WO2022074740A1 - Appareil et procédé de traitement des eaux usées - Google Patents

Appareil et procédé de traitement des eaux usées Download PDF

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Publication number
WO2022074740A1
WO2022074740A1 PCT/JP2020/037893 JP2020037893W WO2022074740A1 WO 2022074740 A1 WO2022074740 A1 WO 2022074740A1 JP 2020037893 W JP2020037893 W JP 2020037893W WO 2022074740 A1 WO2022074740 A1 WO 2022074740A1
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Prior art keywords
water
ozone
treated
micro
air
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PCT/JP2020/037893
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English (en)
Japanese (ja)
Inventor
正志 豊岡
雅史 岡村
孝雄 小海
Original Assignee
エンバイロ・ビジョン株式会社
エンバイロ・ソリューション株式会社
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Application filed by エンバイロ・ビジョン株式会社, エンバイロ・ソリューション株式会社 filed Critical エンバイロ・ビジョン株式会社
Priority to JP2022555007A priority Critical patent/JP7450898B2/ja
Priority to PCT/JP2020/037893 priority patent/WO2022074740A1/fr
Publication of WO2022074740A1 publication Critical patent/WO2022074740A1/fr

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    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/72—Treatment of water, waste water, or sewage by oxidation
    • C02F1/78—Treatment of water, waste water, or sewage by oxidation with ozone

Definitions

  • the present invention relates to a wastewater treatment apparatus and a wastewater treatment method for treating wastewater including organic wastewater discharged from a complex building of a cooperative business system, food, chemicals, papermaking, automobile factories, etc.
  • Such ozone is effectively mixed with sewage by foaming to a minute diameter by a bubble generator or the like to promote the decomposition of organic matter in the sewage, and then most of the large number of ozone bubbles are crushed over time. It is known to disappear.
  • Patent Document 1 ozone treatment for sterilizing organic substances contained in sewage is performed by supplying ozone to the treatment tank, but this ozone treatment can obtain a certain sterilizing effect. There is a problem that it is difficult to achieve sufficient purification of the water to be treated because it lacks the denitrifying effect of reducing the nitrogen component which causes eutrophication contained in the water to be treated.
  • the present invention has been made focusing on such problems, and in addition to the decomposition treatment of organic substances in the water to be treated with ozone or the sterilizing effect of sterilizing the organic substances, a sufficient denitrification effect of the water to be treated can be obtained. It is an object of the present invention to provide a wastewater treatment apparatus and a wastewater treatment method capable of providing a wastewater treatment method.
  • the wastewater treatment apparatus of the present invention is used. It is characterized in that it is composed of at least a storage tank for accommodating water to be treated and a supply means for supplying micro-nano bubbles containing at least ozone, oxygen and ⁇ particles in the storage tank.
  • organic substances dissolved or suspended in the water to be treated are decomposed or sterilized by micro-nano bubbles of ozone in the storage tank, and the bubbles of residual ozone floating in the water to be treated are chemically converted into oxygen molecules.
  • residual ozone can be reduced, and at the same time, decomposition of organic substances can be promoted together with oxygen contained in micro-nano bubbles.
  • the micro-nano bubbles containing the ⁇ particles float in the water to be treated, the ⁇ particles act on a wide range without being attenuated, and the denitrification effect can be enhanced.
  • the supply means is characterized by having an introduction pipe having an opening for introducing air, an ozone generating portion communicating with the introduction pipe, and an ⁇ ray source portion for supplying ⁇ particles to the air. According to this feature, an air-fuel mixture can be easily generated by giving ⁇ -particles to the oxygen-containing air introduced into the introduction pipe by the ⁇ -ray source and mixing ozone.
  • the ⁇ -ray source portion is characterized in that it is provided inside the introduction pipe. According to this feature, ⁇ particles can be stably supplied only by circulating air in the introduction pipe.
  • the ⁇ -ray source portion is characterized by being composed of a network member in which a large number of meshes are formed and an ⁇ particle emitting agent covering the outer surface of the network member. According to this feature, the air in the introduction pipe passes through the mesh of the mesh member, so that the ⁇ particles are surely attached to the air.
  • the supply means is characterized by having a nozzle that utilizes cavitation to generate the micro-nano bubbles. According to this feature, the nozzle can easily generate micro-nano bubbles.
  • a porous material containing at least aerobic microorganisms, containing carbon as a component, and having a micro-nano-level porous material is contained in the containing layer.
  • the biological treatment can be activated by the oxygen bubbles adsorbed on the oxygen molecule and the porous material. Therefore, using only a single storage tank, it is possible to carry out biological treatment using aerobic microorganisms in addition to sterilization treatment with ozone and denitrification treatment with ⁇ particles.
  • the porous material is characterized in that it is formed to have a smaller diameter than the micro-nano bubbles.
  • ozone bubbles chemically change into oxygen molecules by adhering to the outer surface around the pores of the porous material without entering the porous pores of the porous material. Therefore, the aerobic microorganisms in the pores come into contact with oxygen molecules without being in contact with ozone molecules, that is, they obtain abundant oxygen without being killed and function actively.
  • the porous material is characterized by being made of activated carbon. According to this feature, activated carbon can positively decompose residual ozone into oxygen effective for biological treatment. Further, due to the far-infrared effect of activated carbon, the activation of microorganisms can be maintained even under adverse conditions such as a water temperature of 10 ° C. or lower.
  • the porous material is characterized in that it is supported on a carrier.
  • the carrier can be used as a reaction site for ozonolysis and biological treatment.
  • micro-nano bubbles consisting of small-diameter bubbles reduce water resistance and increase permeability, making it easier for water to penetrate into the inside of the carrier, thus stimulating facultative anaerobic microorganisms inside.
  • facultative anaerobic microorganisms To activate.
  • both aerobic microorganisms and facultative anaerobic microorganisms are activated, and the food chain (including cannibalism between microorganisms) is promoted, so that early and advanced biological treatment can be performed without generating excess sludge. Can be achieved.
  • the carrier is characterized in that it is configured to be capable of carrying an enzyme. According to this feature, by carrying an enzyme that activates the activity of aerobic microorganisms, the action of the enzyme promotes the reproduction of aerobic microorganisms.
  • the upper part of the storage tank is provided with an introduction part for introducing the water to be treated
  • the lower part of the storage tank is provided with a discharge part for discharging the water to be treated in the storage tank.
  • a bubble discharge port for discharging the micro-nano bubbles is formed in the lower portion of the storage tank along the circumferential direction of the storage tank.
  • the ozone and oxygen micro-nano bubbles discharged at the bottom of the containment tank rise by their buoyancy while rotating along the inner peripheral wall together with the water to be treated and the porous material of the containment tank. Since it can generate a flow, the fluidity in the storage tank is increased, and at the same time, the hydroxyl radical effect due to the crushing action of micro-nano bubbles promotes the decomposition of suspended solids (SS), providing a device that hardly generates excess sludge. can do.
  • SS suspended solids
  • a water absorption port for absorbing the water to be treated in the storage tank is formed above the bubble discharge port of the storage tank. According to this feature, it is possible to increase the crushing efficiency of micro-nano bubbles by making it easier to suck in micro-nano bubbles from the water suction port.
  • the introduction portion is characterized in that it is provided in the vicinity of the inner peripheral wall of the storage tank. According to this feature, it is possible to efficiently mix the water to be treated introduced near the inner peripheral wall of the containment tank with the ozone and oxygen (air) micro-nano bubbles generated by the rotational ascending flow along the inner peripheral wall. can.
  • the supply means for supplying the micro-nano bubbles is characterized in that it utilizes cavitation. According to this feature, it can contribute to the decomposition of suspended solids (SS) in the water to be treated.
  • SS suspended solids
  • the wastewater treatment method of the present invention is characterized by having at least a bubble supply step of supplying micro-nano bubbles containing ozone, oxygen and ⁇ particles in a storage tank for accommodating water to be treated.
  • organic substances dissolved or suspended in the water to be treated are decomposed or sterilized by micro-nano bubbles of ozone in the storage tank, and the bubbles of residual ozone floating in the water to be treated are chemically converted into oxygen molecules.
  • residual ozone can be reduced, and at the same time, decomposition of organic substances can be promoted together with oxygen contained in micro-nano bubbles.
  • the micro-nano bubbles containing the ⁇ particles float in the water to be treated, the ⁇ particles act on a wide range without being attenuated, and the denitrification effect can be enhanced.
  • the bubble supply step it is characterized in that micro-nano bubbles of an air-fuel mixture obtained by mixing the ozone and the air to which the ⁇ particles are given are generated. According to this feature, an air-fuel mixture can be easily generated by giving ⁇ particles to air containing oxygen and mixing ozone.
  • the biological treatment can be activated by the oxygen bubbles adsorbed on the oxygen molecule and the porous material. Therefore, in addition to the sterilization treatment with ozone and the denitrification treatment with ⁇ particles, biological treatment using aerobic microorganisms can be performed.
  • the porous material is characterized in that it is formed to have a smaller diameter than the micro-nano bubbles.
  • ozone molecules are chemically changed to oxygen molecules by contacting the outer surface around the pores of the porous material without the ozone bubbles entering the inside of the porous material. Therefore, the aerobic microorganisms in the pores come into contact with oxygen molecules without being in contact with ozone molecules, that is, they obtain abundant oxygen without being killed and function actively.
  • the porous material is characterized by being made of activated carbon. According to this feature, activated carbon can positively decompose residual ozone into oxygen effective for biological treatment. Further, due to the far-infrared effect of activated carbon, the activation of microorganisms can be maintained even under adverse conditions such as a water temperature of 10 ° C. or lower.
  • FIG. It is a top view which shows the wastewater treatment apparatus in Example 1.
  • FIG. It is a vertical sectional view which shows the processing tank. It is a vertical sectional view which shows the microbubble generation nozzle of ozone, ⁇ particle and oxygen.
  • (A) is a front view showing a network member
  • (b) is a view showing a situation in which the network member is wound
  • (c) is a sectional view taken along the line AA of FIG.
  • A) is an enlarged view of a portion B in FIG. 3
  • (b) is an enlarged view of a portion C in FIG. It is a figure explaining the structure of a fungus bed and a carrier.
  • FIG. 1 is a front view showing a network member
  • (b) is a view showing a situation in which the network member is wound
  • (c) is a sectional view taken along the line AA of FIG.
  • (A) is an enlarged
  • FIG. 1 is a wastewater treatment apparatus to which the present invention is applied.
  • the wastewater treatment device 1 is a device installed in a food factory and purifies sewage containing organic substances such as oils and fats discarded from the factory as treated water before being discharged into a river or the like. There is no other wastewater treatment device 1 that can be discharged directly to rivers, waterways, sea areas, etc. without providing a settling tank or membrane treatment means.
  • the wastewater treatment device 1 is connected to a raw water tank 4 that collects sewage discharged from the inside of the factory 2 to the outside of the factory 2 on the upstream side thereof.
  • the wastewater treatment apparatus according to the present invention is not limited to the food factory of the present embodiment, and includes general wastewater such as domestic wastewater of apartment houses such as condominiums, and organic wastewater such as business complex buildings and chemical factories. It can be widely applied to hospitals, hotels, restaurants, etc., or it can be operated in sewage treatment plants.
  • a drainage pipe 39 for discharging treated sewage is connected to the downstream side thereof, and the purified wastewater is discharged to a river or the like (not shown) through the drainage pipe 39.
  • the wastewater treatment device 1 of the first embodiment includes a treatment tank 30 for performing treatment by micro-nano bubbles and biological treatment as a storage tank into which the water to be treated is introduced, and ozone, oxygen (air) and ⁇ particles described later. It mainly includes a bubble generator 40 as a supply means for supplying micro-nano bubbles.
  • the raw water tank 4 is a water tank having a substantially rectangular shape in a plan view in which wastewater collected from the factory 2 is introduced through the wastewater groove 3, and the raw water tank 4 is connected to the next treatment tank 30.
  • a raw water pump 5 for transfer and a float 6 as a water level sensor are installed (see FIG. 7).
  • the internal capacity of the raw water tank 4 is approximately 2 tons, but in practice, the storage amount is less than 1 ton and is transferred to the next treatment tank 30 by float control.
  • the treatment tank 30 is a substantially cylindrical water tank in which the water to be treated from the raw water tank 4 is introduced via a transfer pipe 7 connected to the transfer pump 5, and ozone and oxygen (air) are contained in the treatment tank 30.
  • a bubble discharge port 30c that discharges micro-nano bubbles containing ⁇ particles (hereinafter, may be referred to as micro-nano bubbles or simply bubbles), a discharge port 30d that communicates openly and closably with a drain pipe 39 via an on-off valve 38, and a water level.
  • a float 36 as a sensor is installed. This discharge method may be an overflow via a pipe from the lower part to the upper part without attaching the on-off valve 38.
  • the internal capacity of the processing tank 30 is approximately 54 tons, and the height in the vertical direction is longer than the inner diameter in the plane direction.
  • sterilization treatment with ozone hereinafter, also referred to as ozone treatment. It is possible to promote denitrification treatment with ⁇ particles, biological treatment with aerobic microorganisms, and chemical changes that reduce residual ozone after ozone treatment.
  • the bubble discharge port 30c communicates with the processing tank 30 and is connected to a bubble generator 40 installed outside the processing tank 30.
  • a large number of bacterial beds 50, 50, ... Are charged inside the treatment tank 30, and these bacterial beds 50, 50, ... Are aerobic microorganisms and facultative anaerobes. It has come to be used as a fungal bed for sex microorganisms.
  • the fungal beds 50, 50, ... Form a substantially rectangular parallelepiped carrier 51, 51, ... With a long side and a short side, and can freely move inside the treatment tank 30.
  • the fungus bed 50 is formed of a synthetic resin made from a mineral substance having a plurality of pores. Further, not only aerobic microorganisms and facultative anaerobic microorganisms but also activated carbon 58 produced in powder form is added to the bacterial beds 50, 50, ... (See FIG. 6). Not limited to this, a neutralizing agent, an odor suppressing agent, or the like can be added.
  • an introduction port 17a opened at the tip of the transfer pipe 17 described above is provided in the upper part of the treatment tank 30, and a discharge port 30d communicating with the drain pipe 39 via the opening / closing valve 38 is the lower part of the treatment tank 30. Since it is provided near the bottom surface of the water, the water to be treated introduced into the treatment tank 30 descends from the introduction port 17a of the transfer pipe 17 while being biologically treated. According to this, since the water to be treated introduced from the upper part of the treatment tank 30 flows to the lower part of the treatment tank 30, it is possible to take a long time for biological treatment in the treatment tank 30.
  • the drainage pipe 39 is once raised to the water level of the treatment tank 30, and the same amount of water as the amount of water flowing in from the introduction port 17a is discharged as it is under natural flow.
  • the bubble discharge port 30c is open in the circumferential direction of the inner peripheral wall 30a of the processing tank 30, when micro-nano bubbles are discharged from the bubble discharge port 30c, a circulating flow is generated in the cylindrical processing tank 30.
  • micro-nano bubbles By adhering micro-nano bubbles to the bacterial beds 50, 50, ..., they are moved upward by the circulating flow while increasing buoyancy, and are dropped again as the micro-nano bubbles collapse or detach over time, so that biological treatment is performed. Can be done effectively.
  • a stirring plate or the like for stirring the fungal beds 50, 50, ... may be provided on the inner peripheral surface of the processing tank 30, whereby the inside of the processing tank 30 is rotationally driven. Then, the fungal beds 50, 50, ... Are moved upward by the above-mentioned stirring plate and dropped downward again, so that biological treatment can be effectively performed.
  • the bubble generator 40 is connected to a connection pipe 48 communicating with a water suction port 30b opened near the bottom surface of the lower part of the treatment tank 30, a water absorption pump 47 for absorbing liquid, a micro-nano bubble generation nozzle 45 (nozzle), and the same. It is mainly composed of an ozone generator 49 connected to a micro-nano bubble generating nozzle 45.
  • the water absorption pump 47 is adapted to absorb the liquid inside the treatment tank 30 through the water suction port 30b of the treatment tank 30.
  • the micro-nano bubble generation nozzle 45 is attached to the downstream side of the connection pipe 48 extending from the water absorption pump 47, and the liquid absorbed by the water absorption pump 47 is supplied to the micro-nano bubble generation nozzle 45 and blown out. ing.
  • the micro-nano bubble generation nozzle 45 belongs to the shear type that self-absorbs ozone and air, and is characterized in that it uses cavitation.
  • the pressure melting method can also be applied. Any model of the micro-nano bubble generation nozzle 45 may be used, but it is necessary that the nozzle 45 does not cause clogging even if a solid substance flows in.
  • the micro-nano bubble generation nozzle 45 compresses a supply unit 21 connected to a connection pipe 48 of a water absorption pump 47 to supply a liquid and a liquid supplied from the supply unit 21. It is a nozzle member having a substantially cylindrical shape (straight pipe shape) having a compression portion 22 (passing portion) through which the liquid passes through the compression portion 22 and a blowout portion 23 through which the liquid passing through the compression portion 22 is blown out.
  • the inner diameter of the supply section 21 which is the inlet of the liquid is substantially parallel to the compression section 22, and the inner diameter of the blowout section 23 is expanded from the compression section 22. That is, the inner diameter of the compression unit 22 is the minimum, and the flow rate of the liquid supplied from the supply unit 21 increases as it passes through the compression unit 22, so that the flow rate of the sewage becomes high due to the Venturi effect and the flow rate of the sewage becomes high. It is blown out from 23.
  • the ozone taken in through the ozone bubble is ejected into the compression unit 22 through the branch pipe 24 branched into a plurality of branches in the micro-nano bubble generation nozzle 45.
  • the oxygen-containing air taken into the micro-nano bubble generation nozzle 45 from the atmosphere through the tubular introduction pipe 61 and the main portion 46a of the air supply pipe 46 merges with the above-mentioned ozone and has a plurality of branched branch pipes. It is designed to be ejected into the compression unit 22 through 24.
  • An on-off valve 62 is interposed between the introduction pipe 61 and the main portion 46a of the air supply pipe 46, and in this embodiment, the internal valve body 62b is arbitrarily opened by the manual operation portion 62a. It has been adjusted so that the air flow rate can be controlled. In this way, the ozone bubbles and oxygen (air) bubbles ejected from the branch pipe 24 into the compression section 22 become ultrafine bubbles and are mixed with the liquid in the compression section 22. At this time, cavitation also occurs at the same time, which also contributes to the decomposition of suspended solids (SS).
  • SS suspended solids
  • these ultrafine bubbles are ejected as micro-nano bubbles of ozone and oxygen (air), that is, bubbles having a diameter of nano-level, from the ejection portion 23 into the processing tank 30 through the bubble discharge port 30c.
  • the micro-nano bubble generation nozzle 45 is arranged in a connecting pipe 48 communicating with the inside of the processing tank 30, and blows out a liquid containing micro-nano bubbles into water through the bubble discharge port 30c.
  • the introduction pipe 61 connected to the upstream side of the air supply pipe 46 is formed in a cylindrical shape in which both ends communicate with each other.
  • the nominal diameter d of the introduction pipe 61 is approximately 3 cm in this embodiment, but is not limited to this, and it is preferable that the introduction pipe 61 is designed in the range of approximately 1 cm to 5 cm.
  • the extension L of the introduction pipe 61 is approximately 15 cm in this embodiment, but is not limited to this, and it is preferable that the extension L is designed in the range of approximately 10 cm to 20 cm.
  • a predetermined number (two in this embodiment) of mesh members 65 as the ⁇ -radioactive source portion wound as described later are installed inside the introduction pipe 61.
  • a coating agent 66 containing a radioactive substance that emits ⁇ rays to the outside is coated on substantially the entire surface of the network member 65.
  • the mesh member 65 is made of a wire mesh having relatively soft elasticity, and is a member having a mesh 65a having a large number of fine holes (1 cm or less), and in its natural state, it has a horizontally long rectangular flat surface shape. be. As shown in FIG.
  • the net-like member 65 is wound around an axis around a core material 64 provided on one side of the short side thereof, and is inside the introduction pipe 61 as shown in FIG. It was inserted.
  • the net-like member 65 does not have to be provided with a core material 64 in particular.
  • the bubble generator 40 includes an introduction pipe 61 having an opening for introducing air, an ozone generating portion communicating with the introduction pipe 61, and a network member 65 coated with a coating agent 66 as an ⁇ ray source portion.
  • ⁇ particles are given to the oxygen-containing air introduced into the introduction pipe 61, and ozone is mixed, so that an air-fuel mixture can be easily generated.
  • the net-like member 65 is provided inside the introduction pipe 61, ⁇ particles can be stably supplied only by circulating air in the introduction pipe 61.
  • the net-like member 65 has an inner peripheral surface of the introduction pipe 61 due to a force acting in the outer diameter direction to elastically restore the original flat surface shape inside the introduction pipe 61. It is in close contact with each other over almost the entire circumference of 61a. That is, the net-like member 65 is formed in a substantially spiral shape around the core material 64 in the pipe axial direction of the introduction pipe 61, and the air (outside air) flowing into the inside of the introduction pipe 61 is in contact with the surface of the net-like member 65. , It flows out to the downstream side in the pipe axis direction while passing through a large number of meshes 65a many times.
  • the coating agent 66 as an ⁇ ray source is applied to substantially the entire surface of the network member 65, ⁇ rays are emitted outward from the entire surface of the network member 65 in all directions. .. Therefore, the air (outside air) flowing into the inside of the introduction pipe 61 is emitted from the entire surface of the mesh member 65 while in contact with or close to the surface of the mesh member 65 or when passing through the mesh 65a.
  • the particles 66a) are sufficiently received and flow out from the introduction pipe 61 together with the ⁇ particles 66a.
  • the ⁇ -ray source portion of the present invention is composed of a network member 65 on which a large number of meshes 65a are formed and a coating agent 66 as an ⁇ particle emitting agent covering the outer surface thereof, thereby forming the inside of the introduction tube 61.
  • the ⁇ -rays are emitted linearly in the normal direction starting from substantially the entire surface of the portion constituting each mesh 65a of the mesh-like member 65, that is, inside the introduction tube 61, the ⁇ -rays are emitted.
  • ⁇ rays will be emitted in the axial direction, the pipe radial direction, and any linear direction inclined with respect to them.
  • the penetrating power of ⁇ rays is so weak that they are shielded by a single sheet of paper, and the range of ⁇ rays in the air is generally several cm (about 3 cm to 8 cm), as in this embodiment. Since the ⁇ rays emitted to the air passing through the introduction pipe 61 having an inner diameter d of about 3 cm (hereinafter referred to as “passing air”) are within the range of the range, they are not attenuated. Can reach the passing air.
  • the range of the ⁇ particle 66a itself is several. Even if it is cm, it is possible to move in the water to be treated by being contained in micro-nano bubbles at a distance of several meters to the bubble discharge port 30c with the passing air.
  • the coating agent 66 of this embodiment is a liquid agent obtained by diluting thorium dioxide (ThO 2 ) with an inert solvent as a compound of thorium (Thor232), which is a radioactive element that emits weak ⁇ rays, and is used on the network member 65. On the other hand, it was applied in an amount of 5% or less by weight without any other legal restrictions.
  • Thorium (Thor232) is a naturally occurring metal known as a radioactive element having an extremely long half-life of 14 billion years, that is, it emits alpha rays semipermanently. Not limited to this, any material that can emit ⁇ rays and is used in a legal amount may be used.
  • the air (outside air) that has passed through the introduction pipe 61 is mixed with ozone supplied through the air supply pipe 41 through the air supply pipe 46 on the downstream side with the ⁇ particles 66a, and then will be described later. It is designed to be blown out as micro-nano bubbles in the water to be treated.
  • the range of alpha rays in water is generally about 1/1000 of the range in air, which is very short, several tens of ⁇ m, but ozone and air (outside air) that make up micro-nanobubbles. Since the ⁇ particles 66a contained in the air-fuel mixture with and can move freely in the water to be treated and over a long distance without being attenuated in the state of being contained in the air-fuel mixture, they are dispersed in the waste water which is the water to be treated.
  • ⁇ particles a significant decrease in total nitrogen (TN) in the water to be treated was confirmed, as shown by the experiments described later.
  • TN total nitrogen
  • ⁇ particles by giving ⁇ particles to a nitrogen compound containing nitrogen atoms contained in the water to be treated, in addition to the action of releasing protons from nitrogen nuclei confirmed by so-called Rutherford experiments, enrichment of nutrients It is considered that some nitrogen compounds that cause the above are chemically changed and released into the outside air as nitrogen molecules.
  • a bubble generator 40 that generates micro-nano bubbles by mixing ozone, oxygen (air), and ⁇ particles is provided, but the present invention is not limited to this, and for example, as in Example 2 described later.
  • a bubble generator that generates micro-nano bubbles of ozone and a bubble generator that generates micro-nano bubbles of oxygen (air) and ⁇ particles may be separately provided. Further, it may be used in combination with a conventional air diffuser (air diffuser, diffuser, etc.).
  • the procedure for treating sewage by the treatment device 1 of the above embodiment will be described with reference to FIGS. 1 to 3.
  • the float 6 detects a predetermined water level, and the raw water pump 5 operates to operate the raw water tank.
  • the water to be treated in 4 is transferred to the treatment tank 30. That is, the water to be treated in the raw water tank 4 is intermittently transferred to the treatment tank 30.
  • ozone treatment with micro-nano-bubbled ozone and denitrification treatment with ⁇ particles contained in the bubbles are performed by the bubble supply step. More specifically, ozone (O3) , which has a strong oxidizing power, is bubbled into micro-nano-level microdiameters to generate a large amount of OH groups (OH- ) and organic substances contained in the water to be treated. Physically decompose. In this way, since the organic matter is physically decomposed by ozone (O3) , predation by microorganisms described later becomes easy.
  • ozone (O 3 ) in the treatment tank 30 chemically changes to oxygen (O 2 ) by causing an oxidizing action as described above, but the rest still remains as ozone micro-nano bubbles. (Hereinafter referred to as residual ozone).
  • ⁇ particles contained in micro-nano bubbles moving in the water to be treated act on the nitrogen nuclei of the nitrogen compound in the water to be treated so as to exert a high denitrification effect on the water to be treated. It has become.
  • the water to be treated in the treatment tank 30 is stirred and mixed with the biological treatment step, that is, the bacterial beds 50, 50, ... Carrying aerobic microorganisms in the treatment tank 30.
  • the biological treatment step that is, the bacterial beds 50, 50, ... Carrying aerobic microorganisms in the treatment tank 30.
  • Biologically treated More specifically, the liquid containing the ozone / oxygen (air) micro-nano bubbles generated by the ozone / oxygen (air) bubble generator 40 is provided in the bubble discharge port 30c near the bottom surface of the lower part of the treatment tank 30. It is designed to be discharged into the processing tank 30.
  • the bubble discharge port 30c is open in a direction along the circumferential direction of the inner peripheral wall 30a of the substantially cylindrical treatment tank 30, and the bubble discharge port 30c is provided together with the water to be treated that has been absorbed by the water absorption pump 47 from the water absorption port 30b. Because the ozone / oxygen (air) micro-nano bubbles discharged from the surface can generate a rotating ascending current that rises while rotating along the inner peripheral wall 30a together with the water to be treated and the carrier 51 of the processing tank 30 due to its buoyancy.
  • the water absorption port 30b is opened at a position higher than the bubble discharge port 30c, it is easy to suck in the micro-nano bubbles discharged from the bubble discharge port 30c, and the crushing efficiency of the micro-nano bubbles can be improved.
  • the ⁇ particles contained in the bubbles act on the nitrogen compound containing nitrogen atoms in the water to be treated to obtain a denitrification effect.
  • the introduction port 17a of the transfer pipe 17 for transferring the water to be treated from the raw water tank 4 to the treatment tank 30 is provided in the upper part of the treatment tank 30, and the discharge port 30d for discharging the biologically treated water is provided. Since it is provided in the lower part of the treatment tank 30, the water to be treated in the treatment tank 30 is in the process of flowing from the introduction port 17a located in the upper part of the treatment tank 30 to the discharge port 30d located in the lower part. It can be reliably treated with ozone, denitrification and biological treatment.
  • the introduction port 17a is open in the vicinity of the inner peripheral wall 30a at the upper part of the treatment tank 30, the water to be treated that has just been discharged from the introduction port 17a and transferred to the treatment tank 30 immediately follows the above-mentioned downward flow.
  • the mixture can be efficiently mixed.
  • each of the bubbles generated by the bubble generator 40 contains ⁇ particles together with ozone and oxygen (air).
  • the range of the ⁇ particle itself is as short as several tens of cm, but since the bubble itself travels a long distance in water, the ⁇ particle does not move in the air (inside the bubble). That is, it can move in water over a long distance with the bubbles without being attenuated. Further, the ⁇ particles come into contact with the water to be treated together with the crushing of bubbles after traveling a long distance. Therefore, the ⁇ particles can efficiently come into contact with the nitrogen component contained in the water to be treated, and as a result, a high denitrification effect can be obtained.
  • the liquid staying in the treatment tank 30 contains microbubbles at the same time. , A large amount of oxygen is dissolved, and sufficient oxygen will continue to be supplied to the water to be treated and the bacterial beds 50, 50, ... In the treatment tank 30.
  • the bubble generator 40 can generate bubbles having a diameter of 50 ⁇ m or less, more oxygen can be dissolved in the liquid as compared with normal bubbling, and the water to be treated and bacteria in the treatment tank 30 can be dissolved. Sufficient oxygen will continue to be supplied to the floors 50, 50, .... Since the liquid permeates the treated water and the bacterial bed 50, 50, ... With bubbles staying, the treated water and the bacterial bed 50, 50, ... Are difficult to reach only by contacting with air by stirring with a circulating flow. Air can be effectively supplied to the aerobic microorganisms existing inside the mass, and the aerobic microorganisms can be activated to exert a high aerobic decomposition ability.
  • the outside air air
  • this air can be allowed to stay in the sewage for a long time and is mixed by the bubble generator 40.
  • the air dissolved oxygen
  • the air can be retained in the sewage to make the inside of the drain pipe 39 leading to the river, waterway, sea area, sewage treatment facility, etc. aerobic, and the effect of reducing the frequency of cleaning the inside of the drain pipe 39 can be achieved. Can be expected.
  • the treatment tank 30 containing the carrier 51 carrying the aerobic microorganism against the treated water and the residual ozone sterilized by ozone in the bubble supply step is used in the biological treatment step.
  • the biological treatment of the water to be treated by the aerobic microorganisms activated by this oxygen is effectively performed, and the oxygen added to the residual ozone positively chemicals the hydroxyl radicals and oxygen.
  • this residual ozone can be reduced at an early stage.
  • the suspended solids (SS) are decomposed by the cavitation effect of the hydroxyl radicals generated in a large amount and the micro-nano bubble generation nozzle 45, the generation of excess sludge is extremely reduced.
  • the micro-nano bubbles containing the ⁇ particles float in the water to be treated, the ⁇ particles themselves do not move, so that the ⁇ particles act in a wide range without being attenuated, and the denitrification effect can be enhanced.
  • the experimental results regarding the amount of airflow passing through the inside of the introduction pipe 61 loaded with the mesh member 65 are shown below.
  • a predetermined number of mesh members 65 are loaded inside the introduction pipe 61, and the flow rate of air passing through the introduction pipe 61 (2.5 L / min to 10 L / min) is used as a parameter for each air volume. This is a comparison of the purification effects of the water to be treated.
  • an aqueous solution of degreased powdered milk having a constant concentration is used as artificial sewage (raw water), and the reticulated member is used at each aeration rate (2.5 L / min, 5 L / min, 7.5 L / min and 10 L / min).
  • Microbubbles of a mixture of air ventilated in the introduction pipe 61 loaded with 65 and ozone at a constant flow rate (5 L / min) were blown into the treated water, and the water quality of each treated water was analyzed and compared. ..
  • the analysis items are biochemical oxygen demand BOD, chemical oxygen demand COD, pH, total nitrogen TN and total phosphorus TP.
  • the case of the aeration rate of 2.5 L / min is compared with the case of other aeration rates (5 L / min, 7.5 L / min and 10 L / min), and biochemical oxygen demand.
  • a significant decrease in the required amount BOD and total nitrogen TN was confirmed.
  • total nitrogen TN decreased by 20% to 42 (mg / L) as compared with 50 (mg / L) of raw water. No significant difference was confirmed in other analysis items due to the difference in air volume.
  • the air volume in the introduction pipe 61 is 2.5 L / min, the biochemical oxygen demand BOD and the total nitrogen TN are reduced most, that is, the best effect of improving the water quality is obtained. It is considered that this is because the air passes through the introduction pipe 61 at a low speed so that the air comes into contact with more ⁇ particles.
  • the experimental results regarding the loading number of the network member 65 (referred to as a catalyst in the figure) to be loaded inside the introduction pipe 61 are shown below.
  • the fixed condition was 2.5 L / min, which was evaluated as the optimum air volume in the above-mentioned experiment on the air volume in the introduction pipe 61, and the number of loaded mesh members 65 in the introduction pipe 61 (1 piece). ⁇ 4) as a parameter, and the purification effect of the water to be treated at each loading number is compared.
  • the mesh member 65 is arranged substantially in the center of the introduction pipe 61 when one mesh member 65 is loaded, and the introduction pipe is loaded when two mesh members 65 are loaded.
  • the air ventilated in the introduction pipe 61 loaded with the mesh member 65 of each loading number (1 to 4), and Microbubbles of a mixture with ozone at a constant flow rate (5 L / min) were blown into the water to be treated, and the water quality of each water to be treated was analyzed and compared.
  • the analysis items are biochemical oxygen demand BOD, chemical oxygen demand COD, pH, total nitrogen TN and total phosphorus TP.
  • the decrease in total nitrogen TN is the largest, that is, the best effect of improving the water quality is obtained. It is considered that this is because the plurality of net-like members 65 are arranged in the introduction pipe 61 at a certain distance or more, so that the ⁇ particles can be supplied without impairing the air permeability in the introduction pipe.
  • sewage obtained by diluting industrial wastewater 7 times was used, and the inside of the introduction pipe 61 loaded with two mesh members 65 (referred to as a catalyst in the figure) was ventilated at a flow rate of 2.5 L / min.
  • Microbubbles of a mixture of air containing ⁇ particles and ozone at a constant flow rate (5 L / min) were blown into the water to be treated, and the water quality of each water to be treated was analyzed.
  • the analysis items are biochemical oxygen demand BOD, chemical oxygen demand COD, pH, suspended solids amount SS, normal hexane extraction amount n-Hex and total nitrogen TN.
  • the micro-nano bubbles containing ⁇ particles were significantly superior in at least the denitrification effect as compared with the micro-nano bubbles not containing ⁇ particles.
  • the ⁇ particles contained in the micro-nano bubbles can move a long distance in the water to be treated by following the micro-nano bubbles without moving in the air, that is, they can move a long distance without being attenuated. It has many opportunities to come into contact with nitrogen compounds in the water to be treated, and has a high denitrification effect.
  • the bubbles containing ⁇ particles are a large number of micro-nano bubbles having a particle size less than the micro level, these bubbles can come into contact with the contents of the water to be treated on a larger surface area, and have an oxygen supply effect. Water purification by denitrification effect can be achieved to a high degree.
  • the fungus bed 50 means a carrier 51 inoculated with aerobic microorganisms and facultative anaerobic microorganisms, and the carrier 51 means a state in which microorganisms are not inoculated.
  • the synthetic resin made from the mineral substance constituting the carrier 51 excludes natural resins such as plant resins and means those which are not decomposed by aerobic microorganisms.
  • the fungus bed 50 has a carrier 51 made of a synthetic resin made of a mineral substance having a plurality of pores 52 as a raw material, and aerobic microorganisms and facultative anaerobic substances in at least a part of the plurality of pores formed in the carrier 51. It can carry a predetermined amount of an enzyme that activates the activity of aerobic microorganisms and an aerobic microorganism, and contains activated charcoal 58 produced in the form of a powder having a small diameter.
  • FIG. 6 is a diagram showing the structures of the fungus bed 50 and the carrier 51. Pore 52 is formed in the carrier 51 made of a synthetic resin made of a mineral substance as a raw material.
  • the vacancies 52 include those in which at least a part thereof communicates with other vacancies and those in which the vacancies 52 do not communicate with other vacancies.
  • the pores 52 have a size of about 50 ⁇ m to about 800 ⁇ m, and pores 52 of various sizes are substantially uniformly dispersed in the carrier 51. Further, the pores 52 can carry the enzyme 53 and contain powdered activated carbon 58, and the pores 52 serve as nests for aerobic microorganisms and facultative anaerobic microorganisms (not shown).
  • the large pores 52 are not filled with dispersible enzymes, and as will be described later, sewage and air enter and leave the pores 52 due to the stirring action, providing an environment suitable for the growth of aerobic microorganisms. .. Further, since the small pores 52 are in a state where the pores are filled with the enzyme, sewage and air hardly enter and exit, but the enzyme gradually exudes and functions as a source of the enzyme for a long period of time.
  • the pores 52 can carry a spreadable enzyme that activates the activity of aerobic microorganisms, the action of the enzyme promotes the growth of aerobic microorganisms.
  • the enzyme carried on the carrier uses multiple enzymes to prevent the growth of aerobic microorganisms from being affected even if the installation environment and operating conditions of the sewage treatment device change. It is designed to be able to breed. In this embodiment, the above-mentioned enzyme is supported on the pores 52, but it is not always necessary to support the enzyme on the carrier 51.
  • a certain amount of facultative anaerobic microorganisms are present inside the carrier 51, particularly in the pores 52 in the central part.
  • This permeable anaerobic microorganism is hardly activated in normal aerated water because the water to be treated cannot penetrate into the inside of the carrier 51, but in the case of micro-nano bubbles composed of bubbles having a small diameter, the resistance of water is reduced.
  • the permeability is increased, water easily penetrates into the inside of the carrier 51, oxygen is adsorbed by the aerobic microorganisms on the surface layer, and then the permeable anaerobic microorganisms existing inside are stimulated by the micro-nano bubble water and activated. do.
  • both aerobic microorganisms and facultative anaerobic microorganisms are activated, and the food chain (including cannibalism between microorganisms) is promoted, so that early and advanced biological treatment can be performed without generating excess sludge. Can be achieved.
  • the fungal bed 50 is composed of a synthetic resin made from a mineral substance, it is not decomposed by microorganisms, and the carrier 51 and the plurality of pores on which the microorganisms are supported are stably supported. It will be possible to secure it. Further, by the action of the activated charcoal and / or the enzyme carried in the pores of the carrier, not only the growth rate of aerobic microorganisms can be increased, but also aerobic microorganisms and facultative anaerobic microorganisms can be sufficiently propagated. It can also suppress bad odors. In addition, since aerobic microorganisms and facultative anaerobic microorganisms are supported in the pores, they do not flow out due to impact or watering due to circulating flow.
  • the ozone can effectively decompose and treat the floating organic substances contained in the water to be treated in the treatment tank 30.
  • minute ozone bubbles having a nano-level diameter are supplied near the bottom of the treatment tank 30 to decompose and treat the surrounding organic matter, and further decompose and treat the organic matter gradually while floating in the water to be treated, and then the water surface.
  • the carrier 51 which also drifts together with the water to be treated, becomes a place for collecting residual ozone bubbles and oxygen (air) bubbles, that is, the residual ozone bubbles are adsorbed on the pores 52 of the carrier 51, so that ozone molecules are adsorbed to each other. Is promoted to become an oxygen molecule.
  • the carrier 51 which also drifts together with the water to be treated, becomes a place for collecting residual ozone bubbles and oxygen (air) bubbles, that is, the residual ozone bubbles are adsorbed on the pores 52 of the carrier 51, so that ozone molecules are adsorbed to each other. Is promoted to become an oxygen molecule.
  • the activated carbon 58 is contained in and around the pores 52 of the carrier 51, the activated carbon 58 is positively contained in the porous 58a (pores) of the activated carbon 58.
  • the ozone molecule O3 can be collected in the oven and easily decomposed , that is, chemically changed into the oxygen molecule O2 .
  • the porous 58a of the activated carbon 58 is formed in nano-level pores of about 2 nm to 50 nm, and many aerobic microorganisms exist inside the porous 58a as a habitat.
  • the ozone bubble is approximately 50 nm to 200 nm, that is, the porous 58a of the activated carbon 58 has a smaller diameter than the ozone bubble, so that the ozone bubble does not enter the inside of the porous 58a and the activated carbon 58 is used.
  • the ozone molecule O3 is chemically changed to the oxygen molecule O2 . Therefore, the aerobic microorganisms in the porous 58a come into contact with the oxygen molecule O2 without being in contact with the ozone molecule O3 , that is, obtain abundant oxygen without dying and function actively.
  • the carrier 51 in the treatment tank 30 serves as a place for collecting residual ozone and oxygen bubbles in the pores 52, thereby achieving reduction / elimination of residual ozone and at the same time changing residual ozone into oxygen bubbles.
  • the activation of aerobic microorganisms carried by the carrier 51 can be achieved by the abundant oxygen effective for biological treatment with the added oxygen molecule.
  • At least the epidermis portion of the carrier 51 is made of an elastic body having abundant shape-restoring force.
  • At least the outer skin part of the carrier from an elastic body having abundant shape-restoring force, at least the epidermis part of the fungus bed collides with each other and comes into contact with each other during the stirring process between the water to be treated and the fungus bed in the treatment tank.
  • the absorption and exhaustion of water and air from the pores of the fungus bed is promoted, and the air and water necessary for the growth of aerobic microorganisms can be sufficiently supplied into the pores of the fungus bed.
  • the fungus bed 50 may be exposed to water and at the same time, the temperature may reach close to 60 ° C due to the activity of microorganisms.
  • aerobic microorganisms usually become active in neutral or weakly acidic environments.
  • the pH may decrease in the process of decomposing organic matter, and the activity of aerobic microorganisms may be inhibited.
  • caustic soda, lime, calcium carbonate and the like may be added into the treatment tank 30 in an appropriate amount to adjust the pH, and the pH in the sewage treatment machine may change significantly.
  • urethane sponge is used as a material constituting the carrier 51.
  • the urethane sponge has excellent water absorption, drainage and water resistance, and does not deteriorate even in an acidic environment, an alkaline environment, or a high temperature environment, so that it is not necessary to replenish the carrier on a regular basis.
  • the urethane sponge constituting the carrier is characterized in that its density can be freely produced to some extent. Therefore, if the urethane sponge is manufactured so that the specific gravity is almost the same as that of the suspended solids (SS) in a state containing sewage, the bacterial bed does not become free from the suspended solids (SS) during stirring. Contact will accelerate the decomposition of suspended solids (SS).
  • the urethane sponge is an example, and any material having the same characteristics as the urethane sponge can be used.
  • the stirring action in the processing tank 30 of FIG. 2 will be described.
  • the fungal beds 50, 50, ... are moved upward by the rotary upflow, and the fungal bed 50 previously submerged in sewage is removed. , It will be compressed and restored by collision and contact between the fungal beds.
  • the absorption and exhaustion of water and air from the pores of the fungus bed is promoted, and oxygen and water necessary for the growth of aerobic microorganisms and facultative anaerobic microorganisms are transferred into the pores of the fungus bed. Will be able to supply enough.
  • the aerobic microorganisms and facultative anaerobic microorganisms carried on the fungus bed 50 are activated by the combination of the stirring action, the activated charcoal carried on the pores, and the action of the enzyme, and the water to be treated inside the treatment tank 30 is activated.
  • the organic content contained in the water is decomposed and the sewage is purified.
  • the shape of the carrier is not limited to the substantially rectangular parallelepiped in FIG. 6, but may be a substantially cube, a substantially sphere, a substantially cylinder, a tubular body, or a substantially regular octahedron, although not shown in particular. Further, by mixing and using the carriers 51 having different shapes, it is possible to keep the gap between the carriers large, and it is possible to further improve the water permeability and the air permeability in the sewage treatment tank.
  • the length of one side of the carrier 51 is set to about 5 mm to about 10 cm, but the capacity of each tank of the wastewater treatment device 1 and the water quality of the sewage to be treated (BOD, COD, SS, n-Hex) are taken into consideration. And its size can be determined.
  • the carrier is composed of a single synthetic resin made of the same mineral substance as a raw material, but at least the skin portion of the carrier is an elastic body having abundant shape-restoring force, and the other portions are different. It can also be composed of materials.
  • the outer skin of a cube is made of an elastic body with abundant shape-restoring force
  • the core part is made of a synthetic resin made from a mineral material having a different specific density from the skin
  • the average specific density of the carrier is sewage or sewage. It can also be adjusted to match the specific gravity of the solid content.
  • the core portion by forming the core portion with a carrier rich in enzyme and covering the epidermis portion with an elastic body having abundant shape-restoring force, it is possible to supply the enzyme to aerobic microorganisms for a long period of time. Further, it can be configured to expose a part of the core portion.
  • the treatment tank 30 (containment tank) organic substances floating in the water to be treated are sterilized by micro-nano bubbles of ozone, and bubbles of residual ozone floating in the water to be treated are formed into oxygen molecules.
  • O2 suspended substances
  • SS suspended substances
  • the oxygen molecule and the activated carbon 58 of the carrier 51 are also used.
  • Ozone bubbles adsorbed on the surface can activate biological treatment. That is, the carrier 51 can be used as a reaction site for ozone decomposition and biological treatment.
  • the micro-nano bubbles containing the ⁇ particles float in the water to be treated, the ⁇ particles act on the water to be treated in a wide range without being attenuated, and the denitrification effect can be enhanced. Therefore, using a single treatment tank 30, sterilization treatment with ozone, denitrification treatment with ⁇ particles, and biological treatment with aerobic microorganisms can be achieved at the same time.
  • the resistance of sewage is reduced by the micro-nano bubble effect, and not only aerobic microorganisms but also facultative anaerobic microorganisms existing inside the carrier 51 are activated by the permeation of micro-nano bubble water deoxidized by the aerobic microorganisms. And promotes the decomposition of organic substances.
  • the aerobic microorganisms are nitrified by utilizing oxygen (O 2 ), and the resistance is further reduced by the minute micro-nano bubbles, so that the facultative anaerobic microorganisms that have penetrated deep into the carrier 51 are denitrified. That is, this action also works effectively in nitrification denitrification.
  • the food chain (including cannibalism between microorganisms) in the carrier 51 is promoted, and early and advanced biological treatment can be achieved without generating excess sludge.
  • the facultative anaerobic microorganisms inside the carrier 51 have improved water permeability due to the micro-nano bubbles, so that the supply amount of micro-nano bubbles containing oxygen at least increases the frequency of contact with water, and oxygen is adsorbed by the aerobic microorganisms on the surface layer. After that, an oxygen-deficient liquid infiltrates, and as a result, the activity of facultative anaerobic microorganisms becomes active, which enables rational vitrification and denitrification, and enables miniaturization and energy saving of the bubble generator. ..
  • the wastewater treatment device 11 of the second embodiment has a reaction tank 10 for performing ozone treatment as a pretreatment tank, an ozone bubble generator 20, and ozone treatment and denitrification treatment as a storage tank.
  • a treatment tank 30 for performing biological treatment and an ozone / oxygen (air) and ⁇ -ray bubble generator 40 are mainly provided. That is, the wastewater treatment device 11 of the second embodiment is different from the wastewater treatment device 1 of the first embodiment in that the reaction tank 10 and the ozone bubble generator 20 are added, and the other configurations are the same as those of the wastewater treatment device 1. be.
  • the reaction tank 10 is a substantially cylindrical water tank in which the water to be treated from the raw water tank 4 is introduced via a transfer pipe 7 connected to the raw water pump 5, and an ozone bubble generator 20 is installed in the reaction tank 10.
  • a water absorption pump 27, a transfer pump 15 for transferring to the next processing tank 30, and a float 16 as a water level sensor are installed.
  • the internal capacity of the reaction tank 10 is approximately 2.7 tons, that is, the treatment tank 30 described above has an internal capacity approximately 20 times that of the reaction tank 10.
  • an ozone generator 29 constituting the ozone bubble generator 20 is installed outside the reaction tank 10 and is connected to the micro-nano bubble generator nozzle 25 via a connecting pipe 26.
  • the ozone bubble generator 20 is arranged on the bottom surface of the reaction tank 10 and is mainly composed of a water absorption pump 27 for absorbing liquid, a micro-nano bubble generation nozzle 25, and an ozone generator 29 provided outside the reaction tank 10. Has been done.
  • the water absorption pump 27 is adapted to absorb the liquid inside the reaction tank 10 from the water absorption unit 27a at the lower portion thereof.
  • the micro-nano bubble generation nozzle 25 is attached to the tip of a connection pipe 28 extending from the water absorption pump 27, and the liquid absorbed by the water absorption pump 27 is supplied to the micro-nano bubble generation nozzle 25. It is designed to be blown out.
  • Ozone generated by an ozone generator 29 installed outside the reaction tank 10 and taken in through an intake pipe 26 connected to the ozone generator 29 passes through a plurality of branched branch pipes 24 and enters the compression unit 22. It is supposed to be ejected to.
  • the bubbles ejected from the branch pipe 24 into the compression section 22 become ultrafine bubbles and are mixed with the liquid in the compression section 22. Then, these ultrafine bubbles are ejected from the ejection portion 23 into the reaction tank 10 as micro-nano bubbles of ozone.
  • the micro-nano bubble generation nozzle 25 is submerged under the surface of the liquid in the reaction tank 10 and blows out the liquid containing ozone micro-nano bubbles into the water.
  • the procedure for treating sewage by the treatment device 11 of the second embodiment will be described with reference to FIGS. 7 and 8.
  • the float 6 detects a predetermined water level, and the raw water pump 5 operates to operate the raw water tank.
  • the water to be treated in 4 is transferred to the reaction tank 10. That is, the water to be treated in the raw water tank 4 is intermittently transferred to the reaction tank 10.
  • an ozone supply step that is, ozone treatment with micro-nanobubble ozone is performed. More specifically, ozone (O3) , which has a strong oxidizing power, is bubbled into micro-nano-level microdiameters to generate a large amount of OH groups (OH-) and organic substances contained in the water to be treated. Physically decompose. In this way, since the organic matter is physically decomposed by ozone (O3) , it becomes easy for microorganisms to prey on the treatment tank 30.
  • the float 16 provided in the reaction tank 10 detects a predetermined water level, so that the transfer pump 15 operates and the reaction tank 10 operates as described above.
  • the ozone-treated water to be treated is transferred to the treatment tank 30 via the transfer pipe 17. That is, the water to be treated in the reaction tank 10 is intermittently transferred to the treatment tank 30.
  • Most of ozone (O 3 ) in the reaction vessel 10 chemically changes to oxygen (O 2 ) by causing an oxidizing action as described above, but the rest still remains as ozone micro-nano bubbles. This residual ozone is transferred to the treatment tank 30 together with the water to be treated.
  • the air containing oxygen and ⁇ particles taken into the micro-nano bubble generation nozzle 45 from the atmosphere through the introduction pipe 61 passes through the branch pipe 24 having a plurality of branches. It is designed to be ejected into the compression unit 22.
  • ozone treatment is performed in the reaction tank 10 as a pretreatment tank, but the treatment is not limited to this, and an appropriate chemical such as a coagulant is added to coagulate organic substances in the water to be treated.
  • -Pretreatment such as precipitation may be performed.
  • the bubbles of residual ozone contained in the water to be treated transferred from the reaction tank 10 to the treatment tank 30 are the circulating flow in the treatment tank 30 together with the bubbles containing the water to be treated, oxygen and ⁇ particles in the treatment tank 30.
  • the carrier 51 which also drifts together with the water to be treated, becomes a place for collecting residual ozone bubbles and oxygen (air) bubbles, that is, the residual ozone bubbles come into contact with the pores 52 of the carrier 51, so that ozone molecules are separated from each other. The chemical change that becomes an oxygen molecule is promoted.
  • the water to be treated is transferred and treated in the order of the raw water tank 4, the reaction tank 10, and the treatment tank 30, but for example, between the raw water tank 4 and the reaction tank 10, or the reaction tank.
  • a separate device may be added, such as interposing a solid-liquid separation device between the treatment tank 30 and the treatment tank 30.
  • Wastewater treatment equipment 2 Factory 4 Raw water tank 5 Raw water pump 7 Transfer pipe 10 Reaction tank 15 Transfer pump 17 Transfer pipe 17a Inlet port 20 Ozone bubble generator (ozone generator) 25 Micro-nano bubble generation nozzle 27 Water absorption pump 29 Ozone generator 30 Treatment tank (containment tank) 30c Bubble discharge port 30d Discharge port 39 Drain pipe 40 Bubble generator (supply means) 45 Micro-nano bubble generation nozzle 47 Water absorption pump 49 Ozone generator 50 Bacterial bed 51 Carrier 52 Pore 58 Activated carbon (porous material) 58a Porous 61 Introductory pipe 62 On-off valve 65 Net-like member ( ⁇ -ray source) 65a mesh 66 coating agent ( ⁇ ray source part, ⁇ particle emitting agent) 66a ⁇ particles

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  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Treatment Of Water By Oxidation Or Reduction (AREA)
  • Physical Water Treatments (AREA)

Abstract

L'invention concerne un appareil et un procédé de traitement des eaux usées qui permettent d'obtenir un effet adéquat d'élimination de l'azote dans les eaux usées traitées, ainsi qu'un effet de stérilisation, la matière organique dans les eaux usées traitées étant stérilisée par l'ozone.　Un appareil de traitement des eaux usées selon la présente invention est au moins constitué des éléments suivants : un réservoir de stockage 30 pour stocker les eaux usées à traiter ; et un moyen d'alimentation 40 pour fournir des microbulles et des nanobulles contenant de l'ozone, de l'oxygène et des particules α à l'intérieur du réservoir de stockage 30.
PCT/JP2020/037893 2020-10-06 2020-10-06 Appareil et procédé de traitement des eaux usées WO2022074740A1 (fr)

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