JP2001170671A - Biological treatment method and device for waste water - Google Patents
Biological treatment method and device for waste waterInfo
- Publication number
- JP2001170671A JP2001170671A JP35564699A JP35564699A JP2001170671A JP 2001170671 A JP2001170671 A JP 2001170671A JP 35564699 A JP35564699 A JP 35564699A JP 35564699 A JP35564699 A JP 35564699A JP 2001170671 A JP2001170671 A JP 2001170671A
- Authority
- JP
- Japan
- Prior art keywords
- microalgae
- tank
- aeration tank
- activated sludge
- wastewater
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000011282 treatment Methods 0.000 title claims abstract description 44
- 238000000034 method Methods 0.000 title claims abstract description 40
- 239000002351 wastewater Substances 0.000 title claims abstract description 20
- 239000010802 sludge Substances 0.000 claims abstract description 46
- 238000005273 aeration Methods 0.000 claims abstract description 39
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims abstract description 28
- 229910002092 carbon dioxide Inorganic materials 0.000 claims abstract description 14
- 239000005416 organic matter Substances 0.000 claims abstract description 10
- 239000001569 carbon dioxide Substances 0.000 claims abstract description 8
- 238000012136 culture method Methods 0.000 claims abstract description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 15
- 238000012258 culturing Methods 0.000 claims description 13
- 230000029553 photosynthesis Effects 0.000 claims description 7
- 238000010672 photosynthesis Methods 0.000 claims description 7
- 241000195493 Cryptophyta Species 0.000 abstract description 5
- 230000003100 immobilizing effect Effects 0.000 abstract 1
- 239000007789 gas Substances 0.000 description 21
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 18
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 9
- 229910052757 nitrogen Inorganic materials 0.000 description 9
- 229910052698 phosphorus Inorganic materials 0.000 description 9
- 239000011574 phosphorus Substances 0.000 description 9
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 7
- 244000005700 microbiome Species 0.000 description 6
- 239000007788 liquid Substances 0.000 description 5
- 239000000126 substance Substances 0.000 description 5
- 238000004065 wastewater treatment Methods 0.000 description 5
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 4
- 239000002609 medium Substances 0.000 description 4
- 229910052760 oxygen Inorganic materials 0.000 description 4
- 239000001301 oxygen Substances 0.000 description 4
- 238000000926 separation method Methods 0.000 description 4
- 239000011785 micronutrient Substances 0.000 description 3
- 235000013369 micronutrients Nutrition 0.000 description 3
- 238000011946 reduction process Methods 0.000 description 3
- 241000195649 Chlorella <Chlorellales> Species 0.000 description 2
- 239000012141 concentrate Substances 0.000 description 2
- 230000018044 dehydration Effects 0.000 description 2
- 238000006297 dehydration reaction Methods 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 239000004575 stone Substances 0.000 description 2
- 230000002195 synergetic effect Effects 0.000 description 2
- 238000010792 warming Methods 0.000 description 2
- 235000016425 Arthrospira platensis Nutrition 0.000 description 1
- 240000002900 Arthrospira platensis Species 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 230000001413 cellular effect Effects 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000012851 eutrophication Methods 0.000 description 1
- 239000001963 growth medium Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 239000011368 organic material Substances 0.000 description 1
- 238000006864 oxidative decomposition reaction Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 229940082787 spirulina Drugs 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
- 238000013022 venting Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12M—APPARATUS FOR ENZYMOLOGY OR MICROBIOLOGY; APPARATUS FOR CULTURING MICROORGANISMS FOR PRODUCING BIOMASS, FOR GROWING CELLS OR FOR OBTAINING FERMENTATION OR METABOLIC PRODUCTS, i.e. BIOREACTORS OR FERMENTERS
- C12M21/00—Bioreactors or fermenters specially adapted for specific uses
- C12M21/02—Photobioreactors
-
- 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
- C02F3/1268—Membrane bioreactor systems
-
- 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
- C02F3/32—Biological treatment of water, waste water, or sewage characterised by the animals or plants used, e.g. algae
- C02F3/322—Biological treatment of water, waste water, or sewage characterised by the animals or plants used, e.g. algae use of algae
-
- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12M—APPARATUS FOR ENZYMOLOGY OR MICROBIOLOGY; APPARATUS FOR CULTURING MICROORGANISMS FOR PRODUCING BIOMASS, FOR GROWING CELLS OR FOR OBTAINING FERMENTATION OR METABOLIC PRODUCTS, i.e. BIOREACTORS OR FERMENTERS
- C12M29/00—Means for introduction, extraction or recirculation of materials, e.g. pumps
- C12M29/18—External loop; Means for reintroduction of fermented biomass or liquid percolate
-
- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12M—APPARATUS FOR ENZYMOLOGY OR MICROBIOLOGY; APPARATUS FOR CULTURING MICROORGANISMS FOR PRODUCING BIOMASS, FOR GROWING CELLS OR FOR OBTAINING FERMENTATION OR METABOLIC PRODUCTS, i.e. BIOREACTORS OR FERMENTERS
- C12M47/00—Means for after-treatment of the produced biomass or of the fermentation or metabolic products, e.g. storage of biomass
- C12M47/02—Separating microorganisms from the culture medium; Concentration of biomass
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2305/00—Use of specific compounds during water treatment
- C02F2305/06—Nutrients for stimulating the growth of microorganisms
-
- 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
-
- 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
- Y02W10/30—Wastewater or sewage treatment systems using renewable energies
- Y02W10/37—Wastewater or sewage treatment systems using renewable energies using solar energy
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Organic Chemistry (AREA)
- Chemical & Material Sciences (AREA)
- Biotechnology (AREA)
- Health & Medical Sciences (AREA)
- Bioinformatics & Cheminformatics (AREA)
- Zoology (AREA)
- Wood Science & Technology (AREA)
- Microbiology (AREA)
- Genetics & Genomics (AREA)
- General Health & Medical Sciences (AREA)
- Sustainable Development (AREA)
- Biochemistry (AREA)
- General Engineering & Computer Science (AREA)
- Biomedical Technology (AREA)
- Biodiversity & Conservation Biology (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Botany (AREA)
- Molecular Biology (AREA)
- Activated Sludge Processes (AREA)
- Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
- Apparatus Associated With Microorganisms And Enzymes (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、排水の生物的処理
技術に関する。さらに詳しくは、活性汚泥法による排水
処理を行い、該活性汚泥法により発生する二酸化炭素
（以下、ＣＯ2 ）を含む排ガス中のＣＯ2 を低減化する
方法及び装置に関する。[0001] The present invention relates to a biological treatment technique for wastewater. More specifically, the present invention relates to a method and an apparatus for performing wastewater treatment by an activated sludge method and reducing CO 2 in exhaust gas containing carbon dioxide (hereinafter, CO 2 ) generated by the activated sludge method.
【０００２】[0002]
【従来の技術】排水中の有機物を生物的に処理する活性
汚泥法は、微生物により有機物を分解するため、処理エ
ネルギーが少ないなどの特徴を有し、下水処理などに広
く用いられている排水の生物的処理方法である。活性汚
泥法に用いられる好気性微生物は有機物を分解して自分
に必要な細胞成分に作り変えるとともに、そのためのエ
ネルギーを得るが、このとき酸素を必要とする。酸素
は、一般にエアレーションタンク（曝気槽）とよばれる
微生物による分解処理を行う槽に空気を通気すること
で、好気性微生物に供給される。供給された酸素は、好
気性微生物による有機物の酸化分解に用いられ、有機物
中の炭素と結合して一部はＣＯ2 に変わる。エアレーシ
ョンタンクからのＣＯ2 を含む排ガスは、そのまま大気
中に放出される。近年、地球温暖化が大きな問題となっ
てきており、ＣＯ2 はその原因物質の一つとされ、大気
への放出を極力抑制する必要に迫られてきている。この
ような現状から、活性汚泥法のエアレーションタンクか
ら放出されるＣＯ2 についても、なんらかのＣＯ2 削減
処理を施すことが重要な課題となっている。2. Description of the Related Art Activated sludge method for biologically treating organic matter in wastewater has characteristics such as low treatment energy because organic matter is decomposed by microorganisms. It is a biological treatment method. The aerobic microorganisms used in the activated sludge method decompose organic substances to make them into cellular components necessary for themselves, and obtain energy therefor, but this time requires oxygen. Oxygen is supplied to aerobic microorganisms by passing air through a tank that is generally called an aeration tank (aeration tank) that performs a decomposition process using microorganisms. Supplied oxygen is used for oxidative decomposition of organic matter by aerobic microorganisms, partially bound to the carbon in the organic material is changed to CO 2. Exhaust gas containing CO 2 from the aeration tank is directly released into the atmosphere. In recent years, global warming has become a major problem, and CO 2 is one of the causative substances, and there is an urgent need to suppress emission to the atmosphere as much as possible. Under these circumstances, for the CO 2 that is released from the aeration tank of the activated sludge process, be subjected to some CO 2 reduction process has become an important issue.
【０００３】[0003]
【発明が解決しようとする課題】現在、活性汚泥法によ
る排水の生物的処理で発生するＣＯ2 については、その
削減処理の研究はなく、従ってＣＯ2 削減処理法も未確
定である。火力発電所等から発生する排ガス中のＣＯ2
の削減処理方法については、物理的に隔離処理する方
法、化学的に処理する方法、生物的に処理する方法など
の研究が行われている。排水処理施設へのＣＯ2 削減処
理の適用については、排水処理設備に加えてあらたにＣ
Ｏ2 を削減するための装置や設備を付加する必要があ
り、しかもその運転にエネルギーを必要とすることか
ら、設備費および運転費が極力小さなものでないと実用
化は困難である。At present, there is no research on the reduction treatment of CO 2 generated by the biological treatment of wastewater by the activated sludge method, and the CO 2 reduction treatment method has not been determined yet. CO 2 in exhaust gas generated from thermal power plants
As for the method of reducing the amount of waste, researches on a method of physically separating, a method of treating chemically, a method of treating biologically, and the like have been conducted. Regarding the application of CO 2 reduction treatment to wastewater treatment facilities, in addition to wastewater treatment facilities,
It is necessary to add a device and equipment for reducing O 2 , and energy is required for the operation. Therefore, it is difficult to put the equipment into practical use unless the equipment cost and operation cost are as small as possible.
【０００４】本発明は、活性汚泥処理で発生するＣＯ2
に対して、生物的なＣＯ2 固定を適用して削減を図り、
前記の問題を解決しようとするものである。生物的なＣ
Ｏ2削減手段は、基本的には光エネルギーを利用した光
合成によるＣＯ2 の固定手段であるので、太陽光を利用
すればＣＯ2 の削減のためのエネルギー費用を小さく抑
えることができる。しかし、生物的なＣＯ2 削減手段
は、光エネルギーを利用するため一般に大きな受光面積
を必要とし、したがって、設備の施設面積が大きいとい
う問題を有している。[0004] The present invention relates to CO 2 generated in activated sludge treatment.
Respect, aims to reduce by applying biological CO 2 fixation,
It is intended to solve the above problem. Biological C
Since the O 2 reducing means is basically a means for fixing CO 2 by photosynthesis using light energy, the use of sunlight can reduce the energy cost for CO 2 reduction. However, biological CO 2 reduction means generally requires a large light receiving area to utilize light energy, and thus has a problem that the facility area of the equipment is large.
【０００５】そこで本発明は、活性汚泥法による排水処
理を行い、該活性汚泥法により発生するＣＯ2 を含む排
ガス中のＣＯ2 を低減化するための生物的ＣＯ2 削減処
理装置を設置するのに必要な面積を極力小さくして、設
置場所の問題を解決するとともに、ＣＯ2 削減処理の運
転費を極力、小さく抑えることができる排水の生物的処
理方法及び装置を提供するものである。Accordingly, the present invention provides a biological CO 2 reduction treatment apparatus for performing wastewater treatment by the activated sludge method and reducing CO 2 in exhaust gas containing CO 2 generated by the activated sludge method. and minimize the area required, thereby solving the location problem, CO 2 reduction process of operating costs as much as possible, is to provide a biological treatment method and apparatus wastewater can be reduced.
【０００６】[0006]
【課題を解決するための手段】上記の問題点を解決する
ために、本発明の排水の生物的処理方法は、排水中の有
機物を生物的に処理する活性汚泥法と、該活性汚泥法で
発生するＣＯ2 を微細藻類の光合成により固定する微細
藻類培養法を組み合わせることを特徴とする。この組み
合わせにより、本発明は、ＣＯ2 削減処理のエネルギー
を抑えるとともに、ＣＯ2 削減処理設備の設置面積を最
小化することを可能にした。In order to solve the above-mentioned problems, a biological treatment method for wastewater of the present invention comprises an activated sludge method for biologically treating organic matter in wastewater, and an activated sludge method. and wherein the combining microalgae culture method for fixing the CO 2 generated by the photosynthesis of the microalgae. This combination, the present invention suppresses the energy of CO 2 reduction process, made it possible to minimize the footprint of the CO 2 reduction processing facilities.
【０００７】このような省エネ及び省スペース効果を達
成することができる本発明の生物的処理装置は、（１）
排水中の有機物を生物的に処理するエアレーションタン
クと、（２）微細藻類培養槽と、（３）該エアレーショ
ンタンクで発生したＣＯ2 を該微細藻類培養槽に通気す
る装置とを備えていることを特徴とする。The biological treatment apparatus according to the present invention, which can achieve such energy saving and space saving effects, comprises (1)
And aeration tank for processing the organic matter in the waste water in biological, (2) and microalgae culture tank, (3) and a venting an apparatus for the aeration tank CO 2 generated in the the fine algae culture tank It is characterized by.
【０００８】本発明の生物的処理装置は、活性汚泥法で
発生するＣＯ2 を含む排ガスを微細藻類培養槽に通気し
て、微細藻類の光合成により該ＣＯ2 を固定し、該排ガ
ス中のＣＯ2 を削減することができる。In the biological treatment apparatus of the present invention, an exhaust gas containing CO 2 generated by the activated sludge method is passed through a microalgae culture tank, and the CO 2 is fixed by photosynthesis of the microalgae. 2 can be reduced.
【０００９】前記本発明の生物的処理装置において、エ
アレーションタンクで生物的に処理された処理水を該微
細藻類培養槽に供給する機構を付加してもよい。In the biological treatment apparatus of the present invention, a mechanism for supplying treated water biologically treated in the aeration tank to the microalgal culture tank may be added.
【００１０】好ましい本発明の生物的処理装置の態様
は、活性汚泥処理設備のエアレーションタンクの上部
に、光合成によるＣＯ2 が固定できる微細藻類の培養液
を収容した微細藻類培養槽を設置した生物的処理装置で
ある。エアレーションタンクの上部は通常、大気解放で
太陽光を遮る構造物もないため、太陽光を利用する微細
藻類培養槽にとって非常に好都合である。さらに、エア
レーションタンクからのＣＯ2 を含む排ガスを微細藻類
培養装置に流入させるためには、該排ガスを集める必要
があり、該微細藻類培養槽でエアレーションタンクの上
部を覆うことで、排ガスが大気に放出されないようにク
ローズドな構造にできるとともに、排気部を設けて、排
ガスを微細藻類培養槽に供給することができる。エアレ
ーションタンクからの排ガスは有害物質を含まずクリー
ンであるため、該排ガスで培養した微細藻類は飼料など
の有用物質として広く利用できる。また、活性汚泥法が
施された処理水を微細藻類培養のための培地として微細
藻類培養槽へ供給して利用することで、運転費の削減と
該処理水の水質改善を図ることができる。A preferred embodiment of the biological treatment apparatus of the present invention is a biological treatment apparatus in which a microalga culture tank containing a culture solution of microalgae capable of fixing CO 2 by photosynthesis is installed above an aeration tank of an activated sludge treatment facility. Processing device. The upper part of the aeration tank is usually very convenient for the microalgae cultivation tank using sunlight, since there is no structure that blocks sunlight when it is opened to the atmosphere. Furthermore, in order to allow the exhaust gas containing CO 2 from the aeration tank to flow into the microalgae culturing apparatus, the exhaust gas needs to be collected. A closed structure can be provided so as not to be released, and an exhaust portion can be provided to supply exhaust gas to the microalgae culture tank. Since the exhaust gas from the aeration tank contains no harmful substances and is clean, microalgae cultured with the exhaust gas can be widely used as useful substances such as feed. Further, by supplying and using the treated water subjected to the activated sludge method as a medium for culturing the microalgae to the microalgae culturing tank, it is possible to reduce the operating cost and improve the quality of the treated water.
【００１１】[0011]
【発明の実施の形態】本発明の実施の態様を図面により
説明する。図１は、本発明による排水の生物的処理方法
の一例を示すフロー図である。図中１は処理すべき排水
である。２は前処理装置で初期沈殿槽などであるが、必
要のない場合もある。３は活性汚泥処理におけるエアレ
ーションタンクでタンク底部に散気装置６が取付けられ
ている。ブロア５により空気４を散気装置６からエアレ
ーションタンク３内に通気供給する。排水中の有機物は
エアレーションタンク３内に存在する微生物群（活性汚
泥）により分解除去される。活性汚泥は沈殿槽又は膜分
離装置等の固液分離装置７に送られて固液分離され活性
汚泥処理水９と濃縮汚泥１０に分けられる。活性汚泥処
理水９は、更に、活性炭吸着処理などの高次処理を施さ
れて河川等に放流される。濃縮汚泥１０の一部は返送汚
泥８としてエアレーションタンク３に戻される。残りの
濃縮汚泥１０は、脱水され焼却などの最終処理が行われ
る。この一連の処理が活性汚泥処理の一例であり、一般
に行われているものである。Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a flowchart showing an example of the biological treatment method for wastewater according to the present invention. In the figure, reference numeral 1 denotes wastewater to be treated. Reference numeral 2 denotes a pretreatment device, such as an initial settling tank, which may not be necessary in some cases. Reference numeral 3 denotes an aeration tank for activated sludge treatment, and a diffuser 6 is attached to the bottom of the tank. The air 4 is ventilated and supplied from the air diffuser 6 into the aeration tank 3 by the blower 5. Organic matter in the wastewater is decomposed and removed by microorganisms (activated sludge) existing in the aeration tank 3. The activated sludge is sent to a solid-liquid separator 7 such as a sedimentation tank or a membrane separator, where it is separated into solid-liquid separated water 9 and concentrated sludge 10. The activated sludge treated water 9 is further subjected to a higher-order treatment such as an activated carbon adsorption treatment and discharged to a river or the like. Part of the concentrated sludge 10 is returned to the aeration tank 3 as return sludge 8. The remaining concentrated sludge 10 is dehydrated and subjected to final treatment such as incineration. This series of treatments is an example of activated sludge treatment and is generally performed.
【００１２】本発明の生物的処理装置では、エアレーシ
ョンタンク３の上部に、微細藻類培養槽１１が設置され
ており、エアレーションタンク３は密閉構造となってい
る。エアレーションタンク３の上部は気相部２３を形成
し、ＣＯ2 を含むエアレーシションタンク排ガス１２が
溜まる。エアレーシションタンク排ガス１２は、エアレ
ーションタンク３の上部に設けられた排ガス取り出し口
１３からブロア１４を経由して微細藻類培養槽１１の底
部に取り付けたら散気装置６によって微細藻類培養槽１
１の培養液部に供給される。In the biological treatment apparatus of the present invention, the microalgae culturing tank 11 is provided above the aeration tank 3, and the aeration tank 3 has a closed structure. The upper part of the aeration tank 3 forms a gas phase part 23 in which the aeration tank exhaust gas 12 containing CO 2 is stored. When the aeration tank exhaust gas 12 is attached to the bottom of the microalgae culture tank 11 via the blower 14 from the exhaust gas outlet 13 provided at the upper part of the aeration tank 3, the microalgae culture tank 1 is diffused by the air diffuser 6.
1 of the culture solution.
【００１３】なお、エアレーションタンク３から排出さ
れるＣＯ2 量は、活性汚泥処理の処理形式によって大き
く異なるが、標準活性汚泥法では単位エアレーションタ
ンク容積あたり、１００〜３００g-ＣＯ2 ／ｍ3 ／ｄ程
度である。微細藻類培養槽１１では、該微細藻類培養槽
１１の上面から太陽光１５を受光し、微細藻類培養槽１
１内の培養液中に存在する微細藻類の光合成によって、
供給されたガス中のＣＯ2 が固定削減される。The amount of CO 2 discharged from the aeration tank 3 varies greatly depending on the treatment type of the activated sludge treatment. However, in the standard activated sludge method, 100 to 300 g-CO 2 / m 3 / d per unit aeration tank volume. It is about. In the microalgae culture tank 11, sunlight 15 is received from the upper surface of the microalgae culture tank 11, and the microalgae culture tank 1
1 by photosynthesis of microalgae present in the culture solution
CO 2 in the supplied gas is fixedly reduced.
【００１４】ＣＯ2 削減量は、微細藻類培養槽１１の単
位受光面積あたり１０〜１００g-ＣＯ2 ／ｍ2 ／ｄ程度
であるが、微細藻類培養槽１１の形式や気候によっても
大きく異なる。仮に、エアレーションタンク３の深さを
２ｍとすると、エアレーションタンク２ｍ3 あたりの微
細藻類培養槽１１の受光面積は１ｍ2 となるので、ＣＯ
2 の削減率は５〜１７％となる。The amount of CO 2 reduction is about 10 to 100 g-CO 2 / m 2 / d per unit light receiving area of the microalgae culturing tank 11, but greatly varies depending on the type and the climate of the microalgae culturing tank 11. Assuming that the depth of the aeration tank 3 is 2 m, the light receiving area of the microalgae culturing tank 11 per 2 m 3 of the aeration tank is 1 m 2.
The reduction rate of 2 is 5 to 17%.
【００１５】微細藻類培養槽１１はオープンポンドのよ
うな大気解放型でも良いし、上部を光透過性の材料で覆
ったクローズド型でもよく、特定の藻類培養装置に限定
されるものではない。クローズド型の場合には、微細藻
類培養槽１１からの排ガス中の酸素濃度が高くなってい
るため、該排ガスをエアレーションタンク３にリサイク
ルすることでエアレーションタンク３の通気量を削減す
る効果も有する。The microalga culturing tank 11 may be of an open air type such as an open pond or a closed type having an upper part covered with a light-permeable material, and is not limited to a specific algal culturing apparatus. In the case of the closed type, since the oxygen concentration in the exhaust gas from the microalgae culture tank 11 is high, recycling the exhaust gas to the aeration tank 3 also has the effect of reducing the amount of ventilation of the aeration tank 3.
【００１６】微細藻類培養槽１１内で培養される微細藻
類としては、クロレラやスピルリナなど既に実用的に生
産されているものを用いれば良いが、特に限定するもの
ではない。微細藻類培養液１６は、分離装置１７で固液
分離され、分離液１９は活性汚泥処理水９に合流され
る。また、微細藻類濃縮液１８は、脱水・乾燥装置２０
で処理され、乾燥藻体（製品）２１となって有効利用さ
れる。The microalgae to be cultured in the microalgae culture tank 11 may be those already practically used, such as chlorella and spirulina, but are not particularly limited. The microalgae culture solution 16 is solid-liquid separated by a separation device 17, and the separation solution 19 is combined with the activated sludge treated water 9. The microalgae concentrate 18 is supplied to a dehydration / drying device 20.
And is effectively used as a dried algal body (product) 21.
【００１７】乾燥藻体２１は、クロレラなどであれば、
そのまま飼料などに有効利用でき、その他の微細藻類も
種々の有効利用が可能であり、処理の経済性にも貢献で
きる。また微細藻類を原料として活性炭を作ることもで
き（特開平８−２６７１３号公報）、この活性炭は排水
処理における高度処理に利用することもできる。If the dried algal body 21 is chlorella or the like,
It can be effectively used as feed as it is, and other microalgae can be used in various ways, which can contribute to economical efficiency of treatment. Activated carbon can also be produced using microalgae as a raw material (JP-A-8-26713), and this activated carbon can be used for advanced treatment in wastewater treatment.
【００１８】微細藻類培養のための培地として、活性汚
泥処理水９を用いることができる。即ち、活性汚泥処理
では、窒素やリンは除去できないが、この窒素やリンは
微細藻類の増殖には必須であるため、これを微細藻類培
養用の培地として利用することができる。窒素、リンは
海や湖沼の富栄養化を引き起こす物質であり、その除去
は大きな課題となっていて、活性汚泥処理後さらに窒
素、リンを除去する処理を行ったり、活性汚泥処理に嫌
気処理を組み合わせて同時処理するなどの改良が行われ
ているが、本発明の排水の生物的処理方法及び装置にお
いては、活性汚泥処理水を微細藻類培養に利用すること
で、処理水中の窒素、リンの濃度を下げることができる
とともに、微細藻類培養のために新たに窒素、リンを加
える必要もなく、一石二鳥の相乗効果がある。さらに、
窒素、リン以外に微量栄養素が必要な場合には微量栄養
源２２を別途、加えてもよい。Activated sludge treated water 9 can be used as a medium for culturing microalgae. That is, nitrogen and phosphorus cannot be removed by the activated sludge treatment, but since nitrogen and phosphorus are essential for the growth of microalgae, they can be used as a culture medium for microalgae. Nitrogen and phosphorus are substances that cause eutrophication of the sea and lakes, and their removal is a major issue.After activated sludge treatment, nitrogen and phosphorus are further removed, or activated sludge treatment is performed anaerobically. Although improvements such as simultaneous treatment in combination have been made, in the biological treatment method and apparatus for wastewater of the present invention, the activated sludge treated water is used for microalgae cultivation, so that nitrogen and phosphorus in the treated water can be reduced. In addition to lowering the concentration, there is no need to add nitrogen or phosphorus newly for microalgal culture, and there is a synergistic effect of two birds with one stone. further,
When micronutrients are required in addition to nitrogen and phosphorus, the micronutrient source 22 may be separately added.
【００１９】[0019]
【発明の効果】本発明による排水の生物的処理方法によ
れば、活性汚泥処理におけるエアレーションタンクから
発生するＣＯ2 を削減でき、地球温暖化防止に貢献でき
る。According to the biological treatment method of wastewater according to the present invention, CO 2 generated from an aeration tank in activated sludge treatment can be reduced, which can contribute to prevention of global warming.
【００２０】ＣＯ2 固定生成物である微細藻類を飼料な
どとして有効利用できる。特に、エアレーションタンク
から発生するＣＯ2 ガスはクリーンであるため、ＣＯ2
固定生成物である微細藻類は安全度の高い飼料とするこ
とができる。Microalgae, which is a CO 2 fixed product, can be effectively used as feed. In particular, since CO 2 gas generated from the aeration tank is clean, CO 2
The microalgae, which is a fixed product, can be used as a highly safe feed.
【００２１】ＣＯ2 削減処理に必要な設備はエアレーシ
ョンタンク上部に設置できるため、新たな敷地を必要と
しない。Since the equipment required for the CO 2 reduction treatment can be installed above the aeration tank, no new site is required.
【００２２】太陽光をエネルギー源とし、微細藻類の培
養のための培地に活性汚泥処理水を利用することができ
るのでＣＯ2 削減に要する消費エネルギー、装置運転費
を小さく抑えることができる。Since the activated sludge water can be used as a medium for culturing microalgae using sunlight as an energy source, energy consumption required for CO 2 reduction and apparatus operation cost can be reduced.
【００２３】活性汚泥処理水を微細藻類培養のための培
地として利用することができ、その場合には新たに窒
素、リンを加える必要もなく培養ができ、且つ活性汚泥
処理水中の窒素、リンの含有量を下げることができ、一
石二鳥の相乗効果がある。The activated sludge-treated water can be used as a medium for culturing microalgae. In this case, the culture can be carried out without adding nitrogen and phosphorus, and the nitrogen and phosphorus in the activated sludge-treated water can be reduced. The content can be reduced and there is a synergistic effect of two birds with one stone.
【図１】本発明による排水の生物的処理方法の一例を示
すフロー図である。FIG. 1 is a flowchart showing an example of a biological treatment method for wastewater according to the present invention.
１ 排水 ２ 前処理装置 ３ エアレーションタンク ４ 空気 ５ ブロア ６ 散気装置 ７ 固液分離装置 ８ 返送汚泥 ９ 活性汚泥処理水 １０ 濃縮汚泥 １１ 微細藻類培養槽 １２ エアレーシションタンク排ガス １３ 排ガス取り出し口 １４ ブロア １５ 太陽光 １６ 微細藻類培養液 １７ 分離装置 １８ 微細藻類濃縮液 １９ 分離液 ２０ 脱水・乾燥装置 ２１ 乾燥藻体 ２２ 微量栄養源 ２３ 気相部 Reference Signs List 1 drainage 2 pretreatment device 3 aeration tank 4 air 5 blower 6 air diffuser 7 solid-liquid separator 8 return sludge 9 activated sludge treated water 10 concentrated sludge 11 microalgae culture tank 12 aeration tank exhaust gas 13 exhaust gas outlet 14 blower 15 Sunlight 16 Microalgae culture solution 17 Separation device 18 Microalgae concentrate 19 Separation liquid 20 Dehydration / drying device 21 Dry alga body 22 Micronutrient source 23 Gas phase
フロントページの続き Ｆターム(参考） 4B029 AA02 BB01 BB02 BB04 BB06 CC01 CC02 CC13 DA03 DA04 DB11 DF05 DF07 DF10 DG06 4D028 BC17 BC18 BD00 BD16 BD17 4D040 DD04 Continued on the front page F term (reference) 4B029 AA02 BB01 BB02 BB04 BB06 CC01 CC02 CC13 DA03 DA04 DB11 DF05 DF07 DF10 DG06 4D028 BC17 BC18 BD00 BD16 BD17 4D040 DD04
Claims (5)
汚泥法と、該活性汚泥法で発生する二酸化炭素を微細藻
類の光合成により固定する微細藻類培養法を組み合わせ
ることを特徴とする排水の生物的処理方法。An activated sludge method for biologically treating organic matter in wastewater and a microalgae culture method for fixing carbon dioxide generated by the activated sludge method by photosynthesis of microalgae. Biological treatment method.
含む排ガスを微細藻類培養槽に通気して、微細藻類の光
合成により該二酸化炭素を固定し、該排ガス中の二酸化
炭素を削減することを特徴とする請求項１に記載の排水
の生物的処理方法。2. An exhaust gas containing carbon dioxide generated by the activated sludge method is passed through a microalgae culture tank to fix the carbon dioxide by photosynthesis of the microalgae and to reduce the carbon dioxide in the exhaust gas. The biological treatment method for wastewater according to claim 1, wherein the wastewater is biologically treated.
細藻類培養のための培地として利用することを特徴とす
る請求項１に記載の排水の生物的処理方法。3. The method according to claim 1, wherein the treated water subjected to the activated sludge method is used as a medium for culturing microalgae.
るエアレーションタンクと、 （２）微細藻類培養槽と、 （３）該エアレーションタンクで発生した二酸化炭素を
該微細藻類培養槽に通気する装置とを備えた生物的処理
装置。4. An aeration tank for biologically treating organic matter in wastewater, a microalgae culture tank, and a carbon dioxide generated in the aeration tank is aerated in the microalgae culture tank. Biological treatment device comprising:
るエアレーションタンクと、 （２）微細藻類培養槽と、 （３）該エアレーションタンクで発生した二酸化炭素を
該微細藻類培養槽に通気する装置と、 （４）該エアレーションタンクで生物的に処理された処
理水を該微細藻類培養槽に供給する機構を備えた生物的
処理装置。5. An aeration tank for biologically treating organic matter in wastewater, (2) a microalgae culture tank, and (3) a carbon dioxide generated in the aeration tank is passed through the microalgae culture tank. And (4) a biological treatment apparatus provided with a mechanism for supplying treated water biologically treated by the aeration tank to the microalgae culture tank.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP35564699A JP2001170671A (en) | 1999-12-15 | 1999-12-15 | Biological treatment method and device for waste water |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP35564699A JP2001170671A (en) | 1999-12-15 | 1999-12-15 | Biological treatment method and device for waste water |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2001170671A true JP2001170671A (en) | 2001-06-26 |
Family
ID=18445048
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP35564699A Pending JP2001170671A (en) | 1999-12-15 | 1999-12-15 | Biological treatment method and device for waste water |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2001170671A (en) |
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