WO2016148086A1 - Procédé de traitement d'eau et dispositif de traitement d'eau - Google Patents

Procédé de traitement d'eau et dispositif de traitement d'eau Download PDF

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Publication number
WO2016148086A1
WO2016148086A1 PCT/JP2016/057855 JP2016057855W WO2016148086A1 WO 2016148086 A1 WO2016148086 A1 WO 2016148086A1 JP 2016057855 W JP2016057855 W JP 2016057855W WO 2016148086 A1 WO2016148086 A1 WO 2016148086A1
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Prior art keywords
sludge
water
separated
mixing
solid
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PCT/JP2016/057855
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English (en)
Japanese (ja)
Inventor
正英 鈴木
葛　甬生
昌次郎 渡邊
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水ｉｎｇ株式会社
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Priority to JP2017506536A priority Critical patent/JP6749313B2/ja
Publication of WO2016148086A1 publication Critical patent/WO2016148086A1/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
    • C02F11/00—Treatment of sludge; Devices therefor
    • C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
    • 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
    • C02F11/00—Treatment of sludge; Devices therefor
    • C02F11/02—Biological treatment
    • C02F11/04—Anaerobic treatment; Production of methane by such processes
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F11/00—Treatment of sludge; Devices therefor
    • C02F11/10—Treatment of sludge; Devices therefor by pyrolysis
    • 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
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E50/00—Technologies for the production of fuel of non-fossil origin
    • Y02E50/30—Fuel from waste, e.g. synthetic alcohol or diesel

Definitions

  • the present invention relates to a water treatment method and a water treatment apparatus, and particularly to a treatment facility that decomposes and recovers organic matter from organic wastewater by combining biological treatment and sludge energy (fuel) treatment such as anaerobic digestion treatment.
  • the present invention relates to an available water treatment method and a water treatment apparatus.
  • the solid matter in the influent wastewater is first roughened in a first solid-liquid separation tank such as a sedimentation basin, and the treated water is treated in a reaction tank where microorganisms exist.
  • a method is known in which biological treatment is performed while oxygen is supplied, and a mixed liquid containing microorganisms after biological treatment is separated and treated in a second solid-liquid separation tank such as a final sedimentation basin.
  • the organic sludge which is a solid separated in the first and second solid-liquid separation tanks, is methane-fermented in an anaerobic digestion tank and recovered as methane, or dried and carbonized and used as fuel as biomass.
  • the first solid-liquid separation is a method for increasing the amount of methane recovered and the amount of fuel heat by recovering more organic matter from the organic wastewater before the organic wastewater is biologically treated.
  • a preliminary aeration tank is provided in front of the tank, and in some cases, excess sludge is mixed and aerated for about 20 to 30 minutes (for example, see Non-Patent Document 1).
  • this method requires a water tank having a residence time of 20 to 30 minutes as a preliminary aeration tank, and requires an aeration apparatus and power for providing a sufficient dissolved oxygen amount (DO).
  • the first aeration tank requires a water tank having a residence time of about 20 to 30 minutes and a sludge return line.
  • An aeration apparatus and power for providing sufficient DO are required.
  • the present invention provides a water treatment method and a water treatment apparatus capable of highly efficient and stable treatment throughout the apparatus.
  • the present invention completed on the basis of the above knowledge is, in one aspect, mixing organic wastewater as raw water with surplus sludge obtained by biological treatment and hydraulic retention time of 10 minutes or less, and organic wastewater,
  • the liquid mixture of excess sludge is solid-liquid separated to obtain the separated liquid and separated sludge, the separated sludge is converted into fuel, the separated liquid is biologically treated, and the biological treatment generates.
  • a water treatment method is provided that includes returning the sludge as excess sludge.
  • the sludge generated by biological treatment is returned as surplus sludge, and the mixing ratio of surplus sludge to organic wastewater as raw water is 1.5 [kg-sludge. SS / m 3 -raw water] or less and / or 3.0 [kg-SS / kg-raw water CODcr] or less.
  • the water treatment method according to the present invention further includes mixing organic waste water and excess sludge with an oxygen concentration DO of 0.1 mg / L or more.
  • the water treatment method according to the present invention includes mixing organic waste water and excess sludge under anaerobic conditions.
  • the water treatment method according to the present invention includes mixing the organic waste water and the excess sludge after aeration of the excess sludge.
  • converting the separated sludge into fuel includes anaerobically digesting the separated sludge to obtain methane gas and digested sludge, and a part of the digested sludge is obtained. And further supplying the separation liquid into a reaction vessel for biological treatment.
  • a mixing device that mixes organic wastewater as raw water with surplus sludge obtained by biological treatment in a hydraulic retention time of 10 minutes or less, and a mixture of organic wastewater and surplus sludge A solid-liquid separation to obtain a separated liquid and separated sludge, a first solid-liquid separation tank, a fueling device for converting the separated sludge into fuel, a reaction tank for biologically treating the separated liquid, and biological There is provided a water treatment device including return means for returning sludge generated in the treatment as surplus sludge.
  • the mixing apparatus is disposed in the first solid-liquid separation tank.
  • the water treatment apparatus is a mixing apparatus 1 that mixes organic wastewater as raw water with surplus sludge, and adsorbs organic matter in the organic wastewater to the surplus sludge;
  • a first solid-liquid separation tank 2, a reaction tank 3, a second solid-liquid separation tank 4, a fuelizer 6, and a return means 7 are provided.
  • organic wastewater containing organic substances such as sewage, manure, and urine can be used.
  • the quality of influent raw water is 100 to 1000 mg / L biochemical oxygen demand (BOD) and 200 to 3000 mg / L chemical oxygen demand (CODcr).
  • Organic wastewater having a suspended substance (SS) of about 100 to 1000 mg / L is suitably supplied to the water treatment apparatus according to this embodiment.
  • the hydraulic residence time (HRT) of the mixing apparatus 1 is less than 20 minutes, more preferably within 10 minutes, and even more preferably within 5 minutes.
  • the mixing apparatus 1 shown in FIG. 1 is disposed in the first solid-liquid separation tank 2 as shown in FIG. 2, and mixing of organic waste water and excess sludge is organic. It is also preferable to carry out in a solid-liquid separation tank for solid-liquid separation of the mixed liquid of effluent wastewater and excess sludge. Thereby, the water tank for mixing organic waste water and excess sludge can be omitted.
  • the lower limit time of HRT is, for example, preferably 10 seconds or more, more preferably 30 seconds or more.
  • the mixing method used in the mixing device 1 for example, mechanical stirring by a stirring device, aeration method using a diffuser plate using air or the like, an aeration method using an underwater aerator, a method using piping or a water channel, a baffle wall is used.
  • the mixing method that was used is available.
  • the mixing device 1 does not need to be provided with an aeration device for mixing organic waste water and excess sludge in principle, but an aeration device is provided. Therefore, it is preferable to adjust the amount of aeration in the mixing device 1 so that the DO in the mixing device 1 is 0.1 mg / L or more, more preferably 0.2 mg / L or more. Thereby, the excess sludge is activated and the organic matter removing ability is improved, and the discharge of phosphorus from the activated sludge can be suppressed.
  • the mixing apparatus 1 it is also effective to mix organic waste water and excess sludge under anaerobic conditions.
  • an additional device such as an aeration device is not necessary, so that the entire device can be further simplified.
  • an aeration device 8 is provided in the middle of the return means 7, and after the excess sludge is preaerated, the organic waste water and the excess sludge are mixed under anaerobic conditions or aerobic conditions. Good. It is possible to suppress the discharge of phosphorus by aeration of excess sludge in advance with the aeration device 8.
  • 1st solid-liquid separation tank 2 is an apparatus which carries out solid-liquid separation of the liquid mixture obtained with the mixing apparatus 1, for example, a first sedimentation tank etc. are utilized suitably.
  • a first sedimentation tank etc. As means for solid-liquid separation, gravity sedimentation separation, centrifugation, flotation separation, agglomeration separation, membrane separation and the like can be used.
  • an inclined plate or a sludge blanket layer may be used, or a flocculant may be used.
  • the separation liquid obtained in the first solid-liquid separation tank 2 is sent to the reaction tank 3 through a pipe.
  • the separated sludge obtained in the first solid-liquid separation tank 2 is sent to the fuelizer 6 via a pipe.
  • the fueling device 6 is a device for decomposing the separated sludge separated in the first solid-liquid separation tank and converting it into fuel gas or sludge fuel.
  • the fueling device 6 is not particularly limited as long as it is a device installed for the purpose of decomposing the separated sludge and converting it into fuel gas or sludge fuel.
  • an anaerobic digester that generates methane gas by anaerobic digestion of the separated sludge, or a dryer or a carbonizer that dries or carbonizes the separated sludge to produce fuel is also preferably used.
  • an anaerobic digester When an anaerobic digester is used as the fueling device 6, a concentrated sludge having a TS concentration of 1 to 12 wt%, more typically 2 to 8 wt%, more typically 3 to 6 wt% is stored in a hydraulic environment. It is preferable to arrange an anaerobic digester that can be processed within 40 days, more typically within 30 days, and with a methane conversion of 40% or more, more typically 45% or more.
  • the pretreatment device 5 may be disposed in the front stage of the fueling device 6 as necessary. Although the pretreatment device 5 is not specified, a device for reducing the sludge moisture content of the separated sludge from the first solid-liquid separation tank 2 such as a concentrating device or a dewatering device, or a device for improving fuelization such as alkali treatment or ozone treatment May be used alone or in combination.
  • a device for reducing the sludge moisture content of the separated sludge from the first solid-liquid separation tank 2 such as a concentrating device or a dewatering device, or a device for improving fuelization such as alkali treatment or ozone treatment May be used alone or in combination.
  • the reaction tank 3 is an apparatus for performing biological treatment on the separated liquid separated in the first solid-liquid separation tank.
  • biological treatments include activated sludge methods (membrane separation activated sludge method, batch activated sludge method), biofilm treatment methods (fixed bed type biofilm method, fluidized bed type biofilm method) and the like.
  • the reaction tank 3 is an apparatus using a conventional activated sludge method, an anaerobic aerobic method, a circulating nitrification denitrification method, a step inflow multistage nitrification denitrification method, an A2O method, or the like.
  • the reaction tank 3 may be connected to the return means 7 so that the excess sludge generated in the reaction tank 3 can be returned to the mixing device 1 as necessary.
  • the second solid-liquid separation tank 4 is an apparatus for solid-liquid separation of the treated water obtained in the reaction tank 3, and for example, a final sedimentation basin or the like is preferably used.
  • a final sedimentation basin or the like is preferably used.
  • the treated water obtained in the reaction tank 3 is solid-liquid separated into treated water and separated sludge that can be discharged to the outside by sterilization or the like in the second solid-liquid separation tank.
  • a return means 7 for extracting separated sludge is connected to the bottom of the second solid-liquid separation tank 4.
  • a bypass route for sending excess sludge to the sludge fueling device 6 may be provided in preparation for not returning excess sludge to the mixing device 1.
  • the return means 7 is a device for returning the sludge obtained in the second solid-liquid separation tank 4 as surplus sludge to be supplied to the mixing device 1, and is constituted by piping or the like.
  • the amount of surplus sludge supplied to the mixing device 1 via the return means 7 varies depending on the components of the organic waste water. However, when processing general sewage, the surplus sludge is mixed with the organic waste water as raw water.
  • the ratio is 1.5 [kg-sludge SS / m 3 -raw water] or less, more preferably 1.0 [kg-sludge SS / m 3 -raw water] or less, more preferably 0.51 [kg-sludge SS / s m 3 -raw water] It is preferable to return the excess sludge so that the following is satisfied.
  • the mixing ratio of surplus sludge to the organic waste water as raw water is 0.01 [kg-sludge SS / m 3 -raw water] or more, more preferably 0.05 [kg-sludge.
  • SS / m 3 -raw water] is preferably returned so as to be equal to or higher than that.
  • the supply of surplus sludge by the return means 7 may be performed continuously, or the surplus sludge may be sent temporarily only during a time when the sludge load is high.
  • the mixing ratio of excess sludge to organic wastewater as raw water is 0.01 to 0.6 [kg-sludge SS / m 3 -raw water], more preferably 0. It is preferable to add it so that it becomes 0.05 to 0.2 [kg-sludge SS / m 3 -raw water].
  • the mixing ratio of surplus sludge to organic wastewater as raw water is 0.1 to 1.5 [kg-sludge SS / m 3 -raw water] More preferably, it is added so as to be 0.2 to 1.0 [kg-sludge SS / m 3 -raw water].
  • the amount of excess sludge when evaluated by CODcr in the raw water, it is 3.0 [kg-SS / kg-raw water CODcr] or less, more preferably 1.0 [kg-SS / kg-raw water CODcr] or less, More preferably, it is returned to 0.4 [kg-SS / kg-raw water CODcr] or less.
  • the excess sludge amount is evaluated by CODcr in the raw water, the mixing ratio of the excess sludge amount is 0.02 [kg-SS / kg-raw water CODcr] or more, more preferably 0.1 [kg-SS / kg-raw water. CODcr] is preferably returned.
  • the water treatment method which can perform waste water treatment more efficiently by the whole apparatus can be provided by adjusting a mixing ratio to become the said range.
  • the return means 7 is connected to the bottom of the second solid-liquid separation tank 4, but the return means 7 is also connected to the reaction tank 3, and the second means is used to maintain the microorganism concentration in the reaction tank 3.
  • the sludge generated in the solid-liquid separation tank 4 can be returned to the reaction tank 3 as return sludge, and a part of the return sludge can be returned to the mixing apparatus 1 as surplus sludge.
  • sludge may be drawn directly from the reaction tank 3 and supplied to the mixing device 1 as surplus sludge.
  • the return means 7 is connected to the reaction tank 3, the sludge generated in the second solid-liquid separation tank 4 is returned to the reaction tank 3, and the sludge obtained in the reaction tank 3 Is directly returned to the mixing apparatus 1.
  • the ability to remove organic substances from the organic wastewater in the mixing apparatus 1 can be improved.
  • return means 7 return using a centrifugal pump is generally available, but an air lift pump may be used. By using an air lift pump, the power required for return can be reduced, and the entire apparatus can be made more efficient.
  • the water treatment apparatus which concerns on the modification (4th modification) of embodiment of this invention is the digested sludge digested when using an anaerobic digester as the fueling apparatus 6
  • a digested sludge supply means 18 for supplying a part of the reaction tank 3 to the reaction tank 3 may be provided.
  • illustration is omitted, in the case where the aeration apparatus 8 for aeration of excess sludge as shown in FIG. 3 is provided, a part of the digested sludge may be supplied to the aeration apparatus 8.
  • the digested sludge is reactivated and the amount of surplus sludge that contributes to organic matter removal can be increased, so that the efficiency of the entire process can be improved.
  • the amount of digested sludge that is finally aerobically decomposed and partially discharged is reduced, the labor required for digested sludge treatment can be further reduced, and the overall efficiency of the equipment can be reduced. It leads to improvement.
  • a phosphorus recovery device 20 As shown in FIG. 6, as a water treatment device according to still another modification (fifth modification) of the embodiment of the present invention, a phosphorus recovery device 20, a dehydrator 30, and an anaerobic device are disposed downstream of the fuelizer 6.
  • the control apparatus 10 which controls the supply amount of the excess sludge which the reductive ammonia oxidation processing apparatus 40 and the return means 7 return is supplied, and at least one part of the treated water processed with the anaerobic ammonia oxidation processing apparatus 40 is supplied to the mixing apparatus 1. May be.
  • the control device 10 detects, for example, inflow water or sludge concentration (for example, MLSS concentration), supply flow rate, organic matter concentration (for example, CODcr concentration), ammonia nitrogen concentration, etc., disposed in various places in the water treatment device. Possible first detector 11, second detector 12, third detector 13, fourth detector 14, fifth detector 15, sixth detector 16, seventh detector 17 Based on at least one detection result of the eighth detector 18, the control device 10 can adjust the excess sludge supply amount via the excess sludge supply regulator 7a.
  • the control device 10 can adjust the excess sludge supply amount via the excess sludge supply regulator 7a.
  • the control device 10 According to the water treatment apparatus and method shown in FIG. 6, at least a part of the treated water treated by the phosphorus recovery apparatus 20 and the anaerobic ammonia oxidation treatment apparatus 40 is mixed with the mixing apparatus 1, thereby applying to the reaction tank 3. Nitrogen and phosphorus loads are reduced and the quality of treated water is improved.
  • reaction tank 3 various known methods can be applied as long as the separation liquid separated in the first solid-liquid separation tank can be subjected to aerobic biological treatment.
  • a sludge storage tank or a concentration tank (not shown) for storing sludge in the subsequent stage of the reaction tank 3 and supply excess sludge from the sludge storage tank or the concentration tank via the return means 7.
  • the present invention includes various embodiments and the like which are not described herein, and the technical scope of the present invention is determined by the invention specifying matters according to the appropriate claims from the above description. Determined.
  • the sewage is treated with raw water (organic) under the conditions shown in Table 1.
  • Waste water was treated as waste water). That is, the raw water is a sewage with a BOD concentration of 180 mg / L, an SS of 150 mg / L, and the treated water is 600 L / d.
  • the amount of sludge returned from the second solid-liquid separation tank to the reaction tank is 200 L.
  • the treatment was performed as / d.
  • an anaerobic digester was used as the fueling device.
  • surplus sludge is returned so that the mixing ratio of surplus sludge to raw water is 120 [mg-SS / L-raw water] and 0.3 [kg-SS / kg-raw water CODcr] in the case of CODcr concentration standard. did.
  • the amount of methane gas generated was 22% higher in the example than in the comparative example.
  • Table 2 shows the results of the quality of treated water obtained from the second solid-liquid separation tank for the examples and comparative examples.
  • a part of the SS in the organic waste water is adsorbed and aggregated in the activated sludge by mixing the organic waste water (raw water) and the activated sludge for a very short time (5 minutes).
  • the removal rate of BOD and SS in the first solid-liquid separation tank (primary sedimentation) was improved.
  • the BOD load of the separation liquid flowing into the reaction tank is reduced, the amount of aeration air necessary for biological treatment is greatly reduced, and the power can be reduced. .
  • the treated water quality obtained in the reaction tank was also good.
  • organic substances that have been aerobically decomposed in the conventional method can be recovered as solids in the first settling in this embodiment, and can be converted to methane gas in the fueling device, so that the amount of methane gas generated can be increased. It was. That is, according to the water treatment method according to the embodiment of the present invention, it is possible to provide a water treatment method capable of performing wastewater treatment more efficiently in the entire apparatus combining biological treatment and sludge energy conversion treatment. It was.

Abstract

L'invention concerne un procédé de traitement d'eau et un dispositif de traitement d'eau, moyennant quoi il devient possible de traiter de l'eau avec efficacité élevée et de manière sûre lorsque l'on considère le traitement dans l'ensemble du dispositif. L'invention concerne un procédé de traitement d'eau comprenant : le mélange d'eaux usées organiques qui est une eau brute avec une boue en excès obtenue par un traitement biologique pendant un temps de rétention hydraulique de 10 minutes ou moins ; la soumission de la solution mélangée des eaux usées organiques et de la boue en excès à une séparation solide/liquide pour produire une solution séparée et une boue séparée ; la conversion de la boue séparée sous la forme d'un combustible ; la soumission de la solution séparée à un traitement biologique ; et le renvoi de la boue formée par le traitement biologique sous forme de boue en excès.
PCT/JP2016/057855 2015-03-17 2016-03-11 Procédé de traitement d'eau et dispositif de traitement d'eau WO2016148086A1 (fr)

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Cited By (5)

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JP2019034286A (ja) * 2017-08-18 2019-03-07 水ｉｎｇ株式会社 有機性排水の処理装置及び処理方法
JP2019118866A (ja) * 2017-12-28 2019-07-22 株式会社東芝 水処理装置及び水処理方法
JP2019171321A (ja) * 2018-03-29 2019-10-10 高砂熱学工業株式会社 排水処理システム及び排水処理方法
JP2020203265A (ja) * 2019-06-19 2020-12-24 株式会社クボタ 水処理方法及び水処理装置
CN112188996A (zh) * 2018-06-05 2021-01-05 懿华水处理技术有限责任公司 溶解气浮选和固定膜生物反应器解决方案的组合

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JPS56139196A (en) * 1980-04-01 1981-10-30 Ebara Infilco Co Ltd Treatment of sludge in decontamination vessel
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Publication number Priority date Publication date Assignee Title
JP2019034286A (ja) * 2017-08-18 2019-03-07 水ｉｎｇ株式会社 有機性排水の処理装置及び処理方法
JP2019118866A (ja) * 2017-12-28 2019-07-22 株式会社東芝 水処理装置及び水処理方法
JP7169067B2 (ja) 2017-12-28 2022-11-10 株式会社東芝 水処理装置及び水処理方法
JP2019171321A (ja) * 2018-03-29 2019-10-10 高砂熱学工業株式会社 排水処理システム及び排水処理方法
JP7088715B2 (ja) 2018-03-29 2022-06-21 高砂熱学工業株式会社 排水処理システム及び排水処理方法
CN112188996A (zh) * 2018-06-05 2021-01-05 懿华水处理技术有限责任公司 溶解气浮选和固定膜生物反应器解决方案的组合
EP3802434A4 (fr) * 2018-06-05 2022-03-09 Evoqua Water Technologies LLC Combinaison de solutions de flottation à l'air dissous et de bioréacteur à film fixe
US11447408B2 (en) 2018-06-05 2022-09-20 Evoqua Water Technologies Llc Combination of captivator and fixed film bioreactor solutions
JP2020203265A (ja) * 2019-06-19 2020-12-24 株式会社クボタ 水処理方法及び水処理装置
WO2020255516A1 (fr) * 2019-06-19 2020-12-24 株式会社クボタ Procédé de traitement de l'eau et appareil de traitement de l'eau
JP7157009B2 (ja) 2019-06-19 2022-10-19 株式会社クボタ 水処理方法及び水処理装置

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