JPH10109091A - Treatment of water - Google Patents
Treatment of waterInfo
- Publication number
- JPH10109091A JPH10109091A JP26454296A JP26454296A JPH10109091A JP H10109091 A JPH10109091 A JP H10109091A JP 26454296 A JP26454296 A JP 26454296A JP 26454296 A JP26454296 A JP 26454296A JP H10109091 A JPH10109091 A JP H10109091A
- Authority
- JP
- Japan
- Prior art keywords
- water
- gas
- treated
- tank
- pressurized
- 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
Landscapes
- Separation Using Semi-Permeable Membranes (AREA)
- Physical Water Treatments (AREA)
- Treatment Of Water By Oxidation Or Reduction (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、上水、下水又は中水道
での膜分離による水処理方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for treating water by membrane separation in tap water, sewage or central water.
【０００２】[0002]
【従来の技術】上水や下水の高度処理では、一般に硫酸
バン土、ポリ塩化アルミニウム（ＰＡＣ）等の凝集剤を
使用し、凝集、沈殿、砂ろ過等の組み合わせを経て処理
している。この方法では凝集剤等の薬品を多く消費する
こと、広大な設備面積と設備費を必要とするという問題
があった。2. Description of the Related Art In the advanced treatment of tap water and sewage, a flocculant such as bansulfate or polyaluminum chloride (PAC) is generally used, and the treatment is performed through a combination of flocculation, precipitation, and sand filtration. This method has a problem that a large amount of chemicals such as a flocculant is consumed and a large equipment area and equipment cost are required.
【０００３】最近、これに代わるものとして濾過膜を用
いた水処理法への関心が高まり、小規模水道向を中心
に、開発が進められているが、未解決の問題点も少なく
ない。水道用に用いられる濾過膜には、沈殿槽等による
懸濁物の前除去を行わず、原水に含まれる全ての懸濁物
が負荷されている例が多く、濾過膜の目詰まりが起き易
く、空気等を用いた頻繁な濾過膜の逆洗等の処理が必要
となり、動力費が嵩む。さらには、逆洗等でも目詰まり
が回復しない場合は、酸、アルカリ、次亜塩素酸塩等に
よるいわゆる薬注洗浄、または機械洗浄等が必要とな
る。また、河川水を処理する場合には、降雨直後には汚
濁成分が増加し、膜に高い汚濁負荷が加わり、さらに季
節的に種々の藻類や微生物の繁殖し易い時期には、直接
それらが懸濁負荷となり、膜透過水量の著しい低下を来
した事例も少なくない。しかし、これらの問題に対する
適切な対策は未だ講じられていないのが現状である。[0003] Recently, as an alternative to this, interest in a water treatment method using a filtration membrane has been increasing, and development has been promoted mainly for small-scale water supply, but there are many unsolved problems. In many cases, the filtration membrane used for water supply is loaded with all the suspensions contained in the raw water without prior removal of the suspended matter by a sedimentation tank or the like, and the filtration membrane is easily clogged. In addition, frequent treatments such as back washing of the filtration membrane using air or the like are required, and the power cost is increased. Further, if clogging is not recovered by backwashing or the like, so-called chemical washing with acid, alkali, hypochlorite, or the like, or mechanical washing is required. Also, when treating river water, pollutant components increase immediately after rainfall, a high pollution load is applied to the membrane, and they are directly suspended during the season when various algae and microorganisms are easy to propagate. In many cases, the load became turbid and the amount of permeated water decreased significantly. However, at present, no appropriate countermeasures have been taken against these problems.
【０００４】[0004]
【発明が解決しようとする課題】本発明は、前述の従来
の技術の有する諸問題点にかんがみ、濾過膜を使用した
水処理方法において、原水を濾過膜に供給するに先立っ
て原水の懸濁物質負荷の変動に対しても即応して確実に
懸濁物質を除去し、濾過膜の目詰まりを最小限に抑制す
るための処理方法の提供を課題とする。SUMMARY OF THE INVENTION In view of the above-mentioned problems of the prior art, the present invention relates to a water treatment method using a filtration membrane, in which the raw water is suspended before the raw water is supplied to the filtration membrane. It is an object of the present invention to provide a processing method for removing suspended substances reliably in response to a change in a substance load and minimizing clogging of a filtration membrane.
【０００５】[0005]
【課題を解決するための手段】濾過膜を用いた水処理方
法において、被処理水に空気又はオゾン含有気体を加圧
溶解、または加圧気体として供給して、被処理水中の懸
濁物質を上昇気泡によって浮上分離させることにより除
去した後に、濾過膜によって分離処理を行うる水の処理
方法である。In a water treatment method using a filtration membrane, air or an ozone-containing gas is dissolved in water to be treated under pressure or supplied as a pressurized gas to remove suspended substances in the water to be treated. This is a method for treating water in which a separation treatment is performed by a filtration membrane after removing by floating separation with rising bubbles.
【０００６】[0006]
【発明の実施の形態】図面を参照して本発明を説明す
る。図１は、本発明の１実施例を説明する図である。処
理すべき懸濁物質を含有した被処理水１は、混合器２に
よって、必要に応じて凝集剤等の薬剤３と混合されて、
接触器４において加圧気体飽和水５と混合され、微細な
気泡が懸濁物粒子と気固会合体を形成し、見かけの比重
が減少して浮上分離槽６内を大きな浮上速度で浮上し、
水面上にフロス７として蓄積する。フロスは固形物とし
て、通常２〜３％の濃度の濃縮物であり、間欠的にもし
くは連続的にスキマー８により掻き寄せられて系外に排
出し排棄物として処理される。一方、懸濁物質が分離さ
れた水は阻流壁９の下部から溢流槽１０に流入し、次い
で、溢流槽から膜浸漬槽１１に流入し、膜濾過装置１２
によって濾過されて処理水１３として水道用等に供され
る。膜濾過装置は、図に示したような膜浸漬槽に浸漬し
て吸引ポンプで吸引して透過水を得る浸漬型のもので
も、加圧水を供給して透過水を得るケーシング収納型の
ものであってもよい。DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described with reference to the drawings. FIG. 1 is a diagram for explaining one embodiment of the present invention. The water to be treated 1 containing the suspended substance to be treated is mixed with a chemical 3 such as a flocculant as required by a mixer 2,
The gas is mixed with the pressurized gas-saturated water 5 in the contactor 4, and fine bubbles form a gas-solid association with the suspended particles, the apparent specific gravity decreases, and the particles float in the flotation tank 6 at a high flotation speed. ,
Accumulate as floss 7 on the water surface. The floss is a concentrate having a concentration of usually 2 to 3% as a solid, and is intermittently or continuously scraped by the skimmer 8 and discharged out of the system to be treated as a waste. On the other hand, the water from which the suspended matter has been separated flows into the overflow tank 10 from the lower part of the baffle wall 9 and then flows into the membrane immersion tank 11 from the overflow tank, and the membrane filtration device 12
, And supplied as treated water 13 for tap water. The membrane filtration device may be of the immersion type that is immersed in a membrane immersion tank as shown in the figure and suctioned by a suction pump to obtain permeate, or may be the casing storage type that supplies pressurized water to obtain permeate. You may.
【０００７】また、加圧気体飽和水は、溢流槽１０から
被処理水の一部を循環水１４として取り出し、加圧ポン
プ１５によって加圧された水と、気体圧縮機１６によっ
て加圧された気体１７を、加圧気体飽和槽１８に導き接
触されて調製される。The pressurized gas-saturated water is obtained by extracting a part of the water to be treated from the overflow tank 10 as circulating water 14, and is pressurized by a pressurizing pump 15 and pressurized by a gas compressor 16. The gas 17 is introduced into the pressurized gas saturation tank 18 and brought into contact therewith to be prepared.
【０００８】水に飽和溶解させる気体は空気でも良い
が、オゾン含有気体を用いることによって、原水中のフ
ミン酸、フルボ酸等の着色成分、２−メチルイソボルネ
オール等の異臭成分、鉄、マンガン等の無機化合物の酸
化除去を行うことができる。オゾン含有気体を用いる場
合には、浮上分離槽、溢流槽等の排気中に残存するオゾ
ンを、分解触媒等を備えたオゾン分解装置において分解
し、無害化して放出することが必要となる。The gas to be saturated and dissolved in water may be air, but by using an ozone-containing gas, coloring components such as humic acid and fulvic acid in raw water, off-flavor components such as 2-methylisoborneol, iron and manganese, etc. Of the inorganic compound can be removed by oxidation. When an ozone-containing gas is used, it is necessary to decompose ozone remaining in exhaust gas from a flotation tank, overflow tank, or the like in an ozone decomposer equipped with a decomposition catalyst or the like, detoxify the ozone, and discharge the ozone.
【０００９】本発明における加圧浮上分離は、気体が溶
存した加圧水を注入することによって、微細な気泡を発
生させて微細気泡の付着した気固会合体を生成させるも
のであるが、気体の溶存水に限らず加圧気体を浮上分離
槽の下部に注入して微細な気泡を発生させるものであっ
ても良い。The pressurized levitation separation in the present invention is to generate fine gas bubbles by injecting pressurized water in which a gas is dissolved to form a gas-solid association with the fine bubbles attached. Not only water but also pressurized gas may be injected into the lower part of the flotation tank to generate fine bubbles.
【００１０】本発明の処理方法は、濾過膜による安定し
た水処理の運転の維持に有効であるが、とりわけ降雨直
後の高濁度原水（例えば５０度以上等）時や、あるいは
湖沼、ダムなどの湛水を原水とする場合に不可避とされ
る藻類が繁殖した水に対して効用が発揮されるもので、
膜濾過装置に正常な負荷を与え、安定した運転を可能と
することができる。とくに、藻類の発生は、温度の変化
等の環境の要因により突然に生じることがあるが、本発
明の方法では、こうした問題にも充分に対応することが
可能である。The treatment method of the present invention is effective for maintaining stable operation of water treatment using a filtration membrane. Particularly, the treatment method is used when raw water having a high turbidity (for example, 50 degrees or more) immediately after rainfall, or in lakes, dams and the like. It is effective against water in which algae breeding, which is inevitable when flooding is used as raw water,
A normal load can be applied to the membrane filtration device, and stable operation can be performed. In particular, the occurrence of algae may occur suddenly due to environmental factors such as a change in temperature, but the method of the present invention can sufficiently cope with such a problem.
【００１１】また、本発明の方法では、懸濁物質粒子に
微気泡を会合させた気固会合体と水との比重差に基づく
浮上が主体となるので、凝集剤は会合体の架橋作用を補
助する程度でよい。これに対して、凝集剤のみによって
分離しようとすると、藻類を含む水は、一般にｐＨが８
〜１０と高いので、凝集剤によって藻類を分離しようと
すると、中性域のｐＨとするために多量の凝集剤を必要
とするので、本発明の方法では、凝集剤の添加量を節減
できる。原水の水質や性状次第で凝集剤等の薬剤を無添
加で浮上分離することも可能であり、また浮上分離法は
高負荷運転が可能で、凝集沈殿法に比し、はるかに短い
滞流時間の分離槽による処理でよい。Further, in the method of the present invention, since the floating is mainly based on the difference in specific gravity between water and the gas-solid aggregate in which microbubbles are associated with the suspended substance particles, the flocculant has a crosslinking effect on the aggregate. It is enough to assist. On the other hand, if it is attempted to separate by only a flocculant, water containing algae generally has a pH of 8
When the algae are separated by a flocculant, a large amount of the flocculant is required to adjust the pH to a neutral range. Therefore, the amount of the flocculant to be added can be reduced in the method of the present invention. Depending on the water quality and properties of the raw water, it is possible to float and separate chemicals such as flocculants without addition, and the flotation method is capable of high-load operation and has a much shorter residence time than the flocculation and sedimentation method. The treatment in the separation tank may be sufficient.
【００１２】[0012]
【発明の効果】濾過膜を用いた水処理方法において、前
処理として被処理水中の懸濁粒子を空気またはオゾン含
有気体を用いて浮上分離した後に膜濾過を行うので、降
雨直後の高濁度や藻類繁殖時等の被処理水の水質変動も
緩和して、常に膜濾過装置に適正な負荷を与え、濾過膜
の洗浄頻度を大幅に低減し、長期にわたりに安定した運
転を可能とする。As described above, in the water treatment method using a filtration membrane, membrane filtration is carried out as a pretreatment after suspended particles in the water to be treated are floated using air or an ozone-containing gas, so that high turbidity immediately after rainfall is obtained. It also reduces fluctuations in the quality of the water to be treated during breeding and algae breeding, constantly applies an appropriate load to the membrane filtration device, greatly reduces the frequency of washing the filtration membrane, and enables stable operation for a long period of time.
【図１】本発明の一実施例を説明する図である。FIG. 1 is a diagram illustrating an embodiment of the present invention.
１…被処理水、２…混合器、３…薬剤、４…接触器、５
…加圧気体飽和水、６…浮上分離槽、７…フロス、８…
スキマー、９…阻流壁、１０…溢流槽、１１…膜浸漬
槽、１２…膜濾過装置、１３…処理水、１４…循環水、
１５…加圧ポンプ、１６…気体圧縮機、１７…加圧され
た気体、１８…加圧気体飽和槽DESCRIPTION OF SYMBOLS 1 ... Water to be treated, 2 ... Mixer, 3 ... Drug, 4 ... Contactor, 5
... pressurized gas saturated water, 6 ... flotation tank, 7 ... floss, 8 ...
Skimmer, 9: baffle wall, 10: overflow tank, 11: membrane immersion tank, 12: membrane filtration device, 13: treated water, 14: circulating water,
15 ... Pressure pump, 16 ... Gas compressor, 17 ... Pressurized gas, 18 ... Pressurized gas saturation tank
Claims (1)
処理水に空気又はオゾン含有気体を加圧溶解、または加
圧気体として供給して、被処理水中の懸濁物質を上昇気
泡によって浮上分離させることにより除去した後に、濾
過膜によって分離処理を行うことを特徴とする水の処理
方法。In a water treatment method using a filtration membrane, air or an ozone-containing gas is dissolved under pressure or supplied as a pressurized gas to water to be treated, and suspended substances in the water to be treated are lifted by rising bubbles. A method for treating water, comprising performing a separation treatment by a filtration membrane after removing by separation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP26454296A JPH10109091A (en) | 1996-10-04 | 1996-10-04 | Treatment of water |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP26454296A JPH10109091A (en) | 1996-10-04 | 1996-10-04 | Treatment of water |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH10109091A true JPH10109091A (en) | 1998-04-28 |
Family
ID=17404722
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP26454296A Pending JPH10109091A (en) | 1996-10-04 | 1996-10-04 | Treatment of water |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH10109091A (en) |
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20010056230A (en) * | 1999-12-09 | 2001-07-04 | 최윤찬 | Unified Tower-typed Water Treatment Plant |
| KR100408484B1 (en) * | 2000-12-20 | 2003-12-06 | 주식회사 앤바이오 | Treatment Equipment of Wastewater |
| KR100414580B1 (en) * | 2001-04-10 | 2004-01-07 | 주식회사 아이이아이 | A purification system for a waste water of livestock |
| KR100420561B1 (en) * | 2001-05-29 | 2004-03-06 | 주식회사 탑이엔씨 | Micro Dissolved Oxygen Flotation System |
| JP2006167551A (en) * | 2004-12-14 | 2006-06-29 | Kurita Water Ind Ltd | Biological treatment apparatus |
| KR100806472B1 (en) | 2007-02-22 | 2008-02-21 | 한상배 | The water treatment facilities with the function of dissolved air flotation, filtration, membrane-separation and biofilter |
| KR101134099B1 (en) | 2009-12-18 | 2012-04-13 | 한국건설기술연구원 | Combined Dissolved Air Flotation and Submerged Membrane Device and Method using Waste Air Reuse and such Device |
| DE102012207731A1 (en) * | 2012-05-09 | 2013-11-14 | Matan Beery | Apparatus and method for the pre-purification of water, in particular seawater |
| JPWO2014007301A1 (en) * | 2012-07-05 | 2016-06-02 | 東レ株式会社 | Fresh water generation method and fresh water generation apparatus |
| CN109231374A (en) * | 2018-11-22 | 2019-01-18 | 重庆市口天科技有限公司 | A kind of purification assembly of sewage treatment |
| CN109231604A (en) * | 2018-11-22 | 2019-01-18 | 重庆市口天科技有限公司 | A kind of quick treatment for reuse system of electric machining sewage |
| KR102151055B1 (en) * | 2020-01-21 | 2020-09-03 | 큰나라찬사회적협동조합 | Complex-type water treatment apparatus using submersed membrane modules |
-
1996
- 1996-10-04 JP JP26454296A patent/JPH10109091A/en active Pending
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20010056230A (en) * | 1999-12-09 | 2001-07-04 | 최윤찬 | Unified Tower-typed Water Treatment Plant |
| KR100408484B1 (en) * | 2000-12-20 | 2003-12-06 | 주식회사 앤바이오 | Treatment Equipment of Wastewater |
| KR100414580B1 (en) * | 2001-04-10 | 2004-01-07 | 주식회사 아이이아이 | A purification system for a waste water of livestock |
| KR100420561B1 (en) * | 2001-05-29 | 2004-03-06 | 주식회사 탑이엔씨 | Micro Dissolved Oxygen Flotation System |
| JP4591678B2 (en) * | 2004-12-14 | 2010-12-01 | 栗田工業株式会社 | Biological treatment equipment |
| JP2006167551A (en) * | 2004-12-14 | 2006-06-29 | Kurita Water Ind Ltd | Biological treatment apparatus |
| KR100806472B1 (en) | 2007-02-22 | 2008-02-21 | 한상배 | The water treatment facilities with the function of dissolved air flotation, filtration, membrane-separation and biofilter |
| KR101134099B1 (en) | 2009-12-18 | 2012-04-13 | 한국건설기술연구원 | Combined Dissolved Air Flotation and Submerged Membrane Device and Method using Waste Air Reuse and such Device |
| DE102012207731A1 (en) * | 2012-05-09 | 2013-11-14 | Matan Beery | Apparatus and method for the pre-purification of water, in particular seawater |
| US10029925B2 (en) | 2012-05-09 | 2018-07-24 | Akvola Technologies GmbH | Apparatus and method for cleaning water |
| JPWO2014007301A1 (en) * | 2012-07-05 | 2016-06-02 | 東レ株式会社 | Fresh water generation method and fresh water generation apparatus |
| CN109231374A (en) * | 2018-11-22 | 2019-01-18 | 重庆市口天科技有限公司 | A kind of purification assembly of sewage treatment |
| CN109231604A (en) * | 2018-11-22 | 2019-01-18 | 重庆市口天科技有限公司 | A kind of quick treatment for reuse system of electric machining sewage |
| KR102151055B1 (en) * | 2020-01-21 | 2020-09-03 | 큰나라찬사회적협동조합 | Complex-type water treatment apparatus using submersed membrane modules |
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