JP5930798B2 - Organic wastewater treatment method and apparatus - Google Patents
Organic wastewater treatment method and apparatus Download PDFInfo
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- 238000004065 wastewater treatment Methods 0.000 title claims description 18
- 239000002351 wastewater Substances 0.000 claims description 97
- 238000009280 upflow anaerobic sludge blanket technology Methods 0.000 claims description 52
- 238000006243 chemical reaction Methods 0.000 claims description 49
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 46
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims description 30
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 22
- 239000001301 oxygen Substances 0.000 claims description 22
- 229910052760 oxygen Inorganic materials 0.000 claims description 22
- 238000000855 fermentation Methods 0.000 claims description 17
- 230000004151 fermentation Effects 0.000 claims description 17
- 239000001569 carbon dioxide Substances 0.000 claims description 15
- 229910002092 carbon dioxide Inorganic materials 0.000 claims description 15
- 238000000034 method Methods 0.000 claims description 13
- WSFSSNUMVMOOMR-NJFSPNSNSA-N methanone Chemical compound O=[14CH2] WSFSSNUMVMOOMR-NJFSPNSNSA-N 0.000 claims description 6
- 238000012545 processing Methods 0.000 claims description 5
- 238000011144 upstream manufacturing Methods 0.000 claims description 4
- 238000002156 mixing Methods 0.000 claims description 3
- 238000007599 discharging Methods 0.000 claims description 2
- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 description 57
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 25
- 239000010802 sludge Substances 0.000 description 12
- 241001148471 unidentified anaerobic bacterium Species 0.000 description 9
- 239000007789 gas Substances 0.000 description 7
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 6
- 239000005416 organic matter Substances 0.000 description 6
- 239000010815 organic waste Substances 0.000 description 6
- 238000012360 testing method Methods 0.000 description 5
- 230000008569 process Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 239000008187 granular material Substances 0.000 description 3
- 238000000926 separation method Methods 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 2
- 238000000354 decomposition reaction Methods 0.000 description 2
- 244000005700 microbiome Species 0.000 description 2
- 238000000746 purification Methods 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 241000894006 Bacteria Species 0.000 description 1
- 238000005273 aeration Methods 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000007872 degassing Methods 0.000 description 1
- 238000007865 diluting Methods 0.000 description 1
- 238000010790 dilution Methods 0.000 description 1
- 239000012895 dilution Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000010812 mixed waste Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000007781 pre-processing Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000006228 supernatant Substances 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 238000009279 wet oxidation reaction Methods 0.000 description 1
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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
- 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
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- Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
Description
本発明は、溶存酸素およびホルムアルデヒドを含有する有機排水の処理方法に関する。 The present invention relates to a method for treating organic waste water containing dissolved oxygen and formaldehyde.
工場排水の中には、ホルムアルデヒドやメタノールなどが含まれる場合がある。このような排水は、ホルムアルデヒド濃度が廃水基準に適合するように処理されてから排出される。この排水中のホルムアルデヒドやメタノールに対する処理方法として、活性汚泥法が多く利用されている。 Factory effluent may contain formaldehyde or methanol. Such waste water is discharged after being treated so that the formaldehyde concentration meets waste water standards. The activated sludge method is often used as a treatment method for formaldehyde and methanol in the waste water.
活性汚泥法では、本来生物にとって有害物質であるホルムアルデヒドを微生物によって処理するために、ホルムアルデヒド濃度を徐々に高くして微生物のホルムアルデヒドに対する耐性を獲得させつつホルムアルデヒドを分解させる「馴養」という段階を経る。そのため、実際の排水を処理できるようになるまでに長期を要していた。 In the activated sludge process, in order to treat formaldehyde, which is originally a harmful substance for organisms, with microorganisms, a process of “acclimation” is performed in which formaldehyde is decomposed while gradually increasing the formaldehyde concentration to acquire the resistance of microorganisms to formaldehyde. For this reason, it took a long time before the actual wastewater could be treated.
そこで、活性汚泥を用いずにホルムアルデヒドを分解処理する方法が検討されている。たとえば、特許文献1および2には活性汚泥法と異なり、湿式酸化によりホルムアルデヒドを酸化除去するものであるが、排水を昇温・昇圧する設備、および触媒を設置する必要があり、排水処理のための大掛かりな設備が別途必要になるという問題があった。 Therefore, a method for decomposing formaldehyde without using activated sludge has been studied. For example, Patent Documents 1 and 2 differ from the activated sludge method in that formaldehyde is oxidized and removed by wet oxidation, but it is necessary to install equipment for raising and raising the temperature of wastewater and a catalyst, and for wastewater treatment. There is a problem that a large-scale facility is required separately.
また、このような排水中に高濃度の有機物を含んでいる場合、活性汚泥法などの好気処理を行うと生物の活性があがりにくいという問題のほかに、曝気のために必要なエネルギコストが嵩むこと、余剰汚泥が大量に発生するため汚泥処理コストが嵩むことなども現実的な問題がある。 In addition, when such wastewater contains high-concentration organic matter, the aerobic treatment such as the activated sludge method makes it difficult to increase the activity of living organisms, and the energy cost required for aeration There are also practical problems such as an increase in the amount of sludge generated due to a large amount of excess sludge.
そこで、このような排水を嫌気処理にてメタン発酵させ、発生する汚泥の減少および生成するメタンガスの再利用を図ることでエネルギコストを低減し、さらに、嫌気性菌であれば、ホルムアルデヒドを分解することができるという事情もあって、嫌気処理したいという要望がある。 Therefore, such wastewater is subjected to methane fermentation by anaerobic treatment to reduce energy costs by reducing the generated sludge and reusing the generated methane gas. Furthermore, if anaerobic bacteria are used, formaldehyde is decomposed. There is a demand for an anaerobic treatment because of the circumstances.
しかし、このような排水には、高濃度の溶存酸素が含まれている場合が多く、きわめて酸素過剰な環境下では、メタン発酵を行う嫌気性菌がほとんど増殖しないために、嫌気処理を行うためには、排水を希釈して処理せざるを得ない。そのため、結局のところ大量の処理水を処理しなくてはならなくなり、処理効率の向上にはつながらず、嫌気処理を行っても所期の目的を達成できないという問題があった。 However, such wastewater often contains a high concentration of dissolved oxygen, and in an extremely oxygen-rich environment, anaerobic bacteria that perform methane fermentation hardly grow, so anaerobic treatment is performed. In some cases, wastewater must be diluted and treated. Therefore, after all, a large amount of treated water has to be treated, which does not lead to an improvement in treatment efficiency, and the intended purpose cannot be achieved even if anaerobic treatment is performed.
したがって、本発明は上記実状に鑑み、溶存酸素およびホルムアルデヒドを含有する有機排水を効率よく処理することができる有機排水の処理方法を提供することを目的とする。 Therefore, in view of the above situation, an object of the present invention is to provide a method for treating organic wastewater that can efficiently treat organic wastewater containing dissolved oxygen and formaldehyde.
〔構成1〕
上記目的を達成するための本発明の有機排水の処理方法の特徴構成は、溶存酸素およびホルムアルデヒドを含有する有機排水の処理方法であって、
UASB反応槽から排出される二酸化炭素を過飽和に含有する処理済排水を前記UASB反応槽に供給される有機排水の原排水に混合して、前記原排水中の溶存酸素濃度を低下させた後、前記原排水と処理済排水との混合排水を前記UASB反応槽で嫌気処理する点にある。
[Configuration 1]
The characteristic configuration of the organic wastewater treatment method of the present invention for achieving the above object is a method for treating organic wastewater containing dissolved oxygen and formaldehyde,
After mixing the treated wastewater containing carbon dioxide exhausted from the UASB reaction tank in supersaturation with the raw wastewater of the organic wastewater supplied to the UASB reaction tank, the dissolved oxygen concentration in the raw wastewater is reduced, It exists in the point which anaerobically treats the mixed waste_water | drain with the said raw waste_water | drain and a processed waste water in the said UASB reaction tank.
〔作用効果1〕
上記構成によると、UASB反応槽を備えることによって、高濃度の有機排水であってもメタン発酵して、排水を浄化するとともに、メタンガスを回収してエネルギーの再利用が可能となる。
[Operation effect 1]
According to the said structure, by providing a UASB reaction tank, even if it is a high concentration organic wastewater, methane fermentation is carried out, while purifying wastewater, methane gas is collect | recovered and energy reuse becomes possible.
ここで、対象とする有機排水が、溶存酸素およびホルムアルデヒドを含有するものであるため、この有機排水をそのままUASB反応槽に供給すると、UASB反応槽内の嫌気性菌が生育できなくなり嫌気処理が進まなくなる。一方、希釈すると先述のように、排水処理の効率化という所期の目的が達成できない。 Here, since the target organic wastewater contains dissolved oxygen and formaldehyde, if this organic wastewater is supplied to the UASB reaction tank as it is, anaerobic bacteria in the UASB reaction tank cannot grow and anaerobic treatment proceeds. Disappear. On the other hand, if it is diluted, the intended purpose of improving the efficiency of wastewater treatment cannot be achieved as described above.
そこで、本発明者らは、前記UASB反応槽からの処理済排水には、通常、メタン発酵と同時に生成した二酸化炭素が高濃度に含まれている点に着目し、このUASB排水を利用して、有機排水の原排水を希釈することに想到した。そして、前記原排水に、前記処理済排水を混合したところ、前記処理済排水に含まれる二酸化炭素により、前記原排水中の酸素がきわめて効率よく脱気され、UASB反応槽内の嫌気性菌が好適に生育可能なレベルにまで溶存酸素濃度を低下することができることを実験的に見出し本発明を完成させるに至ったのである。 Therefore, the present inventors pay attention to the fact that the treated wastewater from the UASB reaction tank usually contains carbon dioxide produced at the same time as methane fermentation, and uses this UASB wastewater. I came up with the idea of diluting the organic wastewater. And when the said treated wastewater is mixed with the said raw wastewater, the oxygen in the said raw wastewater is deaerated very efficiently by the carbon dioxide contained in the said treated wastewater, and the anaerobic bacteria in a UASB reaction tank are The inventors have experimentally found that the dissolved oxygen concentration can be lowered to a level at which growth can be suitably performed, and have completed the present invention.
すなわち、UASB反応槽を経た処理済排水は、メタン発酵に伴い嫌気性菌が生産した二酸化炭素を過飽和に溶解した状態になっている。二酸化炭素を過飽和に溶解した処理済排水を、前記原排水に混合すると、二酸化炭素が原排水に溶解する過程で、溶解度の低い酸素をガス化させて追い出すため、前記原排水中の溶存酸素濃度が低下する。しかも、前記処理済排水の二酸化炭素濃度が過飽和状態となっていることにより、この二酸化炭素による酸素脱気効率がきわめて高く、単に混合するだけで、嫌気性菌が好適に生育可能なレベルにまで溶存酸素濃度を低下することができると考えられる。 That is, the treated wastewater that has passed through the UASB reaction tank is in a state in which carbon dioxide produced by anaerobic bacteria following methane fermentation is dissolved in supersaturation. When the treated wastewater in which carbon dioxide is dissolved in supersaturation is mixed with the raw wastewater, in the process of dissolving carbon dioxide in the raw wastewater, oxygen with low solubility is gasified and expelled. Decreases. Moreover, since the carbon dioxide concentration of the treated waste water is in a supersaturated state, the oxygen deaeration efficiency due to the carbon dioxide is extremely high, and the level of anaerobic bacteria can be suitably grown by simply mixing. It is considered that the dissolved oxygen concentration can be lowered.
その結果UASB反応槽内では嫌気性菌が活発に働き、原排水中の有機物をメタン発酵してメタンガスを生成するとともに、ホルムアルデヒドを分解して有機排水を浄化することができるとともに、メタンを回収しエネルギー源として利用することができるようになった。 As a result, anaerobic bacteria work actively in the UASB reaction tank, methane fermentation can be performed by methane fermentation of organic matter in the raw wastewater, and organic wastewater can be purified by decomposing formaldehyde and collecting methane. It can be used as an energy source.
〔構成2〕
また、上記目的を達成するための本発明の有機排水の処理装置の特徴構成は、溶存酸素およびホルムアルデヒドを含有する有機排水の処理装置であって、
前記有機排水のメタン発酵に伴って二酸化炭素を過飽和に含有する処理済排水を排出するUASB反応槽を備え、前記処理済排水を前記UASB反応槽の上流側に返送する返送部を備え、前記UASB反応槽に供給される前記有機排水と前記返送部から返送される処理済排水とを混合可能に構成するとともに、混合された排水を前記UASB反応槽に供給する前処理部を備えた点にある。
[Configuration 2]
The characteristic configuration of the organic wastewater treatment apparatus of the present invention for achieving the above object is an organic wastewater treatment apparatus containing dissolved oxygen and formaldehyde,
A UASB reaction tank for discharging treated wastewater containing carbon dioxide in supersaturation with methane fermentation of the organic wastewater, a return unit for returning the treated wastewater to the upstream side of the UASB reaction tank, and the UASB The organic waste water supplied to the reaction tank and the treated waste water returned from the return unit are configured to be mixed , and a pretreatment unit is provided for supplying the mixed waste water to the UASB reaction tank. .
〔作用効果2〕
このような構成を備えると、前記UASB反応槽からのUASB排水は、前記返送部を経由してUASB反応槽の上流側の前処理部に返送される。UASB排水が前記前処理部に投入されると、前記UASB排水と、前記原排水とが混合されることにより、原排水が脱気され、UASB反応槽でメタン発酵可能な水質になる。そして脱気された原排水がUASB反応槽に供給されることにより、UASB反応槽内では嫌気性菌が活発に働き、原排水中の有機物をメタン発酵してメタンガスを生成するとともに、ホルムアルデヒドを分解して有機排水を浄化することとができるとともに、メタンを回収しエネルギー源として利用することができる。
[Operation effect 2]
With such a configuration, the UASB wastewater from the UASB reaction tank is returned to the pretreatment section on the upstream side of the UASB reaction tank via the return section. When the UASB wastewater is introduced into the pretreatment unit, the UASB wastewater and the raw wastewater are mixed, whereby the raw wastewater is degassed, and the water quality becomes methane-fermentable in the UASB reaction tank. By supplying the degassed raw wastewater to the UASB reaction tank, anaerobic bacteria actively work in the UASB reaction tank, methane fermentation of organic matter in the raw wastewater to produce methane gas, and decomposition of formaldehyde Thus, organic wastewater can be purified, and methane can be recovered and used as an energy source.
したがって、溶存酸素およびホルムアルデヒドを含有する有機排水を効率よく処理することができる、省エネルギーでメタン発酵可能な排水処理方法および装置を提供することができるようになった。 Accordingly, it is possible to provide an energy-saving and methane fermentation wastewater treatment method and apparatus that can efficiently treat organic wastewater containing dissolved oxygen and formaldehyde.
以下に、本発明の有機排水の処理装置を説明する。なお、以下に好適な実施例を記すが、これら実施例はそれぞれ、本発明をより具体的に例示するために記載されたものであって、本発明の趣旨を逸脱しない範囲において種々変更が可能であり、本発明は、以下の記載に限定されるものではない。 Below, the processing apparatus of the organic waste water of this invention is demonstrated. In addition, although suitable examples are described below, these examples are described in order to more specifically illustrate the present invention, and various modifications can be made without departing from the spirit of the present invention. The present invention is not limited to the following description.
〔有機排水の処理装置〕
本発明の有機排水の処理装置は、図1に示すように、UASB反応槽1を備え、前記UASB反応槽1から排出される処理済排水を前記UASB反応槽1の上流側に返送する返送部2を備え、前記UASB反応槽1に供給される有機排水の原排水と前記返送部2から返送される処理済排水(返送水)とを混合して、前記原排水中の溶存酸素を脱気するとともに、脱気された原排水を前記UASB反応槽1に供給する前処理部3を備える。
[Organic wastewater treatment equipment]
As shown in FIG. 1, the organic wastewater treatment apparatus of the present invention includes a UASB reaction tank 1, and returns a treated wastewater discharged from the UASB reaction tank 1 to the upstream side of the UASB reaction tank 1. 2, the raw organic wastewater supplied to the UASB reaction tank 1 and the treated wastewater (returned water) returned from the return unit 2 are mixed to degas dissolved oxygen in the raw wastewater. In addition, a pretreatment unit 3 for supplying the degassed raw wastewater to the UASB reaction tank 1 is provided.
(前処理部)
前記前処理部3は、有機排水の原排水を受け入れて貯留する貯水容器30からなり、原排水を受け入れる排水流入部31を備えるとともに、返送部2からの返送水を受け入れ、前記原排水に混合する返送水受入部32を備え、さらに、原排水と返送水との混合液をUASB反応槽1に移流させる移流部33を備える。
(Pre-processing section)
The pretreatment unit 3 includes a
(UASB反応槽)
前記UASB反応槽1は、下部に嫌気性菌(UASB菌)を主体とする汚泥のグラニュールを充填されるスラッジベッド11を備えるとともに、前記前処理部3からの有機排水を供給する供給部12を備える反応容器10からなる。これにより、導入される有機排水の上向流が形成されるとともに、内部の有機排水の循環を促し、流動するグラニュールにより有機物をメタン発酵するメタン発酵工程が行われる。前記スラッジベッド11の上部には、グラニュールの流失を防止するとともに処理済みの上澄液および生成したガスを上方に移流させる分離板13を設けてある。分離板13上方に移流した処理済みの処理済排水は、オーバーフロー部14よりUASB反応槽1外へ取出されるとともに、生成したメタンガスを含むバイオガスは、ガス回収部15よりUASB反応槽1外へ取出される構成となっている。
(UASB reaction tank)
The UASB reaction tank 1 includes a
(返送部)
前記返送部2はUASB反応槽1からの処理済排水を一時貯留する貯水容器20からなり、その処理済排水を受け入れる受入部21と処理済排水を外部に放流、または、処理済排水がさらに浄化処理を要する場合に、その処理済排水を他の浄化処理部に移送させるための放出部22を備える。そして、前記貯水容器20中には、返送ポンプ23を備えるとともに、前記返送ポンプ23により前記前処理部3に処理済排水の一部を返送水として返送する返送路24を連設してある。
(Return part)
The return unit 2 includes a
これにより、有機排水の原排水は、前処理部3で返送された返送水と混合されることにより脱気された状態でUASB反応槽1に供給され、メタン発酵処理されて有機物が消費されるとともに発生した二酸化炭素を過剰に含んだ状態となって、その一部を返送水として返送部2から前記前処理部3に返送されるとともに残部を処理済排水として放流処理可能に構成されている。 As a result, the organic wastewater is supplied to the UASB reaction tank 1 in a degassed state by being mixed with the return water returned by the pretreatment unit 3, and is subjected to methane fermentation treatment to consume organic matter. The carbon dioxide generated together is excessively contained, and a part of the carbon dioxide is returned to the pretreatment unit 3 from the return unit 2 as return water, and the remaining part is discharged as treated waste water. .
〔排水処理試験〕
以下に、有機排水の処理装置による排水処理試験例および比較試験例を示す。
[Wastewater treatment test]
The example of the waste water treatment test by the organic waste water treatment apparatus and the comparative test example are shown below.
(排水処理試験例)
下記成分を含有する有機排水の原排水を図1に示す有機排水の処理装置にて処理した。
ここで、前処理部3の貯水容器30の容量は500mLとし、UASB反応槽1の反応容器10の容量は1L、返送部2を500mLの貯水容器20で構成した。また、供給される配水量は270mL/d、返送部2から前処理部3に対する返送水量は270mL/dとした。また、UASB反応槽1の処理温度は30℃である。
(Example of wastewater treatment test)
The raw organic wastewater containing the following components was treated with the organic wastewater treatment apparatus shown in FIG.
Here, the capacity of the
原排水の組成
CODcr :11,150mg/L
DO(溶存酸素):12mg/L
ホルムアルデヒド:190mg/L
Composition of raw wastewater CODcr: 11,150 mg / L
DO (dissolved oxygen): 12 mg / L
Formaldehyde: 190mg / L
その結果、UASB反応槽1入り口でのDOは、12mg/Lからlmg/Lまで減少しており、UASB反応槽1においてメタン発酵に支障のない程度にまで脱気されていることが明らかになった。また、UASB反応槽1においてバイオガスの発生が確認された。 As a result, DO at the inlet of the UASB reaction tank 1 has decreased from 12 mg / L to 1 mg / L, and it has been clarified that the UASB reaction tank 1 has been degassed to the extent that does not interfere with methane fermentation. It was. In addition, generation of biogas was confirmed in the UASB reaction tank 1.
また、有機排水のCODcr濃度は11150mg/Lから2800mg/Lとなっており、充分な排水浄化が達成されているものと評価できた。なお、返送による希釈を考慮すると、UASB反応槽1におけるメタン発酵による分解率は約60%であったと考えられる。 Further, the CODcr concentration of the organic waste water was 11150 mg / L to 2800 mg / L, and it was evaluated that sufficient waste water purification was achieved. In addition, when the dilution by return is considered, it is thought that the decomposition rate by methane fermentation in the UASB reaction tank 1 was about 60%.
また、返送部2において排水中にホルムアルデヒドは検出されず、高度にホルムアルデヒド含有排水が浄化できていることもわかった。
また、返送部2における排水中の二酸化炭素濃度は3600mg/Lと、きわめて高濃度になっており、前記前処理部3における溶存酸素の脱気のために有効に機能したものと考えられる。
Further, it was also found that formaldehyde was not detected in the waste water in the return section 2, and that the waste water containing formaldehyde was highly purified.
Further, the carbon dioxide concentration in the waste water in the return unit 2 is very high, 3600 mg / L, and it is considered that the carbon dioxide concentration functioned effectively for degassing dissolved oxygen in the pretreatment unit 3.
(比較試験例)
上記原排水を単純にUASB反応槽1に供給し、メタン発酵を試みたが、処理済排水のCODcr濃度は11,000mg/Lとなったことから、ほとんど変化なく、しかもバイオガスの発生は確認されなかったことから、UASB反応槽1における排水処理はほとんど機能していないといえる。
(Comparative test example)
The above raw wastewater was simply supplied to the UASB reactor 1 and methane fermentation was attempted. However, the CODcr concentration of the treated wastewater was 11,000 mg / L, so there was almost no change and the generation of biogas was confirmed. Since it was not performed, it can be said that the waste water treatment in the UASB reaction tank 1 is hardly functioning.
したがって、溶存酸素の高い有機排水であっても、その排水に含有されるホルムアルデヒドを有機物とともに分解処理できるようになることがわかった。 Therefore, it was found that even organic wastewater with high dissolved oxygen can decompose formaldehyde contained in the wastewater together with organic matter.
本発明によると、溶存酸素およびホルムアルデヒドを含有する有機排水を効率よく処理することができる、省エネルギーでメタン発酵可能な排水処理方法および装置を提供することができる。 ADVANTAGE OF THE INVENTION According to this invention, the wastewater treatment method and apparatus which can process the organic wastewater containing dissolved oxygen and formaldehyde efficiently and can perform methane fermentation by energy saving can be provided.
1 :UASB反応槽
10 :反応容器
11 :スラッジベッド
12 :供給部
13 :分離板
14 :オーバーフロー部
15 :ガス回収部
2 :返送部
20 :貯水容器
21 :受入部
22 :放出部
23 :返送ポンプ
24 :返送路
3 :前処理部
30 :貯水容器
31 :排水流入部
32 :返送水受入部
33 :移流部
1: UASB reaction tank 10: reaction vessel 11: sludge bed 12: supply unit 13: separation plate 14: overflow plate 15: gas recovery unit 2: return unit 20: water storage container 21: receiving unit 22: discharge unit 23: return pump 24: Return path 3: Pretreatment section 30: Water storage container 31: Drain inflow section 32: Return water receiving section 33: Advection section
Claims (2)
UASB反応槽から排出される二酸化炭素を過飽和に含有する処理済排水を前記UASB反応槽に供給される有機排水の原排水に混合して、前記原排水中の溶存酸素濃度を低下させた後、前記原排水と処理済排水との混合排水を前記UASB反応槽で嫌気処理する有機排水の処理方法。 A method for treating organic wastewater containing dissolved oxygen and formaldehyde,
After mixing the treated wastewater containing carbon dioxide exhausted from the UASB reaction tank in supersaturation with the raw wastewater of the organic wastewater supplied to the UASB reaction tank, the dissolved oxygen concentration in the raw wastewater is reduced, An organic wastewater treatment method for anaerobically treating mixed wastewater of the raw wastewater and treated wastewater in the UASB reaction tank.
前記有機排水のメタン発酵に伴って二酸化炭素を過飽和に含有する処理済排水を排出するUASB反応槽を備え、前記処理済排水を前記UASB反応槽の上流側に返送する返送部を備え、前記UASB反応槽に供給される前記有機排水と前記返送部から返送される処理済排水とを混合可能に構成するとともに、混合された排水を前記UASB反応槽に供給する前処理部を備えた有機排水の処理装置。 An apparatus for treating organic wastewater containing dissolved oxygen and formaldehyde,
A UASB reaction tank for discharging treated wastewater containing carbon dioxide in supersaturation with methane fermentation of the organic wastewater, a return unit for returning the treated wastewater to the upstream side of the UASB reaction tank, and the UASB Organic wastewater comprising a pretreatment unit configured to mix the organic wastewater supplied to the reaction tank and the treated wastewater returned from the return unit and to supply the mixed wastewater to the UASB reaction tank Processing equipment.
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