JPH1190432A - Method for sterilizing wastewater of washing separation membrane - Google Patents
Method for sterilizing wastewater of washing separation membraneInfo
- Publication number
- JPH1190432A JPH1190432A JP9260572A JP26057297A JPH1190432A JP H1190432 A JPH1190432 A JP H1190432A JP 9260572 A JP9260572 A JP 9260572A JP 26057297 A JP26057297 A JP 26057297A JP H1190432 A JPH1190432 A JP H1190432A
- Authority
- JP
- Japan
- Prior art keywords
- separation membrane
- washing
- wastewater
- oocysts
- water
- 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)
- Separation Of Suspended Particles By Flocculating Agents (AREA)
- Heat Treatment Of Water, Waste Water Or Sewage (AREA)
- Physical Water Treatments (AREA)
- Treatment Of Water By Oxidation Or Reduction (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、河川水等の原水を
浄化処理するための分離膜を洗浄した排水を殺菌する方
法に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for disinfecting waste water after cleaning a separation membrane for purifying raw water such as river water.
【０００２】[0002]
【従来の技術】従来、河川水や湖水等の原水から水道用
水や工業用水を製造する方法として、ポリ塩化アルミニ
ウム等の凝集剤を原水に添加して原水中の懸濁物質を凝
集させてフロックを形成して沈殿させ濾過により取り除
いて浄水を製造する凝集沈殿濾過法が主に用いられてい
た。2. Description of the Related Art Conventionally, as a method for producing tap water or industrial water from raw water such as river water or lake water, flocculants such as polyaluminum chloride are added to raw water to flocculate suspended substances in the raw water. A coagulated sedimentation filtration method of producing purified water by forming and precipitating and removing by filtration has been mainly used.
【０００３】しかしながら、凝集沈殿濾過法は、凝集剤
によるフロックの形成のコントロールが難しく、目視に
よる監視が欠かせず、自動化が困難である点や処理場の
設置に広い面積を要する点や、原水水質の急激な変化に
充分対応できない点等の問題を抱えている。However, the flocculation-sedimentation filtration method is difficult to control the formation of flocs by a flocculant, and is indispensable for visual monitoring, is difficult to automate, requires a large area for installation of a treatment plant, It has problems such as not being able to respond sufficiently to rapid changes in water quality.
【０００４】そこで、近年において、処理水量の小規模
な浄水場では、限外濾過膜等の分離膜で原水中の懸濁物
質を除去して浄化する方法が用いられ始めている。分離
膜による浄水処理法は、凝集剤等の添加が不要である点
や、処理の自動化が容易であるという利点があるもの
の、濾過により分離膜表面に原水中の懸濁物質が付着す
ると、透過水量が低下し処理水量が減少する問題があ
る。従って、分離膜による浄水処理法では、３０分ない
し１時間毎に逆洗等により濾過膜面を洗浄して付着した
懸濁物質を取り除く必要がある。従って、分離膜の洗浄
排水には原水中に含まれていた懸濁物質が比較的高濃度
で存在することになる。[0004] In recent years, in a small-scale water purification plant having a small amount of treated water, a method of removing suspended substances in raw water using a separation membrane such as an ultrafiltration membrane to purify the water has been used. The water purification method using a separation membrane has the advantage of not requiring the addition of a flocculant or the like, and has the advantage that the treatment is easy to automate. There is a problem that the amount of water decreases and the amount of treated water decreases. Therefore, in the water purification treatment method using a separation membrane, it is necessary to wash the filtration membrane surface by backwashing every 30 minutes to 1 hour to remove the attached suspended substances. Therefore, the suspended solids contained in the raw water are present at a relatively high concentration in the washing wastewater of the separation membrane.
【０００５】このように、分離膜の洗浄排水中には原水
中のさまざまな懸濁物質が含まれているが、その中に
は、近年問題となっている感染性微生物、例えばクリプ
トスポリジウムのオーシストのような低濃度の塩素系の
殺菌剤では死滅しない微生物が濃縮されている可能性が
ある。[0005] As described above, various suspended solids in raw water are contained in the washing wastewater of the separation membrane. Among them, oocysts of infectious microorganisms, such as cryptosporidium, which have recently become a problem. Microorganisms that do not die with low concentrations of chlorine-based germicides such as may be concentrated.
【０００６】従来、分離膜の洗浄排水はそのまま放流さ
れており、このような感染性微生物が含まれたまま、放
流することは、河川水等の再汚染の可能性があるため好
ましくない。そこで分離膜の洗浄排水を殺菌する必要が
ある。殺菌する方法としては、分離膜の洗浄排水をその
まま、加熱やオゾンなどにより処理する方法がある。Conventionally, the washing wastewater of the separation membrane has been discharged as it is, and it is not preferable to discharge it while containing such infectious microorganisms, since there is a possibility of recontamination of river water or the like. Therefore, it is necessary to sterilize the washing wastewater of the separation membrane. As a sterilization method, there is a method in which the washing wastewater of the separation membrane is directly treated by heating, ozone, or the like.
【０００７】[0007]
【発明が解決しようとする課題】分離膜の洗浄排水の量
は、膜処理の回収率によって変わってくるが、通常は回
収率が９０〜９５％であるので洗浄排水の割合は１０〜
５％であり、例えば処理水量が１０００ｍ3／ｄの場合
は、５０〜１００ｍ3／ｄの分離膜洗浄排水が排出され
る。この分離膜の洗浄排水をそのままの量で殺菌する
と、コストが高く、殺菌が不完全になることは明らかで
ある。The amount of the washing wastewater from the separation membrane varies depending on the recovery rate of the membrane treatment. However, since the recovery rate is usually 90 to 95%, the ratio of the washing wastewater is 10 to 95%.
5%, for example, when the treated water amount is 1000 m 3 / d, 50 to 100 m 3 / d of separation membrane cleaning drainage is discharged. It is clear that sterilization of the washing wastewater of the separation membrane in the same amount is costly and incomplete sterilization.
【０００８】本発明が解決しようとする課題は、浄水の
製造に用いる分離膜の洗浄排水中にクリプトスポリジウ
ムのオーシストが混入した場合にも有効かつ効率的な分
離膜洗浄排水の殺菌方法を提供することにある。[0008] The problem to be solved by the present invention is to provide a method for disinfecting the separation membrane washing wastewater which is effective and efficient even when Cryptosporidium oocysts are mixed in the separation membrane washing wastewater used for producing purified water. It is in.
【０００９】[0009]
【課題を解決するための手段】本発明者らは、分離膜の
洗浄排水中の懸濁物質を分離・濃縮し、この懸濁物質を
含む濃縮水を殺菌することにより、上記課題が解決され
ることを見いだし本発明を完成させるに至った。Means for Solving the Problems The present inventors have solved the above-mentioned problems by separating and concentrating suspended substances in washing and draining water of a separation membrane, and sterilizing concentrated water containing the suspended substances. And completed the present invention.
【００１０】すなわち、請求項１に記載の本発明は、河
川水等の原水を分離膜により濾過して浄化する方法にお
いて、濾過により懸濁物質が付着した分離膜を洗浄した
際に排出される洗浄排水中の懸濁物質を分離・濃縮した
後、分離した懸濁物質を含む濃縮水を殺菌することを特
徴としている。That is, according to the first aspect of the present invention, in a method for purifying raw water such as river water by filtration using a separation membrane, the raw water is discharged when the separation membrane to which suspended substances are adhered by filtration is washed. After separating and concentrating suspended substances in the washing wastewater, concentrated water containing the separated suspended substances is sterilized.
【００１１】請求項２に記載の本発明は、分離膜が限外
濾過膜であることを特徴としている。According to a second aspect of the present invention, the separation membrane is an ultrafiltration membrane.
【００１２】請求項３に記載の本発明は、洗浄排水中の
懸濁物質を分離・濃縮する方法が、遠心分離、凝集沈殿
分離または濾過分離であることを特徴としている。The present invention according to claim 3 is characterized in that the method for separating and concentrating suspended substances in the washing wastewater is centrifugation, coagulation sedimentation separation or filtration separation.
【００１３】請求項４に記載の本発明は、殺菌方法が、
加熱法、酸化剤添加法および紫外線照射法から選ばれる
少なくとも１種の殺菌法であることを特徴としている。[0013] According to a fourth aspect of the present invention, there is provided the sterilization method,
It is characterized by at least one kind of sterilization method selected from a heating method, an oxidizing agent addition method, and an ultraviolet irradiation method.
【００１４】[0014]
【発明の実施の形態】本発明における分離膜の処理対象
となる原水は、浄水や工業用水の原水となるもので、例
えば河川水、湖沼水、地下水、海水等である。これらの
原水中には、無機粒子や、金属イオン由来のコロイド物
質等の懸濁物質と共にクリプトスポリジウムのオーシス
ト等の微生物などが含まれている場合がある。DETAILED DESCRIPTION OF THE INVENTION Raw water to be treated by the separation membrane in the present invention is purified water or industrial water, such as river water, lake water, groundwater, and seawater. These raw waters may contain microorganisms such as cryptosporidium oocysts together with inorganic particles and suspended substances such as colloidal substances derived from metal ions.
【００１５】本発明における分離膜は、浄水処理に使用
できる分離膜であれば特に限定されないが、例えば限外
濾過膜、精密濾過膜等である。[0015] The separation membrane in the present invention is not particularly limited as long as it is a separation membrane that can be used for water purification treatment. Examples thereof include an ultrafiltration membrane and a microfiltration membrane.
【００１６】本発明における分離膜の洗浄方法は、分離
膜に付着した懸濁物質を除去できる方法であれば特に限
定されないが、例えば、濾過処理とは逆に分離膜の二次
側（濾過水側）から一次側（原水側）に、濾過水等の洗
浄用水を通過させて洗浄する逆洗法や、分離膜の一次側
に通常の濾過処理時より高流速で原水等の洗浄用水を流
して洗浄する方法等を挙げることができる。The method for washing the separation membrane in the present invention is not particularly limited as long as it can remove suspended substances attached to the separation membrane. For example, the secondary side of the separation membrane (filtered water Side) to the primary side (raw water side) from the backwashing method, in which washing water such as filtered water is passed through for washing, or washing water such as raw water flowing through the primary side of the separation membrane at a higher flow rate than during normal filtration. Washing method.
【００１７】また、上記洗浄の際に、洗浄用水中に次亜
塩素酸ナトリウムを有効塩素として０．１〜２ｐｐｍの
濃度となるように添加して洗浄してもよい。なお、この
ように次亜塩素酸ナトリウムを添加した洗浄用水を用い
て分離膜を洗浄した場合でも、その添加量が上述のよう
に低濃度であるので、クリプトスポリジウムのオーシス
トは不活化せず、したがって洗浄排水中には依然として
クリプトスポリジウムのオーシストが存在することにな
る。In the above-mentioned washing, washing may be carried out by adding sodium hypochlorite to the washing water so as to have a concentration of 0.1 to 2 ppm as available chlorine. In addition, even when the separation membrane is washed using the washing water to which sodium hypochlorite is added as described above, the oocyst of Cryptosporidium is not inactivated because the amount of addition is low as described above, Therefore, oocysts of Cryptosporidium still exist in the washing wastewater.
【００１８】分離膜の洗浄排水中には、懸濁物質が存在
しているので、まず懸濁物質を洗浄排水から分離・濃縮
する。原水がクリプトスポリジウムのオーシストで汚染
されていても、オーシストは分離膜で補足されるので、
このオーシストは懸濁物質と共に洗浄排水中に存在し、
そして、洗浄排水中の懸濁物質を分離・濃縮する際に同
時に分離され、濃縮される。Since suspended matter is present in the washing wastewater of the separation membrane, the suspended matter is first separated and concentrated from the washed wastewater. Even if the raw water is contaminated with Cryptosporidium oocysts, the oocysts are captured by the separation membrane,
This oocyst is present in the wash effluent along with suspended solids,
Then, when the suspended substances in the washing wastewater are separated and concentrated, they are simultaneously separated and concentrated.
【００１９】洗浄排水から懸濁物質を分離・濃縮する方
法は特に限定されないが、例えば遠心分離法、凝集沈殿
分離法または濾過分離法等が挙げられる。クリプトスポ
リジウムのオーシストは比重が１．１前後であるため、
洗浄排水を遠心分離によりオーシストを懸濁物質と共に
汚泥側に移行させたり、凝集剤を洗浄排水に添加して汚
泥フロックにオーシストを取り込ませて沈殿分離した
り、凝集剤を添加することなく単に沈澱分離したりし
て、洗浄排水を濾過分離すればよい。以上のようにオー
シストを懸濁物質と共に分離して濃縮し、得られた濃縮
水を殺菌すれば、従来の分離膜洗浄排水をそのまま殺菌
する場合に比して、殺菌対象の量を大幅に減少すること
ができ、殺菌剤のコストを低減することができ、殺菌効
果をより高めることができる。The method for separating and concentrating suspended substances from the washing wastewater is not particularly limited, and examples thereof include a centrifugal separation method, a coagulation sedimentation separation method and a filtration separation method. Cryptosporidium oocysts have a specific gravity of around 1.1,
The washing wastewater is transferred to the sludge side together with suspended substances by centrifugation, the flocculant is added to the washing wastewater, the oocyst is taken into the sludge floc and separated by sedimentation, or the sedimentation is performed without adding a flocculant. For example, the washing wastewater may be separated by filtration. If the oocysts are separated and concentrated together with the suspended substances as described above, and the resulting concentrated water is sterilized, the amount of sterilization target will be significantly reduced compared to the case where conventional separation membrane cleaning wastewater is sterilized as it is. The cost of the germicide can be reduced, and the germicidal effect can be further enhanced.
【００２０】分離・濃縮した懸濁物質の濃度は特に限定
されるものではないが、固形分濃度が０．５〜１０ｗｔ
％となるように分離・濃縮操作を行った後、殺菌処理を
行えばよい。The concentration of the suspended substance separated and concentrated is not particularly limited, but the solid content concentration is 0.5 to 10 wt.
% After performing the separation and concentration operation.
【００２１】懸濁物質を分離した後の分離膜洗浄排水に
は、オーシスト等の感染性微生物は存在しないので、懸
濁物質を分離した後の分離膜洗浄排水はそのまま放流す
るか原水系へ戻してもよい。Since infectious microorganisms such as oocysts are not present in the separation membrane washing wastewater after the separation of the suspended matter, the separation membrane washing wastewater after the separation of the suspended matter is discharged as it is or returned to the raw water system. You may.
【００２２】懸濁物質の分離方法を具体的に説明する
と、遠心分離法の場合は１０００×ｇ以上で１０分間以
上遠心すればよい。凝集沈殿分離法の場合は、ポリ塩化
アルミニウム等の凝集剤を入れいてフロックを形成させ
て、そのフロックに分離膜洗浄排水中の懸濁物質と一緒
にオーシストを取り込ませ、沈殿させて分離すればよ
い。沈殿に時間がかかる場合は、濾過分離、例えば砂や
プラスチック製充填材等を充填した濾過塔や分離膜を用
いた濾過器に補足して分離すればよい。The method of separating suspended substances is specifically described. In the case of centrifugation, centrifugation may be performed at 1,000 × g or more for 10 minutes or more. In the case of the coagulation sedimentation separation method, a flocculant such as polyaluminum chloride is added to form a floc, and the oocyst is taken into the floc along with the suspended substance in the separation membrane washing wastewater, sedimented and separated. Good. When the precipitation takes a long time, the separation may be carried out by filtration, for example, by supplementing to a filtration tower filled with sand or a plastic filler or a filter using a separation membrane.
【００２３】分離膜洗浄排水から分離された懸濁物質を
含む濃縮水を殺菌する方法は、オーシストを不活化する
方法であれば特に限定されないが、加熱法、紫外線照射
法、酸化剤添加法から単独またはこれらを組み合わせて
選択すればよい。オーシストを完全に死滅させるために
は、加熱法であれば６０℃で３０分以上、７０℃で５分
以上加熱すればよい。紫外線照射法では、１５，０００
ｍＷ／ｓで３時間以上紫外線を照射すればよい。酸化剤
添加法では、オゾンや次亜塩素酸ナトリウム、液体塩
素、二酸化塩素等の塩素系酸化剤を用いることができ、
オゾンの場合は、溶存オゾン濃度が１ｍｇ／Ｌ以上の濃
度となる条件で１０分以上オゾンを通気させればよく、
塩素系酸化剤の場合は有効塩素として８０ｍｇ／Ｌの濃
度で２時間以上殺菌処理を行えばよい。オーシストを死
滅させるためには上記の殺菌法を単独で行うより、二つ
以上を組み合わせて行う方が効果的である。The method of disinfecting the concentrated water containing suspended substances separated from the separation membrane washing wastewater is not particularly limited as long as it is a method of inactivating oocysts, and includes a heating method, an ultraviolet irradiation method, and an oxidizing agent addition method. A single or a combination of these may be selected. In order to completely kill the oocysts, heating at 60 ° C. for 30 minutes or more and heating at 70 ° C. for 5 minutes or more can be performed by a heating method. In the ultraviolet irradiation method, 15,000
Irradiation with ultraviolet light may be performed at mW / s for 3 hours or more. In the oxidizing agent addition method, a chlorine-based oxidizing agent such as ozone, sodium hypochlorite, liquid chlorine, and chlorine dioxide can be used.
In the case of ozone, ozone may be passed for 10 minutes or more under the condition that the concentration of dissolved ozone is 1 mg / L or more.
In the case of a chlorine-based oxidizing agent, sterilization may be performed at a concentration of 80 mg / L as available chlorine for 2 hours or more. In order to kill oocysts, it is more effective to combine two or more than to perform the above-described sterilization method alone.
【００２４】[0024]
実施例１ 分離膜（分画分子量１５万の限外濾過膜）で、懸濁物質
（ＳＳ）濃度１０ｍｇ／Ｌの原水を濾過流束１．２ｍ3
／ｍ2・日の条件で濾過処理し、逆洗流量５．８ｍ3／ｍ
2・日の条件で逆洗して、ＳＳ濃度１００ｍｇ／Ｌの分
離膜洗浄排水５００ｍｌを得た。分離膜洗浄排水にオー
シストを添加し、オーシストで汚染された分離膜洗浄排
水を調製した後、この分離膜洗浄排水中のオーシストの
個数を測定し、表１に示した。オーシストで汚染された
分離膜洗浄排水を１，０００×ｇで１０分遠心処理し
た。遠心処理後の上澄水中のオーシストの個数を測定
し、表１に示した。遠心分離後の懸濁物質を含む濃縮水
（固形分濃度：０．５％）は１０ｍｌであり、１／５０
に減容された。懸濁物質を含む濃縮水を７０℃で１０分
間加熱し殺菌処理した。加熱処理した濃縮水のオーシス
トを分離し、ＰＩ排除法でオーシストの生死を確認し
た。その結果を表１に示す。Example 1 Raw water having a suspension substance (SS) concentration of 10 mg / L was filtered through a separation membrane (ultrafiltration membrane having a molecular weight cut off of 150,000) at a filtration flux of 1.2 m 3.
/ M 2 · day, filtered and backwashed at 5.8 m 3 / m
Backwashing was performed under the conditions of 2 days to obtain 500 ml of separation membrane washing wastewater having an SS concentration of 100 mg / L. After oocysts were added to the separation membrane washing wastewater to prepare separation membrane washing wastewater contaminated with oocysts, the number of oocysts in the separation membrane washing wastewater was measured, and the results are shown in Table 1. Separation membrane washing wastewater contaminated with oocysts was centrifuged at 1,000 × g for 10 minutes. The number of oocysts in the supernatant water after the centrifugation was measured and is shown in Table 1. The concentrated water (solid content concentration: 0.5%) containing the suspended matter after centrifugation was 10 ml, and was 1/50
Was reduced in volume. The concentrated water containing the suspended substance was sterilized by heating at 70 ° C. for 10 minutes. The oocysts of the heat-treated concentrated water were separated, and the viability of the oocysts was confirmed by the PI exclusion method. Table 1 shows the results.
【００２５】[0025]
【表１】 [Table 1]
【００２６】表１に示した結果から明らかなように、分
離膜洗浄排水中のオーシストは、遠心分離後の上澄水に
は含まれておらず、また遠心分離された懸濁物質中に移
行したオーシストは加熱殺菌処理により死滅しているこ
とが分かる。As is evident from the results shown in Table 1, the oocysts in the separation membrane washing drainage were not contained in the supernatant water after centrifugation, and migrated into the centrifuged suspended matter. It can be seen that the oocysts have been killed by the heat sterilization treatment.
【００２７】実施例２ 実施例１と同一の条件で濾過処理および逆洗を行なっ
て、ＳＳ濃度１００ｍｇ／Ｌの分離膜洗浄排水１０００
Ｌを得た。分離膜洗浄排水にオーシストを添加し、オー
シストで汚染された分離膜洗浄排水を調製した後、この
分離膜洗浄排水中のオーシストの個数を測定し、表２に
示した。オーシストで汚染された分離膜洗浄排水にポリ
塩化アルミニウム３０ｍｇ／ｌ添加し、混合して凝集物
を形成させた後、プラスチック充填材（径４ｍｍ、長さ
１０ｍｍのマカロニ状）を充填した塔（径６０ｍｍ、高
さ１０００ｍｍ）に上向流でＬＶ１０ｍ／ｈ条件で通水
した。通水した後の処理水を回収し、オーシストの数を
測定し、表２に示した。通水後、充填材が水に浸かった
状態で下部から空気曝気して、充填材に補足された懸濁
物質をはずして、水と一緒に引き抜いた。このときの懸
濁物質を含む濃縮液（固形分濃度：１％）は１０Ｌであ
り、減容率は１／１００であった。この懸濁物質を含む
溶液にオゾン１ｍｇ／Ｌを１０分間通気して、殺菌処理
した。殺菌処理後のオーシストを分離して、ＰＩ排除法
でオーシストの生死を確認し、その結果を表２に示す。Example 2 Filtration treatment and backwashing were carried out under the same conditions as in Example 1 to obtain a separation membrane washing wastewater 1000 having an SS concentration of 100 mg / L.
L was obtained. An oocyst was added to the separation membrane washing wastewater, and the separation membrane washing wastewater contaminated with the oocyst was prepared. The number of oocysts in the separation membrane washing wastewater was measured, and the results are shown in Table 2. 30 mg / l of polyaluminum chloride was added to the separation wastewater from the washing of the separation membrane contaminated with oocysts, mixed to form aggregates, and then filled with a plastic filler (macaroni having a diameter of 4 mm and a length of 10 mm). (60 mm, height 1000 mm) in an upward flow at an LV of 10 m / h. The treated water after passing the water was collected, and the number of oocysts was measured. After passing the water, the filler was immersed in water, and air was aerated from below to remove suspended substances trapped in the filler and withdrawn with the water. At this time, the concentrated liquid (solid content concentration: 1%) containing the suspended substance was 10 L, and the volume reduction rate was 1/100. The solution containing the suspended substance was sterilized by passing 1 mg / L of ozone for 10 minutes. The oocysts after the sterilization treatment were separated, and the viability of the oocysts was confirmed by the PI exclusion method. The results are shown in Table 2.
【００２８】[0028]
【表２】 [Table 2]
【００２９】表２に示した結果から明らかなように、分
離膜洗浄排水中のオーシストは、凝集濾過分離後の充填
塔処理水中には含まれておらず、また凝集濾過分離した
懸濁物質中に移行したオーシストはオゾン殺菌処理によ
り死滅していることが分かる。As is evident from the results shown in Table 2, the oocysts in the separation membrane washing wastewater were not contained in the treated water in the packed tower after the coagulation filtration separation, and the oocysts in the suspended matter subjected to the coagulation filtration separation were not contained. It can be seen that the oocysts that have been transferred to have been killed by the ozone sterilization treatment.
【００３０】[0030]
【発明の効果】本発明方法により、分離膜洗浄排水から
懸濁物質を分離・濃縮し、得られた濃縮水を殺菌するこ
とにより、殺菌対象の処理量を低減することができ、殺
菌剤のコストを抑制し、殺菌効率がよくなる。また、原
水がクリプトスポリジウムのオーシスト等の病原性微生
物で汚染されていても、分離膜により除去されて、分離
膜洗浄排水中に移行したオーシスト等の病原性微生物を
効率的に死滅させることができ、再汚染を防止すること
ができる。また、懸濁物質を除去した後の分離膜洗浄排
水中には、オーシスト等の病原性微生物が含まれていな
いため、放流したり原水へ戻してもオーシストによる汚
染を回避できる。According to the method of the present invention, the suspended solids are separated and concentrated from the separation membrane washing wastewater, and the obtained concentrated water is sterilized. Costs are reduced and sterilization efficiency is improved. In addition, even if the raw water is contaminated with pathogenic microorganisms such as oocysts of Cryptosporidium, it can be efficiently killed by pathogenic microorganisms such as oocysts that have been removed by the separation membrane and migrated into the separation membrane washing wastewater. , Re-contamination can be prevented. In addition, since the pathogenic microorganisms such as oocysts are not contained in the separation membrane washing wastewater after removing the suspended matter, contamination by oocysts can be avoided even when the wastewater is discharged or returned to raw water.
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.6 識別記号 ＦＩ Ｃ０２Ｆ 1/38 Ｃ０２Ｆ 1/38 1/50 ５１０ 1/50 ５１０Ａ ５２０ ５２０Ｐ ５３１ ５３１Ｒ ５３１Ｐ ５５０ ５５０Ｈ ５６０ ５６０Ｅ ５６０Ｚ 1/52 1/52 Ｋ 1/76 1/76 Ａ 1/78 1/78 9/00 ５０２ 9/00 ５０２Ａ ５０２Ｄ ５０２Ｇ ５０２Ｐ ５０２Ｒ ５０２Ｎ ────────────────────────────────────────────────── ─── front page continued (51) Int.Cl. 6 identifications FI C02F 1/38 C02F 1/38 1/50 510 1/50 510A 520 520P 531 531R 531P 550 550H 560 560E 560Z 1/52 1/52 K 1/76 1/76 A 1/78 1/78 9/00 502 9/00 502A 502D 502G 502P 502R 502N
Claims (4)
浄化する方法において、濾過により懸濁物質が付着した
分離膜を洗浄した際に排出される洗浄排水中の懸濁物質
を分離・濃縮した後、分離した懸濁物質を含む濃縮水を
殺菌することを特徴とする分離膜洗浄排水の殺菌方法。1. A method for purifying raw water such as river water by filtration through a separation membrane, wherein the suspended matter in the washing wastewater discharged when the separation membrane to which the suspended matter adheres by filtration is washed out. A method for sterilizing separation membrane washing wastewater, comprising sterilizing concentrated water containing a suspended substance after concentration.
する請求項１に記載の分離膜洗浄排水の殺菌方法。2. The method according to claim 1, wherein the separation membrane is an ultrafiltration membrane.
方法が、遠心分離、凝集沈殿分離または濾過分離である
ことを特徴とする請求項１または請求項２に記載の分離
膜洗浄排水の殺菌方法。3. The separation membrane washing wastewater according to claim 1 or 2, wherein the method of separating and concentrating suspended substances in the washing wastewater is centrifugation, coagulation sedimentation separation or filtration separation. Sterilization method.
び紫外線照射法から選ばれる少なくとも１種の殺菌法で
あることを特徴とする請求項１ないし請求項３のいずれ
か１項に記載の分離膜洗浄排水の殺菌方法。4. The sterilization method according to claim 1, wherein the sterilization method is at least one selected from a heating method, an oxidizing agent addition method, and an ultraviolet irradiation method. Method of sterilization of wastewater for separation membrane washing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9260572A JPH1190432A (en) | 1997-09-25 | 1997-09-25 | Method for sterilizing wastewater of washing separation membrane |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9260572A JPH1190432A (en) | 1997-09-25 | 1997-09-25 | Method for sterilizing wastewater of washing separation membrane |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH1190432A true JPH1190432A (en) | 1999-04-06 |
Family
ID=17349822
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9260572A Pending JPH1190432A (en) | 1997-09-25 | 1997-09-25 | Method for sterilizing wastewater of washing separation membrane |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH1190432A (en) |
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|---|---|---|---|---|
| JP2006000729A (en) * | 2004-06-16 | 2006-01-05 | Japan Organo Co Ltd | Ship ballast water production method and apparatus |
| JP2007160242A (en) * | 2005-12-15 | 2007-06-28 | Japan Organo Co Ltd | Ballast water preparation apparatus, ship equipped with it, and ballast water preparation method |
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| WO2013071941A1 (en) * | 2011-11-17 | 2013-05-23 | Alexander Schluttig | Device and method for producing sterile water by means of a cross-flow liquid sterile filter |
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1997
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006000729A (en) * | 2004-06-16 | 2006-01-05 | Japan Organo Co Ltd | Ship ballast water production method and apparatus |
| JP2007160242A (en) * | 2005-12-15 | 2007-06-28 | Japan Organo Co Ltd | Ballast water preparation apparatus, ship equipped with it, and ballast water preparation method |
| JP2007236221A (en) * | 2006-03-06 | 2007-09-20 | Fuji Electric Systems Co Ltd | Method for separation of microorganism |
| US8137542B2 (en) | 2007-12-27 | 2012-03-20 | Kabushiki Kaisha Toshiba | Water treatment system |
| WO2013071941A1 (en) * | 2011-11-17 | 2013-05-23 | Alexander Schluttig | Device and method for producing sterile water by means of a cross-flow liquid sterile filter |
| WO2014141698A1 (en) * | 2013-03-12 | 2014-09-18 | パナソニック株式会社 | Liquid treatment method and liquid treatment device used therein |
| JP2014172021A (en) * | 2013-03-12 | 2014-09-22 | Panasonic Corp | Liquid treatment method and liquid treatment apparatus using the same |
| CN105189367A (en) * | 2013-03-12 | 2015-12-23 | 松下知识产权经营株式会社 | Liquid treatment method and liquid treatment device used therein |
| US9522829B2 (en) | 2013-03-12 | 2016-12-20 | Panasonic Intellectual Property Management Co., Ltd. | Liquid treatment method and liquid treatment device used therein |
| US10428500B2 (en) | 2015-05-15 | 2019-10-01 | Alexander Schluttig | Self-disinfecting drain trap having a coating |
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