WO2019117243A1 - 廃水処理用のアナモックス菌群保持用担体ならびにアナモックス菌群付着体、及び該付着体を用いた廃水処理装置 - Google Patents
廃水処理用のアナモックス菌群保持用担体ならびにアナモックス菌群付着体、及び該付着体を用いた廃水処理装置 Download PDFInfo
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- WO2019117243A1 WO2019117243A1 PCT/JP2018/045854 JP2018045854W WO2019117243A1 WO 2019117243 A1 WO2019117243 A1 WO 2019117243A1 JP 2018045854 W JP2018045854 W JP 2018045854W WO 2019117243 A1 WO2019117243 A1 WO 2019117243A1
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- anammox
- waste water
- water treatment
- carrier
- anammox bacteria
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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
- C02F3/30—Aerobic and anaerobic processes
- C02F3/302—Nitrification and denitrification treatment
- C02F3/307—Nitrification and denitrification treatment characterised by direct conversion of nitrite to molecular nitrogen, e.g. by using the Anammox process
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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
- C02F3/10—Packings; Fillings; Grids
- C02F3/105—Characterized by the chemical composition
- C02F3/106—Carbonaceous materials
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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
- C02F3/30—Aerobic and anaerobic processes
- C02F3/302—Nitrification and denitrification treatment
- C02F3/303—Nitrification and denitrification treatment characterised by the nitrification
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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
- C02F3/34—Biological treatment of water, waste water, or sewage characterised by the microorganisms used
-
- 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
- C02F2003/001—Biological treatment of water, waste water, or sewage using granular carriers or supports for the microorganisms
- C02F2003/003—Biological treatment of water, waste water, or sewage using granular carriers or supports for the microorganisms using activated carbon or the like
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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
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/16—Nitrogen compounds, e.g. ammonia
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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
- C02F3/30—Aerobic and anaerobic processes
- C02F3/301—Aerobic and anaerobic treatment in the same reactor
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- 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 carrier for holding anammox bacteria which is used for waste water treatment, an anammox bacteria adhesin, and a waste water treatment apparatus using the adhesin.
- Nitrogen and phosphorus (phosphorus) contained in domestic wastewater, industrial wastewater, and agricultural wastewater are the cause of eutrophication due to retention in the natural closed water area.
- sewage treatment plants existing at about 2200 places in the whole country, about 100 places where nitrogen treatment is sufficiently carried out (refer to the following non-patent document 1).
- Treatment methods of nitrogen contained in waste water include catalytic decomposition method, direct combustion method, hypochlorous acid injection method, biodegradation method and the like, but in particular the cost aspect of decomposition of ammonia nitrogen at 1 to 1000 ppm level In many cases, the biodegradation method is used in consideration of the etc. (Patent Document 1 below).
- This wastewater treatment method by biodegradation is a method in which microorganisms are attached to the immobilized carrier and the microorganisms decompose the organic matter and nitrogen contained in the wastewater, and it may be referred to as nitrification and nitrogen removal (hereinafter referred to as denitrification) It is processed through the process of).
- denitrification nitrification and nitrogen removal
- the nitrogen removal rate 1 kg defined as the amount of ammonia nitrogen generated per unit volume per day is 1 kg -It took about six months to start up to get N / m 3 / day.
- the start-up period at the user site is within one month, so there is a problem that simply using the anammox bacteria group can not meet the needs of the user .
- the present invention has been made in view of the above circumstances, and is a carrier for retaining anammox bacteria that can dramatically shorten the start-up period for obtaining a nitrogen removal rate of 1 kg-N / m 3 / day. It is an object of the present invention to provide an anammox community attached body and a waste water treatment apparatus.
- the present invention is characterized in that carbon particles are used as a carrier of bacteria to achieve the above object.
- FIG. 2 is a schematic view showing a waste water treatment apparatus used in Example 1; The photograph which shows the operating condition of the wastewater treatment apparatus in Example 1.
- 5 is a graph showing the treatment result when the wastewater is treated by the wastewater treatment apparatus of Example 1.
- FIG. Graph showing the relationship between the zeta potential of the carrier and the anammox activity 90 days after the start of the experiment. The graph which shows the relationship between the average particle diameter of a graphite particle, and the anamox activity of the 90th day after an experiment start.
- FIG. 8 is a schematic view showing the apparatus of the present invention used in Example 3. The photograph which shows the operating condition of the wastewater treatment apparatus in Example 3.
- FIG. The schematic diagram which shows the modification of the waste-water-treatment apparatus of this invention. Figure showing the relationship between zeta potential and integrated intensity (number of moving particles) of bacteria adherent (a: Anammox bacteria adherent, b: nitrifying bacteria adherent)
- the carrier for retaining anammox bacteria of the present invention (hereinafter sometimes simply referred to as a carrier) is characterized by containing carbon particles.
- the carrier may be an aggregate of aggregated carbon particles.
- Examples of the carbon particles include particles of graphite, activated carbon, carbon black, carbon nanotubes, fullerenes and the like, and graphite particles which are easy to obtain a particle size suitable for attaching bacteria are desirable.
- Particles made of graphite include artificial graphite particles and natural graphite particles, and artificial graphite particles include isotropic graphite particles and anisotropic graphite particles. From the viewpoint of the strength of the carrier and the adhesion of bacteria due to pores, etc., graphite is preferable, especially isotropic graphite is preferable, and graphite particles have the advantage of being able to be manufactured in large quantities and inexpensively compared to carbon nanotubes and the like.
- the apparent zeta potential (hereinafter simply referred to as zeta potential) of the carrier for holding anammox bacteria group containing the carbon particles is preferably -35 mV or more and 0 mV or less. If the zeta potential of the carrier is regulated to -35 mV or more and 0 mV or less, the Anammox bacteria group is more easily attached to the carrier.
- the above-mentioned zeta potential is more preferably ⁇ 30 mV or more, further preferably ⁇ 20 mV or more.
- the zeta potential of the carrier in the present application refers to the value measured below.
- the average particle diameter of the carbon particles is desirably 2 ⁇ m or more and 1000 ⁇ m or less, preferably 2 ⁇ m or more and 500 ⁇ m or less, and more preferably 8 ⁇ m or more and 200 ⁇ m or less.
- the Anammox bacteria group is more easily attached to the carrier.
- the carbon particles may be fixed by a binder.
- a binder As described above, if the carbon particles are fixed by the binding agent, the strength of the carrier in water can be further improved, and it is possible to prevent the fixed carbon particles from disintegrating in water. More effective.
- the binder include polyvinyl alcohol (PVA).
- the present invention is characterized in that the above-mentioned anammox bacteria adherent is disposed in a wastewater treatment tank.
- the start-up period until the nitrogen removal rate reaches a predetermined value is dramatically shortened, and the anammox bacteria group can treat wastewater smoothly, so treatment It is possible to provide a wastewater treatment device with high capacity.
- Another structure of the present invention is characterized in that the above-mentioned anammox bacteria adherent and a nitrifying bacteria adherent in which nitrifying bacteria are attached to carbon particles are disposed in the same wastewater treatment tank.
- the present constitution which is characterized in that an anammox bacteria group which is anaerobic and a nitrifying bacteria group which is aerobic are caused to act under an appropriate amount of dissolved oxygen, respectively, is referred to as SNAP method.
- SNAP method an anammox bacteria group which is anaerobic and a nitrifying bacteria group which is aerobic are caused to act under an appropriate amount of dissolved oxygen, respectively.
- a waste water treatment unit for treating the waste water by stirring and flowing the above-mentioned anammox bacteria adherents, and a waste storage unit for storing carbon particles from which the anammox bacteria are dropped by losing the anammox activity are separated. It is characterized by If the waste water treatment part and the waste storage part are separated, only the anammox bacteria group-adhering body maintaining an anamox activity will be present in the waste water treatment part. Therefore, the treatment capacity of the waste water treatment apparatus can be further improved.
- a carbon particle supply part which supplies the said waste-water-treatment tank always or intermittently the carbon particle which comprises a support
- a storage tank in which carbon particles are stored may be provided above the waste water treatment unit, and carbon particles may be dropped from the storage tank to the waste water treatment unit constantly or at predetermined intervals. .
- Example 1 a waste water treatment apparatus as shown in FIG. 1 was used.
- the waste water treatment apparatus has the reaction tank 1, and in this reaction tank 1, the waste water treatment unit 4 for treating the waste water and the anammox activity are lost and the anamox bacteria group is dropped.
- a waste storage unit 5 for storing carbon particles (hereinafter, may be referred to as waste).
- waste a waste storage unit 5 for storing carbon particles (hereinafter, may be referred to as waste).
- waste carbon particles
- FIG. 1 6 is a carbon particle (Anammox bacteria group adhesion body) to which the Anamox bacteria group adhered
- 7 is a carbon particle from which the Anamox bacteria group fell off
- 9 is a stirrer.
- the waste water treatment unit 4 and the waste storage unit 5 are separated by the shielding plate 8, and the shielding plate 8 is such that the waste storage unit 5 is tapered as it goes downward. It is arranged inclined.
- the reason for this configuration is as follows.
- a mass 31 of anammox group adherents maintaining the anammox activity is present at the upper side, while the anammox activity disappears at the lower side and the anammox bacterial group
- the carbon particles 30 can be moved from the wastewater treatment unit 4 to the waste storage unit 5 through the lower end opening 8 a formed by the shielding plate 8 by pressing the water surface.
- the average particle diameter of the said graphite particle was measured by the method shown below.
- the average particle size of the carbon particles refers to a value measured by the following method.
- 2 ml of surfactant polyethylene oxide polyoxyethylene (10) octyl phenyl ether
- the beaker of (2) was subjected to ultrasonic treatment for 5 minutes with an ultrasonic washing machine (ASU-10 ultrasonic washing machine ASU-10) (4) Particle size according to carbon measurement conditions using Partica LA-950V2 made by HORIBA The measurement was performed.
- the treatment operation increased the nitrogen load (TN load) by gradually increasing the flow rate and concentration.
- the residence time is 8 to 20 hours, and the test waste water T-N concentration (hereinafter referred to as nitrogen concentration) is operated at 100 to 1300 mg / L.
- Lv Nitrogen load (kg-N / m 3 / day)
- Q Flow rate (L / day)
- V Reactor volume (L)
- the nitrogen removal rate is the T-N nitrogen removal rate. From the start of operation to the eighth day, the nitrogen removal rate remained almost unchanged at 0.08 to 0.10 kg-N / m 3 / day.
- the nitrogen removal rate shown by the following equation (1) was 67.2 to 90.7% from the beginning of the operation, and it was recognized that it was very high.
- ⁇ ((C0 ⁇ C1) / C0) ⁇ 100 (1) ⁇ : Nitrogen removal rate (%) C0: Test wastewater T-N (mg / L) C1: Treated water T-N (mg / L)
- the nitrogen removal rate of nitrogen removal rate in operation 21 day is 0.55kg-N / m 3 / day
- nitrogen removal rate is 26 day 1.06kg-N / m 3 / day
- 32 days Was found to be 1.50 kg-N / m 3 / day.
- the nitrogen removal rate exceeds 1.0 kg-N / m 3 / day on the 26th day, it can be understood that the start-up period can be shortened to one month or less according to the present invention.
- FIG. 9 shows an apparent zeta potential measurement result of the anammox bacteria group adherent.
- the zeta potential measurement was performed by the same method as the apparent zeta potential measurement method of the carrier.
- the value of zeta potential was -26.6 mV. Since the zeta potential of the carrier prior to anammox bacteria attachment was -9.1 mV, it can be seen that the anammox bacteria group is attached to the carrier and the zeta potential is changed.
- Example 2 In the same manner as in Example 1 above, the relationship between the zeta potential of the carrier (the zeta potential without bacteria attached) and the anammox activity 90 days after the start of the experiment was examined. The results are shown in FIG.
- the zeta potential was adjusted by changing the particle size distribution of carbon particles. As apparent from FIG. 4, it was recognized that the zeta potential should be ⁇ 35 to 0 mV, preferably ⁇ 30 to 0 mV, more preferably ⁇ 20 to 0 mV.
- the relationship between the average particle size of the graphite particles (carbon particles) and the anammox activity 90 days after the start of the experiment was examined in the same manner as in Example 1 above, and the results are shown in FIG. As apparent from FIG. 5, it was found that the average particle diameter of the carbon particles is 2 to 1000 ⁇ m, preferably 2 to 500 ⁇ m, more preferably 8 to 200 ⁇ m.
- Graphite particles having an average particle diameter of 20 ⁇ m were bound with PVA to prepare a carrier for holding anammox bacteria group.
- the treatment operation was carried out in the same manner as in Example 1 except that this carrier was filled in the waste water treatment apparatus shown in FIG.
- components having the same functions as those in FIG. 1 are denoted by the same reference numerals.
- reference numeral 15 denotes an anammox bacteria adherent
- reference numeral 17 denotes a separation part.
- anammox bacteria group adhesin As an anammox bacteria group adhesin, the thing after completion
- a carrier As the nitrifying bacteria adherent, a carrier was used which was cultured with synthetic wastewater NH 4 -N 200 mg / L in Table 4 below, and to which nitrifying bacteria were attached. For aeration, a mixed gas of nitrogen / air ratio 1/9 was used, and the dissolved oxygen was adjusted to 1 mg / L or less.
- the nitrogen removal rate stabilized on the 20th day of operation, and a nitrogen removal rate of 50 to 62% was obtained. It is considered that a part of the ammoniacal nitrogen is converted to nitrite nitrogen by the nitrifying bacteria adherent, and the ammoniacal nitrogen and the nitrite nitrogen are converted to nitrogen gas by the anammox bacteria adherent.
- the apparent zeta-potential measurement result of the nitrifying bacteria group adhesion body is shown in FIG.
- the zeta potential measurement was performed by the same method as the apparent zeta potential measurement method of the carrier. The value of zeta potential was -10 mV. Since the zeta potential of the carrier before the nitrifying bacteria group was attached was -30.9 mV, it is understood that the attached bacteria group is attached to the carrier and the zeta potential is changed.
- Example 5 When the operation is performed for a long time in Example 4, a part of the graphite particles may flow out of the system, and the processing speed may be reduced. So, in the present Example 5, regular replenishment of the graphite particle was examined.
- the wastewater treatment apparatus was operated with five series of graphite particles with a yearly replenishment rate of 0.01% by weight, 0.1% by weight, 1% by weight, 2% by weight and 5% by weight.
- the annual replenishment rate of the graphite particles is, for example, replenishment of 11 g of graphite particles per year in a 1.1 L apparatus if replenishment is 1% by weight. Specifically, 11 g of graphite particles were divided into 12 times and replenished 11/12 g each month.
- the other operating conditions are the same as in Example 4.
- the nitrogen removal rate operated for one year is shown in Table 5 below.
- the standard deviation of the removal rate is stable in the case of the samples 2, 3, 4 and 5, and particularly, the standard deviation of the removal rate is extremely stable in the cases of the samples 3, 4, and 5.
- the annual replenishment rate of the graphite particles is preferably 0.1% by weight or more, and particularly preferably 1% by weight or more.
- the addition of the graphite particles is not limited to the case of the SNAP method, and can be applied also to the case where only the anamox bacteria group adherent shown in Example 1 to Example 3 is used.
- the processing operation was carried out in the same manner as in Example 1 using activated carbon (powder activated carbon made by Wako Pure Chemical Industries, product code 037-02115) having an average particle diameter of 5 ⁇ m as a carrier.
- the zeta potential of the carrier was -21.5 mV.
- the nitrogen removal rate was 1.07 kg-N / m 3 / day one month after operation.
- the zeta potential of the anammox bacteria adherent was -24.3 mV.
- the treatment operation was carried out in the same manner as in Example 1 using an anammox bacteria carrier carrying a carrier of PVA alone.
- the nitrogen removal rate was only 0.2 kg-N / m 3 / day three months after operation.
- an anammox bacterial group carrier was prepared in the same manner as in Example 1, and processing operation was performed. At one month after operation, the nitrogen removal rate was only 0.1 kg-N / m 3 / day.
- FIG. 8 a separation tank 20 for separating the carrier and the treated water.
- the separated carrier may be returned to the wastewater treatment tank 1 using the return line 19.
- FIG. 8 the same reference numerals are given to components having the same functions as those in FIGS. 1 and 6.
- 18 is a stirrer for outflow carrier crushing.
- the present invention can be used in a wastewater treatment apparatus using carbon particles to which anammox bacteria are attached.
- Reaction tank 4 Waste water treatment unit 5: Waste storage unit 6: Carbon particles to which Anammox bacteria have adhered (Anammox bacteria adherent) 7: Carbon particles
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Abstract
Description
上記構成であれば、アナモックス菌群がアナモックス菌群保持用担体に付着し易くなるので、窒素除去速度1kg-N/m3/dayを得るための立ち上げ期間を飛躍的に短縮することができる。
担体のゼータ電位が-35mV以上0mV以下に規制されていれば、アナモックス菌群が担体に一層付着し易くなる。
なお、上述のゼータ電位は-30mV以上であることがより好ましく、-20mV以上であることがさらに好ましい。
なお、本願における担体のゼータ電位とは、以下で測定した値を言う。
(1)水50mlに担体1gを加える
(2)薬匙で1分間攪拌後、超音波洗浄機(アズワン製超音波洗浄機ASU-10)を用いて周波数40Hz、出力240Wで5分間攪拌する
(3)攪拌後すぐに、ディップセルに(2)を1ml充填し、ゼータ電位測定装置(Malvern社製Ztasizer Nano-ZS90)を用いて波長633nmの赤色レーザーを用いて測定を実施した。なお、測定時のpHは7である。測定は3回行い、その平均値を担体のゼータ電位とした。
上記炭素粒子の平均粒子径を上記範囲とすることでアナモックス細菌群が担体に一層付着し易くなる。
このように、炭素粒子同士が結着剤により固定されていれば、水中での担体の強度が一層向上し、固定化された炭素粒子の水中での崩壊を防止できるため、上述した作用効果がより発揮される。上記結着材としてはポリビニルアルコール(PVA)が挙げられる。
上記アナモックス菌群付着体を用いると、窒素除去速度が所定値に達するまでの立ち上げ期間が飛躍的に短縮され、また、アナモックス菌群は廃水を円滑に処理することが可能となるので、処理能力に優れた廃水処理装置を提供することが可能となる。
このような構成であれば、硝化細菌によりアンモニア性窒素の一部が亜硝酸性窒素に変換されると共に、アナモックス菌群によりアンモニア性窒素と亜硝酸性窒素から窒素ガスに変換することが可能となる。このように、廃水処理反応の一部を硝化細菌が担うこととなれば、アナモックス反応がより円滑に進行する。
廃水処理部と廃物貯留部とが分離されていれば、廃水処理部にはアナモックス活性を維持しているアナモックス菌群付着体のみが存在することになる。したがって、廃水処理装置の処理能力を一層向上させることができる。
具体的には、廃水処理部の上方に、炭素粒子が貯留された貯留槽を設け、この貯留槽から、常時又は所定期間毎に炭素粒子を廃水処理部に落下させるような構成とすれば良い。
以下、本発明を実施例にて説明するが、本発明は下記実施例に限定されるものではない。
また、本願において炭素粒子の平均粒子径は以下の方法で測定した値を言う。
(1)ビーカーに純水60ccを投入し、黒鉛粒子を5mg投入した
(2)界面活性剤ポリエチレンオキサイド(ポリオキシエチレン(10)オクチルフェニルエーテル)を2ml、(1)のビーカーへ滴下した (3)(2)のビーカーを超音波洗浄機(アズワン製超音波洗浄機ASU-10)で5分間、超音波処理を行った (4)HORIBA製Partica LA-950V2を用い、カーボン測定条件によって粒径測定を実施した。
T-N=[NH4-N]+[NO3-N]+[NO2-N]
である。
窒素負荷Lvの計算は以下の通りである。
Lv=(C×Q)/(V×1000)
Lv:窒素負荷(kg-N/m3/day)
C:供試廃水T-N(mg/L)
Q:流量(L/day)
V:リアクター容積(L)
δ:窒素除去率(%)
C0:供試廃水T-N(mg/L)
C1:処理水T-N(mg/L)
また、18日目に赤褐色のグラニュールと思われる塊が確認でき、さらに発生した窒素ガスが黒鉛粒子に付着し系外へ流出する現象が確認された。加えて、窒素除去速度が極めて優れるといわれている3.0kg-N/m3/dayを、90日程度で達成していることも認められた。なお、図9にアナモックス菌群付着体の見かけのゼータ電位測定結果を示す。ゼータ電位測定は、担体の見かけのゼータ電位測定方法と同様の方法でおこなった。ゼータ電位の値は-26.6mVであった。アナモックス菌付着前の担体のゼータ電位は-9.1mVであったことから、担体にアナモックス菌群が付着してゼータ電位が変化していることが分かる。
また、上記実施例1と同様にして、黒鉛粒子(炭素粒子)の平均粒子径と実験開始後90日目のアナモックス活性との関係について調べたので、その結果を図5に示す。図5から明らかように、炭素粒子の平均粒子径は2~1000μm、好ましくは2~500μm、より好ましくは8~200μmであれば良いことが認められた。
なお、図7において、下方にはアナモックス活性を維持しているアナモックス菌群付着体の塊31が存在する一方、上方にはアナモックス活性を消失したアナモックス菌群付着体の塊30が存在するような構成であり、図2の場合とは、塊30と塊31との上下関係が逆になっている。このようなことを考慮して、分離部7が廃水処理装置の上部に配置されている。
リアクター:1.1L
アナモックス菌群付着体の充填率:5体積%
硝化細菌付着体の充填率:5体積%
制御温度:25℃
曝気量(窒素/空気の比が1/9の混合ガスを使用):1L/min
合成廃水処理(下記表4の合成廃水を40mg/Lに希釈処理)
滞留時間 6~8h
硝化細菌付着体としては、下記表4の合成廃水NH4-N200mg/Lで培養し、硝化細菌を付着させた担体を用いた。曝気には窒素/空気の比1/9の混合ガス使用し、溶存酸素を1mg/L以下になるように調整した。
なお、黒鉛粒子の追加はSNAP法の場合に限定するものではなく、実施例1~実施例3で示したアナモックス菌群付着体のみ用いる場合にも適用しうる。
上記実施例1~実施例6では1槽式の廃水処理装置について説明したが、このような構造に限定するものではなく、図8に示すように、担体と処理水とを分離する分離槽20を設け、返送管路19を用いて分離した担体を廃水処理槽1に戻すような構成としても良い。なお、図8において、図1及び図6と同様の機能を有するものについては同一の番号を付している。また、図8において、18は流出担体破砕用撹拌機である。
4:廃水処理部
5:廃物貯留部
6:アナモックス菌群が付着した炭素粒子(アナモックス菌群付着体)
7:炭素粒子
Claims (8)
- 炭素粒子を含むことを特徴とするアナモックス菌群保持用担体。
- 上記担体の見かけのゼータ電位が-35mV以上0mV以下である、請求項1記載のアナモックス菌群保持用担体。
- 上記炭素粒子の平均粒子径が、2μm以上1000μm以下である、請求項1又は2に記載のアナモックス菌群保持用担体。
- アナモックス菌群が付着されている、請求項1~3のいずれか1項に記載のアナモックス菌群付着体。
- 請求項4記載のアナモックス菌群付着体が廃水処理槽内に配置されていることを特徴とする廃水処理装置。
- 請求項4記載のアナモックス菌群付着体を攪拌流動させて廃水処理する廃水処理部と、アナモックス活性を消失してアナモックス菌群が脱落して生じた炭素粒子を貯留する廃物貯留部とが分離されていることを特徴とする廃水処理装置。
- 請求項4記載のアナモックス菌群付着体と、炭素粒子に硝化細菌が付着された硝化細菌付着体とが、同一の廃水処理槽に配置されていることを特徴とする廃水処理装置。
- 炭素粒子を常時または断続的に供給する炭素粒子供給部を有する、請求項5~7のいずれか1項に記載の廃水処理装置。
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JP2021036781A (ja) * | 2019-08-30 | 2021-03-11 | 学校法人 東洋大学 | 培養方法、培養装置、廃水処理方法及び廃水処理装置 |
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