WO2017064982A1 - Procédé de traitement biologique d'eaux usées organiques - Google Patents

Procédé de traitement biologique d'eaux usées organiques Download PDF

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Publication number
WO2017064982A1
WO2017064982A1 PCT/JP2016/077633 JP2016077633W WO2017064982A1 WO 2017064982 A1 WO2017064982 A1 WO 2017064982A1 JP 2016077633 W JP2016077633 W JP 2016077633W WO 2017064982 A1 WO2017064982 A1 WO 2017064982A1
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Prior art keywords
biological treatment
treatment tank
tank
water
organic wastewater
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PCT/JP2016/077633
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English (en)
Japanese (ja)
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繁樹 藤島
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栗田工業株式会社
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Priority to CN201680060402.8A priority Critical patent/CN108137361B/zh
Priority to KR1020187010083A priority patent/KR20180068977A/ko
Publication of WO2017064982A1 publication Critical patent/WO2017064982A1/fr

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    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • 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
    • C02F3/006—Regulation methods for biological treatment
    • 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
    • C02F3/10—Packings; Fillings; Grids
    • 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
    • C02F3/1236—Particular type of activated sludge installations
    • C02F3/1263—Sequencing batch reactors [SBR]
    • 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
    • C02F3/20—Activated sludge processes using diffusers
    • 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 biological treatment method for organic wastewater.
  • a batch activated sludge method is known as a biological treatment method capable of simplifying equipment and operation by omitting a sedimentation tank and a sludge return pipe after the biological treatment tank.
  • the batch activated sludge method uses a series of four steps: raw water input, aeration, standing (precipitation), and discharge of supernatant water (treated water) in one tank, and batches a predetermined number of cycles per day. It is a method of processing by a type operation. That is, more specifically, the following steps are repeatedly performed. Since the aeration tank also serves as the precipitation tank, there is an advantage that the precipitation tank is unnecessary and the structure of the apparatus is simplified. (1) Put raw water into the aeration tank.
  • Patent Document 1 in such a batch activated sludge method, a protozoan for promoting granulation of microbial sludge in an aeration tank in an initial stage of sludge granulation in order to enhance sludge sedimentation, and A method for producing microbial sludge in which filamentous fungus is introduced has been proposed.
  • Patent Document 1 protozoa and filamentous fungi are introduced into an aeration tank for the purpose of promoting sludge granulation and enhancing sedimentation, but even with this method, stable granulation is difficult, Since the sedimentation property of the sludge cannot be sufficiently increased, it takes a long time for the sedimentation process, and the organic waste water cannot be treated efficiently.
  • the present invention uses the first biological treatment tank and the second biological treatment tank provided in two stages in series, and enhances the sedimentation property of sludge in the activated sludge method using at least the second biological treatment tank as a batch type.
  • An object of the present invention is to provide a biological treatment method for organic wastewater that can be efficiently treated.
  • the present inventor has conducted biological treatment with a continuous or batch-type first biological treatment tank that decomposes organic matter with dispersed bacteria, and decomposition of hardly decomposable organic matter. It is divided into a batch-type second biological treatment tank that feeds the dispersible bacteria to the filtration predation type micro-animal, and the second biological treatment tank is introduced while the treated water from the first biological treatment tank is introduced into the second biological treatment tank relatively slowly. It has been found that by performing aeration treatment in a biological treatment tank, sludge with good sedimentation can be reliably generated and efficient treatment can be performed.
  • the gist of the present invention is as follows.
  • the method comprises introducing a first biological treatment water into a second biological treatment tank and precipitating the dispersal bacteria to a micro animal to produce a second biological treatment water.
  • the second biological treatment step is performed in a batch system that repeats a cycle consisting of the following first step to third step.
  • the cycle time is 2 to 6 hours
  • the aeration time t 1 of the first step is 1.2 to 4 times the total time t 2 + t 3 of the second step and the third step
  • the total time t 2 + t 3 of the second step and the third step was 0.5 ⁇ 3h
  • the ratio of the inflow time t 1 ′ of the first biologically treated water in the first step to the aeration time t 1 of the first step t 1 ′ / t 1 is 1/3 to 1 time.
  • 1st process While letting 1st biological treatment water flow into a 2nd biological treatment tank, the inside of a 2nd biological treatment tank is aerated, and the dispersal bacteria contained in the 1st biological treatment water containing a dispersal microbe are preyed on a micro animal.
  • Second step After the first step, aeration is stopped and solid matter containing sludge in the tank is allowed to settle.
  • Third step After the second step, the supernatant water is discharged out of the tank as the second treated water while aeration is stopped.
  • the volume load (COD Cr ) of the first biological treatment tank is 2 to 20 kg-COD Cr / m 3 / d
  • the volume load of soluble organic matter (COD Cr ) of the second biological treatment tank is A biological treatment method for organic waste water, characterized by 0.01 to 0.20 kg-COD Cr / kg-SS / day.
  • a biological treatment method for organic wastewater wherein the dissolved oxygen concentration in the first biological treatment tank is controlled to 1 mg / L or less in [1] or [2].
  • the operation of the first biological treatment tank is performed by an inflow step for inflowing organic waste water, and then the inside of the tank is aerated to make the organic waste water biological by bacteria.
  • a biological treatment method for organic wastewater characterized in that a batch operation having a treatment step is performed.
  • the operation of the first biological treatment tank is performed while aeration is performed while organic wastewater is continuously introduced, or organic wastewater is continuously introduced.
  • a biological treatment method for organic wastewater characterized by performing continuous operation in which aeration is performed and aeration is performed after the inflow of organic wastewater is stopped.
  • First biological treatment tank and second biological treatment tank provided in two stages in series, means for introducing organic waste water into the first biological treatment tank, and biological treatment in the first biological treatment tank Means for introducing the obtained first biological treatment water into the second biological treatment tank, means for discharging the water in the second biological treatment tank, and means for discharging the sludge in the second biological treatment tank.
  • An organic wastewater biological treatment apparatus wherein the first biological treatment tank is a biological treatment tank that converts organic matter into dispersed bacteria by biologically treating organic wastewater introduced into the tank with bacteria;
  • the second biological treatment tank is a biological treatment tank that causes a micro animal to prey on dispersed bacteria in the first biologically treated water containing the dispersed bacteria from the first biological treatment tank.
  • Organic wastewater production comprising control means for performing the operation described in 1. Processing apparatus.
  • the present invention relates to a biological treatment method for organic wastewater that can be used for treatment of organic wastewater in a wide concentration range including domestic wastewater, sewage, food factories and pulp factories.
  • the present invention relates to a biological treatment method for organic wastewater that can improve the treatment efficiency and reduce the amount of excess sludge generation without deteriorating.
  • the first biological treatment tank is obtained by aeration of the inside of the first biological treatment tank, biological treatment of organic wastewater with bacteria, and conversion of organic matter into dispersal bacteria, and the first biological treatment step.
  • the first biological treatment water containing the dispersed bacteria is introduced into the second biological treatment tank, the inside of the second biological treatment tank is aerated, the first biological treatment water is biologically treated, and the dispersal bacteria are preyed on the micro animals.
  • Embodiments of the organic wastewater biological treatment method and biological treatment apparatus of the present invention are described in detail below.
  • a first biological treatment tank 1 and a second biological treatment tank 2 provided in two stages in series are used.
  • organic substances are dispersed by bacteria in a dispersed state.
  • the second biological treatment tank 2 the second biological treatment is performed in which the hardly decomposable organic matter is decomposed and the dispersible bacteria are preyed on by the filtration and predation type micro-animal. Batch operation is performed at least in the second biological treatment tank.
  • 1A and 2A are aeration means such as an air diffuser, and P 1 and P 2 are pumps.
  • “ ⁇ ” represents bubbles due to aeration.
  • a fixed bed may be installed in the first biological treatment tank 1 or the second biological treatment tank 2.
  • the second biological treatment tank in the first biological treatment tank 1, the second biological treatment tank is set such that the upper end of the fixed bed installed is lower than the lower end of the first biological treatment water transfer pipe to the second biological treatment tank 2. 2, it is necessary to design so that the upper end of the installed fixed floor is lower than the lower end of the discharge pipe of the supernatant water.
  • the upper end of each fixed floor is the water depth from the lower end of each pipe. Adjust to a height of about 50-90%.
  • the transfer of the first biological treatment water from the first biological treatment tank 1 may use a pump as shown in FIG. 1, and the biological treatment tank 1, by a pipe 13 with a valve (for example, an electric valve) 13a as shown in FIG. You may carry out using the water level difference between two.
  • a pump as shown in FIG. 1
  • a pipe 13 with a valve for example, an electric valve 13a as shown in FIG. You may carry out using the water level difference between two.
  • the first biological treatment step in the first biological treatment tank 1 is preferably performed as follows.
  • Organic wastewater from raw water is introduced into the first biological treatment tank 1 and aerobic biological treatment is performed by bacteria, and 70% or more, desirably 80% or more, more desirably 90% or more of the organic component (soluble BOD).
  • the first biologically treated water is obtained by oxidative decomposition.
  • the pH of the first biological treatment tank 1 is preferably 6 to 8.5. However, when the raw water contains a large amount of oil, the pH may be 8.0 to 9.0 in order to increase the decomposition rate.
  • the treatment conditions of the first biological treatment tank 1 are as follows: COD Cr volumetric load 2 kg-COD Cr / m 3 / day or more, preferably 2 to 20 kg-COD Cr / m 3 / day, particularly preferably 2 to 15 kg-COD Cr /
  • COD Cr volumetric load 2 kg-COD Cr / m 3 / day or more preferably 2 to 20 kg-COD Cr / m 3 / day, particularly preferably 2 to 15 kg-COD Cr /
  • HRT hydroaulic residence time
  • a part of the sludge from the second biological treatment tank 2 at the subsequent stage may be returned.
  • a carrier may be added to cope with load fluctuations.
  • the carrier may be a fluid bed carrier or a fixed bed carrier as described above.
  • the shape of the carrier to be used is arbitrary, such as a spherical shape, a pellet shape, a hollow cylindrical shape, a thread shape, a plate shape, and the size is about 0.1 to 10 mm. good.
  • the material of the carrier is arbitrary such as a natural material, an inorganic material, or a polymer material, and a gel material may be used.
  • a separation screen for preventing carrier outflow is required at the discharge part of the first biological treatment tank 1.
  • the fixed bed carrier is one in which at least a part of the carrier is fixed to any one of the bottom, side, and top of the first biological treatment tank 1.
  • the shape of the carrier is arbitrary such as a thread, plate, strip, etc.
  • the material is also a natural material, an inorganic material, a polymer material, etc. It may be used. Desirably, it is a porous polyurethane foam, for example, a strip or sheet of length 50 to 400 cm ⁇ width 5 to 200 cm ⁇ 0.5 to 5 cm in the depth direction of the second biological treatment tank 1 is preferable.
  • the carrier filling rate (the volume fraction of the carrier with respect to the tank volume) is preferably 20% or less, preferably 5% or less. By reducing the carrier filling rate in this way, it is not affected by changes in concentration, Dispersed bacteria that are easy to prey can be generated.
  • the dissolved oxygen (DO) concentration in the first biological treatment tank 1 is preferably controlled to 1 mg / L or less, particularly 0.5 mg / L or less, for example 0.05 to 0.5 mg / L. While the growth of the bacteria is suppressed, dispersal bacteria having a size of about 1 to 5 ⁇ m dominate, and these are rapidly preyed in the second biological treatment tank 2. In order to maintain the above dissolved oxygen concentration, control such as adjusting the aeration output or intermittent aeration is performed.
  • the first biological treatment tank may be a batch type or a continuous type.
  • the treatment time varies depending on the degradability of the raw water, but it is desirable that the treatment time be 30 minutes or more and 21 hours or less.
  • 1 ⁇ 2 to 7/8 of the tank volume is transferred to the second biological treatment tank 2 as the first biological treatment water, and the raw water is introduced into the reduced volume to proceed with the next cycle.
  • the transfer amount of the first biological treated water is too small, the processing efficiency is lowered.
  • the bacterial cells in the tank are also discharged, resulting in a reduction in the decomposition efficiency of the organic components.
  • the time for receiving raw water and the time for transferring the first biological treatment water to the second biological treatment tank 2 are adjusted according to the cycle of the second biological treatment tank 2.
  • the first biological treatment tank 1 is a batch type
  • aeration is stopped or the output is reduced during the waiting time from the introduction of raw water, the discharge of the first biological treatment water, and the end of the discharge until the start of the introduction of the next raw water. Also good.
  • the aeration power can be reduced.
  • the operation can be simplified and the raw water is introduced and / or the first biological treatment water is discharged.
  • Biological treatment can also be performed during the waiting time until the start of the next raw water introduction, and the treatment efficiency can be increased.
  • the raw water tank may be omitted by combining the first biological treatment tank with the raw water tank.
  • the first biological treatment tank 1 When the first biological treatment tank 1 is made continuous, that is, when the raw water inflow is made continuous (but stops when there is no raw water itself), the first biological tank treated water is transferred to the second biological treatment tank. As mentioned above, it is desirable to carry out with a pump or an electric valve. When transferring by a pump, since the transfer pump is stopped when the aeration of the second biological treatment tank is stopped, the transfer amount is taken into consideration. Since the water level of the first biological treatment tank 1 rises while the transfer pump is stopped, it is necessary to set the tank volume in consideration of such water level rise.
  • the second biological treatment step in the second biological treatment tank 2 is preferably performed as follows.
  • the first biological treatment water from the first biological treatment tank 1 is introduced into the second biological treatment tank, where surplus sludge is produced by oxidative decomposition of remaining organic components, self-degradation of dispersible bacteria, and predation by micro animals. Reduce weight.
  • the second biological treatment tank 2 in order to utilize the action of a micro animal having a slower growth rate than bacteria and the self-degradation of the bacteria, an operation condition and a treatment apparatus are adopted so that the micro animal and the bacteria stay in the system. For example, by providing a fixed bed carrier in the second biological treatment tank 2, the amount of micro-animal retained in the tank can be increased.
  • the fixed bed carrier is one in which at least a part of the carrier is fixed to any one of the bottom, side, and top of the second biological treatment tank 2.
  • the shape of the carrier is arbitrary such as a thread shape, a plate shape, a strip shape, and the material may be a natural material, an inorganic material, a polymer material, etc., and a gel material may be used. Desirably, it is a porous polyurethane foam, for example, a strip or sheet having a length of 100 to 400 cm ⁇ width of 5 to 200 cm ⁇ 0.5 to 5 cm in the depth direction of the second biological treatment tank 2 is preferable.
  • the filling rate of the carrier is preferably 0.1% or more, for example, 0.2 to 5%.
  • the carrier is preferably such that the longitudinal direction of the sheet or strip is in the depth direction of the second biological treatment tank 2, the plate surface of the sheet or strip is in the vertical direction, and 2
  • the sheet surface direction of the sheet-shaped or strip-shaped carrier intersects (preferably orthogonally) with the flow of water flowing into the biological treatment tank 2 and flowing out of the second biological treatment tank 2. ) In the second biological treatment tank 2 so as to be in the direction.
  • a plurality of pieces with fasteners attached to the upper and lower surfaces of the carrier are prepared, and these are prepared in the depth direction of the second biological treatment tank 2 and / or Alternatively, a predetermined number of sheets are arranged in parallel in the width direction, and a fastener with a carrier attached to a frame material made of SUS or the like is fixed to form a unit, and a plurality of carrier units may be provided as necessary. Good.
  • the second biological treatment tank 2 has a pH of 7 or less, for example, a pH of 5.5 to 6.5.
  • the DO concentration in the second biological treatment tank 2 is preferably about 1 to 4 mg / L.
  • the sludge in the tank is adjusted so that the SRT (sludge retention time) is 30 days or less, preferably 10 to 25 days, more preferably 10 to 20 days, in combination with the outflow of the treated water SS. It is desirable to pull it out. At the time of calculation of SRT at this time, the sludge for carrier adhesion is not included.
  • the SRT range is desirably 10 to 30 days.
  • the sludge load due to the soluble BOD in the second biological treatment tank 2 is 0.01 kg-BOD / kg-MLSS / day or more, preferably 0.01 to 0.1 kg-BOD / kg-MLSS / day, more preferably Is preferably 0.02 to 0.05 kg-BOD / kg-MLSS / day.
  • the dissolved organic matter load (COD Cr load) of the second biological treatment tank 2 is 0.01 kg-COD Cr / m 3 / day or more, particularly 0.01 to 0.2 kg-COD Cr / m 3 / day, more preferably It is preferably 0.03 to 0.15 kg-COD Cr / m 3 / day. For this reason, you may make it supply a part of raw
  • the MLSS at this time includes MLSS for the carrier adhering.
  • the batch operation in the second biological treatment tank 2 is performed with aeration and inflow of the first biological treated water (first step), stationary sedimentation by stopping aeration (second step), and aeration stopped.
  • Water discharge (3rd process) is made into 1 cycle, and this is repeated.
  • the first biological treatment tank treated water inflow needs to be during aeration.
  • the start of aeration and the start of inflow of the first biological treatment water may be simultaneous.
  • the inflow time t 1 ′ of the first biological treatment tank treatment water is preferably 1/3 to 1 time and more preferably 1/2 to 1 time the second biological treatment tank aeration time t 1 .
  • the inflow time t 1 ′ of the first biological treatment water into the second biological treatment tank 2 is 1/3 to 1 times the aeration time t 1 of the second biological treatment tank 2.
  • the cycle time (t 1 + t 2 + t 3 in FIG. 5) is 2 to 12 hours, preferably 2 to 6 hours (more preferably 2 to 5 hours), and the aeration stop time t 2 + t 3 (second step + second step) (3 steps) is 30 minutes or more, preferably 45 minutes or more. If it deviates from these conditions, the sedimentation property of sludge is not improved and SS leaks into the treated water. Sludge is solid-liquid separated with an aeration stop time of about 5 to 15 minutes (stationary settling time in anaerobic state), but in order to form sludge with high sedimentation, it is further settling in anaerobic state. It is effective to continue the aeration, and by setting the aeration stop time t 2 + t 3 to 30 minutes or more (preferably 45 minutes or more and 180 minutes or less), the sedimentation property of the separated sludge can be improved.
  • aeration time / aeration stop time ratio (t 1 / (t 2 + t 3 )) of the second biological treatment tank 2 By setting the aeration time / aeration stop time ratio (t 1 / (t 2 + t 3 )) of the second biological treatment tank 2 to 1.2 to 4.0, preferably 2.5 to 4.0, The organic matter / SS removal ability can be maintained.
  • the ratio of aeration time / aeration stop time (t 1 / (t 2 + t 3 )) may be less than 1.2 when the load is lower than expected or at startup.
  • the discharge time is preferably 15 to 120 minutes. In addition, you may start discharge
  • the method for discharging treated water is arbitrary.
  • suction positions which are alternately opened sequentially at the sludge interface position and time difference (Fig. 1)
  • float-type discharge device Fig. 3
  • valves are opened sequentially at the sludge interface position and time difference ( Any system such as FIG. 4) may be adopted.
  • the float 14 having a water intake floats on the surface of the water, and the treated water is discharged from the bellows type pipe 15 through the normal pipe 16.
  • pipes 17, 18, and 19 are connected to the side surface of the tank 2 at different heights, and treated water is discharged from the pipes 17, 18, and 19 by opening the valves 17 a, 18 a, and 19 a. Is done.
  • a sedimentation agent may be added only when the sedimentation property of sludge is poor, such as at the time of start-up or when the activity is reduced due to the inflow of toxic substances.
  • the precipitating agent is optional, such as an iron-based or aluminum-based inorganic flocculant or an inorganic substance serving as a weight (calcium, iron, etc.).
  • a cationic, anionic, amphoteric polymer flocculant You may add 1 type, or 2 or more types.
  • the second biological treatment tank 2 is preferably 1 to 10 times the effective volume of the first biological treatment tank 1 and preferably 1 to 3 times the effective volume of the first biological treatment tank 1 in order to perform the treatment under the above preferred conditions. It is more preferable.
  • the second biological treatment water from the second biological treatment tank 2 may be subjected to post-treatment such as coagulation solid-liquid separation, membrane separation, and filtration.
  • aeration is performed in both the first biological treatment tank and the second biological treatment tank from the beginning of the cycle.
  • raw water is introduced into the first biological treatment tank and the biological treatment reaction proceeds.
  • the first biological treatment water is transferred from the first biological treatment tank to the second biological treatment tank, and the biological treatment reaction is performed in the second biological treatment tank by receiving the first biological treatment water.
  • the above operation is performed by piping for introducing raw water into the first biological treatment tank 1, piping for transferring the first biological treatment water from the first biological treatment tank 1 to the second biological treatment tank 2, and upward from the second biological treatment tank 2.
  • the switching of the valves provided in the pipe for discharging the clear water or the operation of the pump is controlled in conjunction with the water level sensor provided in each tank, and the aeration means of the first biological treatment tank 1 and the second biological treatment tank 2 are controlled. It can be performed by automatic operation by the control means for controlling the ON / OFF operation of the aeration means.
  • Example 1 Biological treatment of raw water of COD Cr 2100 mg / L and BOD 1200 mg / L was performed using the biological treatment apparatus shown in FIG.
  • the specifications and processing conditions of the first biological treatment tank 1 and the second biological treatment tank 2 were as follows.
  • COD Cr volume loading of the entire device is 3.68kg-COD Cr / m 3 /day(2.1kg-BOD/m 3 / day).
  • the raw water was continuously flowed into the first biological treatment tank 1 at 70 L / day (2.92 L / h), and constantly aerated.
  • the treated water was transferred from the first biological treatment tank 1 to the second biological treatment tank 2 in a cycle of 3.89 L / h ⁇ 2.25 h outflow and 0.75 h outflow stop.
  • the amount of water in the first biological treatment tank 1 fluctuated between 7.8 L and 10 L (water level increased and decreased).
  • the treatment water was introduced from the first biological treatment tank at 2.89h at 3.89L as described above at the same time as aeration was started (total 8.75L).
  • the first discharge valve 17a was opened after 10 minutes
  • the second discharge valve 18a was opened after 20 minutes
  • the third discharge valve 19a was opened after 30 minutes, and each treated water was taken out.
  • the amount of sludge withdrawn from the second biological treatment tank 2 was 2 L / d (SRT 15 day).
  • sludge having a very good solid-liquid separation property is generated in the second biological treatment tank 2, and the SS of the treated water (supernatant water of the second biological treatment tank 2) is 50 mg / L or less, and is extracted from the treated water SS.
  • the sludge conversion rate combined with the sludge amount was 0.1 kg-SS / kg-COD Cr .
  • Example 2 One sheet of carrier made of polyurethane (50 ⁇ 9.6 ⁇ 0.5 cm) was placed in the second biological treatment tank 2 (carrier filling rate 0.8%), and the longitudinal direction of the sheet was set up and down. Except for this, the raw water was treated under the same conditions as in Example 1. The upper end of the fixed bed carrier was set to be 80% of the water depth from the lower end of the lowest pipe 19.
  • sludge having a very good solid-liquid separation property is generated in the second biological treatment tank 2, and the SS of the treated water (supernatant water of the second biological treatment tank 2) is 40 mg / L or less, and is extracted from the treated water SS.
  • the sludge conversion rate including the sludge was 0.06 kg-SS / kg-COD Cr .
  • Example 2 The raw water was treated in the same manner as in Example 1 except that the amount of sludge withdrawn from the second biological treatment tank 2 was 1.36 L / d (SRT 22 day).

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Abstract

La présente invention vise à améliorer les propriétés de dépôt de boue et réaliser un traitement efficace. Une première eau traitée biologiquement est générée par des eaux usées organiques introduites dans une première cuve et traitées par voie aérobie et biologiquement à l'aide de bactéries dispersées, de telle sorte que la matière organique est convertie en bactéries dispersées, et la première eau traitée biologiquement est introduite dans une seconde cuve de telle sorte que les bactéries dispersées sont nourries par des micro-organismes. Un cycle d'une deuxième étape de traitement biologique (première à troisième étapes ci-dessous) nécessite 2 à 6 heures. Le temps d'aération dans la première étape est 1,2 à 4 fois plus long que le temps total pour les deuxième et troisième étapes. Le temps total pour les deuxième et troisième étapes est de 0,5 à 3 heures. Le temps d'entrée pour la première eau traitée biologiquement dans la première étape est 1/3 à 1 fois le temps d'aération dans la première étape. Première étape : la première eau traitée biologiquement s'écoule dans une seconde cuve de traitement biologique, l'intérieur de la seconde cuve de traitement biologique est amené à adopter un état aéré, et les bactéries dispersées comprises dans la première eau traitée biologiquement comprenant les bactéries dispersées sont nourries par les micro-organismes. Deuxième étape : l'aération est arrêtée et la boue peut se déposer. Troisième étape : l'eau de surnageant est évacuée de la cuve sous forme de seconde eau traitée.
PCT/JP2016/077633 2015-10-16 2016-09-20 Procédé de traitement biologique d'eaux usées organiques WO2017064982A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN201680060402.8A CN108137361B (zh) 2015-10-16 2016-09-20 有机性排水的生物处理方法
KR1020187010083A KR20180068977A (ko) 2015-10-16 2016-09-20 유기성 배수의 생물 처리 방법

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Application Number Priority Date Filing Date Title
JP2015204752A JP6202069B2 (ja) 2015-10-16 2015-10-16 有機性排水の生物処理方法
JP2015-204752 2015-10-16

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WO2017064982A1 true WO2017064982A1 (fr) 2017-04-20

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