WO2021131088A1 - Appareil de traitement des eaux usées - Google Patents

Appareil de traitement des eaux usées Download PDF

Info

Publication number
WO2021131088A1
WO2021131088A1 PCT/JP2020/008721 JP2020008721W WO2021131088A1 WO 2021131088 A1 WO2021131088 A1 WO 2021131088A1 JP 2020008721 W JP2020008721 W JP 2020008721W WO 2021131088 A1 WO2021131088 A1 WO 2021131088A1
Authority
WO
WIPO (PCT)
Prior art keywords
carrier
tank
air diffuser
sludge
region
Prior art date
Application number
PCT/JP2020/008721
Other languages
English (en)
Japanese (ja)
Inventor
弘憲 角吉
浩成 飯野
Original Assignee
株式会社フジタ
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 株式会社フジタ filed Critical 株式会社フジタ
Priority to MX2022007293A priority Critical patent/MX2022007293A/es
Publication of WO2021131088A1 publication Critical patent/WO2021131088A1/fr

Links

Images

Classifications

    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/02—Aerobic processes
    • C02F3/08—Aerobic processes using moving contact bodies
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/02—Aerobic processes
    • C02F3/12—Activated sludge processes
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W10/00—Technologies for wastewater treatment
    • Y02W10/10—Biological treatment of water, waste water, or sewage

Definitions

  • One embodiment of the present invention relates to a sewage treatment device.
  • a sewage treatment device used for purification treatment of human waste, domestic wastewater, etc.
  • a sewage treatment device equipped with an aeration tank using a flowing carrier is known.
  • the organic component and the nitrogen component in the sewage can be simultaneously removed by flowing a porous carrier to which aerobic bacteria and anaerobic bacteria are attached in the tank body.
  • the carrier flows in the tank body, sewage, microorganisms and oxygen come into contact with each other efficiently, and a high sewage treatment capacity can be realized.
  • the sewage treatment device described in Patent Document 1 is known.
  • a mixed solution of activated sludge and treated water from a carrier fluid aeration tank is sent to a settling tank via a screen portion.
  • a plurality of carriers floating in the sewage also move with the movement of the treated water, but since the carriers cannot pass through the screen portion, they stay in the carrier fluidized aeration tank.
  • the above-mentioned mixed solution is constantly sent to the settling tank via the screen portion, so that a large amount of carriers are gathered in the screen portion, which may cause clogging. It was.
  • One of the problems of the embodiment of the present invention is to prevent clogging of the carrier screen in a sewage treatment apparatus using a flowing carrier.
  • the sewage treatment apparatus includes a tank body divided into at least a first treatment tank and a second treatment tank, a carrier provided inside the first treatment tank, and the first treatment tank.
  • a carrier screen provided between the surface and the second treatment tank, a first air diffuser provided inside the first treatment tank, and a second air diffuser provided inside the second treatment tank. Including the device.
  • the first treatment tank and the second treatment tank may be separated by the carrier screen and may communicate with each other via the carrier screen.
  • the second air diffuser may be placed in close proximity to the carrier screen.
  • the first treatment tank and the second treatment tank may be separated by a partition and may communicate with each other via the carrier screen provided in the partition.
  • the second air diffuser may be arranged in close proximity to the partition.
  • the carrier screen may be arranged at the opening end on the first processing tank side in the opening provided in the partition.
  • the carrier screen may be a mesh member or a punching sheet.
  • the first treatment tank may be an aeration tank using a flowing carrier. Further, the second treatment tank may be a settling tank located downstream of the aeration tank.
  • FIG. 1 is a diagram showing a configuration of a sewage treatment system 10 according to an embodiment of the present invention.
  • the sewage treatment system 10 of the present embodiment includes a regulating tank 11, a carrier fluid aeration tank 12, a settling tank 13, a sludge return device 14, a sludge concentration storage tank 15, a disinfection tank 16, and a discharge tank. Includes 17.
  • the example shown in FIG. 1 is only an example, and the sewage treatment system 10 of the present embodiment is not limited to this example.
  • the adjusting tank 11 is a treatment tank that equalizes fluctuations in water quality by temporarily storing and mixing raw water.
  • the adjusting tank 11 also has a role of making the flow rate of sewage supplied to the carrier fluid aeration tank 12 on the downstream side constant.
  • the carrier fluid aeration tank 12 is a treatment tank for removing organic substances and nitrogen in sewage. Removal of organic matter (oxidative decomposition) is carried out by the action of aerobic bacteria in an aerobic environment. By the action of aerobic bacteria, organic matter is mainly decomposed into water and carbon dioxide. Oxygen required for oxidative decomposition is supplied using an air diffuser or the like. Nitrogen removal (denitrification) is carried out by the action of anaerobic bacteria in an anaerobic environment. Specifically, first, ammonia nitrogen or organic nitrogen is converted into nitrate nitrogen or nitrite nitrogen by nitrifying bacteria. After that, nitrate nitrogen or nitrite nitrogen is reduced to nitrogen gas by denitrifying bacteria. The detailed function of the carrier fluid aeration tank 12 of this embodiment will be described later.
  • the settling tank 13 is a treatment tank in which sludge water, which is a mixture of sludge discharged from the carrier fluid aeration tank 12 and treated water, is allowed to stand, and the sludge is settled and separated by utilizing the difference in density between the sludge and the treated water. Is.
  • the sludge return device 14 is a device for returning the sludge separated in the settling tank 13 to the adjusting tank 11 on the upstream side.
  • the sludge return device 14 is composed of, for example, an air lift pump, a return pipe, and the like.
  • the sludge return device 14 has a function of automatically weighing sludge. With this function, the sludge return device 14 has a function of adjusting the amount of sludge returned to the adjusting tank 11 or the like so that the amount of sludge in the carrier fluid aeration tank 12 becomes a set value.
  • the sludge returning device 14 of the present embodiment can return sludge from both the settling tank 13 and the carrier fluid aeration tank 12. Further, the sludge return device 14 can return the transferred sludge not only to the adjusting tank 11 but also to the carrier fluidized aeration tank 12.
  • the sludge concentration storage tank 15 is a treatment tank having a function of concentrating sludge transferred from the carrier fluid aeration tank 12 and the settling tank 13 by the sludge return device 14 and a function of storing the concentrated sludge.
  • the sludge concentration is increased by a precipitation concentration method in which the desorbed liquid (supernatant liquid) is drawn out after the sludge is precipitated.
  • the sludge transferred from the carrier fluidized aeration tank 12 or the settling tank 13 is temporarily stored in the sludge concentration storage tank 15 and then returned to the adjusting tank 11 or the carrier fluidized aeration tank 12.
  • the disinfection tank 16 is a treatment tank having a function of bringing the treated water discharged from the settling tank 13 into contact with a chemical to disinfect (sterilize) the water to make it hygienic and safe.
  • the discharge tank 17 is a tank for storing the treated water disinfected by the disinfection tank 16.
  • the treated water stored in the discharge tank 17 is discharged to the sewer or the like.
  • the sewage treatment device 100 including the carrier fluid aeration tank 12, the settling tank 13, and the sludge return device 14 described above will be described in detail.
  • FIG. 2 is a diagram showing a configuration of a sewage treatment device 100 according to an embodiment of the present invention.
  • the carrier fluid aeration tank 12 and the settling tank 13 are integrated is shown, but each may be configured as a separate treatment tank.
  • the tank body 110 is a member that serves as an outer frame of the carrier fluid aeration tank 12 and the settling tank 13.
  • the tank body 110 can be made of plastic, steel frame, reinforcing bar, concrete, or the like, but is not limited to these materials.
  • the partition 112 is provided inside the tank body 110. That is, the tank body 110 is divided into a first treatment tank (carrier fluid aeration tank 12) and a second treatment tank (sedimentation tank 13) by the partition 112.
  • the "tank body" in the carrier fluidized aeration tank 12 includes a tank main body 110 and a partition 112 that surround a region that functions as the carrier fluidized aeration tank 12.
  • the tank body 110 and the partition 112 may be integrated or separate. Further, although the example in which the tank main body 110 is divided into two processing tanks by the partition 112 is shown here, it may be divided into three or more processing tanks.
  • the carrier screen 114 is provided on the partition 112 provided inside the tank body 110. That is, the carrier fluid aeration tank 12 and the settling tank 13 communicate with each other via the carrier screen 114.
  • the carrier screen 114 is arranged in the opening 112a provided in the partition 112. Specifically, the carrier screen 114 is arranged at the opening end on the upstream side of the opening 112a, that is, the opening end on the side of the carrier fluid aeration tank 12 (the opening end on the side opposite to the side of the settling tank 13).
  • the carrier screen 114 is a member in which a plurality of through holes of a predetermined size are provided in a plate-shaped member.
  • the carrier screen 114 has a role of preventing the carrier 150 from flowing out from the carrier fluidized aeration tank 12 to the settling tank 13 while allowing sludge water to pass from the carrier fluidized aeration tank 12 to the settling tank 13.
  • a net-like member, a punching sheet (a member obtained by punching a sheet-like member made of metal, resin, or the like) or the like can be used.
  • a raw water inflow pipe 116, a raw water measuring tank 117, and a raw water supply pipe 118 are provided on the upstream side of the tank body 110.
  • the raw water measuring tank 117 has a function of measuring the sewage (raw water) discharged from the upstream equipment (adjustment tank 11 in the present embodiment) via the raw water inflow pipe 116.
  • an appropriate amount of sewage can be supplied to the carrier fluid aeration tank 12 via the raw water supply pipe 118.
  • a tubular member 120 is provided inside the tank body 110 so as to be separated from the inner wall (and partition 112) of the tank body 110.
  • the tubular member 120 is a pipe-shaped member having an opening end in the vertical direction, and is made of a plastic material or the like. As shown in FIG. 2, the tubular member 120 is arranged so as to be submerged in the sewage 160 during operation.
  • the outer shape of the tubular member 120 is not limited to a cylindrical shape, and may be a polygonal shape such as a prismatic shape.
  • the length of the tubular member 120 may be 300 mm or more and 3000 mm or less (preferably 500 mm or more and 2000 mm or less), and the cross-sectional diameter or diagonal length may be 30 mm or more and 250 mm or less (preferably 50 mm or more and 200 mm or less). Just do it.
  • a first air diffuser 130 and a second air diffuser 135a to 135c are provided inside the tank main body 110.
  • the first air diffuser 130 and the second air diffuser 135a to 135c are connected to an air supply pipe 137 connected to a blower (not shown).
  • the first air diffuser 130 is a device that generates air bubbles, and is provided directly below the tubular member 120.
  • the air bubbles generated by the first air diffuser 130 rise toward the sewage surface 160a while passing through the inside of the tubular member 120. Due to such a configuration, the diameter or width of the first air diffuser 130 is smaller than the diameter or width of the tubular member 120.
  • the outer edge of the first air diffuser 130 is located inside the inner edge (outline of the inner wall) of the tubular member 120.
  • the diameter or width of the first air diffuser 130 may be the same as the diameter or width of the tubular member 120.
  • the second air diffuser 135a to 135c are also devices that generate air bubbles.
  • the second air diffuser 135a and 135b are provided in the carrier fluidized aeration tank 12.
  • the second air diffuser 135c is provided in the settling tank 13.
  • the second air diffuser 135a is provided near the inner wall of the tank body 110, and the second air diffuser 135b is provided near the partition 112. That is, the second air diffuser 135a and 135b are provided apart from the tubular member 120.
  • the second air diffuser 135c is arranged in the settling tank 13 in the vicinity of the partition 112. In such an arrangement, the upward flow generated by the air bubbles generated from the second air diffuser 135c forms a vortex in the vicinity of the back surface (the surface on the settling tank 13 side) of the carrier screen 114. Further, the upward flow generated by the air bubbles generates a water flow from the settling tank 13 to the carrier fluidized aeration tank 12 with respect to the carrier screen 114. Therefore, according to the present embodiment, the carrier 150 that has been brought close to and adhered to the surface of the carrier screen 114 (the surface on the carrier fluidized aeration tank 12 side) can be pushed back to the carrier fluidized aeration tank 12 side.
  • the second air diffuser 135c may diffuse air intermittently or continuously.
  • the sludge return device 14 includes air lift pumps 142a and 142b, a sludge return pipe 144, a sludge measuring tank 145, and a sludge supply pipe 146.
  • the air lift pump 142a is arranged inside the carrier fluidized aeration tank 12 and plays a role of sucking up sludge accumulated at the bottom of the carrier fluidized aeration tank 12.
  • the air lift pump 142b is arranged inside the settling tank 13 and plays a role of sucking up sludge accumulated at the bottom of the settling tank 13.
  • the carrier 150 adhering to the carrier screen 114 is detached from the carrier screen 114 by the action of the second air diffuser 135c provided in the settling tank 13.
  • the biofilm (activated sludge) desorbed from the surface of the carrier 150 settles on the bottom of the carrier fluidized aeration tank 12. That is, sludge desorbed from the carrier 150 tends to accumulate in the vicinity of the partition 112. Therefore, the air lift pump 142a provided in the carrier fluid aeration tank 12 is arranged in the vicinity of the partition 112.
  • the sludge return device 14 has a function of returning the sucked sludge to the adjusting tank 11 or the carrier fluidized aeration tank 12.
  • the sludge returning device 14 of the present embodiment shows an example of returning the sucked sludge to the upstream side of the carrier fluidized aeration tank 12.
  • the sludge sucked up by the air lift pumps 142a and 142b is supplied to the sludge measuring tank 145 via the sludge return pipe 144.
  • the sludge measuring tank 145 has a function of measuring the sludge sucked up from the downstream equipment (in the present embodiment, the carrier fluid aeration tank 12 and the settling tank 13).
  • the sludge return pipe 144 is connected to the sludge measuring tank 145 via the sludge concentration storage tank 15 shown in FIG. That is, in the present embodiment, the sludge transferred using the air lift pumps 142a and 142b is temporarily stored in the sludge concentration storage tank 15, and then an appropriate amount of sludge is added to the adjusting tank 11 or the carrier fluid aeration tank 12. It is configured to return. However, not limited to this example, the sludge return device 14 may directly return the sludge to the adjusting tank 11 or the carrier fluid aeration tank 12 without passing through the sludge concentration storage tank 15.
  • the carrier 150 that retains nitrifying bacteria and denitrifying bacteria inside is 20% or more and 35% or less (preferably 25% or more 30) with respect to the volume of the carrier fluid aeration tank 12. It is filled with a filling rate (volume occupancy) of% or less). Experimentally, it has been found that when the filling rate is less than 20%, the denitrification function is lowered, and when the filling rate is more than 35%, the fluidity of the carrier is deteriorated.
  • the carrier 150 preferably has a specific gravity of approximately 1 in consideration of fluidity in the tank.
  • the carrier 150 has a columnar, cylindrical or cylindrical shape having an external dimension of 10 mm or more and 300 mm or less (preferably 10 mm or more and 30 mm or less) and a cross-sectional diameter or diagonal length of 10 mm or more and 50 mm or less (preferably 10 mm or more and 30 mm or less). It is a prismatic porous carrier. If the external dimensions and the diameter of the cross section or the length of the diagonal line exceed these numerical ranges, the fluidity deteriorates, which is not preferable.
  • the carrier 150 for example, urethane resin or polyethylene resin can be used.
  • the carrier 150 has abrasion resistance, and when a urethane resin is used, it is preferable to use an ether-based open-cell polyurethane.
  • a prismatic urethane porous carrier is used.
  • the size and material of the carrier 150 are not limited to the above examples as long as they can retain nitrifying bacteria in the outer layer portion of the carrier 150 and denitrifying bacteria in the inner layer portion.
  • the carrier 150 is made of polyethylene or urethane having an air filtration resistance P of 10 mmH 2 O or more and 100 mm H 2 O or less under the conditions of a sample thickness of 30 mm and a wind speed of 2 m / sec. It is preferable to use a material cut out from a plate-shaped member.
  • the sewage 160 supplied from the raw water supply pipe 118 is stored inside the carrier fluid aeration tank 12 and the settling tank 13.
  • the carrier fluidized aeration tank 12 and the settling tank 13 communicate with each other via the carrier screen 114, the heights of the sewage surface 160a of the carrier fluidized aeration tank 12 and the settling tank 13 are the same.
  • a plurality of carriers 150 are dispersed and exist in the sewage 160.
  • these plurality of carriers 150 flow inside the carrier flow aeration tank 12 by the water flow formed by the bubbles generated from the first air diffuser 130 and the second air diffusers 135a and 135b. To do.
  • the region directly above the first air diffuser 130 and the second air diffuser 135a and 135b is referred to as an "air diffuser region".
  • the region directly above the first air diffuser 130 is referred to as a first air diffuser region 162
  • the regions directly above the second air diffuser 135a and 135b are referred to as second air diffuser regions 162a and 162b, respectively.
  • a sufficient amount of air is sent into the first air diffuser region 162 by the first air diffuser 130 for the activity of aerobic bacteria. Since the first air diffuser region 162 is a region formed by ejecting a large amount of oxygen having high dissolution efficiency, the amount of dissolved oxygen is very high as compared with other regions. In particular, inside the tubular member 120, a large amount of air bubbles are supplied into a narrow space, so that the oxygen concentration becomes extremely high. Therefore, the inner region of the tubular member 120 is maintained in an aerobic environment. In the present embodiment, a region under an aerobic environment, such as the region inside the tubular member 120, is referred to as an "aerobic region".
  • the second air-dissipating regions 162a and 162b of the present embodiment are air-dissipated, they are not as high in dissolved oxygen as the first air-dissipating region 162.
  • the second air diffuser 135a and 135b are air diffusers for the purpose of circulating sewage to the last, and may generate bubbles to the extent that an upward flow can be generated. Therefore, the second air diffuser 135a and 135b may have a smaller air supply amount than the first air diffuser 130.
  • the non-dissipating region 164 is a region in which the amount of dissolved oxygen is smaller than the region inside the tubular member 120, and is maintained in an anaerobic environment.
  • a region under an anaerobic environment such as a region around the tubular member 120, is referred to as an “anaerobic region”. In this embodiment, it is important to maintain the non-dissipating region 164 in an anaerobic environment.
  • the non-dissipating region 164 has a dissolved oxygen amount of 1/3 or less (preferably 1/5 or less, more preferably 1/10 or less) as compared with the first dissipating region 162.
  • the amount of dissolved oxygen in the first air-dissipating region 162 is preferably 0.8 mg / l or more, and the amount of dissolved oxygen in the non-dissipating region 164 is preferably 0.3 mg / l or less.
  • air is selectively diffused inside the tubular member 120 (that is, air is diffused inside the tubular member 120 and around the tubular member 120.
  • an aerobic region having an upward flow specifically, a first aeration region 162 inside the tubular member 120
  • the plurality of carriers 150 circulate so as to rise in the aerobic region and descend in the anaerobic region. That is, the carrier 150 of the present embodiment circulates so as to alternately pass through the aerobic region and the anaerobic region.
  • the carrier 150 When the carrier 150 is in the aerobic region, oxidative decomposition of organic substances (carbon compounds) by aerobic bacteria is actively carried out in the outer layer portion of the carrier 150 (the portion close to the outer surface of the carrier 150). That is, in the case of the carrier fluidized aeration tank 12 of the present embodiment, organic substances are efficiently decomposed inside the tubular member 120 in which the aerobic region is formed. Therefore, inside the tubular member 120, the biochemical oxygen demand (BOD) in the sewage 160 decreases.
  • BOD biochemical oxygen demand
  • ammonia is oxidized instead of organic matter in the outer layer of the carrier 150.
  • nitrification of ammonia nitrogen or organic nitrogen is performed by nitrifying bacteria, which are aerobic bacteria, in the outer layer portion of the carrier 150.
  • nitrification ammonia nitrogen or organic nitrogen is converted to nitrate nitrogen or nitrite nitrogen.
  • the nitrate nitrogen or nitrite nitrogen converted in the outer layer portion of the carrier 150 continues to proceed to the inner layer portion of the carrier 150.
  • the inner layer portion of the carrier 150 is an oxygen-deficient region, that is, an anaerobic region because oxygen is not sufficiently supplied.
  • denitrifying bacteria mainly act to reduce nitrate nitrogen or nitrite nitrogen and convert them into nitrogen gas (denitrification action).
  • the converted nitrogen gas is released into the atmosphere through the sewage 160.
  • a nitrifying action by nitrifying bacteria is performed in the outer layer portion, and a denitrifying action by denitrifying bacteria is performed in the inner layer portion.
  • a nitrifying action by nitrifying bacteria is performed in the outer layer portion, and a denitrifying action by denitrifying bacteria is performed in the inner layer portion.
  • the reason why the carrier 150 is alternately passed through the aerobic region and the anaerobic region will be described.
  • Patent Document 1 assumes that the decrease in the nitrogen removal rate is due to the decrease in the anaerobic region inside the carrier, and adopts an approach of increasing the size of the carrier to relatively expand the anaerobic region inside the carrier. There is.
  • the denitrifying bacteria are activated by intentionally applying stress to the denitrifying bacteria inside the carrier.
  • the present inventors considered that the above-mentioned decrease in the nitrogen removal rate was caused by the denitrifying bacteria becoming accustomed to the oxygen-deficient state.
  • the denitrifying bacterium actively reduces (denitrifies) nitrate nitrogen and the like in order to obtain oxygen necessary for decomposing organic matter or ammonia.
  • the denitrifying bacteria lose their aggressiveness of acquiring oxygen and become low in activity. That is, the present inventors considered that the active nitrification by nitrifying bacteria in the outer layer portion of the carrier 150 may be a factor leading to the hypoactivation of denitrifying bacteria.
  • the present inventors intentionally denitrify the bacteria by intermittently suppressing the progress of nitrification in the outer layer portion of the carrier 150 and creating a state in which nitrate nitrogen or the like is not supplied to the inner layer portion of the carrier 150. I decided to give stress to it. That is, the present inventors can maintain a state in which the denitrifying bacteria actively demand oxygen (that is, an activated state) by intermittently placing the denitrifying bacteria in a state of oxygen deficiency. Thought.
  • the carrier 150 is not always placed in an aerobic environment (aerobic region), but the carrier 150 is placed in an anaerobic environment (anaerobic region) for a certain period of time.
  • the action of denitrifying bacteria in the inner layer of the carrier 150 is activated. That is, the sewage treatment device 100 including the carrier fluidized aeration tank 12 of the present embodiment maintains a state in which the carrier 150 alternately passes through the aerobic region and the anaerobic region, thereby removing the sewage existing inside the carrier 150. It is possible to maintain the activity of nitrogenous bacteria and suppress the decrease of denitrification action over time.
  • FIGS. 3A, 3B and 4 are diagrams showing a specific configuration of the sewage treatment device 100 according to the embodiment of the present invention. More specifically, FIG. 3A is a plan view of the sewage treatment apparatus 100. FIG. 3B is a side view of the sewage treatment device 100. FIG. 4 is a cross-sectional view of the inside of the carrier fluid aeration tank 12 in the sewage treatment apparatus 100 as viewed along the longitudinal direction of the tank body 110.
  • the reference numerals used in FIGS. 3A, 3B and 4 refer to the same elements as those used in FIGS. 1 and 2.
  • tubular members 120a and 120b are arranged inside the tank body 110.
  • a first air diffuser 130a is arranged below the tubular member 120a
  • a first air diffuser 130b is arranged below the tubular member 120b.
  • the number of tubular members 120 is not limited to this example, and one tubular member 120 may be arranged inside the carrier fluid aeration tank 12, or three or more tubular members 120. 120 may be arranged.
  • three air lift pumps 142a to 142c are arranged inside the tank body 110.
  • the air lift pumps 142a and 142c are arranged inside the carrier flow aeration tank 12, and the air lift pump 142b is arranged inside the settling tank 13.
  • the second air diffuser 135a to 135c are arranged inside the tank body 110.
  • the second aeration devices 135a and 135b are both arranged inside the carrier fluid aeration tank 12 in the vicinity of the tank body 110 or the partition 112.
  • the tubular members 120a and 120b (and the first air diffuser 130a and 130b) are arranged on a straight line connecting the pair of second air diffusers 135a and 135b.
  • FIG. 5 is an enlarged view schematically showing the movement of the water flow in the vicinity of the carrier screen 114.
  • the carrier screen 114 is arranged at the opening end 112a-1 on the carrier flow aeration tank 12 side (the opening end on the side opposite to the settling tank 13 side) in the opening 112a of the partition 112.
  • the surface on the side of the carrier fluid aeration tank 12 is the front surface 114a
  • the surface on the side of the settling tank 13 is the back surface 114b.
  • the upper portion of the carrier screen 114 is located above the sewage surface 160a of the sewage 160.
  • the carrier 150 is pushed back to the side of the carrier fluidized aeration tank 12 by the water flow when the sewage surface 160a pushed upward by the upward flow caused by the second air diffuser 135c returns downward. Therefore, when the upper portion of the carrier screen 114 is located above the sewage surface 160a, the water flow can act directly on the carrier screen 114, and the carrier 150 can be easily detached from the carrier screen 114. There is an effect.
  • the carrier screen 114 may be arranged so as to be completely submerged in the sewage 160.
  • the second air diffuser 135c is arranged in the vicinity of the partition 112 inside the settling tank 13. Therefore, the second air diffuser region 162b formed by the second air diffuser 135c passes near the above-mentioned opening 112a.
  • the second air diffuser region 162b formed by the second air diffuser 135c forms an upward flow 160b.
  • the upward flow 160b hits the sewage surface 160a to generate a lateral water flow.
  • a straight flow 160c from the settling tank 13 to the carrier fluidized aeration tank 12 is generated in the settling tank 13.
  • the straight flow 160c toward the carrier fluidized aeration tank 12 acts to push the carrier 150 and sludge clogged in the through holes of the carrier screen 114 back to the carrier fluidized aeration tank 12. That is, the straight flow 160c acts so as not to clog the carrier 150 on the surface 114a of the carrier screen 114, and prevents the carrier screen 114 from being clogged.
  • the sewage treatment device 100 of the present embodiment forms a straight flow 160c from the settling tank 13 toward the carrier fluidized aeration tank 12 by the second aeration device 135c arranged in the settling tank 13, and the eyes of the carrier screen 114. It has a function to prevent clogging.
  • a reverse flow (vortex flow) 160d is generated by the straight flow 160c hitting the back surface 114b of the carrier screen 114.
  • the reversing flow 160d has a role of removing sludge and the like adhering to the back surface 114b of the carrier screen 114, and contributes to the prevention of clogging of the carrier screen 114.
  • the above-mentioned tubular members 120a and 120b, the first air diffuser 130a and 130b, the second air diffuser 135a to 135c, and the air lift are arranged side by side on substantially the same straight line, and the carrier screen 114 is also arranged side by side on the same straight line.
  • the inside of both the tubular members 120a and 120b functions as an aerobic region, and the periphery thereof functions as an anaerobic region. Therefore, it is possible to efficiently improve the activity of the denitrifying bacteria existing inside the carrier 150 inside the carrier fluidized aeration tank 12. That is, it is possible to suppress a decrease in the denitrification function in the sewage treatment using the carrier flow, and it is possible to improve the treatment efficiency of the sewage treatment apparatus 100.
  • the carrier 150 is circulated so as to alternately pass through the aerobic region and the anaerobic region. It is possible.
  • Modification 2 In the present embodiment, an example in which the tubular member 120 is provided inside the carrier fluid aeration tank 12 to circulate the sewage 160 has been described, but the present embodiment is not limited to this configuration.
  • the tubular member 120 may be omitted from the sewage treatment device 100 shown in FIG. 2, and the entire inside of the tank may be used as an air diffuser region. In this case, it is not necessary to distinguish between the first air diffuser 130 and the second air diffusers 135a and 135b, and a common air diffuser can be used.
  • a plurality of linear aeration devices may be arranged at the bottom of the carrier fluid aeration tank 12, or a planar aeration device may be provided so that the entire inside of the tank may be used as an aeration region.
  • the tank body 110 is divided into a carrier fluid aeration tank 12 and a settling tank 13 by the partition 112, and the carrier fluid aeration tank 12 and the settling tank 13 are separated by using the carrier screen 114 provided on the partition 112.
  • the carrier screen 114 can be used to classify the tank body 110 into a carrier fluid aeration tank 12 and a settling tank 13. .
  • the carrier fluid aeration tank 12 and the settling tank 13 communicate with each other via the carrier screen 114.
  • the second air diffuser 135c in the settling tank 13 and forming a straight flow 160c from the settling tank 13 toward the carrier fluidized aeration tank 12, clogging of the carrier screen 114 can be prevented.
  • the second air diffuser 135c in the vicinity of the carrier screen 114, clogging of the carrier screen 114 can be prevented more efficiently.
  • first air diffuser 135a to 135c ... second air diffuser, 137 ... air supply pipe, 142a to 142c ... air lift Pump 144 ... Sludge return pipe, 145 ... Sludge measuring tank, 146 ... Sludge supply pipe, 150 ... Carrier, 160 ... Sewage, 160a ... Sewage surface, 160b ... Upward flow, 160c ... Straight flow, 160d ... Reverse flow, 162 ... 1st air-dissipating region, 162a, 162b ... 2nd air-dissipating region, 164 ... Non-dissipating region

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Biodiversity & Conservation Biology (AREA)
  • Microbiology (AREA)
  • Hydrology & Water Resources (AREA)
  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Biological Treatment Of Waste Water (AREA)
  • Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)

Abstract

L'appareil de traitement des eaux usées de l'invention comprend : un corps de réservoir qui est divisé en au moins un premier réservoir de traitement et un second réservoir de traitement ; un support disposé à l'intérieur du premier réservoir de traitement ; une grille de support disposé entre le premier réservoir de traitement et le second réservoir de traitement ; un premier dispositif de diffusion d'air disposé à l'intérieur du premier réservoir de traitement ; et un second dispositif de diffusion d'air disposé à l'intérieur du second réservoir de traitement. Le premier réservoir de traitement et le second réservoir de traitement peuvent être séparés par la grille de support, et peuvent être reliés par la grille de support.
PCT/JP2020/008721 2019-12-23 2020-03-02 Appareil de traitement des eaux usées WO2021131088A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
MX2022007293A MX2022007293A (es) 2019-12-23 2020-03-02 Dispositivo de tratamiento de aguas residuales.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2019231226A JP7376342B2 (ja) 2019-12-23 2019-12-23 汚水処理装置
JP2019-231226 2019-12-23

Publications (1)

Publication Number Publication Date
WO2021131088A1 true WO2021131088A1 (fr) 2021-07-01

Family

ID=76540553

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2020/008721 WO2021131088A1 (fr) 2019-12-23 2020-03-02 Appareil de traitement des eaux usées

Country Status (4)

Country Link
JP (1) JP7376342B2 (fr)
MX (1) MX2022007293A (fr)
TW (1) TW202124296A (fr)
WO (1) WO2021131088A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11290882A (ja) * 1998-04-13 1999-10-26 Kubota Corp 窒素除去装置
JPH11290880A (ja) * 1998-04-13 1999-10-26 Kubota Corp 窒素除去装置
JP2011212670A (ja) * 2010-03-19 2011-10-27 Swing Corp 排水処理装置及び排水処理方法

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5541304Y2 (fr) * 1976-05-24 1980-09-27
JPH07136681A (ja) * 1993-11-19 1995-05-30 Yanmar Diesel Engine Co Ltd 回分式汚水処理装置
JP2003001084A (ja) 2001-06-15 2003-01-07 Ngk Insulators Ltd 嫌気槽の槽内液攪拌システム
JP2003205298A (ja) 2002-01-15 2003-07-22 Uno Juko Kk 家畜尿汚水の処理装置
JP4765041B2 (ja) 2004-11-01 2011-09-07 株式会社西原環境 水処理装置
JP5053911B2 (ja) 2008-04-07 2012-10-24 大栄産業株式会社 浄化槽

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11290882A (ja) * 1998-04-13 1999-10-26 Kubota Corp 窒素除去装置
JPH11290880A (ja) * 1998-04-13 1999-10-26 Kubota Corp 窒素除去装置
JP2011212670A (ja) * 2010-03-19 2011-10-27 Swing Corp 排水処理装置及び排水処理方法

Also Published As

Publication number Publication date
JP7376342B2 (ja) 2023-11-08
TW202124296A (zh) 2021-07-01
JP2021098166A (ja) 2021-07-01
MX2022007293A (es) 2022-07-27

Similar Documents

Publication Publication Date Title
JP4508694B2 (ja) 水処理方法および装置
CN112209573B (zh) 一种养殖尾水处理系统
US20070017867A1 (en) Submerged attached growth bioreactor
JP7015117B2 (ja) 有機性排水処理方法及び有機性排水処理システム
JP5048708B2 (ja) 浄化槽
KR101087024B1 (ko) 담체부재와 분리막을 구비하는 고도하수처리시설
JP2007237158A (ja) 有機物と窒素含有化合物の同時分解による汚水の生物学的浄化方法
WO2021131088A1 (fr) Appareil de traitement des eaux usées
WO2021074307A1 (fr) Système de traitement d'eaux usées
WO2021131090A1 (fr) Réservoir d'aération, appareil de traitement des eaux usées et procédé de traitement des eaux usées
JP3963667B2 (ja) 汚水処理装置及びその運転方法
Sekoulov et al. Application of biofiltration in the crude oil processing industry
TWI838480B (zh) 曝氣槽、汙水處理裝置及汙水處理方法
KR200171727Y1 (ko) 축산분뇨 처리장치
JP2006218347A (ja) 移流バッフル及び汚水浄化槽
JP2017205734A (ja) 排水処理装置
JP2839065B2 (ja) 浄化槽
JP2839052B2 (ja) 浄化槽
JP2006075784A (ja) バイオ浄化循環システムトイレ
JP4872757B2 (ja) 多段式生物処理装置および多段式生物処理方法
KR970003588Y1 (ko) 오수 분뇨 합병 정화조
JPH07313991A (ja) 汚水の処理方法
JP2005046736A (ja) 排水処理装置および排水処理方法
JPH10128355A (ja) 浄化槽
JP2644103B2 (ja) 浄化槽

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 20907726

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 20907726

Country of ref document: EP

Kind code of ref document: A1