JP2005246185A - Water treatment and air diffusion equipment and operation management method - Google Patents
Water treatment and air diffusion equipment and operation management method Download PDFInfo
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- JP2005246185A JP2005246185A JP2004058365A JP2004058365A JP2005246185A JP 2005246185 A JP2005246185 A JP 2005246185A JP 2004058365 A JP2004058365 A JP 2004058365A JP 2004058365 A JP2004058365 A JP 2004058365A JP 2005246185 A JP2005246185 A JP 2005246185A
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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
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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
- Y02W10/20—Sludge processing
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Abstract
Description
本発明は、浸漬型散気管及び散気ノズルを用いた各種水処理装置において、ブロワー等の加圧空気供給装置或いは純酸素その他の気体の供給装置の運転停止或いは送気圧力異常低下に起因する散気管特に散気ノズルの閉塞トラブルに関し、この閉塞トラブルを未然に防止するための設備及び運転管理方法に関するものである。 The present invention relates to various water treatment apparatuses using submerged diffuser tubes and diffuser nozzles, due to a shutdown of a pressurized air supply device such as a blower or a supply device of pure oxygen or other gases, or an abnormal decrease in air supply pressure. The present invention relates to an obstruction trouble for an air diffuser, particularly an air diffuser nozzle, and relates to equipment and an operation management method for preventing the obstruction trouble.
水処理の分野では、排水、原水、余剰汚泥等に酸素供給、攪拌、浸漬型膜分離装置の閉塞防止等のために、散気管及び散気ノズルより空気、純酸素その他の気体を供給する方法が広く採用されている。 In the field of water treatment, a method of supplying air, pure oxygen and other gases from the diffuser pipe and the diffuser nozzle in order to supply oxygen, agitate, and prevent the clogging of the submerged membrane separation device to drainage, raw water, surplus sludge, etc. Is widely adopted.
しかしながら、運転管理上間欠曝気したり、負荷の軽い時に曝気を一時停止したり、或いは装置の故障や台風地震などの自然災害による停電等種々の原因により、空気、純酸素その他の気体の供給が停止となり、送気管内の圧力が低下すると、汚水の水頭圧により、懸濁物質を含む汚水が散気装置に逆流し、時間の経過とともに、汚水中の懸濁物質が散気ノズルや散気管に沈着して閉塞を生じさせる事例が数多く発生している。 However, the supply of air, pure oxygen, and other gases may be caused by various causes such as intermittent aeration for operation management, aeration temporarily stopped when the load is light, or power failure due to natural disasters such as equipment failure or typhoon earthquake. When the pressure in the air pipe decreases, the sewage containing suspended solids flows back to the diffuser due to the head pressure of the sewage, and as time passes, suspended solids in the sewage flow through the diffuser nozzle and diffuser. There have been many cases of depositing on the surface and causing blockage.
散気装置の一部が閉塞すると、曝気或いは攪拌効果が不均一になり、水処理効率が低下し、甚だしい場合には、水処理装置の運転を停止して装置内を空にした後、散気装置を分解掃除することが必要になる。散気効率を良くするためには、散気ノズルの孔径をなるべく小さくして小さな気泡を発生させることが望ましいのであるが、ノズルの孔径が小さいほどこの閉塞現象は発生し易く、効率を犠牲にしてある程度ノズルの孔径を大きくせざるを得ない場合が多い。 If a part of the air diffuser is blocked, the aeration or agitation effect becomes non-uniform and the water treatment efficiency decreases.In severe cases, the water treatment device is stopped and the inside of the device is emptied. It is necessary to disassemble and clean the air device. In order to improve the air diffusion efficiency, it is desirable to generate small bubbles by making the hole diameter of the air diffusion nozzle as small as possible. However, the smaller the nozzle hole diameter, the easier this clogging phenomenon occurs, and at the expense of efficiency. In many cases, the nozzle hole diameter must be increased to some extent.
散気装置の代りにエジェクターを使用する方法も採用されているが、閉塞現象が発生しない反面発泡現象が発生しやすく、水処理業界では散気ノズル或いは散気管の閉塞の可能性があっても、この方式が広く採用されているのが現状である。 Although a method using an ejector instead of the air diffuser is also adopted, the clogging phenomenon does not occur, but the foaming phenomenon is likely to occur, and even in the water treatment industry, there is a possibility that the air diffuser nozzle or the air diffuser may be blocked. Currently, this method is widely adopted.
この散気装置の閉塞現象の発生を防止するために、水処理メーカーからは、散気装置の構造を工夫することにより、排水が散気管へ逆流することを防止する構造の提案が種々なされているが構造が複雑高価であり、現実には比較的に簡単な構造の散気ノズルが広く採用されている。従って、この閉塞現象によるトラブルが後を絶たないのが現状である。 In order to prevent the occurrence of the blockage phenomenon of the diffuser, various proposals have been made by water treatment manufacturers to prevent the drainage from flowing back to the diffuser by devising the structure of the diffuser. However, the structure is complicated and expensive, and in reality, a diffuser nozzle having a relatively simple structure is widely used. Therefore, the current situation is that there is no end to trouble caused by this blockage phenomenon.
特開平11―244674号公報では、浸漬型膜分離装置用の散気装置において、散気孔閉塞の原因を縷々詳述し、その対策として、『気体供給管よりも下方に延在する延長部を設け、該延長部に該延長部内を槽内に開放する開放部を設ける。(請求項1)』しているが、これは散気装置内への逆流を前提とした対策である。 In Japanese Patent Laid-Open No. 11-244674, in the diffuser for the submerged membrane separator, the cause of the obstruction of the diffuser holes is often described in detail, and as a countermeasure, an extension portion extending below the gas supply pipe is used. And an open portion that opens the inside of the extension into the tank. (Claim 1) ”, but this is a measure premised on the backflow into the diffuser.
特開2003−154236号公報では、浸漬型膜分離装置用の散気装置の運転管理方法として、散気装置の洗浄のために、洗浄液を5秒〜5分散気装置に注入する運転方法(請求項1)が提案されているが、この方法も散気装置内への汚水の逆流を前提としている。 In Japanese Patent Laid-Open No. 2003-154236, as an operation management method for an air diffuser for a submerged membrane separator, an operation method for injecting a cleaning liquid into the air diffuser for 5 seconds to 5 for cleaning the air diffuser (claim) Item 1) has been proposed, but this method also presupposes the backflow of sewage into the diffuser.
しかしながら、上記のいずれの方法も、懸濁物質を含む排水の逆流を完全に防止しておらず、散気装置の閉塞トラブルを完全に解決することは困難である。 However, none of the above methods completely prevent the backflow of the wastewater containing suspended solids, and it is difficult to completely solve the trouble of blocking the diffuser.
水処理装置の散気装置において、送気管内の圧力低下時に、散気装置内に縣濁物質或いはスケール形成成分を含む汚水が逆流し、これが原因で散気装置特に散気ノヅルが閉塞し、水処理装置の運転効率が低下する問題を解決することを目的としている。 In the air diffuser of the water treatment device, when the pressure in the air supply pipe decreases, the sewage containing suspended substances or scale forming components flows backward in the air diffuser, which causes the air diffuser, particularly the air diffuser nozzle, The purpose is to solve the problem that the operating efficiency of the water treatment device is lowered.
本願発明は、水処理装置或いは水処理装置より発生する余剰汚泥等の縣濁物質処理装置おいて、間歇曝気、故障、メンテナンス作業、停電事故等何らかの原因で送気停止となり、これが為に散気装置内の気体圧力が低下する時に、送気管或いは散気管に、手動或いは自動的に注入水を供給し、散気装置内の圧力を常に散気装置に外から作用する水圧以上に維持することにより、散気装置内に汚水が逆流することによる散気装置の閉塞トラブルを根本的に防止するものである。 The present invention is a water treatment device or a suspended matter treatment device such as surplus sludge generated from the water treatment device, which stops air supply for some reason such as intermittent aeration, failure, maintenance work, power outage accident, etc. When the gas pressure in the device drops, the injection water is supplied manually or automatically to the air supply pipe or the air diffuser, and the pressure in the air diffuser is always maintained above the water pressure acting on the air diffuser. Thus, the problem of blockage of the air diffuser due to the backflow of sewage into the air diffuser is fundamentally prevented.
散気装置への送気方法として最も広く採用されている方法は、ルーツブロワー等のブロワーを用いて気体を圧縮する方法である。送気ブロワーが停止した場合、送気管の逆止弁がある場合には、時間の経過とともに送気管及び散気装置内の圧力は急激に低下し、散気装置の散気孔の気体圧力が汚水の水頭圧となった時点で、散気が停止する。散気孔が下向きであれば、この時点で汚水と気体の圧力は平衡するので、散気装置への汚水の逆流は起こらない。 The most widely adopted method for supplying air to the diffuser is a method of compressing gas using a blower such as a Roots blower. When the air blower is stopped or there is a check valve for the air supply pipe, the pressure in the air supply pipe and the air diffuser suddenly decreases over time, and the gas pressure in the air diffuser of the air diffuser becomes sewage The aeration stops when the water head pressure is reached. If the air diffuser is downward, the sewage and the gas pressure are balanced at this point, so that the sewage does not flow back to the air diffuser.
しかしながら、送気された気体はブロワーで断熱圧縮されて温度上昇した気体である。例えば空気の場合20℃の空気を大気圧から大気圧の1.5倍の圧力(約0.1MPaから0.15MPa)に断熱圧縮すれば、温度は約37℃上昇する。 However, the supplied gas is a gas whose temperature has been increased by adiabatic compression with a blower. For example, in the case of air, if 20 ° C. air is adiabatically compressed from atmospheric pressure to 1.5 times the atmospheric pressure (about 0.1 MPa to 0.15 MPa), the temperature rises by about 37 ° C.
ブロワーが運転停止すると時間の経過とともに、送気管及び散気装置内の空気の温度は、その冷却速度は汚水及び外気の温度にもよるが、徐々に低下し、したがって気体の圧力もその絶対温度の低下にほぼ比例して徐々に低下して吸引負圧を発生し、送気管に逆支弁が設けられている場合には、散気装置の各散気孔に完全な逆流防止機能を備えていない限り、散気装置より汚水を吸引することになる。 When the blower is shut down, the temperature of the air in the air pipe and the diffuser gradually decreases over time, although the cooling rate depends on the temperature of the sewage and the outside air, so the gas pressure is also reduced to its absolute temperature. If the suction pipe is provided with a reverse support valve that gradually decreases in proportion to the decrease in the pressure, and the air supply pipe is provided with a reverse support valve, each air diffuser of the air diffuser does not have a complete backflow prevention function. As long as the sewage is sucked from the diffuser.
更に、送気管に逆支弁がない場合、或いは逆支弁があっても逆支弁の機能が完全でない場合には、散気装置の各散気孔に完全な逆流防止機能を備えていない限り、外から散気装置に作用する汚水頭圧により、送気管及び散気装置内の空気は、ブロワーのローターとステイター間の隙間を通って大気中に押し出され、最終的には散気管及び送気管内の汚水の高さが散気装置の設置されている装置の液面とほぼ同じ高さになるまで、汚水が逆流することになる。 Furthermore, if there is no reverse support valve in the air supply pipe, or if the function of the reverse support valve is not perfect even if there is a reverse support valve, the air diffuser should not be equipped with a complete backflow prevention function from outside. Due to the sewage head pressure acting on the air diffuser, the air in the air duct and the air diffuser is pushed out into the atmosphere through the gap between the rotor and the stirrer of the blower, and finally the air in the air diffuser and the air diffuser. The sewage flows backward until the height of the sewage is almost the same as the liquid level of the device where the diffuser is installed.
本発明では、送気管及び散気装置内の気体圧力が低下する場合には、散気装置の閉塞原因となる物質を含まない注入水を、送気管或いは散気管に注入することにより、散気装置内の圧力を常に散気装置の散気孔の外圧と等しく或いはそれ以上に保つことにより、散気装置内への逆流を完全に防止して、散気装置の閉塞問題を根本的に解決するものである。 In the present invention, when the gas pressure in the air supply pipe and the air diffuser decreases, the air diffused by injecting into the air supply pipe or the air diffuser the injection water that does not contain a substance that causes the air diffuser to be blocked. By keeping the pressure inside the device always equal to or greater than the external pressure of the air diffuser of the diffuser, the backflow into the diffuser is completely prevented and the blockage problem of the diffuser is fundamentally solved. Is.
なお本発明では、送気装置の運転停止時に送気管或いは散気装置に注入水を注入した後も、雨水の流入、原水の流入量増加、抜き出し流量の減少等何らかの理由で散気装置の設置されている装置の液面が上昇し、散気装置の散気孔に外から作用する汚水の水頭圧が上昇する可能性がある場合には、散気装置への逆流を完全に防止するためには、この汚水の水頭圧の上昇に見合う分だけの少量の注入水を注入し続ければ良い。 In the present invention, the air diffuser is installed for some reason, such as inflow of rainwater, increase in inflow of raw water, decrease in extraction flow rate, etc. If the liquid level of the installed device rises and the head pressure of the sewage acting from the outside on the diffuser hole of the diffuser may increase, in order to completely prevent the backflow to the diffuser Therefore, it is only necessary to continuously inject a small amount of injection water corresponding to the increase in the head pressure of the sewage.
本発明による散気システムでは、散気装置への逆流現象が発生しないので、散気装置の散気孔が上向きでなければ、即ち水平ないし下向きならば、縣濁物質が沈降してもそれが散気装置内に入ることはなく、非常に単純安価な構造の散気装置を採用することができる。 In the air diffusion system according to the present invention, since the backflow phenomenon to the air diffuser does not occur, if the air diffuser hole of the air diffuser is not upward, that is, if it is horizontal or downward, even if the suspended substance sinks, it is diffused. An air diffuser having a very simple and inexpensive structure can be employed without entering the air apparatus.
図1に示すように、水処理装置の曝気槽に散気装置を設け、散気装置には逆支弁を介してルーツブロワーより加圧空気が供給されている。送気管の途中には、注入水ヘッドタンクより注入配管が逆支弁を介して接続されている。 As shown in FIG. 1, an aeration device is provided in an aeration tank of a water treatment device, and pressurized air is supplied to the aeration device from a roots blower via a reverse valve. In the middle of the air supply pipe, an injection pipe is connected from the injection water head tank via a reverse valve.
ヘッドタンクには注入水がフロート弁を介して供給され、注入操作がおこなわれていないときには常に一定の液面を保持している。このヘッドタンク液面高さを、送気管内の空気圧が正常な圧力以下に低下した時には、逆支弁が直ちに開いて自動的に注水操作がおこなわれるような高さに設定されている。ヘッドタンクの容量が、散気装置内の容積より十分大きければ、自然災害等による停電事故に対しても、汚水の散気装置への逆流を防止することが出来る。このようなシステムにより、汚水が散気装置内に逆流することを完全に防ぎ、散気装置の閉塞現象を本質的に解決することができる。 Injection water is supplied to the head tank through a float valve, and a constant liquid level is always maintained when no injection operation is performed. The liquid level of the head tank is set such that when the air pressure in the air supply pipe drops below the normal pressure, the back valve immediately opens and the water injection operation is performed automatically. If the capacity of the head tank is sufficiently larger than the volume in the diffuser, it is possible to prevent the backflow of sewage to the diffuser even in the event of a power failure due to a natural disaster or the like. With such a system, it is possible to completely prevent the sewage from flowing back into the diffuser and essentially solve the blockage phenomenon of the diffuser.
なおヘッドタンクの替わりに、ブロワーのモーターの運転停止信号或いは送気管の圧力計より信号を得て、注水管の自動弁を操作する方法も容易に採用することが出来る。停電対策としては、フェイルセイフオープンの自動弁を採用することで対処可能である。 Instead of the head tank, a method of operating the automatic valve of the water injection pipe by obtaining a signal from the operation stop signal of the blower motor or the pressure gauge of the air supply pipe can be easily adopted. As a power failure countermeasure, it is possible to cope with it by adopting a fail-safe open automatic valve.
圧力計の信号により注水弁を自動操作するシステムの場合、散気装置に作用する汚水の水頭圧は通常大きく変動するものではないが、水頭圧が大きく変動し、その為に注水弁の作動圧力の調節する必要がある場合には、汚水の液面或いは汚水の散気装置に作用する水頭圧を自動計測するなどの方法により、注水弁の作動圧力を自動的に制御することは、現代の制御技術おもってすれば容易である。 In the case of a system that automatically operates the water injection valve based on the signal from the pressure gauge, the head pressure of the sewage acting on the air diffuser does not usually change greatly, but the water head pressure fluctuates greatly, and therefore the operating pressure of the water injection valve If it is necessary to adjust the operating pressure of the water injection valve by automatically measuring the head pressure acting on the sewage level or the sewage diffuser, It is easy if you have control technology.
本発明により、水処理装置の汚水による散気装置の閉塞トラブルを本質的に防止し、安価な散気装置を採用することができ、経済効果の大きな発明である。 By this invention, the obstruction | occlusion trouble of the diffuser by the sewage of a water treatment apparatus can be prevented essentially, an inexpensive diffuser can be employ | adopted, and it is an invention with a big economic effect.
1汚水供給配管
2曝気槽
3散気装置
4オーバーフロー管
5汚泥沈降槽
6処理水オーバーフロー管
7送気ブロワー
8送気管
9逆支弁
10逆支弁
11圧力計
12ヘッドタンク
13フロート弁
14バルブ
15バルブ
16注入水配管
1
Claims (4)
As a method of injecting injected water into the above-mentioned air supply pipe or diffuser pipe, if the water supply pipe is attached to the air supply pipe from the head tank via a reverse support valve, the pressure in the air supply pipe drops abnormally. The facility and operation management method according to claim 1, wherein water is injected more automatically.
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Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2009172583A (en) * | 2007-12-27 | 2009-08-06 | Jfe Engineering Corp | Air diffuser |
JP2012187522A (en) * | 2011-03-10 | 2012-10-04 | Jfe Engineering Corp | Air diffuser |
CN105036376A (en) * | 2015-08-31 | 2015-11-11 | 广东鑫都环保实业有限公司 | Aeration system anti-blocking method and blocking-free aeration system |
CN115367866A (en) * | 2022-10-24 | 2022-11-22 | 青州市珺凯工业装备有限公司 | Aerator with anti-blocking effect |
JP2022191708A (en) * | 2021-06-16 | 2022-12-28 | 株式会社アンレット | Carbon dioxide recovery device |
-
2004
- 2004-03-03 JP JP2004058365A patent/JP2005246185A/en active Pending
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2009172583A (en) * | 2007-12-27 | 2009-08-06 | Jfe Engineering Corp | Air diffuser |
JP2012187522A (en) * | 2011-03-10 | 2012-10-04 | Jfe Engineering Corp | Air diffuser |
CN105036376A (en) * | 2015-08-31 | 2015-11-11 | 广东鑫都环保实业有限公司 | Aeration system anti-blocking method and blocking-free aeration system |
JP2022191708A (en) * | 2021-06-16 | 2022-12-28 | 株式会社アンレット | Carbon dioxide recovery device |
JP7334992B2 (en) | 2021-06-16 | 2023-08-29 | 株式会社アンレット | Carbon dioxide capture device |
CN115367866A (en) * | 2022-10-24 | 2022-11-22 | 青州市珺凯工业装备有限公司 | Aerator with anti-blocking effect |
CN115367866B (en) * | 2022-10-24 | 2023-01-06 | 青州市珺凯工业装备有限公司 | Aerator with anti-blocking effect |
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