JPH0337994B2 - - Google Patents
Info
- Publication number
- JPH0337994B2 JPH0337994B2 JP62218259A JP21825987A JPH0337994B2 JP H0337994 B2 JPH0337994 B2 JP H0337994B2 JP 62218259 A JP62218259 A JP 62218259A JP 21825987 A JP21825987 A JP 21825987A JP H0337994 B2 JPH0337994 B2 JP H0337994B2
- Authority
- JP
- Japan
- Prior art keywords
- water
- blue
- green algae
- tank
- air
- 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.)
- Expired - Lifetime
Links
Landscapes
- Physical Water Treatments (AREA)
Description
（産業上の利用分野）
本発明は、湖沼等の用水中に発生するアオコ
（水中に繁殖して水全体を緑色に彩る微小な藻類）
に対する良好なる除去目的を達成し、依つて、ア
オコ発生に基づく各種用水としての使用の不適格
性と言うような事態発生の絶無化を図つたことを
特徴とするものである。
（従来の技術）
アオコは水中に微細な状態で浮遊し、常に光合
成され増殖されており、その除去の方法は極めて
困難とされている。
従来、水利用に際しては、自然のまま利用する
か、接触材を使用した生物処理、砂濾過に依る物
理処理等で対処してきたが、問題解決まで至つて
いない。
また、特開昭58−146489号公報に掲載された
「水中浮遊微生物の回収濃縮方法」がある。これ
は、アオコ等の水中浮遊微生物を含んだ水と、加
圧されかつ微細気泡を含んだ水とを、同一配管内
に合流させ、然る後、これをスカム回収タンク
（本発明に於ける浮上分離槽に該当する）に導き、
前記合流に基づき水中浮遊微生物に微細空気を付
着させ、当該タンク内を上昇させるように成した
ものある。
然し乍ら、このようにアオコ等の水中浮遊微生
物を含んだ水と、加圧されかつ微細気泡を含んだ
水とを、同一配管内に合流させた場合、水中浮遊
微生物自体が加圧され、内部に包含する空気泡が
潰され、スカム回収タンク内に導かれた後も、水
中浮遊微生物の上昇がしにくいと言うような問題
が伴つた。
（発明が解決しようとする問題点）
湖沼等取水源に於けるアオコの発生は、夏期の
４箇月〜５箔月の期間に限られ、水田に利用する
程度であれば大きな問題ではなかつた。処が、現
在では、新鮮野菜、果実園等への水補給、生活用
水として利用されるに至つており、従つて、アオ
コに依る商品価値の低下、飲料水として臭気、色
度等多くの問題が存在し、充分なる利用が成され
ていないのが現状である。
換言すると、湖沼等に於ての富栄養化が進にし
たがい、アオコが発生し易くなり、水凄生物への
影響ばかりでなく、アオコが繁殖した用水を田畑
に利用した場合、農作物、園芸品、果実等に甚大
な被害を与えることとなる。
現在、公共機関が用水路網を施設し、需要家に
各種用水を著しく廉価に提供しているが、実際に
は、アオコの問題に依り、限られた範囲でしか利
用されていないと言うのが実情である。
本発明は、大量に自然発生するアオコの除去目
的が著しく容易に達成化されるように成し、依つ
て、上述した如き従来に於ける問題点の解決化を
図つたことを特徴とするものである。
そして、前記特開昭58−146489号公報に掲載さ
れた「水中浮遊微生物の回収濃縮方法」において
生じた前記のような問題点も解消する新規なアオ
コ除去方法を提供するものである。
（問題点を解決するための手段）
本発明は、アオコが繁殖した原水と、３〜４
Kg／cm2程度まで加圧された空気混合水とを、夫々
別の経路を経て、無圧状態の浮上分離槽内に導
き、当該アオコが繁殖した原水と空気混合水との
浮上分離槽内での接触に基づき、空気混合水中の
微細気泡を、原水中のアオコに接触付着させ、こ
れに依りアオコの見掛け比重を小さくして水面に
浮上させ、然る後、当該浮上アオコをスラツジと
して除去するように成したことを特徴とする湖沼
等に於ける用水のアオコ除去方法に係るものであ
る。
（作用）
第１図は本発明に係る方法を実施するための装
置を示すフローシートであつて、アオコを含有す
る原水は、原水槽１から取水されると共に、計量
槽２を経て凝集混和槽３に導かれる。ここで、凝
集剤貯留槽４に収容の凝集剤と混和され、浮上分
離槽５に移送される。尚、このような調整処理は
本発明の要部ではない。
上述した凝集混和槽３を経た原水は、浮上分離
槽５の下部ホツパー部に於て、加圧溶解された微
細気泡と接触混合され、フロツクとなつて槽上部
に浮上分離される。浮上し圧密されたスラツジは
掻寄機９により系外に取り出されて、スラツジピ
ツト１０を経て外部に除外されることとなる。
尚、加圧用水は浮上分離槽中間部（アオコが除
去された処理水）から循環ポンプ６に依り取り出
された処理水は、コンプレツサー７に依り供給さ
れた圧縮空気とラインミキサー８に依り混合され
て加圧槽１１に圧入される。圧入された空気混合
水は、３〜４Kg／cm2程度まで加圧される。この条
件のもとで空気はミクロン単位まで溶解され、処
理水と共に浮上分離槽５に導かれる。然る後、無
圧状態の槽内に放出される。放出された微細空気
はアオコと結合し、フロツクとなり水面に集積
し、スラツジとして取り出される。
一方、上述した如き系路に基づきアオコが除去
された処理水は、浮上分離槽中間部の清澄分離ゾ
ーンに依り集水される。処理水は各種用水として
利用される。
（実施例）
第１図に示す装置を用いた本発明方法の実施例
に依るアオコ除去率及び濁度除去率を示せば、下
記の表に示す通りである。
(Industrial Application Field) The present invention is directed to algal blooms (microscopic algae that breed in water and color the entire water green) that occur in water such as lakes and marshes.
It is characterized by achieving the objective of good removal of blue-green algae, thereby eliminating the occurrence of situations where the water becomes unsuitable for use as water for various purposes due to the occurrence of blue-green algae. (Prior Art) Blue-green algae floats in water in a fine state and is constantly photosynthesized and multiplied, making it extremely difficult to remove them. Conventionally, water has been used in its natural state, biological treatment using contact materials, physical treatment using sand filtration, etc., but the problem has not been solved. There is also a ``method for collecting and concentrating microorganisms suspended in water'' published in Japanese Patent Application Laid-open No. 146489/1989. In this process, water containing airborne microorganisms such as blue-green algae and water that is pressurized and contains microbubbles are combined in the same pipe, and then this is transferred to a scum collection tank (in the present invention). (corresponds to a flotation tank),
There is a system in which fine air is attached to microorganisms floating in the water based on the above-mentioned merging, and the microorganisms floating in the water are caused to rise in the tank. However, when water containing microorganisms suspended in the water such as blue-green algae and water that is pressurized and contains microbubbles are combined in the same pipe, the microorganisms suspended in the water themselves become pressurized and Even after the air bubbles contained in the scum were crushed and introduced into the scum collection tank, there were problems such as difficulty in raising the floating microorganisms in the water. (Problems to be Solved by the Invention) The occurrence of blue-green algae in water intake sources such as lakes and marshes is limited to a period of 4 to 5 months in summer, and is not a major problem if the water is used for rice fields. However, it is now used as water supply for fresh vegetables, fruit gardens, etc., and as water for daily life.As a result, there are many problems such as reduction in product value due to blue-green algae, odor, and chromaticity of drinking water. However, the current situation is that it is not fully utilized. In other words, as the eutrophication of lakes and marshes progresses, algae blooms become more likely to occur, which not only has an impact on water-producing organisms, but also damages agricultural products and gardening products when water in which algae blooms is used for fields. , causing severe damage to fruits, etc. Currently, public institutions are constructing irrigation canal networks and providing various types of water to consumers at extremely low prices, but in reality, due to the problem of blue-green algae, it is only used to a limited extent. This is the reality. The present invention is characterized in that the purpose of removing blue-green algae that occurs naturally in large quantities can be achieved with great ease, and that the above-mentioned problems in the prior art have been solved. It is. The present invention also provides a novel method for removing blue-green algae, which solves the above-mentioned problems that occurred in the "Method for collecting and concentrating microorganisms suspended in water" published in JP-A-58-146489. (Means for solving the problem) The present invention provides raw water in which blue-green algae have grown,
The air-mixed water pressurized to about Kg/ cm2 is guided into the unpressurized flotation tank through separate routes, and the raw water in which the blue-green algae has grown and the air-mixed water are separated into the flotation tank. Based on the contact, the microbubbles in the air-mixed water contact and adhere to the algae in the raw water, which reduces the apparent specific gravity of the algae and causes it to float to the water surface, and then removes the floating algae as sludge. This invention relates to a method for removing blue-green algae from irrigation water in lakes and marshes, which is characterized by the following. (Function) FIG. 1 is a flow sheet showing an apparatus for carrying out the method according to the present invention, in which raw water containing blue-green algae is taken from a raw water tank 1, passes through a measuring tank 2, and then passes through a coagulation mixing tank. Guided by 3. Here, it is mixed with the flocculant stored in the flocculant storage tank 4 and transferred to the flotation separation tank 5. Note that such adjustment processing is not an essential part of the present invention. The raw water that has passed through the above-mentioned flocculation mixing tank 3 is brought into contact with the pressurized and dissolved microbubbles in the lower hopper section of the flotation separation tank 5, and is floated and separated in the upper part of the tank as flocs. The floated and consolidated sludge is taken out of the system by a scraper 9, and is removed to the outside via a sludge pit 10. The pressurized water is taken out from the middle part of the flotation tank (treated water from which blue-green algae has been removed) by a circulation pump 6, and the treated water is mixed with compressed air supplied by a compressor 7 by a line mixer 8. and is press-fitted into the pressurized tank 11. The injected air-mixed water is pressurized to about 3 to 4 kg/cm 2 . Under these conditions, air is dissolved down to the micron level and is led to the flotation separation tank 5 together with the treated water. Thereafter, it is discharged into a pressureless tank. The released fine air combines with blue-green algae, becomes flocs, accumulates on the water surface, and is taken out as sludge. On the other hand, the treated water from which blue-green algae has been removed based on the above-mentioned system is collected by the clarification separation zone in the middle part of the flotation tank. The treated water is used for various purposes. (Example) The following table shows the blue-green algae removal rate and turbidity removal rate according to an example of the method of the present invention using the apparatus shown in FIG.
【表】
上記表のデーターが示すように、特殊な凝集剤
（例えばポリ塩化アルミニユーム）を使用するこ
とに依り、潅漑用水としては、凝集剤５mg／、
循環流量0.1Qでアオコ除去率63％、濁度除去率
78％程度となる。これは実際の使用上何等問題を
生じ得ないものである。尚、高級処理の必要な飲
料水については、凝集剤及び循環流量の調整に依
り、アオコ除去率92％、濁度除去率94％以上が望
める。これに後処理として、「濾過装置」を設置
することに依り、飲料水として利用することが出
来る。
浮上分離で最大の特徴は、アオコの臭いが除去
出来ることである。また、濾過行程に於ての目詰
まりが無くなることである。換言すれば、従来ア
オコの存在により、各種用水として全く不適当と
されていた原水であつても、本発明方法の実施に
依り、使用可能とするように浄化することが出来
るわけである。
（発明の効果）
本発明は、アオコが繁殖した原水と、３〜４
Kg／cm2程度まで加圧された空気混合水とを、夫々
別の経路を経て、無圧状態の浮上分離槽内に導
き、当該アオコが繁殖した原水と空気混合水との
浮上分離槽内での接触に基づき、空気混合水中の
微細気泡を、原水中のアオコに接触付着させ、こ
れに依りアオコの見掛け比重を小さくして水面に
浮上させ、然る後、当該浮上アオコをスラツジと
して除去するように成したから、従来アオコの存
在に基づき各種用水として全く不適当とされた原
水であつても、容易かつ迅速に当該アオコの除
去、すなわち、原水浄化が成されることとなる。
換言すると、含有アオコの存在に基づき、水凄
生物への影響ばかりでなく、アオコが繁殖した用
水を田畑に利用した場合、農作物、園芸品、果実
等に甚大な被害を与えてしまうと言うような従来
に於ける問題点は、本発明方法の実施に基づき全
く解消化することとなる。
結局、従来アオコ含有に基づき到底使用に適さ
なかつた原水であつても、本発明方法の実施に依
るアオコ除去に基づき使用可能とするように浄化
することが出来るから、本発明方法は、各種用水
の管理上もたらす効果は著しいものがあり、その
実施価値はとみに高いものがある。
更に本発明は、アオコが繁殖した原水と、３〜
４Kg／cm2程度まで加圧された空気混合水とを、
夫々別の経路を経て、無圧状態の浮上分離槽内に
導くように成したから、例えば、前記した特開昭
58−146489号公報に掲載された「水中浮遊微生物
の回収濃縮方法」のように、アオコ等の水中浮遊
微生物を含んだ水と、加圧されかつ微細気泡を含
んだ水とを、同一配管内に合流させたものにおい
て生じた、水中浮遊微生物自体が加圧され、内部
に包含する空気泡が潰され、スカム回収タンク内
に導かれた後も、水中浮遊微生物の上昇がしにく
いと言うような問題発生は、本発明にあつては全
く解消化される。[Table] As shown in the data in the table above, by using a special flocculant (for example, polyaluminum chloride), 5 mg of flocculant/water for irrigation can be used.
Blue-green algae removal rate 63% and turbidity removal rate with circulation flow rate 0.1Q
It will be around 78%. This does not cause any problem in actual use. For drinking water that requires high-grade treatment, a blue-green algae removal rate of 92% or more and a turbidity removal rate of 94% or more can be expected by adjusting the flocculant and circulation flow rate. By installing a ``filtration device'' as post-processing, this water can be used as drinking water. The biggest feature of flotation separation is that it can remove the odor of blue-green algae. Furthermore, clogging in the filtration process is eliminated. In other words, even raw water that was conventionally considered to be completely unsuitable for various uses due to the presence of blue-green algae can be purified to make it usable by implementing the method of the present invention. (Effect of the invention) The present invention provides raw water in which blue-green algae has grown,
The air-mixed water pressurized to about Kg/ cm2 is guided into the unpressurized flotation tank through separate routes, and the raw water in which the blue-green algae has grown and the air-mixed water are separated into the flotation tank. Based on the contact, the microbubbles in the air-mixed water contact and adhere to the algae in the raw water, which reduces the apparent specific gravity of the algae and causes it to float to the water surface, and then removes the floating algae as sludge. As a result, even in raw water that has been considered completely unsuitable for various uses due to the presence of blue-green algae, the blue-green algae can be easily and quickly removed, that is, the raw water can be purified. In other words, based on the presence of blue-green algae, it is said that not only does it have an impact on living creatures, but if water in which blue-green algae has grown is used in fields, it can cause severe damage to crops, garden products, fruits, etc. These conventional problems can be completely eliminated by implementing the method of the present invention. After all, even raw water that was conventionally unsuitable for use due to the presence of blue-green algae can be purified to make it usable by removing blue-green algae by carrying out the method of the present invention. The effects it brings on management are significant, and the value of its implementation is particularly high. Furthermore, the present invention provides raw water in which blue-green algae have grown, and
With air-mixed water pressurized to around 4Kg/ cm2 ,
For example, the above-mentioned Japanese Patent Laid-Open Publication No.
58-146489, water containing microorganisms suspended in water such as blue-green algae and water containing pressurized microbubbles are mixed in the same pipe. The airborne microorganisms generated in the scum are pressurized, the air bubbles contained inside are crushed, and even after being led into the scum collection tank, the airborne microorganisms in the water are difficult to rise. This problem can be completely eliminated by the present invention.
第１図は本発明方法の実施に用いる装置の一例
を示すフローシートである。
１……原水槽、２……計量槽、３……凝集混和
槽、４……凝集剤貯留槽、５……浮上分離槽、６
……循環ポンプ、７……コンプレツサー、８……
ラインミキサー、９……スラツジ掻寄機、１０…
…スラツジピツト、１１……加圧槽。
FIG. 1 is a flow sheet showing an example of an apparatus used to carry out the method of the present invention. 1... Raw water tank, 2... Measuring tank, 3... Coagulation mixing tank, 4... Flocculant storage tank, 5... Flotation separation tank, 6
...Circulation pump, 7...Compressor, 8...
Line mixer, 9...Sludge scraper, 10...
... Sludge pit, 11... Pressurized tank.
Claims (1)
まで加圧された空気混合水とを、夫々別の経路を
経て、無圧状態の浮上分離槽内に導き、当該アオ
コが繁殖した原水と空気混合水との浮上分離槽内
での接触に基づき、空気混合水中の微細気泡を、
原水中のアオコに接触付着させ、これに依りアオ
コの見掛け比重を小さくして水面に浮上させ、然
る後、当該浮上アオコをスラツジとして除去する
ように成したことを特徴とする湖沼等に於ける用
水のアオコ除去方法。1. Raw water in which blue-green algae have grown and air-mixed water pressurized to about 3 to 4 kg/cm 2 are guided through separate routes into a flotation separation tank under no-pressure condition. Based on the contact between the air-mixed water and the flotation tank, fine bubbles in the air-mixed water are
In lakes and marshes, the method is applied by contacting and adhering to blue-green algae in raw water, thereby reducing the apparent specific gravity of the blue-green algae and causing it to float to the water surface, and then removing the floating blue-green algae as sludge. How to remove blue-green algae from irrigation water.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21825987A JPS6463091A (en) | 1987-09-01 | 1987-09-01 | Method for removing water-bloom of service water in lake, pond or the like |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21825987A JPS6463091A (en) | 1987-09-01 | 1987-09-01 | Method for removing water-bloom of service water in lake, pond or the like |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6463091A JPS6463091A (en) | 1989-03-09 |
| JPH0337994B2 true JPH0337994B2 (en) | 1991-06-07 |
Family
ID=16717073
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP21825987A Granted JPS6463091A (en) | 1987-09-01 | 1987-09-01 | Method for removing water-bloom of service water in lake, pond or the like |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6463091A (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0764987A (en) * | 1993-08-24 | 1995-03-10 | Nec Corp | Japanese word processor |
| JP3410944B2 (en) * | 1997-12-24 | 2003-05-26 | 真道 菊池 | Sterilization method and seawater sterilization ice maker |
| KR100330493B1 (en) * | 1999-11-20 | 2002-04-09 | 주대성 | An Intake Water Purifying System |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS505818A (en) * | 1973-05-21 | 1975-01-22 | ||
| JPS5282848A (en) * | 1975-12-30 | 1977-07-11 | Stanley Electric Co Ltd | Method of pressurized floating separation |
| JPS543964A (en) * | 1977-06-10 | 1979-01-12 | Shinko Pfaudler | Automatic operation method of sludge floating concentrating device and its device |
| JPS58146489A (en) * | 1982-02-25 | 1983-09-01 | Osaka Sosenjo:Kk | Method for recoverying and concentrating underwater suspended microbes |
| US4491033A (en) * | 1983-06-23 | 1985-01-01 | Usm Corporation | Double eccentric wave generator arrangement |
-
1987
- 1987-09-01 JP JP21825987A patent/JPS6463091A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6463091A (en) | 1989-03-09 |
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