JP2008030009A - Method and apparatus for purifying polluted waste water - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the problem that there is hardly found a technique to remove an organic foreign object and to purify the waste water despite a technique conventionally found to be effective in its own way in treating an oil content or a floating foreign object etc. among foreign objects in polluted waste water. <P>SOLUTION: A fluid mixture of water and air containing much of oxygen is blown into the polluted waste water 201, thereby dissolving the oxygen into the polluted waste water 201 and simultaneously to produce minute bubbles 10z containing much of the oxygen in the polluted waste water. Then the foreign object in the polluted waste water 201 adheres to the surface of the minute bubble 10z containing much of the oxygen and rises to the waste water surface as a floating foreign object 202. Thus the foreign object is removed from the polluted waste water 101 containing organic matter which has scarcely been treated conventionally. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a cleaning method and a cleaning processing apparatus for dirty wastewater. More specifically, the present invention feeds a mixed fluid of air and water in which a large amount of oxygen gas is mixed into the dirty wastewater. Oxygen gas is dissolved in dirty wastewater, and at the same time, microbubbles containing a large amount of oxygen gas are generated, and foreign substances contained in the dirty wastewater adhere to the surface of the microbubbles containing a large amount of oxygen gas. This article describes a technology related to a cleaning treatment apparatus that removes foreign matters contained in dirty wastewater containing organic substances that have hardly been treated by floating on the liquid surface as foreign matters.

  As a conventional technology related to the purification method and apparatus for dirty wastewater, it is included in the drain water due to the difference in specific gravity, as seen in the oil-water separation method and oil-water separation device for drain water generated from compressed air. The foreign matter contained in the drain water adheres to the surface of the fine bubbles that appeared by releasing the high-concentration air solution while the oil is separated, thereby removing the foreign matter floating on the water surface together with the oil There was a technique of the contents to be done (see, for example, Patent Document 1).

In this case, Patent Document 1 discloses an oil / water separation tank that separates oil contained in drain water due to a difference in specific gravity, and a fine bubble is created in the oil / water separation tank so that foreign substances contained in the drain water adhere to the surface. A vortex pump that sucks air and drain water, mixes, stirs, and pressurizes to send out a high-concentration air solution to the oil / water separation tank for the purpose of removing foreign matter floating on the water surface together with oil The technology which constituted the separation tank which isolate | separates a big bubble downstream is described.
JP2004-034013

  However, the conventional oil-water separation method and apparatus for separating water generated from compressed air have the following problems.

  In other words, among foreign matters contained in dirty wastewater, some effects were seen with respect to oil and floating foreign matters, but the technology to remove and clean almost all organic foreign matters is I couldn't see it.

  Also, little consideration has been given to the foreign matter that has surfaced in order to discharge the foreign matter.

  According to the present invention, in the cleaning method for dirty wastewater, when a mixed fluid of air and water in which a large amount of oxygen gas is mixed is sent to the dirty wastewater 201, thereby dissolving the oxygen gas in the dirty wastewater 201. At the same time, a minute bubble 10z containing a large amount of oxygen gas is generated, and the foreign matter contained in the dirty waste water 201 is adhered to the surface of the minute bubble 10z containing a large amount of oxygen gas. It is characterized by removing foreign matters contained in the dirty wastewater 101 by floating, and further, the mixed fluid is produced by mixing, stirring and pressurizing, and The oxygen-rich air uses oxygen-enriched air separated by compressed air passing through the separation membrane 20, and the water is contaminated with The waste water 201 is circulated. Further, when the foreign matter contained in the dirty waste water 201 is an organic substance, the dissolved oxygen gas is consumed when oxidation and decomposition are performed. The above-mentioned problem has been solved by removing the organic matter by the method described above.

  Further, the present invention provides a dirty wastewater cleaning apparatus, in which in addition to storing the dirty wastewater 201, dirty wastewater that floats foreign matter lighter than water as the floating foreign matter 202 and sinks the clean water 203 at the bottom. In order to dissolve the oxygen gas in the storage tank 10 and the dirty waste water storage tank 10 and simultaneously generate minute bubbles 10z in which a large amount of oxygen gas is mixed, the gas and the liquid are mixed and stirred and pressurized. The gas-liquid mixing pump 40 for sending the mixed fluid to the dirty waste water storage tank 10 later, and the dirty waste water storage tank 10 as a liquid at a confluence 100a located upstream of the gas-liquid mixing pump 40 The clean water 203 constituting a part of the dirty waste water 201 and oxygen-enriched air from the oxygen gas supply device 20 are combined as a gas, and further, the gas-liquid mixture A separation tank 50 for separating large bubbles contained in the mixed fluid is disposed downstream of the pump 40, and further, foreign matters contained in the dirty waste water 201 are converted into minute bubbles 10z in which a large amount of oxygen gas is mixed. The floating foreign matter 202 is floated on the liquid surface by being attached, and the floating foreign matter 202 is collected by the floating foreign matter collecting means 11c, 102, 51. Furthermore, the floating foreign matter collecting means 11c, Reference numerals 102 and 51 denote a floating foreign matter discharge port 11c formed in the storage tank main body 11 constituting the dirty wastewater storage tank 10 and a floating foreign matter discharge pipe 102 connected to the floating foreign matter discharge port 11c, if necessary. The floating foreign matter discharge valve 51 that can be manually opened and closed and the floating foreign matter feeding means for feeding the floating foreign matter 202 to the floating foreign matter discharge port 11c. Further, the oxygen gas supply device 20 is a separation membrane 20 that can be produced by separating oxygen-enriched air from compressed air. When the foreign matter contained in the dirty waste water 201 is an organic substance, the organic substance is removed by consuming the dissolved oxygen gas during oxidation and decomposition. One end of the dirty wastewater storage tank 10 is opened as a suction port, the other end is opened to the atmosphere, and the other end is connected to a clean water discharge port 11d located at the same height as the liquid level. The above problem has been solved by using the discharge pipe 12 for discharging.

  As is clear from the above description, the present invention can provide the following effects.

  First, a mixed fluid of air and water containing a large amount of oxygen gas is sent to dirty wastewater, thereby dissolving oxygen gas in the dirty wastewater and simultaneously generating minute bubbles containing a large amount of oxygen gas. By attaching foreign substances contained in dirty wastewater to the surface of minute bubbles containing a large amount of gas and then floating on the liquid surface as floating foreign substances, oil contained in dirty wastewater and floating foreign substances are removed. In addition to the removal, it has become possible to remove organic substances that have been hardly treated.

  Secondly, the mixed fluid is created by a gas-liquid mixing pump capable of mixing, stirring, and pressurizing water, which is a gas, and water, which is a liquid, thereby more reliably dissolving oxygen gas. At the same time, it has become possible to generate minute bubbles containing a large amount of oxygen gas.

  Third, air containing a large amount of oxygen gas is oxygen-enriched air that is separated by compressed air passing through a separation membrane. It has become possible to produce chemical gas, and unlike the case of using an oxygen gas cylinder, the replacement work of the cylinder and the like is completely unnecessary after only installing the facility according to the present invention once.

  Fourthly, water as liquid is due to the circulation of dirty wastewater, and in particular, the flow of foreign matter into the gas-liquid mixing pump by circulating clean water that forms part of the dirty wastewater. This makes it possible to create a device with less worries.

  Fifth, when the foreign matter contained in the dirty wastewater is organic matter, the organic matter is removed by consuming the dissolved oxygen gas at the time of oxidation and decomposition. It became possible to make dirty wastewater, including the organic matter that had not been, clean water.

  Sixth, the floating foreign matter collecting means includes a floating foreign matter discharge port formed in the storage tank body constituting the dirty wastewater storage tank, a floating foreign matter discharge pipe connected to the floating foreign matter discharge port, and a manual as necessary. The floating foreign matter discharge valve that can be opened / closed by the lift and the floating foreign matter feed means for sending the floating foreign matter to the floating foreign matter discharge port make it possible to collect the floating foreign matter more reliably.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
Here, FIG. 1 is a diagram showing the whole of the present invention.

  As shown in FIG. 1, reference numeral 20 denotes a separation membrane, which is also an oxygen gas supply device 20 and can separate oxygen-enriched air from compressed air that is a mixed gas, and receives compressed air from an air compressor 30. A compressed air pipe 110, a nitrogen gas pipe 111 that discharges high-concentration nitrogen gas 204, and an oxygen-enriched gas pipe 109 that separates and sends out an oxygen-enriched gas rich in oxygen gas are connected. Therefore, the oxygen-enriched gas can separate a compressed air, and can send out a gas having a considerably high pressure.

  By the way, the separation membrane 20 is made of polyester and bundled with thousands of straw-shaped hollow fibers having a pore diameter of about 300 μm, and various gases such as compressed air are mixed inside the hollow fibers. By passing the above, each gas mixed can be separated by utilizing the difference in permeation speed of the hollow fiber membrane that each gas has inherently.

  In this case, the components of each gas constituting the compressed air are released from the gas that is released quickly by utilizing the difference in permeation amount (from the viewpoint of release) with respect to the hollow fiber membrane that is the separation membrane 20. In the presence of difficult gas, it is difficult to release and the remaining gas will flow downstream.

  In particular, when the hollow fiber membrane, which is the separation membrane 20, is made of polyester, water vapor is most permeable, followed by hydrogen gas and helium gas, and finally oxygen gas, argon gas, and nitrogen. The gas remains as the gas that is most difficult to permeate, and the nitrogen gas is the gas that is most difficult to permeate, so that the high-concentration nitrogen gas 204 is discharged to the nitrogen gas pipe 111.

  Therefore, the oxygen-enriched gas containing a large amount of oxygen gas permeated at an early time flows through the oxygen-enriched gas pipe 109.

  As the hollow fiber membrane, in addition to polyester, resins such as polyimide, polyolefin, and polypropylene are also conceivable.

  However, the oxygen gas supply device 20 does not need to be limited to the separation membrane 20, and uses an oxygen gas cylinder or oxygen gas generated by electrolysis of water and pressurized as necessary. It doesn't matter.

  On the other hand, on the downstream side of the oxygen-enriched gas pipe 109, an on-off valve 52 that can manually open and close the flow of fluid at that location and an oxygen-enriched gas pipe 108 are connected, and a dirty wastewater storage tank is connected. Therefore, the suction pipe 104 from 10 and the joining point 100 a are joined together to flow into the joining pipe 105.

  Although not specifically illustrated, it is necessary to provide a backflow prevention valve in each of the suction pipe 104 and the oxygen-enriched gas pipe 108 immediately before joining for the purpose of preventing backflow from the joining point 100a. This is very meaningful from the viewpoint of preventing adverse effects caused by the flow of fluid to the place where it is not.

  By the way, the suction pipe 104 is formed in the storage tank main body 11 constituting the storage tank 10 of the dirty waste water for the purpose of circulating the clean water 203 at the bottom part of the dirty waste water 201. It is connected to the suction port 11b. After joining at the junction 100a with the oxygen-enriched gas pipe 108, a high concentration is obtained by sucking, mixing, stirring, and pressurizing the joining pipe 105, gas and liquid. A gas-liquid mixing pump 40 for sending a mixed fluid in which oxygen gas is dissolved, a mixed fluid pipe 106, a separation tank 50 for removing large bubbles in the mixed fluid sucked, mixed, stirred and pressurized, and a mixed fluid pipe 107 is connected to the discharge port 11a formed in the storage tank main body 11 constituting the dirty waste water storage tank 10 on the outside, and mixed and stirred from the discharge pipe 13 connected to the discharge port 11a on the inside. Pressurization The discharged mixed fluid is discharged to the dirty waste water 201 in the dirty waste water storage tank 10 at a reduced pressure, so that the oxygen gas is dissolved and at the same time, micro bubbles 10z in which a large amount of oxygen gas is mixed are generated. The oxygen gas is dissolved in the water in the dissolution tank 20 by the minute bubbles 10z or the like in which a large amount of oxygen gas is mixed.

  At the same time, by generating minute bubbles 10z in which a large amount of oxygen gas is mixed, the foreign matter contained in the dirty waste water 201 is attached to the surface of the minute bubbles 10z in which a large amount of oxygen gas is mixed. By floating on the surface, foreign substances contained in the dirty wastewater 101 can be easily removed.

  In this case, the gas-liquid mixing pump 40 may be of any type as long as it creates a mixed fluid in which high-purity oxygen gas is dissolved by sucking, mixing, stirring, and pressurizing gas and liquid. Of course, it is best to use a vortex turbine pump, especially for mixing air that contains a lot of water and oxygen gas.

  In addition, although not specifically illustrated, by connecting an exhaust pipe and an opening / closing valve to the upper part of the separation tank 50, it is possible to remove large bubbles accumulated in the upper part of the separation tank 50 depending on the situation. It has become.

  Furthermore, when discharging the mixed fluid sucked, mixed, stirred, and pressurized into the dirty waste water 201 in the dirty waste water storage tank 10 while reducing the pressure at once, it is preferable to discharge while suppressing the flow rate of the mixed fluid. .

  In addition, the dirty waste water 201 flows into the dirty waste water storage tank 10 from the dirty waste water inflow pipe 101 and is stored therein. In addition, foreign substances such as oil that floats with a specific gravity lighter than water, floating substances, and various foreign substances attached to the surface of minute bubbles 10z in which a large amount of oxygen gas is mixed are stored as waste water storage tanks contaminated as floating foreign substances 202. Ascend to the liquid level of 10. Furthermore, foreign substances having a specific gravity heavier than that of the clean water 203 sink to the bottom of the dirty wastewater storage tank 10.

  In this case, the clean water 203 is a clean water whose one end is opened at the bottom of the dirty wastewater storage tank 10 as an inlet and the other end is opened to the atmosphere, and the other end is located at the same level as the liquid level. The discharge pipe 12 connected to the water discharge port 11d can be discharged.

  On the other hand, the floating foreign matter 202 can collect the floating foreign matter 202 floating on the liquid surface by the floating foreign matter collecting means 11c, 102, 51. Here, the floating foreign matter collecting means 11c, 102, 51 are the floating foreign matter discharge port 11c formed in the storage tank body 11 constituting the dirty waste water storage tank 10, and the floating surface connected to the floating foreign matter discharge port 11c. For the purpose of definitely sending the foreign matter discharge pipe 102, the floating foreign matter discharge valve 51 that can be manually opened and closed as necessary, and the floating foreign matter 202 to the floating foreign matter discharge port 11c without fail, a fixed flow path is provided. Is formed by floating foreign substance feeding means arranged so as to be easily formed.

  Although not shown in detail, the floating foreign substance feeding means is a reciprocable movement so that the floating foreign substance 202 floating on the liquid surface can easily form a fixed channel toward the floating foreign substance discharge port 11c. The plate of the waste water storage tank 10 with a dirty plate is reciprocated between an arbitrary position of the liquid level in the waste water storage tank 10 and the floating foreign matter discharge port 11c, or by any power such as a pump or compressed air. One side of the flow path is formed so that a fixed flow path toward the floating foreign matter discharge port 11c is formed at the liquid level or the liquid level of the waste water storage tank 10 where the flow is contaminated along the flow path is directed to the floating foreign matter discharge port 11c. It is conceivable to provide narrow plates on both sides.

  Furthermore, regarding the positional relationship between the floating foreign matter discharge port 11c and the clean water discharge port 11d, it is conceivable that both of them are set to the same height as the liquid level, or only the floating foreign matter discharge port 11c is slightly higher than the liquid level. . In particular, when a floating foreign material feeding means is provided, it is meaningful to make only the floating foreign material discharge port 11c slightly higher than the liquid level by considering the specific gravity relationship between oil and water.

  The method and apparatus for cleaning dirty wastewater according to the present invention is configured as described above, and the operation thereof will be described below.

  First, by operating the air compressor 30 to flow compressed air from the compressed air pipe 110 to the separation membrane 20 that is the oxygen gas supply device 20, the nitrogen gas pipe 111 is enriched with high-concentration nitrogen gas 204. In the gas pipe 109, the oxygen-enriched gas can be separated.

  In this case, by separating the oxygen-enriched gas from the compressed air by the air compressor 30, an oxygen-enriched gas having a pressure higher than the pressure of the liquid flowing through the suction pipe 104, the merge pipe 105, and the mixed fluid pipes 106 and 107 can be easily obtained. In other words, the gas can be supplied from the oxygen-enriched gas pipe 108 and merged.

  In addition, when a backflow prevention valve is provided at any location of the oxygen-enriched gas pipe 108, the oxygen-enriched gas from the junction 100 a side where the suction pipe 104 and the junction pipe 105 are connected to the separation membrane 20 side. Further, the clean water 203 is prevented from flowing back. Further, when a backflow prevention valve is provided at any location of the suction pipe 104, the oxygen-enriched gas and the clean water 203 are prevented from flowing back to the storage tank 10 side of the dirty wastewater.

  On the other hand, starting from the dirty wastewater storage tank 10, the suction pipe 104, the merging pipe 105, the gas-liquid mixing pump 40, the mixed fluid pipe 106, the separation tank 50, and the mixed fluid pipe 107 from the dirty wastewater storage tank 10. In addition, the oxygen-enriched gas pipe 109 passes through the on-off valve 52 and the oxygen-enriched gas pipe 108 in a piping path that circulates in the discharge pipe 13 and the dirty wastewater storage tank 10. The merging point 100 a joins the suction pipe 104 and flows into the gas-liquid mixing pump 40 from the merging pipe 105.

  Here, in the gas-liquid mixing pump 40, the oxygen-enriched gas from the separation membrane 20 in which a large amount of gaseous oxygen gas is mixed and the bottom part of the dirty waste water 201 that is liquid are partly formed. The clean water 203 is suctioned, mixed, stirred and pressurized to produce a mixed fluid in which high-concentration oxygen gas is dissolved. In the separation tank 50, the mixed fluid is generated from the mixed fluid in which high-concentration oxygen gas is dissolved. The relatively large bubbles are separated and discharged to the upper part of the separation tank 50, and in the dirty waste water storage tank 10, the dirty waste water while reducing the pressure of the pressurized high-concentration oxygen gas at once. By discharging into the storage tank 10, the oxygen gas is dissolved while generating fine bubbles 10 z in which a large amount of oxygen gas is mixed in the dirty wastewater 201 in the dirty wastewater storage tank 10.

  In the gas-liquid mixing pump 40, a mixed fluid in which high-concentration oxygen gas is dissolved is created by sucking, mixing, stirring, and pressurizing the mixed fluid of gas and liquid. In the storage tank 10, supersaturated oxygen gas dissolved in water is deposited by discharging a mixed fluid in which high-concentration oxygen gas, which has been sucked, mixed, stirred, and pressurized, is decompressed at once. There is no worry.

  Then, a mixed fluid of air and water in which a large amount of oxygen gas is mixed into the dirty wastewater 201 is sent, so that the oxygen gas is dissolved in the dirty wastewater 201 and at the same time, minute bubbles 10z in which a large amount of oxygen gas is mixed are generated. The foreign matter contained in the dirty wastewater 101 is adhered to the surface of the minute bubbles 10z in which a large amount of oxygen gas is mixed, and further floated on the liquid surface as the floating foreign matter 202, so that the foreign matter contained in the dirty wastewater 101 is removed. It can be removed.

  By the way, various matters can be considered as items for specifying the cause of the dirty wastewater 201. If the contents are specifically shown here, biochemical oxygen demand, chemical oxygen demand, suspended solids quantity in terms of hydrogen ion concentration, presence of organic matter in terms of oxygen demand during oxidation and decomposition Normal hexane extractable substance content (minerals content), normal hexane extractable substance content (animal and vegetable oils and fats content), phenols content, content of various minerals and gases, coliform group number, and the like.

  In general, the above contents are dealt with according to various situations. For example, the amount of suspended solids is dealt with by the difference in specific gravity between the filter and water, and the content of normal hexane extractables (minerals content) is different from the specific gravity difference between the filter and water and the oil adsorbent. This is done by adhering to emulsion breaking particles, emulsion breaking oil adsorbents and fine bubbles.

  In this case, in the present invention, the amount of suspended solids corresponds to the difference in specific gravity with water, and the normal hexane extractable substance content (mineral content) is different from the specific gravity difference with water. As described above, it is possible to cope with the problem by adhering to fine bubbles. However, regarding the organic matter, the present invention intends to cope with oxygen gas dissolved in the dirty sewage 201. It is a feature of.

  In other words, when aerobic microorganisms are present in the dirty wastewater 201, the dissolved oxygen gas is consumed to effect oxidation and decomposition on the organic matter contained in the dirty wastewater 201 as a cause of the contamination. In this case, as a result of the action of oxidation and decomposition of the organic matter, the organic matter that is contaminated and harmful odors is converted into a non-odorous or less harmless or almost harmless substance to remove the organic matter. Is possible. Therefore, cleaning of the dirty sewage 201 is achieved.

  Furthermore, a part of the harmless or almost harmless substance having no odor adheres to the minute air 10z in which a large amount of oxygen gas is mixed and floats as a floating foreign substance 202 on the liquid surface. It can also be treated in the same way as the oils mentioned.

  In addition, it is effective in the case of the discharged water discharged | emitted in the public water areas other than the sea area and a lake to perform the effect | action of oxidation and decomposition | disassembly with respect to organic substance in this way.

  Finally, as a measure of one value for consuming oxygen in such a device, in the case of the device of the present invention, it is possible to present a value of about 160 ppm in the manner of being stored sealed at 20 ° C. for 5 days. It is.

  The present invention relates to a cleaning method and a cleaning processing apparatus for dirty wastewater, and in particular, oxygen gas is actively dissolved in wastewater not only for oil and solid foreign substances but also for organic waste. Therefore, it tried to make clean water by oxidation and decomposition.

  Diagram showing the entire invention of the present application

Explanation of symbols

10 ······ Storage tank 10z for dirty waste water ·································································· ..Suction port 11c ... Floating foreign matter discharge port (floating foreign matter collecting means)
11d: Clean water discharge port 12 ... Discharge pipe 13 ... Release pipe 20 ... Separation membrane (oxygen gas supply device)
30 ... Air compressor 40 ... Gas / liquid mixing pump 50 ... Separation tank 51 ... Floating foreign matter discharge valve (Floating foreign matter collecting means)
52... On-off valve 100 a... Confluence 101... Dirty waste water inflow pipe 102.
103 ... Clean water discharge pipe 104 ... Suction pipe 105 ... Merging pipe 106 ... Mixed fluid pipe 107 ... Mixed fluid pipe 108 ... Oxygen-enriched gas pipe 109 ... Oxygen-enriched gas pipe 110 ... Compressed air pipe 111 ... Nitrogen gas pipe 201 ... Dirty waste water 202 ... Floating Foreign matter 203 ... clean water 204 ... high concentration nitrogen gas

Claims (9)

  In the method for purifying dirty wastewater, when a mixed fluid of air and water in which a large amount of oxygen gas is mixed is sent to the dirty wastewater (201), thereby dissolving the oxygen gas in the dirty wastewater (201). At the same time, micro bubbles (10z) containing a large amount of oxygen gas are generated, and foreign substances contained in the dirty waste water (201) are attached to the surface of the micro bubbles (10z) containing a large amount of oxygen gas, A method for purifying dirty wastewater, wherein the foreign matter contained in the dirty wastewater (101) is removed by floating on the liquid surface as a floating foreign matter (202).   The said mixed fluid is produced by mixing, stirring, and pressurizing, The cleaning process method of the dirty wastewater of Claim 1 characterized by the above-mentioned.   The air containing a large amount of oxygen gas uses oxygen-enriched air separated by compressed air passing through the separation membrane (20), and the water circulates the dirty waste water (201). The method for purifying dirty wastewater according to claim 1 or 2, characterized in that   When the foreign matter contained in the dirty waste water (201) is an organic substance, the organic substance is removed by consuming oxygen gas dissolved during oxidation and decomposition. Item 4. The method for purifying dirty wastewater according to any one of Items 3 to 4.   In the dirty wastewater cleaning treatment apparatus, in addition to storing the dirty wastewater (201), a foreign substance that is lighter than water floats up as a floating foreign substance (202) and the clean water (203) sinks to the bottom. In order to generate oxygen bubbles in the wastewater storage tank (10) and the dirty wastewater storage tank (10) and to generate minute bubbles (10z) containing a large amount of oxygen gas, gas and liquid are mixed. A gas-liquid mixing pump (40) for feeding a mixed fluid to the dirty waste water storage tank (10) after stirring and pressurizing, and a confluence point located upstream of the gas-liquid mixing pump (40) ( 100a) from the oxygenated water supply device (20) as the clean water (203) and gas as part of the dirty waste water (201) from the dirty waste water reservoir (10) as a liquid Combine oxygen-enriched air Cleaning process apparatus dirty waste water, characterized in that is.   A separation tank (50) that separates large bubbles contained in the mixed fluid is disposed downstream of the gas-liquid mixing pump (40), and foreign substances contained in the dirty waste water (201) are further removed from the oxygen. By adhering to minute bubbles (10z) in which a large amount of gas is mixed, the floating foreign matter (202) floats on the liquid surface, and the floating foreign matter (202) is collected by the floating foreign matter collection means (11c, 102, 51). 6. The apparatus for purifying dirty wastewater according to claim 5, which is configured as described above.   The floating foreign matter collecting means (11c, 102, 51) includes a floating foreign matter discharge port (11c) formed in the storage tank main body (11) constituting the dirty wastewater storage tank (10) and the floating foreign substance. The floating foreign matter discharge pipe (102) connected to the discharge port (11c), the floating foreign matter discharge valve (51) that can be manually opened and closed as necessary, and the floating foreign matter (202) are further connected to the floating foreign matter discharge port ( The apparatus for purifying dirty wastewater according to claim 6, characterized by comprising floating foreign substance feeding means for feeding to 11c).   The oxygen gas supply device (20) is a separation membrane (20) that can be created by separating oxygen-enriched air from compressed air. The apparatus for purifying dirty wastewater as described in the item.   When the foreign matter contained in the dirty waste water (201) is an organic substance, the organic substance is removed by consuming oxygen gas dissolved during oxidation and decomposition, and the clean water (203) Is a clean water discharge port which is open at the bottom of the dirty waste water storage tank (10) with one end as an inlet and the other end to the atmosphere and the other end at the same level as the liquid level. The apparatus for purifying dirty wastewater according to any one of claims 5 to 8, wherein the apparatus is discharged by a discharge pipe (12) connected to (11d).

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