JP3026023B2 - How to clean lakes - Google Patents
How to clean lakesInfo
- Publication number
- JP3026023B2 JP3026023B2 JP40201390A JP40201390A JP3026023B2 JP 3026023 B2 JP3026023 B2 JP 3026023B2 JP 40201390 A JP40201390 A JP 40201390A JP 40201390 A JP40201390 A JP 40201390A JP 3026023 B2 JP3026023 B2 JP 3026023B2
- Authority
- JP
- Japan
- Prior art keywords
- water
- lakes
- lake
- phosphorus
- fine bubbles
- 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
Classifications
-
- 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
Landscapes
- Aeration Devices For Treatment Of Activated Polluted Sludge (AREA)
- Removal Of Specific Substances (AREA)
- Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は湖沼等の浄化方法に関
し、より詳細には下水処理ラグーン、湖沼、池、用水
池、養魚池等 (以下、湖沼等と云う) の浄化方法に関す
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of purifying lakes and marshes, and more particularly to a method of purifying sewage treatment lagoons, lakes and marshes, ponds, irrigation ponds, fish ponds and the like (hereinafter referred to as lakes and marshes).
【０００２】[0002]
【従来の技術】湖沼等は不可避な自然的汚染源、たとえ
ば汚染降雨水、野鳥や魚類の排泄物、過剰な給餌、落葉
等によって水質が徐々に悪化することに加えて、特に人
為的に汚染源、たとえば生活排水の流入などがある場合
には水質悪化が急速に進行する。湖沼等のような閉鎖系
水域においては、生態系の自浄能力が上記のような原因
によって容易に低下し、水質の悪化につれて藻類の異常
発生や底泥の嫌気分解を招くことになる。2. Description of the Related Art Lakes and marshes are inevitable natural sources of pollution, such as polluted rainwater, excretion of wild birds and fish, excessive feeding, falling leaves, etc. For example, when there is an inflow of domestic wastewater, the water quality deteriorates rapidly. In closed water bodies such as lakes and marshes, the self-cleaning capacity of the ecosystem is easily reduced due to the above-mentioned causes, and as the water quality deteriorates, abnormal occurrence of algae and anaerobic decomposition of bottom mud are caused.
【０００３】かかる湖沼等の生態系のアンバランスとそ
れによる水質悪化を改善するため、イ. 人為的に置換水
を供給して水質を改善する方法、ロ. 底泥の浚渫、ハ.
高速回転スクリューによる完全混合型曝気方法、および
ニ. リン除去のために硫酸アルミニウム、ポリ塩化アル
ミニウムなどを添加する方法などが提案されている。In order to improve the imbalance of ecosystems such as lakes and marshes and the deterioration of water quality due to the imbalance, a. A method of artificially supplying replacement water to improve water quality, b. Dredging of bottom mud, c.
There have been proposed a complete mixing type aeration method using a high-speed rotating screw, and a method of adding aluminum sulfate, polyaluminum chloride and the like for removing phosphorus.
【０００４】[0004]
【発明が解決しようとする課題】イ. の方法は、置換水
を長期間にわたって供給する設備と、供給置換水に相当
する量の排水を導くための設備、たとえば下水道の設置
を必要とするうえに、置換水供給を中止すれば再び水質
の悪化がはじまる可能性があり、抜本的解決策とはなり
えない欠点があった。The method (a) requires equipment for supplying replacement water for a long period of time and equipment for guiding wastewater in an amount corresponding to the supply replacement water, for example, installation of a sewer. In addition, if the supply of replacement water is stopped, the water quality may start to deteriorate again, and there is a drawback that it cannot be a drastic solution.
【０００５】ロ. の方法もイ. と同様にあくまでも一時
的な対処療法にすぎず、生態系の根本的な改善は期待し
えない問題点があった。またハ. の方法は水生植物に対
して悪影響を与えたり、スクリューの高速回転による危
険性、景観上の問題、底泥の巻き上げ、分散を招く欠点
があった。更にニ. の方法は湖沼水の pＨが低下した
り、水酸化アルミニウムのフロックが生成し、これが圧
密されず汚泥量の増大を招く問題点があった。[0005] The method of (b) is, as in (a), only a temporary coping treatment, and there is a problem that fundamental improvement of the ecosystem cannot be expected. In addition, the method of (c) has a disadvantage that it has an adverse effect on aquatic plants, a danger due to a high-speed rotation of a screw, a problem in a landscape, a lifting of sediment and dispersion. Further, the method (2) has a problem that the pH of the lake water decreases and the flocs of aluminum hydroxide are formed, which are not compacted and cause an increase in the amount of sludge.
【０００６】本発明は一時的な対処療法ではなく、閉鎖
系水域の生態系の自浄能力を補助、強化することによ
り、水質悪化と生態系異状の悪循環サイクルを断つこと
により湖沼等を浄化する方法を提供することを目的とす
るものである。[0006] The present invention is not a temporary coping treatment but a method of purifying lakes and marshes by interrupting the vicious cycle of water quality deterioration and ecosystem abnormalities by assisting and enhancing the self-cleaning ability of ecosystems in closed water bodies. The purpose is to provide.
【０００７】[0007]
【課題を解決するための手段】上記目的を達成するため
に、本発明の湖沼等の浄化方法においては、湖沼等の底
泥上から水面に向けて微細気泡を２０〜４０ｃｍ／ｓｅ
ｃの速度で上昇させて湖沼水を好気化し、次いで該微細
気泡の上昇を継続しながらセルロース分解菌および／ま
たは、硫酸アルミニウム１８水塩０〜５０重量％、硫酸
カルシウム２水塩５０〜１００重量％、ホウ酸１〜２０
重量％、活性アルミナ０〜５重量％、およびドロマイト
０〜５重量％からなるリン固定化剤を湖沼等に供給する
ものである。In order to achieve the above-mentioned object, in the method for purifying lakes and marshes according to the present invention, fine bubbles are generated from the bottom mud of lakes and marshes to the water surface by 20 to 40 cm / sec.
and then aerosolizing the lake water at a rate of c, and then continuing to raise the microbubbles while cellulolytic bacteria and / or aluminum sulfate 18 hydrate 0-50% by weight, calcium sulfate dihydrate 50-100 Wt%, boric acid 1-20
A phosphorus immobilizing agent comprising, by weight, 0 to 5% by weight of activated alumina and 0 to 5% by weight of dolomite is supplied to a lake or the like.
【０００８】以下、本発明を図面にもとづき説明する。
図１および図２は湖沼等の底泥（ヘドロ）１の上に微細
気泡発生装置、たとえば、散気板２を設置し、矢印Ａ方
向から供給された空気を散気板２をを介して微細気泡３
として水面に向けて上昇させている状態を示す。微細気
泡３は図示のように直上する静かな気流、すなわち、２
０〜４０ｃｍ／ｓｅｃの速度で上昇する気流である。こ
の結果、湖沼水に矢印Ｂで示す静かな循環流を形成する
ことができる。Hereinafter, the present invention will be described with reference to the drawings.
FIGS. 1 and 2 show a microbubble generator, for example, a diffuser plate 2 installed on bottom mud (sludge) 1 of a lake or the like, and air supplied in the direction of arrow A is passed through the diffuser plate 2. Fine bubbles 3
Indicates a state of being raised toward the water surface. The microbubbles 3 have a quiet airflow that rises directly as shown in FIG.
It is an airflow that rises at a speed of 0 to 40 cm / sec. As a result, a quiet circulation flow indicated by arrow B can be formed in the lake water.
【０００９】また微細気泡を使用するので水中への酸素
溶解性を高めることもでき、かつ底泥上からの微細気泡
による静かな層流曝気が行なわれるので底泥の巻き上げ
や混合による湖沼水の底泥懸濁を生ずることもほとんど
ない。かかる微細気泡による曝気によって、静かな循環
水流Ｂが形成されるので、酸素に富んだ表面水と嫌気化
した底部水が入れ替り、底泥への酸素供給と底泥中のＨ
2Ｓ、ＣＯ2、ＮＨ3 等の有害ガスの大気中への放出と、
湖沼水の十分な好気化を達成することができる。Further, the use of fine bubbles can increase the solubility of oxygen in water, and the quiet laminar aeration by fine bubbles from above the bottom mud allows the lake water to be swirled and mixed with the bottom mud. There is almost no sediment suspension. The aeration by the fine bubbles forms a quiet circulating water flow B, so that the surface water rich in oxygen and the anaerobic bottom water are exchanged, and the oxygen supply to the bottom mud and the H in the bottom mud are performed.
Release of harmful gases such as 2 S, CO 2 , NH 3 into the atmosphere,
Sufficient aerobicization of lake water can be achieved.
【００１０】自然水系では少なくとも春秋の２回、水温
の上昇、低下によって表面水と底部水の逆転が生じ、酸
素に富んだ表面水と嫌気化した底部水が入れ替ると共
に、底泥への酸素供給と、微生物の活動を阻害する底泥
中の有害ガス(Ｈ2Ｓ、ＣＯ2、ＮＨ3等) の大気放出が生
ずる。In a natural water system, surface water and bottom water are reversed at least twice in the spring and fall due to the rise and fall of water temperature, so that oxygen-rich surface water and anaerobic bottom water are exchanged, and oxygen in the bottom mud is exchanged. Supply and atmospheric release of harmful gases (H 2 S, CO 2 , NH 3, etc.) in the sediment that hinder microbial activity occurs.
【００１１】本発明の微細気泡による上記曝気は、かか
る自然の自浄能力を強制的に繰り返し行なわせようとす
るものである。すなわち本発明における微細気泡は、酸
素を溶解したり、混合攪拌を目的とする水処理操作の曝
気とは異なり、表面水と底部水の逆転を主目的とするも
のであり、好ましくは散気板を使用すれば湖沼等の形状
に応じて最適配置が可能であり、水位が異なる湖沼等に
も好適に使用することができる。The aeration by the fine bubbles of the present invention is intended to forcibly repeat the natural self-cleaning ability. That is, the fine bubbles in the present invention dissolve oxygen or, unlike aeration in a water treatment operation for the purpose of mixing and stirring, the main purpose is to reverse the surface water and the bottom water, preferably a diffuser plate By using, it is possible to optimize the arrangement according to the shape of a lake or the like, and it can be suitably used for lakes and the like having different water levels.
【００１２】次に本発明においては、湖沼水が好気化し
た後に、セルロース分解菌および／またはリン固定剤を
湖沼水に散布、供給する。セルロース分解菌としては、
アスペルギルスオリザエ(Aspergillus cryzae)、トリコ
デルマ・ビリデ (Trichoderma viride) 、バシルス・セ
ルウス(Bacillus cereus) 、サッカロマイセス(Sacharo
myces S.P.) 等が用いられる。Next, in the present invention, after the lake water has been aerobicized, cellulolytic bacteria and / or a phosphorus fixing agent are sprayed and supplied to the lake water. As cellulolytic bacteria,
Aspergillus cryzae, Trichoderma viride, Bacillus cereus, Saccharomyces (Sacharomyces)
myces SP).
【００１３】かかるセルロース分解菌は好気性菌であ
り、好気的条件下では急速に底泥中の有機物を分解して
無機化すると共に自らは増殖する。この増殖した菌は原
生動物や後生動物の餌となり、これらは更に昆虫の幼虫
や稚魚の餌となり、これらはより大きな水中動物の餌と
なり、この水中動物の死がいは好気的条件下でセルロー
ス分解菌により分解され、生態系のバランスのとれた食
物連鎖が形成されるようになる。[0013] Such a cellulolytic bacterium is an aerobic bacterium. Under aerobic conditions, the organic matter in the bottom mud is rapidly decomposed, mineralized, and multiplied by itself. This multiplied fungus feeds on protozoa and metazoans, which in turn feed on insect larvae and fry, which feed on larger underwater animals, which die under water and degrade cellulose under aerobic conditions. It is broken down by fungi and forms a well-balanced food chain in the ecosystem.
【００１４】更に本発明においては、硫酸アルミニウ
ム、硫酸カルシウムおよびホウ散等からなるリン固定化
剤を湖沼等に散布する。水中での藻類の光合成活動を抑
制するためには、栄養源であるＣＯ2 、ＮＨ3 など窒素
源、およびリン酸などのリン源を減少することが有効で
ある。ＣＯ2 は曝気によって、また窒素源は酸化や曝気
による大気放出で軽減することができるが、リン源は曝
気によって除去、軽減することはできない。好気的条件
下では、リン酸は水中のカウシウムや他の金属イオンと
結合して底に沈澱し、藻類が利用できない状態になる
が、長い期間を必要とする。Further, in the present invention, a phosphorus immobilizing agent comprising aluminum sulfate, calcium sulfate, and borax is sprayed on lakes and the like. In order to suppress the photosynthetic activity of algae in water, it is effective to reduce nutrient sources such as nitrogen sources such as CO 2 and NH 3 and phosphorus sources such as phosphoric acid. CO 2 can be reduced by aeration and nitrogen sources can be reduced by oxidation or atmospheric release by aeration, whereas phosphorus sources cannot be removed or reduced by aeration. Under aerobic conditions, phosphoric acid binds to causium and other metal ions in water and precipitates at the bottom, leaving algae unusable, but requires a long period of time.
【００１５】そこで本発明においては、リンの固定を促
進するために、上記したリン固定化剤を使用するもので
ある。この固定化剤の組成は、下記のとおりである。 硫酸アルミニウム１８水塩 (硫酸バンド) ０〜５０ wt.％ 硫酸カルシウム２水塩 ５０〜１００wt.％ ホウ酸 １〜２０ wt.％ 活性アルミナ ０〜５ wt.％ ドロマイト ０〜５ wt.％ このリン酸固定化剤は、自然水中に通常存在しているＣ
ａとＡｌを使用し、安全で取扱い容易な粉末状で使用す
ることができ、硫酸カルシウムやホウ酸の添加によって
湖沼水の pＨに影響を与えない緩衝性が付与されてい
る。Therefore, in the present invention, the aforementioned phosphorus immobilizing agent is used to promote the immobilization of phosphorus. The composition of this immobilizing agent is as follows. Aluminum sulfate 18 hydrate (sulfate band) 0-50 wt.% Calcium sulfate dihydrate 50-100 wt.% Boric acid 1-20 wt.% Activated alumina 0-5 wt.% Dolomite 0-5 wt.% This phosphorus The acid fixing agent is a C which is normally present in natural water.
a and Al can be used in a powder form that is safe and easy to handle, and has a buffering property that does not affect the pH of lake water by adding calcium sulfate or boric acid.
【００１６】かかるリン固定化剤の使用によれば、水酸
化アルミニウムのフロック形成を極力抑制しながら、リ
ン酸アルミニウム、リン酸カルシウムや酸化カルシウム
の形成を促進することができ、従って形成されたリン酸
塩やリン酸の吸着剤として酸化アルミニウムが作用し、
リン酸を含む酸化アルミニウムは容易に湖沼等の底に沈
澱する。According to the use of the phosphorus immobilizing agent, the formation of aluminum phosphate, calcium phosphate and calcium oxide can be promoted while minimizing the floc formation of aluminum hydroxide. Aluminum oxide acts as an adsorbent for
Aluminum oxide containing phosphoric acid easily precipitates at the bottom of a lake or the like.
【００１７】なお硫酸アルミニウムの代りに粉末パック
(粉末ポリ塩化アルミニウム) を用いたところ、同様な
効果が認められた。以下本発明の実施例を述べる。In addition, a powder pack is used instead of aluminum sulfate.
(Powder polyaluminum chloride) showed similar effects. Hereinafter, embodiments of the present invention will be described.
【００１８】[0018]
【実施例】 対 象 池： 面 積 １２００ｍ2 容 量 １８２０ｍ2 平均水深 1.５ｍ 設置機器： ３０cm2 の散気板 (気孔径４００ミクロン) ４個 運転条件： 散気板１個当り９０Ｌ／分の圧縮空気を供給 薬剤添付： 下記に示す薬剤を運転開始２週間後に散布した。[Example] Target pond: Area 1200m 2 Capacity 1820m 2 Average water depth 1.5m Installation equipment: 30cm 2 diffuser plate (pore diameter 400 microns) 4 operation conditions: 90L / min per diffuser plate The following chemicals were sprayed 2 weeks after the start of operation.
【００１９】 硫酸アルミニウム１８水塩 １５ wt.％ 硫酸カルシウム２水塩 ７５ wt.％ ホウ酸 ２ wt.％ 活性アルミナ ２ wt.％ ドロマイト ２ wt.％ その他不活性物 ４ wt.％ なお薬剤は１回当り５０kg使用し、初回より４か月ごと
に散布した。Aluminum sulfate 18 hydrate 15 wt.% Calcium sulfate dihydrate 75 wt.% Boric acid 2 wt.% Activated alumina 2 wt.% Dolomite 2 wt.% Other inerts 4 wt.% The chemical is 1 50 kg was used per time, and sprayed every four months from the first time.
【００２０】上記のように操作したところ、下記の結果
を得た。 イ. 池底部のＯＲＰは±０mVであったのに対し、本発明
の方法で浄化したところ、＋５０mV程度となり、ＤＯも
５mg／Ｌ以上となった。 ロ. 毎年夏期には藍藻類が増殖して池面を緑色化してい
たが、本発明を適用したところ薄い褐色を呈して、藍藻
類の増殖をある程度抑制できた。一方、隣にある、本発
明を適用しない８３００m2の池では、例年どおり池面が
緑色となり、アオコの浮遊が認められた。The above operation resulted in the following results. B. The ORP at the bottom of the pond was ± 0 mV, but when purified by the method of the present invention, the ORP was about +50 mV, and the DO was 5 mg / L or more. B. Every summer, cyanobacteria grew and the pond surface turned green, but when the present invention was applied, it showed a pale brown color and growth of cyanobacteria could be suppressed to some extent. On the other hand, in the adjacent pond of 8300 m 2 to which the present invention is not applied, the pond surface turned green as usual, and floating of blue-green algae was observed.
【００２１】なお、池水の植物プランクトンを計数した
ところ、表１の結果を得た。When the phytoplankton in the pond was counted, the results shown in Table 1 were obtained.
【表１】 また、本発明における薬剤を散布した前後の水質は表２
のとおりであり、 pＨの変化は小さく、またリン濃度は
低下した。[Table 1] In addition, the water quality before and after the application of the drug in the present invention is shown in Table 2.
The change in pH was small and the phosphorus concentration was reduced.
【００２２】[0022]
【表２】 表２から明らかなように池水は透明度が増加し、清澄に
なり、池内の鯉が周辺より見えるようになった。[Table 2] As is clear from Table 2, the pond water increased in transparency, became clear, and the carp in the pond became visible from the surroundings.
【００２３】なお、池には多数の鯉が生息しており、ま
た餌をやったり、雨水の流入等外部からの汚濁負荷があ
るため、定期的にリン固定剤を散布した。Since a large number of carps inhabit the pond and there is an external pollution load such as feeding and rainwater inflow, a phosphorus fixing agent was sprayed periodically.
【００２４】[0024]
【発明の効果】以上述べたように本発明によれば、湖沼
等の底泥上から微細気泡を上昇させるので、水中への酸
素溶解性を高め、底泥の巻き上げや混合を防止しながら
静かな層流曝気によって湖沼等を好気化することができ
る。また、この層流曝気を行ないながらセルロース分解
菌を供給するので、好気的条件下で底泥を分解して生態
系のバランスと食物連鎖の形成をより促進することがで
きる。As described above, according to the present invention, fine bubbles are raised from the bottom mud of a lake or the like, so that the solubility of oxygen in water is enhanced, and the bottom mud is prevented from being rolled up and mixed while being quiet. Lakes and marshes can be aerobically aerated by such laminar aeration. In addition, since the cellulose-decomposing bacteria are supplied while performing the laminar flow aeration, the bottom mud is decomposed under aerobic conditions, whereby the balance of the ecosystem and the formation of a food chain can be further promoted.
【００２５】更に、層流曝気を行ないながらリン固定化
剤を散布するので、水酸化アルミニウムのフロック形成
を極力抑制しながらリン酸塩の形成によるリンの固定化
を促進することができる。この結果本発明によれば、湖
沼等の閉鎖水域における生態系の自浄能力の強化によっ
て湖沼等を浄化することができる。Further, since the phosphorus immobilizing agent is sprayed while performing laminar flow aeration, it is possible to promote the immobilization of phosphorus by the formation of phosphate while minimizing the floc formation of aluminum hydroxide. As a result, according to the present invention, lakes and the like can be purified by enhancing the self-cleaning ability of the ecosystem in a closed water area such as a lake and the like.
【図１】本発明の浄化方法の実施状況を示す断面説明図
である。FIG. 1 is an explanatory cross-sectional view showing an implementation state of a purification method of the present invention.
【図２】本発明の浄化方法の実施状況を示す平面説明図
である。FIG. 2 is an explanatory plan view showing an implementation state of the purification method of the present invention.
１ 底泥 ３ 微細気泡の上昇流 1 bottom mud 3 upward flow of fine bubbles
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 昭63−240989（ＪＰ，Ａ) 特開 昭58−84094（ＪＰ，Ａ) 特開 昭52−89243（ＪＰ，Ａ) (58)調査した分野(Int.Cl.7，ＤＢ名) C02F 7/00 C02F 1/58 C02F 3/34 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-63-240989 (JP, A) JP-A-58-84094 (JP, A) JP-A-52-89243 (JP, A) (58) Field (Int.Cl. 7 , DB name) C02F 7/00 C02F 1/58 C02F 3/34
Claims (2)
泡を２０〜４０ｃｍ／ｓｅｃの速度で上昇させて湖沼水
を好気化し、次いで該微細気泡の上昇を継続しながらセ
ルロース分解菌および／または、硫酸アルミニウム１８
水塩０〜５０重量％、硫酸カルシウム２水塩５０〜１０
０重量％、ホウ酸１〜２０重量％、活性アルミナ０〜５
重量％、およびドロマイト０〜５重量％からなるリン固
定化剤を湖沼等に供給することを特徴とする湖沼等の浄
化方法。1. A method of increasing the rate of fine bubbles at a rate of 20 to 40 cm / sec from the bottom mud of a lake or the like toward the water surface to aerobicize the lake water, and then continuing the rise of the fine bubbles to reduce the cellulolytic bacteria. And / or aluminum sulfate 18
Water salt 0 to 50% by weight, calcium sulfate dihydrate 50 to 10
0% by weight, boric acid 1-20% by weight, activated alumina 0-5
A method for purifying lakes and the like, characterized in that a phosphorus fixing agent consisting of 0 wt.
８水塩の代わりに粉末ポリ塩化アルミニウムを用いてな
る請求項１記載の湖沼等の浄化方法。2. The method according to claim 1, wherein the phosphorus fixing agent is aluminum sulfate 1
2. The method for purifying lakes and marshes according to claim 1, wherein powder polyaluminum chloride is used instead of octahydrate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP40201390A JP3026023B2 (en) | 1990-12-13 | 1990-12-13 | How to clean lakes |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP40201390A JP3026023B2 (en) | 1990-12-13 | 1990-12-13 | How to clean lakes |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04210298A JPH04210298A (en) | 1992-07-31 |
| JP3026023B2 true JP3026023B2 (en) | 2000-03-27 |
Family
ID=18511821
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP40201390A Expired - Lifetime JP3026023B2 (en) | 1990-12-13 | 1990-12-13 | How to clean lakes |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3026023B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6043913B1 (en) * | 2015-07-15 | 2016-12-14 | 株式会社サンセイアールアンドディ | Game machine |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2790768B2 (en) * | 1993-10-29 | 1998-08-27 | 鹿島建設株式会社 | How to install a bubble generator |
| JP2590426B2 (en) * | 1994-03-16 | 1997-03-12 | 建設省土木研究所長 | How to Prevent the Growth of Floating Algae in Irie Waters |
| JPH0852498A (en) * | 1994-08-11 | 1996-02-27 | Ube Chem Ind Co Ltd | Method for removing water-bloom and for suppressing its abnormal generation |
| JP6258277B2 (en) * | 2014-10-15 | 2018-01-10 | アクアサービス株式会社 | Water purification method and water purification system |
-
1990
- 1990-12-13 JP JP40201390A patent/JP3026023B2/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6043913B1 (en) * | 2015-07-15 | 2016-12-14 | 株式会社サンセイアールアンドディ | Game machine |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH04210298A (en) | 1992-07-31 |
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