WO2023120681A1 - 排水処理システム及び排水処理方法 - Google Patents

排水処理システム及び排水処理方法 Download PDF

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Publication number
WO2023120681A1
WO2023120681A1 PCT/JP2022/047505 JP2022047505W WO2023120681A1 WO 2023120681 A1 WO2023120681 A1 WO 2023120681A1 JP 2022047505 W JP2022047505 W JP 2022047505W WO 2023120681 A1 WO2023120681 A1 WO 2023120681A1
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Prior art keywords
gas
ammonia concentration
blower
water
tank
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Ceased
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PCT/JP2022/047505
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English (en)
French (fr)
Japanese (ja)
Inventor
剛 市成
高裕 牛田
博之 齊藤
宏幸 新井
広大 林
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Fujiclean Co Ltd
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Fujiclean Co Ltd
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Priority to JP2023569558A priority Critical patent/JPWO2023120681A1/ja
Publication of WO2023120681A1 publication Critical patent/WO2023120681A1/ja
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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
    • 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
    • C02F3/12—Activated sludge processes
    • 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
    • C02F3/34—Biological treatment of water, waste water, or sewage characterised by the microorganisms used
    • 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

  • the present invention relates to a wastewater treatment system and a wastewater treatment method.
  • a biological treatment method that decomposes and removes contaminants in sewage with a biofilm is known as a method for treating sewage (wastewater) such as domestic wastewater.
  • sewage wastewater
  • air is supplied from a blower to the aeration tank to promote the biological treatment of sewage.
  • Patent Document 1 in a sewage treatment apparatus comprising a primary treatment tank, an aeration tank, and a blower, a water amount detection means for detecting the amount of inflow water in the primary treatment tank, and a blower based on a detection signal from the detection means and a control means for controlling the air flow rate of the sewage treatment apparatus.
  • the treatment function in the biological treatment tank can be stably maintained by adjusting the amount of aeration in the aeration tank according to the load to be treated.
  • the amount of load to be treated is determined based on the amount of inflow water. Therefore, if the concentration of contaminants contained in the sewage fluctuates, the amount of load cannot be strictly grasped. Can not. As a result, the amount of load to be treated does not match the amount of aeration required for the treatment, and the quality of the treated water cannot be controlled in some cases.
  • the present invention provides a wastewater treatment system and a wastewater treatment method capable of adjusting an appropriate amount of aeration according to the concentration of pollutants contained in wastewater and maintaining the water quality of treated water for a long period of time.
  • the task is to provide
  • the present inventors measured the ammonia concentration in the aerobic treatment unit (contact filter bed tank) and supplied gas from the blower according to the ammonia concentration. The inventors have found that the above problem can be solved by determining whether or not. The present invention has been completed based on such findings.
  • the present invention is as follows.
  • a wastewater treatment system comprising a wastewater treatment apparatus using a biofilm method and a blower for supplying a gas containing oxygen to the wastewater treatment apparatus,
  • the blower includes a discharge port, a gas discharge section for discharging the gas through the discharge port, and a control section for controlling the operating state of the gas discharge section,
  • the waste water treatment device is An anaerobic treatment unit that performs anaerobic treatment; an aerobic treatment unit that receives the water treated by the anaerobic treatment unit and performs nitrification using the gas from the blower;
  • the aerobic treatment unit contains an ammonia concentration measuring device capable of directly or indirectly measuring the concentration of ammonia in the water treated by the anaerobic treatment unit, and the aerobic treatment of the gas from the blower.
  • An air diffuser is placed to supply the inside of the When the control unit determines that the nitrification is insufficient from the ammonia concentration measured by the ammonia concentration measuring device, the gas is supplied from the gas discharge unit to the aerobic treatment unit, and the ammonia When it is determined that the nitrification is completed from the ammonia concentration measured by the concentration measuring device, the gas supply from the gas discharge part is stopped. Wastewater treatment system. Section 2. Item 1. The wastewater treatment system according to Item 1, The control unit further has a function of forcibly supplying gas from the gas discharge unit for a predetermined period of time when a set time has elapsed after gas supply from the gas discharge unit is stopped. processing system. Item 3.
  • the wastewater treatment method according to Item 3 A method for treating wastewater, wherein gas is forcibly supplied for a predetermined period of time after a set period of time has elapsed after stopping the supply of gas from the blower to the aerobic treatment section.
  • Item 5. Item 3. The wastewater treatment method according to Item 3, The difference between the ammonia concentration (ammonia concentration upper limit value) at which gas supply from the blower to the aerobic treatment unit is started and the ammonia concentration (ammonia concentration lower limit value) at which gas supply from the blower to the aerobic treatment unit is stopped is A wastewater treatment method, wherein the ammonia concentration is controlled to be 0.1 to 2.3 mg/L.
  • the wastewater treatment system of the present invention it is possible to adjust the appropriate amount of aeration according to the concentration of pollutants contained in the sewage, and to maintain the quality of the treated water for a long period of time.
  • the ammonia concentration is measured by an ammonia concentration measuring device installed in the aerobic treatment unit (contact filter bed tank), and whether or not to supply gas from the blower is determined according to the measured ammonia concentration.
  • the treatment function in the aerobic treatment section can be stabilized, so that the water quality of the treated water can be maintained for a long period of time.
  • energy can be saved by adjusting the amount of aeration to an appropriate level according to load fluctuations.
  • FIG. 3 is an explanatory diagram showing a processing flow of the wastewater treatment device 800 as one embodiment; It is a figure which shows the schematic composition which looked at the waste water treatment apparatus 800 from the side.
  • FIG. 3 is a diagram showing the schematic composition of the waste water treatment device 800 viewed from the BB cross section in FIG. 2 toward the contaminant removal tank 810 side.
  • 5 is a schematic diagram showing an example of a blower 500;
  • FIG. 1 is a graph showing nitrification rates under Conditions 1 to 4 in Test Example 1.
  • FIG. 5 is a diagram showing blower operating ratios and blower stop ratios under Conditions 1 to 5 in Test Example 1.
  • FIG. FIG. 10 is an operation flow diagram for explaining condition A in Test Example 2;
  • FIG. 10 is a diagram showing the rate of stopping aeration under conditions A to D at low load (200 L/day) and the rate of dissolved oxygen (DO) exceeding 3 mg/L in Test Example 2.
  • FIG. 4 is a diagram showing the concentration of (SS); FIG.
  • FIG. 10 is a diagram showing the rate of stopping aeration under conditions A to D at medium load (500 L/day) and the rate of dissolved oxygen (DO) exceeding 3 mg/L in Test Example 2;
  • Test Example 2 biochemical oxygen demand (BOD), total nitrogen (TN), ammonium nitrogen (NH -N ), and suspended solids under conditions A to D at medium load (500 L/day)
  • FIG. 4 is a diagram showing the concentration of (SS);
  • FIG. 10 is a diagram showing the rate of stopping aeration under conditions A and D under high load (800 L/day) and the rate of dissolved oxygen (DO) exceeding 3 mg/L in Test Example 2.
  • FIG. 4 is a diagram showing the concentration of (SS);
  • FIG. 1 is an explanatory diagram showing the treatment flow of a wastewater treatment apparatus 800 as an embodiment.
  • the wastewater treatment device 800 of this embodiment uses the biofilm method to purify wastewater from general households (such a device is also called a “septic tank”). Since the waste water treatment equipment 800 performs purification treatment through a plurality of steps, in order from the upstream side (left side in FIG. 1), a contaminant removal tank 810, an anaerobic filter bed tank 820, and a contact filter bed tank 830, a treatment tank 840, and a disinfection tank 850 are accommodated.
  • Wastewater that has flowed into the wastewater treatment apparatus 800 is sequentially treated in a contaminant removal tank 810, an anaerobic filter tank 820, a contact filter tank 830, a treatment tank 840, and a disinfection tank 850, and then discharged to the outside of the wastewater treatment apparatus 800. is discharged to Hereinafter, the water flowing through each water treatment tank is called “water to be treated” or simply "water”.
  • a blower 500 is connected to the waste water treatment device 800 .
  • the waste water treatment device 800 uses the oxygen-containing gas (here, air) supplied by the blower 500 to proceed with the purification process.
  • the entirety of the waste water treatment device 800 and the blower 500 will be referred to as a "waste water treatment system 900".
  • FIG. 2 shows a schematic configuration of the waste water treatment device 800 viewed from the side.
  • FIG. 3 shows a schematic configuration of the waste water treatment apparatus 800 viewed from the BB cross section in FIG. 2 toward the contaminant removal tank 810 side.
  • the Z direction indicates the upward vertical direction
  • the X direction indicates the longitudinal direction (horizontal direction) of the wastewater treatment device 800
  • the Y direction indicates the X direction and the Z direction.
  • the X direction side is also referred to as "+X side”
  • the side opposite to the X direction is also referred to as " ⁇ X side”.
  • the contaminant removal tank 810 (Fig. 1) is a water treatment tank that separates contaminants in waste water. As shown in FIG. 2 , the contaminant removal tank 810 is arranged at the most upstream part of the waste water treatment device 800 . Wastewater (also called sewage) from the inlet 802 first flows into the contaminant removal tank 810 .
  • the contaminant removal tank 810 has solid-liquid separation means such as an inflow baffle 812, etc., and separates contaminants in the waste water from the water to be treated.
  • the water from which the contaminants have been separated (removed) is transferred to the anaerobic filter bed tank 820 through the advection opening 814 provided on the +X side of the contaminant removal tank 810 .
  • the anaerobic filter bed tank 820 (Fig. 1) is a water treatment tank that performs anaerobic treatment with anaerobic microorganisms. As shown in FIG. 2, the anaerobic filter bed tank 820 has filter media 822 to which anaerobic microorganisms adhere. Anaerobic treatment decomposes organic matter in the water to be treated. In addition, as will be described later, in the anaerobic filter bed tank 820, water (water containing nitrate ions (also called nitrified liquid)) aerobically treated in the contact filter bed tank 830 is mixed with a circulating air lift pump 860 to remove contaminants. It flows in through tank 810 .
  • water water containing nitrate ions (also called nitrified liquid)
  • a circulating air lift pump 860 to remove contaminants. It flows in through tank 810 .
  • nitrate ions are reduced by the action of denitrifying bacteria contained in anaerobic microorganisms to generate nitrogen gas, and the generated nitrogen gas is released into the air (so-called denitrification).
  • the filter media 822 can capture suspended matter in the water to be treated.
  • the contaminant removal tank 810 and the anaerobic filter bed tank 820 are collectively referred to as an anaerobic treatment section 880 .
  • a side wall 803 on the downstream side (+X side) of the anaerobic filter bed tank 820 divides the tank main body 801 into two perpendicularly to the X direction (hereinafter, the side wall 803 is referred to as " Also referred to as "partition plate 803").
  • partition plate 803 On the downstream side (+X side) of the partition plate 803, side wall portions 843, 842, and 844 are fixed that are arranged in a substantially U shape and protrude from the partition plate 803 to the +X side when viewed from above.
  • a space surrounded by the partition plate 803 and the side walls 843 , 842 , 844 corresponds to the treated water tank 840 .
  • the third side wall portion 843 FIG.
  • the fourth side wall portion 844 is the +X side wall of the treated water tank 840 .
  • the central portion of the partition plate 803, that is, the portion between the third side wall portion 843 and the fourth side wall portion 844 (the portion that functions as the side wall of the treated water tank 840) is also referred to as the “first side wall portion 841”. call.
  • a lower portion 849 of the treated water tank 840 (Fig. 2) has a so-called hopper structure (hereinafter, this lower portion 849 is also referred to as "hopper portion 849").
  • a advection opening 824 is formed in a portion forming a boundary between the anaerobic filter bed tank 820 and the contact filter bed tank 830 in the partition plate 803 (FIG. 2).
  • the advection opening 824 is arranged above the partition plate 803 , and the water surface WL is normally a low water level LWL, which will be described later, and the low water level LWL is located in the middle of the advection opening 824 .
  • the water treated in the anaerobic filter bed tank 820 advects to the catalytic filter bed tank 830 through the advection opening 824 .
  • the contact filter bed tank 830 (FIG. 1) is a water treatment tank that performs aerobic treatment with aerobic microorganisms, and can also be called an aerobic treatment section.
  • ammonium ions contained in the water to be treated are oxidized by the action of nitrifying bacteria contained in aerobic microorganisms to produce nitrite ions and nitrate ions (nitrification). Therefore, as nitrification progresses, the ammonia concentration decreases.
  • a grid-like pedestal 839 is provided at the bottom of the contact filter bed tank 830 (above the advection opening 836 that communicates the bottom of the contact filter bed tank 830 and the bottom of the treated water tank 840.
  • An air diffuser 834 is mounted on the pedestal 839 . Further, a contact material 832 and an aerobic filter material 833 for retaining microorganisms are arranged on the pedestal 839 (air diffuser 834). Hereinafter, the contact member 832 and the aerobic filter member 833 are collectively referred to as a holding member 835 . Aerobic filter media 833 is positioned on cradle 839 and contact member 832 is positioned on aerobic filter media 833 .
  • the air diffuser 834, the contact material 832 and the aerobic filter material 833 are arranged on both sides (+Y side and -Y side) of the treated water tank 840 (FIG. 4).
  • the aerobic filter material 833 is also arranged on the +X side of the treated water tank 840 .
  • the letter “p” is added to the end of the code for the member on the +Y side
  • the letter “p” is added to the end of the code for the member on the -Y side.
  • the contact material 832 on the +Y side is also called a contact material 832p
  • the aerobic filter material 833 arranged below this contact material 832p is also called an aerobic filter material 833p.
  • the ⁇ Y side contact member 832 is also called a contact member 832m
  • the aerobic filter member 833 arranged below the contact member 832m is also called an aerobic filter member 833m.
  • An ammonia concentration measuring device 831 is installed in the contact filter bed tank 830 for the purpose of grasping the ammonia concentration.
  • an ammonia concentration measuring instrument refers to an instrument or device capable of directly or indirectly measuring an ammonia concentration. By measuring the ammonia concentration in the contact filter bed tank 830, the degree of progress of nitrification can be grasped. Instruments or devices capable of directly measuring ammonia concentration include, for example, ammonia sensors and the like.
  • Methods for measuring ammonia, particularly ammonia nitrogen, in ammonia sensors include the absorption photometry method, the potentiometric method (diaphragm electrode method), the ion electrode method, the coulometric titration method, the ion chromatography method, and the like. Of these measurement methods, the ion electrode method is preferred because it does not require reagents or sampling and enables continuous measurement.
  • an electrode type ammonia sensor is preferably used as the ammonia sensor.
  • Instruments or devices that can indirectly measure ammonia concentration include, for example, pH sensors, EC sensors, and the like.
  • the ammonia concentration measuring device 831 may be installed at a position where the ammonia concentration in the contact filter bed tank 830 can be grasped.
  • the water to be treated after aerobic treatment is stored. It can be installed in the subsequent treatment water tank 840, the disinfection tank 850, and the like.
  • the ammonia concentration measuring device 831 is preferably installed near the water surface WL of the contact filter bed tank 830 .
  • not only one ammonia concentration measuring device 831 but also two or more can be installed.
  • the ammonia concentration measured by the two ammonia concentration measuring devices 831 is averaged to enable more accurate measurement.
  • sufficient control is possible by installing only one ammonia concentration measuring device in the contact filter bed tank of the septic tank.
  • a gas containing oxygen (here, air) is supplied from the blower 500 to the diffuser 834 (FIG. 3).
  • the connection between the diffuser 834 and the blower 500 will be described later.
  • the air diffuser 834 is constructed using a pipe having a plurality of holes (not shown) provided on the bottom surface. Arrows in FIG. 3 indicate the flow of water.
  • the air diffuser 834 supplies air bubbles containing oxygen to the holding member 835 .
  • a large number of air bubbles discharged from the air diffuser 834 pass through the holding member 835 (members 832 and 833) and reach the water surface WL. The movement of the air bubbles creates water flow and agitates the water in the contact filter bed tank 830 .
  • the aerobic microorganisms held by the holding member 835 use the oxygen contained in the air bubbles to decompose organic matter in the water to be treated.
  • nitrifying bacteria contained in aerobic microorganisms oxidize ammonium ions contained in the water to be treated to produce nitrite ions and nitrate ions (nitrification).
  • Water containing nitrate ions (nitrified liquid) is transferred to the contaminant removal tank 810 by a circulation air lift pump 860, which will be described later.
  • the contact member 832 is formed by arranging a plurality of resin plates having a large number of wavy irregularities side by side at predetermined intervals.
  • the contact member 832 is fixed inside the contact filter bed tank 830 (specifically, to the partition plate 803 and the side walls 843 and 844) by a fixture (not shown).
  • the aerobic filter medium 833 is a cylindrical net-like skeleton made of resin. A space between the mount 839 and the contact member 832 is filled with a large number of cylindrical members (aerobic filter media 833). The aerobic filter material 833 is also filled in the space between the hopper portion 849 ( FIG. 2 ) of the treated water tank 840 and the tank main body 801 . When the wastewater treatment device 800 is completed, a large number of aerobic filter media 833 are surrounded by the tank body 801, the mount 839, the contact material 832, and the treated water tank 840 (side walls 843, 842, 844). The aerobic filter medium 833 is substantially stationary within the contact filter bed tank 830 without being able to flow freely. Since it is almost stationary in the contact filter bed tank 830 in this way, it can be said that the aerobic filter medium 833 is fixed in the contact filter bed tank 830 .
  • the air diffuser 834 is arranged below the aerobic filter medium 833 . Air bubbles discharged from the air diffuser 834 contact the aerobic filter medium 833 . As described above, the aerobic filter medium 833 has a net-like structure. Therefore, the air bubbles are subdivided by the net-like aerobic filter media 833 . As a result, oxygen dissolution efficiency can be improved.
  • the retention member preferably includes a mesh member having a mesh-like structure (eg, the aerobic filter media 833), and the air diffuser 834 is positioned below the mesh member.
  • the water treated in the contact filter bed tank 830 advects to the treated water tank 840 through the advection opening 836.
  • the treated water tank 840 (Fig. 1) is a water treatment tank that temporarily retains the water advected from the contact filter bed tank 830 and sediments and separates solid matter (for example, sludge, suspended matter, etc.) in the water.
  • treated water tank 840 has a hopper portion 849 .
  • the second side wall portion 842 is inclined with respect to the vertical direction, and the cross-sectional area (horizontal cross-sectional area) of the treated water tank 840 is smaller the closer to the bottom of the treated water tank 840 . Further, as shown in FIG.
  • each of the third side wall portion 843 and the fourth side wall portion 844 is also inclined with respect to the vertical direction.
  • This lower portion 849L has a so-called three-sided hopper structure. Separated solids in the treated water tank 840 are collected at the bottom of the treated water tank 840 by side walls 842 , 843 , 844 .
  • the lower end of the partition plate 803 (first side wall portion 841) is connected to the bottom surface of the tank body 801.
  • the lower ends of the other side walls 842, 843, 844 are separated from the bottom surface of the tank main body 801.
  • a gap between the lower ends of the side walls 842 , 843 , 844 and the bottom surface of the tank body 801 corresponds to the advection opening 836 .
  • the treated water tank 840 is provided with a circulation air lift pump 860 .
  • the circulation air lift pump 860 has a vertical pipe 861 that extends upward from the bottom of the treated water tank 840 to above the water surface (high water level HWL, which will be described later).
  • a transfer pipe 863 extending with a gentle downward slope to above the water surface of the contaminant removal tank 810 (specifically, above the high water level HWL). is connected.
  • the end of the vertical tube 861 on the bottom side forms a suction port 862 .
  • the end of the commutation pipe 863 on the contaminant removal tank 810 side forms a discharge port 864 .
  • a circulating air lift pump 860 transports (returns) solids or water (nitrified liquid) from the bottom of the treatment tank 840 to the decontamination tank 810 .
  • circulation airlift pump 860 operates using gas supplied by blower 500 (FIG. 3). The connection between circulation air lift pump 860 and blower 500 will be described later.
  • the disinfection tank 850 (Fig. 1) is a water treatment tank that disinfects water to be treated.
  • the disinfection tank 850 is arranged above the treatment tank 840 (FIG. 2).
  • the disinfection bath 850 has a discharge airlift pump 870 .
  • a suction port 872 of the discharge airlift pump 870 is arranged at a predetermined height (called a low water level LWL) in the treatment tank 840, and an outlet port 874 of the discharge airlift pump 870 is arranged upstream of the disinfection tank 850. ing. Water near the water surface WL of the treated water tank 840 (water from which solid matter has been separated) flows into the discharge air lift pump 870 from the suction port 872 .
  • the water surface WL can drop to a low water level LWL.
  • the water that has flowed into the discharge air lift pump 870 is gradually transferred to the disinfection bath 850 by the discharge air lift pump 870 .
  • Discharge airlift pump 870 operates utilizing gas supplied by blower 500 (FIG. 3).
  • the disinfection tank 850 also has a drug cylinder 854 filled with a disinfectant (for example, a solid chlorine agent).
  • a disinfectant for example, a solid chlorine agent
  • the water level WL of the water treatment tanks 810, 820, 830, 840 on the upstream side of the discharge air lift pump 870 temporarily Generally, it can rise above the normal water level (low water level LWL in the figure).
  • the water level WL can rise up to the high water level HWL (water levels below the high water level HWL do not overflow).
  • the water levels of the plurality of water treatment tanks 810, 820, 830, and 840 temporarily rise, thereby suppressing an increase in the amount of outflow per unit time from the contact filter bed tank 830.
  • the discharge air lift pump 870 operates as a mechanism (referred to as a "peak cut mechanism") that suppresses an increase in the amount of outflow per unit time from the contact filter bed tank 830 due to peak inflow.
  • an air supply port 610 is provided in the upper portion of the tank body 801 .
  • a blower 500 is connected to the air supply port 610 via a connection pipe 502 .
  • the blower 500 has a drive section 510 and a control section 520 .
  • the drive unit 510 is a device that has a solenoid, a vibrator, a diaphragm, and a compression chamber (not shown) and pumps air.
  • the drive unit 510 is not limited to a diaphragm-type device, and various air-pumping devices such as a rotary type can be employed.
  • the control unit 520 is a device that controls the driving unit 510 .
  • Control unit 520 includes a timer, receives power supply from a household power source, and operates drive unit 510 (details will be described later).
  • a dedicated electronic circuit is employed as the control unit 520 .
  • a computer having a processor (eg, CPU) and a data storage device (eg, flash memory) may be employed as controller 520 .
  • a joint (not shown) is connected to the air supply port 610 via a pipe.
  • This joint is a joint that branches into three pipe lines, and three pipes corresponding to the three branch ports are connected to the joint.
  • a diffusion valve 620 is connected to the first pipe, a circulation valve 630 is connected to the second pipe, and a discharge valve 640 is connected to the third pipe.
  • the diffuser valve 620 is a valve that distributes gas to two pipelines. By manipulating the handle of the diffuser valve 620, the balance of distribution to the two lines can be adjusted.
  • the diffuser valve 620 is connected to two pipes respectively corresponding to the two branch ports.
  • the +Y side air pipe 622p is connected to the +Y side pipe
  • the -Y side air pipe 622m is connected to the -Y side pipe.
  • the +Y side air supply pipe 622p is connected to the +Y side air diffuser 834p
  • the -Y side air supply pipe 622m is connected to the -Y side air diffuser 834m.
  • the diffusion valve 620 distributes the gas supplied from the blower 500 to the +Y side diffuser 834p and the ⁇ Y side diffuser 834m.
  • a user eg, a manager of the wastewater treatment device 800
  • a circulation air lift pump 860 is connected to the circulation valve 630 via an air supply pipe 632 (FIG. 3).
  • the air supply pipe 632 guides the gas supplied by the blower 500 and passed through the circulation valve 630 to the circulation air lift pump 860 .
  • the user adjusts the amount of gas supplied to the circulation air lift pump 860 per unit time, that is, the transfer amount (circulating water amount) per unit time by the circulation air lift pump 860. can do.
  • a discharge air lift pump 870 is connected to the discharge valve 640 via an air supply pipe.
  • the user can adjust the transfer amount (discharge amount) per unit time by the discharge air lift pump 870 by adjusting the opening degree of the discharge valve 640 .
  • the transfer amount per unit time by the discharge air lift pump 870 may be smaller than the inflow amount per unit time during normal inflow or peak inflow, without fine adjustment of the opening of the discharge valve 640. Good water quality can be achieved. Therefore, the opening of the discharge valve 640 may be adjusted to a predetermined opening. Also, the transfer amount per unit time by the circulation air lift pump 860, that is, the opening degree of the circulation valve 630, is preferably adjusted so as to achieve appropriate water treatment, as described later.
  • the diffusion valve 620 the diffusion state of the contact filter bed tank 830 may be observed, and adjustment may be made so that the diffusion is not biased toward either the +Y side or the -Y side.
  • the blower 500 has a performance capable of supplying a sufficient amount of air to the contact filter bed tank 830 while adjusting the opening of the circulation valve 630 and the opening of the discharge valve 640 to appropriate openings.
  • a blower with A user of the waste water treatment device 800 (for example, a manager of the waste water treatment device 800) adjusts the opening degree of the circulation valve 630 and the opening degree of the discharge valve 640 to appropriate opening degrees, and then opens the diffusion valve 620. Just adjust.
  • FIG. 4 is a schematic diagram illustrating an example blower 500 .
  • the blower 500 has a drive section 510, a discharge port 515 fixed to the drive section 510, a power cable 530 connected to the drive section 510, and a control section 520 connected to the middle of the power cable 530.
  • Drive unit 510 ejects gas containing oxygen (here, air) through ejection port 515 .
  • a connection pipe 502 ( FIG. 3 ) is connected to the discharge port 515 .
  • the drive section 510 will also be referred to as a "gas discharge section 510".
  • the control section 520 has a function of controlling the operating state of the gas discharge section 510 .
  • the control unit 520 grasps the state of nitrification according to the ammonia concentration in the contact filter bed tank 830, and either discharges gas (oxygen) from the discharge port 515 or controls gas (oxygen) from the discharge port 515. Determines whether to stop the ejection of
  • the state in which the gas is discharged from the discharge port 515 is called the "discharge state”
  • the state in which the gas discharge from the discharge port 515 is stopped is called the "stop state”.
  • the controller 520 has a switch (not shown) (for example, an electromagnetic relay, a solid state relay, etc.) that opens and closes the electrical connection of the power cable 530 connected to the gas discharger 510 .
  • Control unit 520 closes the switch when the ammonia concentration exceeds a predetermined value (upper limit) (nitrification has not progressed sufficiently), thereby supplying power to gas discharge unit 510 and discharging from discharge port 515 .
  • a gas (oxygen) is discharged (a discharge state is realized).
  • the control unit 520 opens the switch so that power is not supplied to the gas discharge unit 510 and the discharge port 515 to stop discharging gas (oxygen) from (to achieve a stopped state).
  • the upper limit value of the ammonia concentration and the lower limit value of the ammonia concentration are preferably set so that the aerobic treatment by the contact filter bed tank 830 proceeds appropriately, and more preferably determined experimentally in advance.
  • the target of total nitrogen (TN) of the discharged water quality is 10 mg / L
  • the ammonia concentration in the contact filter bed tank is 1/10 of the target, that is,
  • the upper and lower limits of the ammonia concentration may be set so that the average concentration is around 1 mg/L (see Examples below).
  • the upper limit of the ammonia concentration is in the range of 0.9 mg/L or more and 3.1 mg/L or less
  • the lower limit of the ammonia concentration is in the range of 0.7 mg/L or more and 0.85 mg/L or less.
  • the upper and lower limits of the ammonia concentration are a combination of an upper limit of 0.9 mg/L and a lower limit of 0.8 mg/L, an upper limit of 1.1 mg/L and a lower limit of 0.8 mg.
  • the upper limit and lower limit of the ammonia concentration can be set higher than the above values.
  • the target of the total nitrogen (TN) of the effluent quality is 40 mg / L
  • the ammonia concentration in the contact filter tank is 1/10 of the target, that is, around 4 mg / L on average. What is necessary is just to set the upper limit and lower limit of ammonia concentration.
  • the upper limit and lower limit of the ammonia concentration may be set so that the average ammonia concentration in the contact filter bed tank is around 4 mg/L.
  • the upper limit of the ammonia concentration is in the range of 3.9 mg/L or more and 4.1 mg/L or less
  • the lower limit of the ammonia concentration is in the range of 3.7 mg/L or more and 3.85 mg/L or less.
  • the controller 520 determines that the nitrification is insufficient from the ammonia concentration measured by the ammonia concentration measuring device 831 installed in the contact filter bed tank 830, the aerobic Gas is supplied to the treatment unit (contact filter bed tank 830), and when it is determined that nitrification is completed from the ammonia concentration measured by the ammonia concentration measuring device 831, the gas from the gas discharge unit 510 is It has a function to stop the supply.
  • the amount of aeration can be adjusted according to the concentration of pollutants contained in the sewage, and energy can be saved by suppressing excessive aeration.
  • gas oxygen
  • water in the contact filter bed tank 830 is agitated, and circulating water is transferred.
  • the gas (oxygen) supply to the contact filter bed tank 830 is stopped, the water agitation in the contact filter bed tank 830 is stopped, and the transfer of circulating water is also stopped. be.
  • aerobic microorganisms use the gas (oxygen) supplied while the blower is in the discharge state to proceed with aerobic treatment. Since the supply of oxygen is stopped during the period in which the blower operating state is in a stopped state, the dissolved oxygen content of the water in the contact filter bed tank 830 gradually decreases, and the dissolved oxygen content of the water in the contact filter bed tank 830 is extremely low (for example, less than 1 mg/L), the progress of aerobic treatment may be suppressed even in the discharge state.
  • oxygen oxygen
  • the inflow load is within the design range, the amount of dissolved oxygen in the water in the contact filter tank 830 should not be insufficient even during the period when the blower operation state is stopped (that is, aerobic treatment progresses), it is preferable to forcibly supply gas (oxygen) for a period of time if the shutdown state persists for a period of time.
  • gas oxygen
  • the period from when the blower is stopped to when gas (oxygen) supply is forcibly started (hereinafter referred to as “stopped state duration"), and when gas (oxygen) supply is forcibly started. , until the gas (oxygen) supply is stopped (hereinafter referred to as “discharge state duration”) is preferably set so that the aerobic treatment by the contact filter bed tank 830 proceeds appropriately. More preferably, it is determined experimentally in advance. For example, the stop state duration is set within a range of 30 minutes or more and 330 minutes or less according to the amount of water flowing into the contact filter bed tank 830, and the discharge state duration is set within a range of 5 minutes or more and 40 minutes or less. set.
  • the duration of the stopped state is short.
  • the stop state duration and the dispense state duration are a combination of 60 minutes of the stop state duration and 20 minutes of the dispense state duration, 180 minutes of the stop state duration and 20 minutes of the dispense state duration. and a combination of 300 minutes of stop state duration and 20 minutes of discharge state duration.
  • the control unit 520 forcibly closes the switch to supply gas (oxygen) and The supply of gas (oxygen) is continued for the duration of the discharge state. Specifically, when a predetermined period of time has elapsed since the blower operating state changed to a stopped state (exceeding the set stop state duration), the control unit 520 forcibly closes the switch and supplies gas (oxygen). ) is supplied, and the supply of gas (oxygen) is continued for the set discharge state duration time.
  • the control unit 520 opens the switch to stop the supply of gas (oxygen). .
  • gas (oxygen) is supplied to the contact filter bed tank 830. It is possible to prevent the dissolved oxygen content of water from being extremely lowered.
  • the anaerobic microorganisms are transferred to the circulating water (specifically, the circulating water that has flowed into the anaerobic filter bed tank 820 through the contaminant removal tank 810) while the blower is in the discharge state. denitrification by reducing the nitrate ions contained in the Since transfer of circulating water is stopped during the period in which the blower operating state is in the stopped state, the amount of dissolved oxygen in the water in the anaerobic filter bed tank 820 is suppressed from increasing. By alternately transferring and stopping the circulating water in this manner, the anaerobic filter bed tank 820 can stably proceed with anaerobic treatment including denitrification.
  • gas oxygen
  • the anaerobic treatment unit 880 contaminant removal tank 810 and anaerobic filter bed tank 820. do not have. Therefore, an increase in the amount of dissolved oxygen in the water in the anaerobic filter bed tank 820 is suppressed. As a result, the anaerobic filter bed tank 820 can perform anaerobic treatment including denitrification regardless of the operating state of the blower.
  • the blower when the blower is in a stopped state, the amount of dissolved oxygen inside the microbial film in the contact filter tank 830 may decrease, and the progress of aerobic treatment may be suppressed.
  • gas (oxygen) After stopping the supply of gas (oxygen) from the blower 500 to the aerobic treatment unit (contact filter bed tank 830), when a set time elapses, gas (oxygen) is forcibly supplied for a predetermined time.
  • gas (oxygen) is forcibly supplied for a predetermined time.
  • the control unit 520 continuously continues the discharge state, thereby continuously supplying gas (oxygen) to the contact filter bed tank 830 and continuously stirring the water in the contact filter bed tank 830. and the transfer of circulating water is continued continuously.
  • the amount of gas (oxygen) supplied to the contact filter bed tank 830 can be increased, and the stirring time in the contact filter bed tank 830 can be increased.
  • the control unit 520 starts supplying gas (oxygen) to the contact filter bed tank 830 so that dissolved oxygen in the water in the contact filter bed tank 830 Insufficient stirring of the inflow substrate due to insufficient amount and insufficient stirring time can be suppressed.
  • the amount of water flowing into the wastewater treatment apparatus 800 should It is preferable to keep the ratio of the amount of water within a suitable range.
  • a preferred range of the total amount of circulating water transferred per day is, for example, a lower limit and an upper limit arbitrarily selected from 2, 3, 4, 5, 6, and 7 times the daily average amount of wastewater. The range specified in can be adopted. If the daily total amount of circulating water is within the above preferable range, the amount of dissolved oxygen in the water in the anaerobic treatment section 880 increases while suppressing the shortage of the nitrifying liquid supplied to the anaerobic treatment section 880.
  • the daily average amount of wastewater is the average amount of water that flows into the wastewater treatment device 800 in one day.
  • the design value for the average daily sewage volume is 1 m 3 (1000 L)/day in Japan.
  • the preferable range of the total amount of circulating water transferred per day is determined according to the nitrogen removal specifications (for example, the nitrogen removal rate) of the wastewater treatment apparatus. For example, if it is envisaged to remove 80% of the nitrogen contained in the influent, it is preferred that the total volume of circulating water transferred per day is four times the average daily sewage volume.
  • the transfer amount obtained by actually measuring the amount of water flowing out from the discharge port 864 per unit time is within a preferable range.
  • the transfer amount by the circulation air lift pump 860 may vary depending on the height of the water level WL.
  • a preferable range of the transfer amount is determined based on the transfer amount at a water level of a predetermined height (referred to as the reference water level, for example, the low water level LWL), and the transfer amount is adjusted at the reference water level. do it.
  • the control unit 520 of the blower 500 has a function of supplying gas (oxygen) from the gas discharge unit 510 according to the concentration of ammonia in the contact filter bed tank 830, and a function of supplying gas (oxygen) from the gas discharge unit 510.
  • control unit 520 executes water treatment using the gas (oxygen) supplied to the waste water treatment device 800 according to the ammonia concentration measured by the ammonia concentration measuring device 831 installed in the contact filter bed tank 830. can be done. As a result, it is possible to easily realize water treatment suitable for the usage conditions of the wastewater treatment apparatus 800 .
  • the waste water treatment apparatus 800 includes an anaerobic treatment unit 880, a contact filter bed tank 830 that receives water after treatment by the anaerobic treatment unit 880 and performs aerobic treatment, and is disposed in the contact filter bed tank 830.
  • a diffuser 834 that supplies the gas (oxygen) from the contact filter bed tank 830, and a circulation air lift pump 860 that transfers the water treated by the contact filter bed tank 830 to the anaerobic treatment unit 880.
  • the contact filter bed tank 830 uses the gas from the blower 500 to nitrify ammonia
  • the anaerobic treatment unit 880 here, mainly the anaerobic filter bed tank 820
  • uses the water transferred by the circulation air lift pump 860 is used for denitrification.
  • the contact filter bed tank 830 uses oxygen contained in the gas supplied from the blower 500 to perform aerobic treatment including decomposition of organic matter and nitrification of ammonia. can proceed. Further, the contact filter bed tank 830 can stir water in the contact filter bed tank 830 using gas (oxygen) supplied from the blower 500 . Then, the agitation of the water agitates the inflowing substrate (substances to be biologically treated such as organic substances and ammonia) in the contact filter bed tank 830 . This allows the incoming substrate to be dispersed and supplied to the microorganisms in the contact filter bed tank 830 .
  • the anaerobic treatment unit 880 (particularly, the anaerobic filter bed tank 820) can reduce nitrate ions contained in the water transferred by the circulating air lift pump 860 to progress denitrification.
  • the blower 500 is in a stopped state, the transfer of water to the anaerobic treatment section 880 by the circulation air lift pump 860 is stopped.
  • an increase in the amount of dissolved oxygen in the water in the anaerobic treatment section 880 is suppressed, so that the anaerobic treatment section 880 can appropriately proceed with denitrification.
  • the amount of dissolved oxygen in the anaerobic treatment unit 880 can be reduced while the blower 500 is in a stopped state, and the stopped state is repeated, so anaerobic treatment including denitrification can be stabilized.
  • the inflow load increases after the installation of the wastewater treatment device 800
  • the wastewater treatment device 800 is installed in a facility with a large inflow load.
  • the ammonia concentration in the contact filter bed tank 830 is measured, gas is supplied when the concentration exceeds a predetermined concentration (upper limit), and until the ammonia concentration falls below the predetermined concentration (lower limit), Since the supply of gas (oxygen) is continued, the amount of gas (oxygen) supplied to the contact filter bed tank 830 is increased, and the stirring time of the water (and thus the influent substrate) in the contact filter bed tank 830 is increased. can do.
  • the contact filter bed tank 830 can appropriately proceed with decomposition of organic matter (and thus aerobic treatment including nitrification).
  • the anaerobic treatment unit 880 is not provided with an air diffuser. No direct supply of gas containing Therefore, since the amount of dissolved oxygen in the water in the anaerobic treatment section 880 is suppressed from increasing, denitrification can proceed in the anaerobic treatment section 880 (particularly, the anaerobic filter bed tank 820).
  • the upper and lower limits of the ammonia concentration in the contact filter bed tank 830 are set, and the ammonia By controlling the continuous supply of gas (oxygen) from the blower 500 while the concentration is within the numerical range, it is possible to prevent deterioration of water quality when the load is high.
  • the waste water treatment device 800 (FIG. 3) has an air supply pipe 632 connected to a circulation air lift pump 860.
  • This air supply pipe 632 is a pipe that guides gas from the blower 500 to the circulation air lift pump 860 .
  • a circulation valve 630 is connected to the air supply pipe 632 and provided between the air supply pipe 632 and the blower 500 . Therefore, by adjusting the opening of the circulation valve 630, the user can adjust the amount of gas supplied to the circulation air lift pump 860 per unit time, that is, the amount of water transferred by the circulation air lift pump 860 per unit time. Can be easily adjusted.
  • the control unit 520 realizes the gas (oxygen) discharge state and stop state by turning on and off the power supply to the gas discharge unit 510 . Therefore, as the gas discharge unit 510, a device having a special structure for the intermittent mode is not required, and a device with a simple structure that discharges gas (oxygen) when power is supplied can be adopted. . Further, as the control unit 520, a device having a simple configuration including a circuit for turning on/off power supply to the gas discharge unit 510 can be adopted.
  • the gas ejection section 510 performs the same operation of ejecting gas (oxygen) when power is supplied. Therefore, the longer the discharge state, the greater the amount of gas supplied to the contact filter bed tank 830 (that is, the amount of oxygen).
  • the number of types of holding members provided in the aerobic treatment section is not limited to two types, and may be one type or three or more types.
  • a carrier fluidizing tank in which a holding member (also called a carrier) for holding microorganisms flows may be employed.
  • the diffuser 834 is not limited to a pipe with a plurality of holes, and may be any member capable of generating a large number of bubbles (for example, a porous member).
  • the aerobic treatment section is preferably capable of progressing nitrification of ammonia in addition to decomposition of organic matter.
  • the aerobic treatment unit contains a holding material (for example, a contact material) for holding the aerobic microorganisms.
  • concentration of nitrate nitrogen in the influent (also called raw water) flowing into the wastewater treatment apparatus 800 is higher than that of the water treated by the aerobic treatment unit (for example, the water treatment tank on the downstream side of the aerobic treatment unit). If the concentration of nitrate nitrogen in water) is high, it can be said that the aerobic treatment unit is nitrifying.
  • the configuration of the anaerobic treatment unit 880 instead of the configuration including the contaminant removal tank 810 and the anaerobic filter bed tank 820, various other configurations capable of performing anaerobic treatment can be adopted.
  • the contaminant removal tank 810 may also be filled with a filter medium for anaerobic microorganisms to adhere.
  • one water treatment tank instead of the two water treatment tanks 810 and 820, one water treatment tank may be employed (for example, the contaminant removal tank 810 may be omitted).
  • the anaerobic treatment section 880 is preferably capable of progressing denitrification.
  • the anaerobic treatment section 880 contains a holding material (for example, an anaerobic filter medium) for holding anaerobic microorganisms. If the total nitrogen concentration of the water discharged from the waste water treatment device 800 is lower than the total nitrogen concentration in the influent (also called raw water) flowing into the waste water treatment device 800, the anaerobic treatment unit 880 performs denitrification. It can be said that
  • the wastewater treatment method of the present invention is a method of controlling the amount of aeration according to the NH 4 —N (ammonia) measured value by the ammonia concentration measuring device of the contact filter bed tank 830 . Specifically, when the value measured by the ammonia concentration measuring device 831 is larger than the set value of the contact filter bed tank NH 4 —N set to a predetermined value (the ammonia concentration is high), the control unit 520 of the blower 500 Control is performed to start supplying gas (oxygen) to the contact filter bed tank 830 .
  • the controller 520 of the blower 500 controls the contact filter bed. Control is performed to stop the supply of gas (oxygen) to the tank 830 .
  • the amount of aeration can be adjusted according to the concentration of pollutants contained in the sewage, and energy can be saved by suppressing excessive aeration.
  • the gas (oxygen) supply from the blower 500 to the aerobic treatment unit is stopped, the gas is forcibly supplied for a predetermined time after a set time has elapsed. It is preferable to include steps.
  • the ammonia concentration (ammonia concentration upper limit value) at which the gas supply from the blower to the aerobic treatment unit is started, and the ammonia concentration at which the gas supply from the blower to the aerobic treatment unit is stopped It is preferable to control the ammonia concentration so that the difference from (ammonia concentration lower limit) is 0.1 to 2.3 mg/L.
  • Test example 1 A small septic tank manufactured by Fuji Clean Industry Co., Ltd. (trade name: CEN-5 type, W: 1250 mm, L: 2430 mm, H: 1660 mm, total capacity: 2.834 m 3 ) was used as a test tank for examining the control range of ammonia concentration. used. This is , as shown in FIG . It is a septic tank (capacity: 2.834 m 3 ) consisting of a water tank (capacity: 0.237 m 3 ) and a disinfection tank (capacity: 0.015 m 3 ) . As a blower, a blower manufactured by Fuji Clean Industry Co., Ltd. (trade name: EcoMac60) was used.
  • the blower has a discharge rate of 60 L/min and a bore (outer diameter) of 13 mm.
  • an ammonia concentration measuring device an ion-selective electrode type ammoniacal nitrogen measuring device (trade name: S::CAN) manufactured by Ebara Jitsugyo Co., Ltd. was used.
  • Effluent was continuously introduced into the test tank having a total capacity of 2.834 m 3 at a supply rate of 800 L/day.
  • wastewater simulated domestic wastewater (BOD: 200 mg/L, SS: 160 mg/L, TN: 45 mg/L, TP: 5 mg/L) was used.
  • BOD is an abbreviation for Biochemical Oxygen Demand
  • SS is an abbreviation for Suspended Solids
  • TN Total Nitrogen.
  • TP is an abbreviation for Total Phosphorus.
  • the design water quantity means the upper limit of water quantity per day that satisfies the effluent quality standards.
  • Nitrification rate When the ammonia concentration falls below the lower limit, the blower is turned off to stop aeration (aeration off), and when the ammonia concentration rises above the upper limit, the blower is turned on to supply gas (oxygen) to the contact filter bed tank. Supply (aeration on). This operation was repeated until the water quality (ammonia concentration) stabilized (for example, about 4 days to 2 weeks), and the nitrification rate (mg/L ⁇ h) under each condition was determined.
  • the nitrification rate is an index showing the ammonium nitrogen (NH 4 —N) removal rate of aerobic microorganisms responsible for treatment in the contact filter bed tank. The results are shown in Table 2 and FIG.
  • Condition 5 cannot change the aeration-on or aeration-off cycle conditions due to differences in ammonia concentration.
  • Condition 5 is an example in which the ammonia concentration is not controlled by simply repeating the supply of the gas (oxygen) for a certain period of time and then the supply of the gas (oxygen) for a certain period of time.
  • Condition 5 has a blower stop rate of 29%, and it can be said that there is energy saving because there is a time when power is not used.
  • Test example 2 Investigation of duration of stop state and discharge state The amount of water flowing into the septic tank fluctuates even within a day, and when the load is small, it is difficult for water with a high ammonia nitrogen concentration to reach the contact filter bed tank. Become. If this happens, the state of ammonia concentration will continue to be low, and the aeration stop time will be prolonged, resulting in oxygen deficiency, and the activity of aerobic microorganisms will decrease, so the treatment may become unstable. Therefore, after stopping the aeration, when a predetermined time has elapsed, it was investigated to forcibly start the aeration to supply gas (oxygen).
  • oxygen oxygen
  • the amount of wastewater inflow was defined as low load (influent amount: 200 L/day), medium load (influent amount: 500 L/day), and high load (influent amount: 800 L/day).
  • Basic aeration on and aeration off was performed under condition 1 (aeration stopped when ammonia concentration fell below 0.8 mg/L and aeration started when ammonia concentration was higher than 1.1 mg/L) ( Condition 1 above is the same as Condition D in Table 4 below.).
  • Condition 1 above is the same as Condition D in Table 4 below.
  • conditions A, B, or C in Table 4 below are added, and aeration is forcibly started (blower operation (ejection state), and after continuing the aeration for a predetermined time (ejection state duration), the operation of condition 1 is resumed. This cycle was repeated until the water quality stabilized.
  • FIG. 7 shows an operation flow diagram for condition A as an example.
  • condition A aeration is stopped when the ammonia concentration is lower than 0.8 mg/L, and is started when the ammonia concentration is higher than 1.1 mg/L. Then, when 60 minutes have passed since the aeration was stopped, the aeration is forcibly started, and after continuing the aeration for 20 minutes, the aeration is stopped. This cycle is repeated until the water quality stabilizes.
  • Condition D is the same as Condition 1 of Test Example 1. At low load (flow rate: 200 L/day) and medium load (flow rate: 500 L/day), treatment tests were conducted under conditions A to D, and at high load (flow rate: 800 L/day), conditions A and D. A processing test was performed. After the end of the test, similarly to Test Example 1, the operating rate and stop rate of the blower during that period were determined.
  • DO Dissolved oxygen
  • the dissolved oxygen (Dissolved Oxygen; hereinafter sometimes referred to as DO) in the contact filter bed tank was measured, and the ratio of DO exceeding 3 mg/L was determined. If the ratio of DO exceeding 3 mg / L is 50% (50%) or more, the aeration cycle is stable (progresses without problems), and if it is 80% (80%) or more, the aeration cycle is long-term If it is stable and less than 50% (50%), it can be judged that the aeration cycle is unstable.
  • biochemical oxygen demand (BOD), total nitrogen (TN), ammonia nitrogen ( NH4 -N), suspended solids or suspended solids (SS) were also measured.
  • BOD was analyzed using the diaphragm electrode method described in JIS K 0102-21 and JIS K 0102-32.3.
  • Tables 5, 6, 8 and 9 show the results at low load
  • Tables 7, 8, 10 and 11 show the results at medium load
  • Tables 9, 10, 12 and 12 show the results at high load. It is shown in FIG.
  • the ratio of DO exceeds 3 mg / L is high, and if it is 80% (80%) or more, the aeration cycle is assumed to be stable for a long period of time. Considering the stability of the processing performance of the condition A or B, it can be said that the shorter the stop state duration (the time until forced aeration is started), the better.
  • condition A is preferable even at high load.
  • Wastewater treatment system 500 Blower 502 Contact pipe 510 Drive unit 515 Discharge port 520 Control unit 530 Power cable 800 Wastewater treatment device 802 Inflow port 804 Outflow port 810 Contaminant removal tank 820 Anaerobic filter bed tank 830 Contact filter bed tank 831 Ammonia concentration measuring device 834 Aeration Equipment 840 Treatment tank 850 Disinfection tank 900 Wastewater treatment system

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02222785A (ja) * 1989-02-25 1990-09-05 Toto Ltd 曝気量を微調整可能な好気性処理室を具備する浄化槽
JPH0326394A (ja) * 1989-06-23 1991-02-04 Toto Ltd 曝気量を微調整可能な好気性処理室を具備する浄化槽
JPH03262599A (ja) * 1990-03-13 1991-11-22 Kanagawa Pref Gov 汚水中の窒素、リンの浄化方法
JP2002001388A (ja) * 2000-06-15 2002-01-08 National Institute For Rural Engineering 汚水処理装置およびその方法
JP2019136652A (ja) * 2018-02-09 2019-08-22 オルガノ株式会社 水処理方法および水処理装置

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02222785A (ja) * 1989-02-25 1990-09-05 Toto Ltd 曝気量を微調整可能な好気性処理室を具備する浄化槽
JPH0326394A (ja) * 1989-06-23 1991-02-04 Toto Ltd 曝気量を微調整可能な好気性処理室を具備する浄化槽
JPH03262599A (ja) * 1990-03-13 1991-11-22 Kanagawa Pref Gov 汚水中の窒素、リンの浄化方法
JP2002001388A (ja) * 2000-06-15 2002-01-08 National Institute For Rural Engineering 汚水処理装置およびその方法
JP2019136652A (ja) * 2018-02-09 2019-08-22 オルガノ株式会社 水処理方法および水処理装置

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