JP2009028596A - Treating method of vent gas of tank - Google Patents
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- JP2009028596A JP2009028596A JP2007193182A JP2007193182A JP2009028596A JP 2009028596 A JP2009028596 A JP 2009028596A JP 2007193182 A JP2007193182 A JP 2007193182A JP 2007193182 A JP2007193182 A JP 2007193182A JP 2009028596 A JP2009028596 A JP 2009028596A
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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
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- 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
Abstract
Description
本発明は、タンクのベントガスの処理方法に関するものである。更に詳しくは、本発明は、微生物処理可能な水溶性有機物を貯蔵するタンクのベントガスの処理方法であって、大掛かりな設備を用いることなく、比較的簡単な運転操作により、有機物の大気への放出量を削減することができるという環境保護の観点に優れ、しかも回収した有機物を廃水の活性汚泥処理装置の活性汚泥の微生物の活性促進剤として有効利用できるという利点を有するタンクのベントガスの処理方法に関するものである。 The present invention relates to a method for treating tank vent gas. More particularly, the present invention relates to a method for treating a vent gas in a tank for storing a water-soluble organic substance that can be treated with microorganisms. The organic substance is released into the atmosphere by a relatively simple operation without using a large-scale facility. The present invention relates to a method for treating a vent gas of a tank, which has an advantage of being able to reduce the amount, and having an advantage that the recovered organic matter can be effectively used as an activity promoter for microorganisms of activated sludge in an activated sludge treatment apparatus for wastewater. Is.
たとえば化学工場においては、液体をタンクに貯蔵して用いるのが一般である。ここで、タンクは全体が閉じた構造を有するものが汎用されている。閉じた構造のタンクに液体を供給し又はタンクから液体を排出する場合、タンク内の液体の量の増減に応じてタンク内の圧力が増減する。また、タンク周辺の気温の変化に伴うタンク内の気体の膨張と収縮によってもタンク内の圧力が変動する。かかるタンク内の圧力の増減はタンクの壁材料に対してストレスを与え、タンクの設計圧を超えたり、大気圧より低い圧力となった場合はタンクを損傷する危険があるので、かかる圧力の変動を防止する必要がある。そのためには、タンクの天井部にタンク内の気相部分と連通した気体の導管を設け、タンク内の圧力が増加した場合は該導管からタンク内の気体をタンク外に排出し、一方タンク内の圧力が減少した場合には該導管を通して不活性気体をタンク内に供給、もってタンク内の圧力を一定に維持する装置が設けられているのが通常である。かかる装置をタンクのベント装置と呼び、該装置からタンク外に排出される気体をベントガスと呼ぶ。 For example, in chemical factories, it is common to store liquids in tanks. Here, a tank having a closed structure is generally used. When liquid is supplied to or discharged from a tank having a closed structure, the pressure in the tank increases or decreases according to the increase or decrease in the amount of liquid in the tank. Further, the pressure in the tank also varies due to the expansion and contraction of the gas in the tank accompanying the change in the temperature around the tank. Such increase or decrease of pressure in the tank stresses the wall material of the tank, and if the pressure exceeds the design pressure of the tank or falls below the atmospheric pressure, there is a risk of damaging the tank. Need to prevent. For this purpose, a gas conduit communicating with the gas phase portion in the tank is provided at the ceiling of the tank, and when the pressure in the tank increases, the gas in the tank is discharged from the conduit to the outside of the tank. When the pressure in the tank decreases, it is usual to provide a device for supplying an inert gas into the tank through the conduit so that the pressure in the tank is kept constant. Such a device is called a tank vent device, and a gas discharged from the device to the outside of the tank is called a vent gas.
ところで、ベントガス中にはタンクに貯蔵されている液体が気化した気体が含まれている。ベントガスを大気中に放出した場合、ベントガス中の該気体も大気中に放散されることになる。ここで、該液体が大気を汚染する性質のものである場合、大気汚染の観点から好ましくないという問題が発生する。 By the way, the vent gas contains a gas obtained by vaporizing the liquid stored in the tank. When vent gas is released into the atmosphere, the gas in the vent gas is also released into the atmosphere. Here, when the liquid has a property of polluting the air, there arises a problem that it is not preferable from the viewpoint of air pollution.
そこで、たとえば非特許文献１にはベントガスを吸着剤を充填した吸着塔に導き、そこで大気汚染の原因となる物質を吸着除去し、その後にベントガスを大気に放出するという技術が開示されている。しかし、この方法は、一般に吸着剤の再生や交換が必要なため設備が大掛かりとなり、またその運転も複雑になるという問題がある。 Thus, for example, Non-Patent Document 1 discloses a technique in which a vent gas is guided to an adsorption tower filled with an adsorbent, a substance that causes air pollution is adsorbed and removed, and then the vent gas is released to the atmosphere. However, this method has a problem that it generally requires a large amount of equipment because the adsorbent needs to be regenerated or replaced, and its operation is complicated.
かかる状況において、本発明が解決しようとする課題は、微生物処理可能な水溶性有機物を貯蔵するタンクのベントガスの処理方法であって、大掛かりな設備を用いることなく、比較的簡単な運転操作により、有機物の大気への放出量を削減することができるという環境保護の観点に優れ、しかも回収した有機物を廃水の活性汚泥処理装置の活性汚泥の微生物の活性促進剤として有効利用できるという利点を有するタンクのベントガスの処理方法を提供する点にある。 In such a situation, the problem to be solved by the present invention is a method for treating a vent gas in a tank for storing a water-soluble organic substance that can be treated with microorganisms, and without using a large-scale facility, by a relatively simple operation operation, A tank that has the advantage of being able to reduce the amount of organic matter released into the atmosphere, and that it can effectively use the collected organic matter as an activated sludge microbial activity promoter in the wastewater activated sludge treatment equipment. It is the point which provides the processing method of vent gas.
すなわち、本発明は、微生物処理可能な水溶性有機物を貯蔵するタンクのベントガスの処理方法であって、下記の工程を有するタンクのベントガスの処理方法に係るものである。
（Ａ）：タンクのベントガス中の水溶性有機物を水に吸収させる工程
（Ｂ）：水溶性有機物を吸収した水を活性汚泥の微生物の活性促進剤として活性汚泥処理装置に供給する工程
That is, the present invention relates to a method for treating a vent gas in a tank for storing a water-soluble organic substance that can be treated with microorganisms, and relates to a method for treating a vent gas in a tank having the following steps.
(A): The process which makes water absorb the water-soluble organic substance in the vent gas of a tank (B): The process which supplies the water which absorbed the water-soluble organic substance to the activated sludge processing apparatus as an activity promoter of the microorganisms of activated sludge
本発明により、微生物処理可能な水溶性有機物を貯蔵するタンクのベントガスの処理方法であって、大掛かりな設備を用いることなく、比較的簡単な運転操作により、有機物を大気に放出することがないという環境保護の観点に優れ、しかも回収した有機物を廃水の活性汚泥処理装置の活性汚泥の微生物の活性促進剤として有効利用できるという利点を有するタンクのベントガスの処理方法を提供することができる。 According to the present invention, a method for treating a vent gas in a tank for storing a water-soluble organic substance that can be treated with a microorganism, the organic substance is not released to the atmosphere by a relatively simple operation without using a large-scale facility. It is possible to provide a method for treating a vent gas in a tank, which is excellent in environmental protection and has an advantage that the collected organic matter can be effectively used as an activity promoter for microorganisms of activated sludge in an activated sludge treatment apparatus for wastewater.
本発明は、微生物処理可能な水溶性有機物を貯蔵するタンクのベントガスの処理方法である。 The present invention is a method for treating a vent gas in a tank that stores a water-soluble organic substance that can be treated with microorganisms.
ここで、微生物処理とは、廃水の微生物処理を意味し、活性汚泥をあげることができる。 Here, microbial treatment means microbial treatment of wastewater, and can include activated sludge.
微生物処理可能な水溶性有機物としては、メタノール、ホルムアルデヒド、蟻酸等をあげることができるが、特にメタノールが好適である。 Examples of water-soluble organic substances that can be treated with microorganisms include methanol, formaldehyde, formic acid, and the like, and methanol is particularly preferable.
本発明のタンクの構造や容量には、特に制限はなく、コーンルーフ、ドームルーフ、平屋根、横型ドラム、縦型ドラム等の各タイプをあげることができる。 There is no restriction | limiting in particular in the structure and capacity | capacitance of the tank of this invention, Each type, such as a cone roof, a dome roof, a flat roof, a horizontal drum, a vertical drum, can be mention | raise | lifted.
本発明の方法は、タンクのベントガス中の水溶性有機物を水に吸収させる工程を有する。 The method of the present invention includes a step of causing water to absorb water-soluble organic substances in the vent gas of the tank.
タンクのベントガス中の水溶性有機物を水に吸収させる工程としては、特に制限はなく、公知の吸収装置を用いることができるが、例えば気液接触型の充填塔を用いる方法をあげることができる。これは、充填物を充填した塔の下部から上部に向けて処理すべき気体を流通させ、一方塔の上部から下部に向けて気体を吸収する液体（一般に水）を流通させ、塔内で気体と液体を接触させて気体を液体中に吸収させるものである。一般に充填物は、気液界面積を大きく、また気液両相間の物質移動抵抗を小さくすることを目的に、大きな比表面積をもつ、空隙率が大きい、機械的強度が大きい、安価である、耐食性に優れている、などの条件が要求される。本工程の充填物としては、特に制限は無く、公知のラシヒリング、ベルルサドル、テラレット等を利用できる。運転操作の条件は、吸収させる気体の種類、その濃度等に依存する。例えば、ベントガス中のメタノールの濃度は、（タンク気相部温度におけるメタノール蒸気圧）／（タンク気相部における全圧）×１００で算出することができ、タンクの温度２５℃のメタノールタンクではベントガス中のメタノールの濃度が１７容積％程度となり、常温常圧等の条件が設備面、経済面から好ましい。 There is no restriction | limiting in particular as a process which makes water absorb the water-soluble organic substance in the vent gas of a tank, Although a well-known absorption apparatus can be used, For example, the method of using a gas-liquid contact type packed tower can be mention | raise | lifted. This is because the gas to be treated is circulated from the lower part to the upper part of the tower packed with packing, while the liquid (generally water) that absorbs the gas is circulated from the upper part to the lower part of the tower, And the liquid are brought into contact with each other to absorb the gas into the liquid. In general, the packing has a large specific surface area, a large porosity, a large mechanical strength, and a low price for the purpose of increasing the gas-liquid interfacial area and reducing the mass transfer resistance between the gas-liquid phases. Conditions such as excellent corrosion resistance are required. There is no restriction | limiting in particular as a filler of this process, A well-known Raschig ring, Berle saddle, terralet etc. can be utilized. The operating conditions depend on the type of gas to be absorbed, its concentration, and the like. For example, the concentration of methanol in the vent gas can be calculated as (methanol vapor pressure at the tank gas phase temperature) / (total pressure in the tank gas phase) × 100. The concentration of methanol is about 17% by volume, and conditions such as normal temperature and normal pressure are preferable from the viewpoint of facilities and economy.
本発明においては、水溶性有機物を吸収した水は活性汚泥の微生物の活性促進剤として活性汚泥処理装置に供給される。 In this invention, the water which absorbed water-soluble organic substance is supplied to the activated sludge processing apparatus as an activity promoter of the microorganisms of activated sludge.
活性汚泥処理装置に供給される水の中の微生物処理可能な水溶性有機物の濃度は１５重量％以下が好ましく、かつＢＯＤ５／ＴＯＤの比が０．４以上であることが好ましい。ここで、ＢＯＤ５とはＢＯＤ（生物化学的酸素要求量：水中の有機物が微生物により酸化分解されるときに必要とされる酸素量（測定値））のうち２０℃で５日間培養したときに消費される酸素量であり、ＴＯＤ（全酸素要求量）とは供試物質が完全に酸化されるときに必要とされる理論的な酸素量（計算値）である。水溶性有機物の濃度が過大であると水溶性有機物の気相分圧が高くなり、所望の除去率が達成できなくなる場合があり、またＢＯＤ５／ＴＯＤの比が過小であると活性汚泥の活性促進剤としての効果を充分得られず、有機物の分解が不充分になる場合がある。 The concentration of the water-soluble organic substance that can be treated with microorganisms in the water supplied to the activated sludge treatment apparatus is preferably 15% by weight or less, and the ratio of BOD5 / TOD is preferably 0.4 or more. Here, BOD5 is BOD (biochemical oxygen demand: the amount of oxygen required when organic substances in water are oxidatively decomposed by microorganisms (measured value)) and consumed when cultured at 20 ° C. for 5 days. The TOD (total oxygen demand) is a theoretical oxygen amount (calculated value) required when the test substance is completely oxidized. If the concentration of the water-soluble organic substance is excessive, the gas-phase partial pressure of the water-soluble organic substance may increase, and the desired removal rate may not be achieved. If the ratio of BOD5 / TOD is too small, the activated sludge activity is promoted. In some cases, the effect as an agent cannot be sufficiently obtained, and the decomposition of organic substances becomes insufficient.
本発明の好ましい実施態様として、タンクのベントガス中の水溶性有機物を水に吸収させる工程が気液接触型の充填塔を用い、該吸収後の水を貯槽に導き、該貯槽の水の一部を吸収塔へリサイクルさせ、貯槽の水の残部を微生物処理設備へ供給し、かつ貯槽へ濃度調整用の水を供給することにより貯槽中の水中の微生物処理可能な水溶性有機物の濃度を調整する方法をあげることができる。貯槽としては、特に容器の制限は無く、液を必要量保有できるドラムやタンクあげることができる。該水溶性有機物の濃度調整用の水としては、新水を持ちいればよい。一方、該水溶性有機物の濃度が低すぎる場合は、一時的に新水の供給と活性汚泥への供給を停止して濃度調整してもよいし、タンクに保有する水溶性有機物の一部を該貯槽へ加えてもよい。調整する濃度は前記のとおりである。 As a preferred embodiment of the present invention, the step of absorbing water-soluble organic matter in the vent gas of the tank into the water uses a gas-liquid contact type packed tower, the absorbed water is guided to a storage tank, and a part of the water in the storage tank Is recycled to the absorption tower, the remainder of the water in the storage tank is supplied to the microbial treatment facility, and the water for concentration adjustment is supplied to the storage tank to adjust the concentration of water-soluble organic substances that can be treated with microorganisms in the water in the storage tank. I can give you a way. The storage tank is not particularly limited and can be a drum or a tank that can hold a required amount of liquid. As water for adjusting the concentration of the water-soluble organic substance, it is sufficient to have fresh water. On the other hand, when the concentration of the water-soluble organic substance is too low, the supply of fresh water and the supply to activated sludge may be temporarily stopped to adjust the concentration, or a part of the water-soluble organic substance held in the tank may be You may add to this storage tank. The concentration to be adjusted is as described above.
次に本発明を実施例により説明する。
実施例１
図１に示すフローの装置を用いた。
Next, the present invention will be described with reference to examples.
Example 1
The apparatus of the flow shown in FIG. 1 was used.
工業用メタノール（１）（濃度９９．９重量％以上）を水溶性有機物タンク（２）に貯蔵した。メタノールはタンクから送液ポンプ（３）を経て系内に供給される。タンク内の圧力が減少した場合、導管（４）からは窒素が供給された。タンクの天井部にはベントガスを排出するための導管（５）が設けられている。ベントガスは導管（５）を経て、タンクベントガスブロワー（６）により充填塔（７）の下部に導かれた。充填塔の上部から、循環させた吸収液（水）（８）が吸収液送液ポンプ（９）によって供給された。充填塔内でベントガス中のメタノール（気体）が吸収液中に吸収された。充填塔の頂部からメタノール成分が除去されたベントガス（１０）が大気に放出された。充填塔の底部からメタノール成分を吸収した吸収液（水）（８）が排出され、吸収液の貯蔵タンク（１１）へ送られた。タンクに貯蔵された吸収液は再び吸収液送液ポンプ（９）によって充填塔に供給された。また、その一部は活性汚泥処理装置（１２）へ送られた。適宜吸収液の成分濃度をガス濃度計（１３）で測定し、濃度調整用の新水（１４）を充填塔に供給し、該成分濃度を調整した。かくして、メタノール成分が除去されたベントガス（１０）は、ベントガス中のメタノール量の９０重量％以上が除去された。また、活性汚泥処理装置へ送られる水中のメタノールの濃度は１０％以下に維持され、かつＢＯＤ５／ＴＯＤの比は０．４以上に維持された。 Industrial methanol (1) (concentration 99.9% by weight or more) was stored in a water-soluble organic substance tank (2). Methanol is supplied from the tank to the system via the liquid feed pump (3). When the pressure in the tank decreased, nitrogen was supplied from the conduit (4). A conduit (5) for discharging vent gas is provided at the ceiling of the tank. The vent gas was led to the lower part of the packed tower (7) by the tank vent gas blower (6) via the conduit (5). From the upper part of the packed tower, the circulated absorption liquid (water) (8) was supplied by an absorption liquid feed pump (9). Methanol (gas) in the vent gas was absorbed into the absorption liquid in the packed tower. Vent gas (10) from which the methanol component was removed from the top of the packed tower was released to the atmosphere. Absorbing liquid (water) (8) having absorbed the methanol component was discharged from the bottom of the packed tower and sent to the absorbing liquid storage tank (11). The absorption liquid stored in the tank was again supplied to the packed tower by the absorption liquid feed pump (9). Moreover, a part thereof was sent to the activated sludge treatment apparatus (12). The component concentration of the absorbent was appropriately measured with a gas concentration meter (13), and fresh water (14) for concentration adjustment was supplied to the packed tower to adjust the component concentration. Thus, in the vent gas (10) from which the methanol component was removed, 90% by weight or more of the amount of methanol in the vent gas was removed. Further, the concentration of methanol in the water sent to the activated sludge treatment apparatus was maintained at 10% or less, and the ratio of BOD5 / TOD was maintained at 0.4 or more.
１ 工業用メタノール
２ 水溶性有機物タンク
３ 送液ポンプ
４ 窒素導管
５ ベントガス導管
６ タンクベントガスブロワー
７ 充填塔
８ メタノール成分を吸収した吸収液（水）
９ 吸収液送液ポンプ
10 メタノール成分が除去されたベントガス
11 メタノール成分を吸収した吸収液（水）の貯蔵タンク
12 活性汚泥処理装置
13 ガス濃度計
14 濃度調整用の新水
DESCRIPTION OF SYMBOLS 1 Industrial methanol 2 Water-soluble organic substance tank 3 Liquid feed pump 4 Nitrogen conduit 5 Vent gas conduit 6 Tank vent gas blower 7 Packing tower 8 Absorption liquid (water) which absorbed methanol component
9 Absorption liquid pump
10 Vent gas with methanol components removed
11 Absorption liquid (water) storage tank that has absorbed methanol components
12 Activated sludge treatment equipment
13 Gas concentration meter
14 Fresh water for concentration adjustment
Claims (4)
（Ａ）：タンクのベントガス中の水溶性有機物を水に吸収させる工程
（Ｂ）：水溶性有機物を吸収した水を活性汚泥の微生物の活性促進剤として活性汚泥処理装置に供給する工程 A method for treating a vent gas in a tank for storing a water-soluble organic substance that can be treated with microorganisms, the tank vent gas comprising the following steps.
(A): The process which makes water absorb the water-soluble organic substance in the vent gas of a tank (B): The process which supplies the water which absorbed the water-soluble organic substance to the activated sludge processing apparatus as an activity promoter of the microorganisms of activated sludge
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004081907A (en) * | 2002-08-23 | 2004-03-18 | Oki Electric Ind Co Ltd | Method and apparatus for treating organic exhaust gas |
| JP2004098014A (en) * | 2002-09-12 | 2004-04-02 | Nippon Shokubai Co Ltd | Method for treating gas containing volatile organic compound |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117101354A (en) * | 2023-08-24 | 2023-11-24 | 岳阳隆兴实业有限公司 | Method for treating chlorobutane tail gas of liquid storage tank and application of method |
| CN117101354B (en) * | 2023-08-24 | 2024-02-20 | 岳阳隆兴实业有限公司 | Method for treating chlorobutane tail gas of liquid storage tank and application of method |
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