissions were completely eliminated. From the above results, it was confirmed that the effect of the present invention does not change even when the circulating water supply from the membrane treatment step to the accelerated oxidation treatment step is performed intermittently and the accelerated oxidation treatment is performed batchwise. . Dioxin concentration in accelerated oxidation treatment • 250 pg-TEQ / L before accelerated oxidation treatment • 47 pg-TEQ / L after accelerated oxidation treatment Dioxin concentration in mixed solution of membrane treatment process 200 to 250 pg-TEQ / L Membrane permeated water (treated water) Dioxin concentration 1pg-TEQ / L or less

[0028]

According to the present invention, in the treatment of organic wastewater or industrial wastewater, organic wastewater containing a hardly decomposable organic compound such as dioxins is allowed to flow into the accelerated oxidation reaction step, and from the accelerated oxidation reaction step. Effluent is preferably supplied to a membrane filtration step having at least one of powdered activated carbon and activated sludge and incorporating a hollow fiber membrane, and the membrane filtration step is constantly aerated, and the The dioxins are adsorbed by powdered activated carbon or activated sludge if a mixture of the above is constantly flowed. In addition, all the suspended substances in the membrane filtration step are separated and removed by suction filtration using the hollow fiber membrane, so that suspended dioxins can be separated from suspended substances and dioxins in the wastewater. . Even when the non-suspendable dioxins remain in the permeated water, the non-suspendable dioxins can be adsorbed and removed in the activated carbon adsorption step provided after the membrane filtration step. The membrane permeated water from the membrane filtration step is allowed to flow into the activated carbon adsorption step. However, since the membrane permeated water does not contain suspended substances, the activated carbon adsorption step has an effect of preventing clogging by suspended substances.

Also, even if a hardly decomposable organic compound such as dioxins remains in the permeated water, dioxins are adsorbed and removed in the activated carbon adsorption step, so that treated water from which dioxins have been removed must be obtained. Can be. Also,
When the mixed liquid in the membrane filtration step from the inside of the membrane filtration step is supplied to the accelerated oxidation reaction step in which at least ozone gas is injected, the activated sludge in the mixed liquid in the membrane filtration step can be decomposed into liquefied organic matter that is easily metabolized by living organisms. Further, by flowing the treatment liquid in the ozone reaction step into the membrane filtration step, the liquefied organic matter can be mineralized by activated sludge in the membrane filtration step. From the above, since the activated sludge in the membrane filtration step can be mineralized, the amount of excess sludge generated can be reduced. Further, since ozone gas is injected into the mixed solution of the membrane filtration step from the inside of the membrane filtration step, organic compounds containing dioxins contained in the mixed solution of the membrane filtration step can be oxidatively decomposed. As described above, in the present invention, since dioxins contained in organic wastewater containing dioxins can be decomposed and removed and adsorbed and removed, there is an effect that discharge of dioxins outside the present apparatus can be reduced or eliminated. .

[Brief description of the drawings]

FIG. 1 is a flow diagram showing an example for carrying out a method for treating wastewater containing a hardly decomposable organic compound according to the present invention.

FIG. 2 is a flow diagram showing another example for carrying out the method for treating wastewater containing a hardly decomposable organic compound according to the present invention.

FIG. 3 is a flowchart showing an example of a conventional method for treating dioxin-containing wastewater.

[Explanation of symbols]

1: wastewater containing a hardly decomposable organic compound, 2: effluent of an accelerated oxidation reaction step, 3: membrane permeated water, 4: effluent of an activated carbon adsorption step (treated water), 5: mixed liquid of a membrane filtration step, 6: ozone gas,
7: accelerated oxidation reaction step, 8: ultraviolet lamp, 9: membrane filtration step, 10: hollow fiber membrane, 11: diffuser tube, 12: activated carbon adsorption step, 13: ozone gas generator, 14: suction filtration pump, 15, 15 ', 15 ": circulation pump, 16: aeration blower, 17: storage tank, 18: main reaction tank, 19: ultraviolet unit, 20: circulation path of the advanced oxidation reaction process

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) C02F 3/08 C02F 3/08 B 4H006 3/12 3/12 V 9/00 501 9/00 501C 502 502E 502H 502R 503 503C 504 504A 504E C07B 35/06 C07B 35/06 37/06 37/06 C07C 39/06 C07C 39/06 // C07D 319/24 C07D 319/24 (72) Inventor Toshihiro Tanaka Fujisawa, Kanagawa 4-2-1 Motofujisawa, Ebara Research Institute, Inc. (72) Inventor Takuya Kobayashi 4-2-1, Fujisawa, Fujisawa-shi, Kanagawa F-term in Ebara Research Institute, Inc. 4D003 AA14 AB02 BA02 CA02 EA14 EA25 FA06 4D006 GA06 HA01 KA01 KA72 KB12 KB22 MA01 PB08 PB70 4D024 AA04 AB04 AB11 BA02 BB01 BC01 CA01 DB05 DB10 DB15 DB24 4D028 AB00 BC03 BC17 BD17 4D050 AA13 AA15 AB15 AB19 BB02 BC09 BD06 CA06 CA09 CA17 4H006 AA05 AC13 AC26 AD17 AD19 BE31 FC52 FE13

Claims (5)

[Claims] 1. A method for treating wastewater containing a hardly decomposable organic compound, wherein the liquid to be treated is treated while partially circulating between a membrane filtration step having a separation membrane and an accelerated oxidation reaction step, A method for treating wastewater containing a hardly decomposable organic compound, comprising obtaining permeated water from the membrane filtration step as treated water. 2. The liquid to be treated in the membrane filtration step is characterized in that powdered activated carbon and / or activated sludge is added, and the liquid to be treated is always fluidized by constantly aerating the filtration step. The method for treating wastewater containing a hardly decomposable organic compound according to claim 1. 3. The wastewater containing a hardly decomposable organic compound according to claim 1, wherein the permeated water from the membrane filtration step is passed through an activated carbon adsorption step, and the effluent is treated water. Processing method. 4. The method for treating wastewater containing a hardly decomposable organic compound according to claim 1, wherein the accelerated oxidation reaction step includes an ozone reaction step of injecting at least ozone. 5. An apparatus for treating wastewater containing a hardly decomposable organic compound, comprising: a membrane filtration tank provided with a separation membrane containing a liquid to be treated having powdered activated carbon and / or activated sludge; A promoted oxidation reaction tank that decomposes, and a circulation path through which the liquid to be treated circulates between the membrane filtration tank and the promoted oxidation reaction tank, and treated water is obtained through membrane permeated water that has passed through the separation membrane of the membrane filtration tank. An apparatus for treating wastewater containing a hardly decomposable organic compound, comprising an activated carbon adsorption tower.