JP4454343B2 - Wastewater treatment method for laver - Google Patents

Wastewater treatment method for laver Download PDF

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JP4454343B2
JP4454343B2 JP2004065258A JP2004065258A JP4454343B2 JP 4454343 B2 JP4454343 B2 JP 4454343B2 JP 2004065258 A JP2004065258 A JP 2004065258A JP 2004065258 A JP2004065258 A JP 2004065258A JP 4454343 B2 JP4454343 B2 JP 4454343B2
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wastewater
laver
koji mold
aeration
aspergillus
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JP2005254040A (en
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洪武 李
和宏 立川
時彦 丸山
勲 堀内
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株式会社応微研
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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02WCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W10/00Technologies for wastewater treatment
    • Y02W10/10Biological treatment of water, waste water, or sewage

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Description

本発明は、海苔の製造工程における排水から汚濁成分を取り除くための海苔の排水処理方法に関する。   The present invention relates to a laver wastewater treatment method for removing pollutant components from wastewater in a laver production process.

従来から海苔の養殖加工場では、海苔を製造する際に多量の白濁あるいはさらに赤く着色された汚濁排水が出ることが問題になっている。従来、このような汚濁排水を浄化する方法として、例えば、下記特許文献1に開示されているような活性炭を用いて浄化する方法が知られている。   Conventionally, nori culturing plants have a problem of producing a large amount of white turbidity or more polluted wastewater colored red when producing nori. Conventionally, as a method of purifying such polluted wastewater, for example, a method of purifying using activated carbon as disclosed in Patent Document 1 below is known.

この方法は、海苔製造用排水を直接用水路に流すことなく、前処理工程としてフィルタ、活性炭、骨炭等により洗浄して脱色した後、逆浸透膜式海水淡水化装置に送り込むものである。   In this method, wastewater for producing seaweed is not passed directly to the water channel, but is washed with a filter, activated carbon, bone charcoal or the like as a pretreatment step and then sent to a reverse osmosis membrane seawater desalination apparatus.

しかしながら、上記の活性炭を用いた方法では、装置が複雑となるために操作が煩雑でコストが掛かる他、汚濁物質を吸着させたフィルタ等を処理しなければならない等の問題があった。   However, the above-described method using activated carbon has a problem that the apparatus is complicated and the operation is complicated and expensive, and a filter or the like adsorbing a pollutant must be processed.

特開平8−197050号公報JP-A-8-197050

そこで、本発明の課題は、海苔を製造する際に流出する排水から汚濁成分を簡易な方法で十分に取り除くことができる排水処理方法を提供することである。   Then, the subject of this invention is providing the waste water treatment method which can fully remove a pollutant component from the waste_water | drain which flows out when manufacturing laver by a simple method.

上記課題を解決するため、本発明に係る海苔の排水処理方法は、海苔の製造工程から出る排水に麹菌を添加する工程と、この麹菌が添加された排水に酸素を供給する曝気工程とを備え、排水中に含まれる汚濁成分を取り除くことを特徴とする。前記の麹菌を添加する工程は曝気工程の前に設けられる場合と曝気工程の中に含まれる場合とがある。即ち、排水を曝気する前に麹菌を添加してもよいし、排水の曝気と略同時に添加してもよい。   In order to solve the above-mentioned problems, a method for treating wastewater from laver according to the present invention includes a step of adding koji mold to the wastewater from the production process of laver and an aeration process for supplying oxygen to the wastewater to which the koji mold is added. It is characterized by removing pollutant components contained in waste water. The step of adding the koji mold may be provided before the aeration step or may be included in the aeration step. That is, the koji mold may be added before the waste water is aerated, or may be added almost simultaneously with the aeration of the waste water.

海苔の製造工程から出る排水中には種々雑多の懸濁物質が含まれるので、曝気工程の前に、排水中の懸濁物質を除去する沈殿処理工程を設け、懸濁物質をある程度沈殿させた後の上澄みを曝気した方が、曝気による浄化効率が大きくなる。しかしながら、本発明では麹菌によっても洗浄排水中の懸濁物質が除去されるので、沈殿工程を設けることなく、洗浄工程の直後の洗浄排水に麹菌を加えて曝気処理することも可能である。   Since the wastewater from the laver production process contains various miscellaneous suspended solids, a sedimentation process is provided to remove suspended solids from the wastewater before the aeration process, and the suspended solids are precipitated to some extent. If the supernatant is aerated, the purification efficiency by aeration increases. However, in the present invention, suspended solids in the washing wastewater are also removed by the koji mold, and therefore, it is possible to add a koji mold to the washing wastewater immediately after the washing step and perform the aeration treatment without providing a precipitation step.

また、曝気工程では、エジェクターによって排水中に酸素を大量に供給することで、排水中の溶存酸素量を増やすことができ、好気性菌である麹菌の増殖を促進させることができると共に、元々排水中に含まれる浄化に有用な好気性菌の増殖をも促進させることができる。さらに、例えば藻類に多く含まれるヨウ素など揮発性の物質が排水に含まれている場合でも、効率よくこれを気化させ除去することができる。   In the aeration process, the amount of dissolved oxygen in the wastewater can be increased by supplying a large amount of oxygen into the wastewater by the ejector, which can promote the growth of koji mold, which is an aerobic bacterium. It is also possible to promote the growth of aerobic bacteria useful for purification contained therein. Further, even when a volatile substance such as iodine contained in a large amount of algae is contained in the wastewater, it can be efficiently vaporized and removed.

本発明で利用される麹菌としては、例えばアスペルギルス・カワチ(Aspergillus kawachii)、アスペルギルス・アワモリ(Aspergillus awamori)、アスペルギルス・サイトイ(Aspergillus saitoi)等のアスペルギルス属の中から選択されることが望ましい。安全性などの面から食品添加物として認められている麹菌を用いることが好ましいからである。なお、これらの麹菌は単独で用いることもできるし、複数種を併用することもできる。   As the gonococcus used in the present invention, for example, it is preferable that Aspergillus kawachii, Aspergillus awamori, Aspergillus saitoi, and the like selected from the genus Aspergillus saitoi are desirable. This is because it is preferable to use koji mold that is recognized as a food additive in terms of safety and the like. In addition, these koji molds can also be used independently and can also use multiple types together.

上記排水に対する麹菌の添加量は、例えば湿重量で0.05〜10W/V%の範囲で浄化効果が見られる。もちろん麹菌の添加量が多いほど短時間で排水を浄化することができるが、麹菌は排水中でも増殖していくので、場合に応じて添加量を調節すればよい。換言すれば、麹菌の添加量は、特に限定されるものではなく、排水の汚染状況等に応じて適宜調整することができる。   As for the amount of koji mold added to the waste water, for example, a purification effect is seen in the range of 0.05 to 10 W / V% by wet weight. Of course, the greater the amount of koji mold added, the more the wastewater can be purified. However, the koji mold grows even in the wastewater, so the added amount may be adjusted according to circumstances. In other words, the addition amount of the koji mold is not particularly limited, and can be appropriately adjusted according to the contamination status of the waste water.

海苔の製造工程から出る排水が汚濁される原因としては、海苔に由来する微細な浮遊物や色素等であると考えられる。海苔の養殖加工場では、これまでは海苔の製造工程から出る洗浄排水を一旦沈殿槽に送り、ここで排水中の懸濁物質を沈殿させた後に上澄み排水を沈殿槽からオーバーフローさせ、これをそのまま海や川などに垂れ流していたが、沈殿されない微細な浮遊物や排水中に溶け込んでいる着色物質のために、十分浄化されない排水が海や川を汚染していた。そこで、本発明では海苔の製造工程から出る洗浄排水に麹菌を添加すると共にこれを曝気することで、汚濁成分を十分に取り除いてから海や川に排水することができ、汚染の防止を図るものである。   The cause of contamination of the wastewater from the production process of nori is thought to be fine suspended matters or pigments derived from nori. Until now, the laver aquaculture plant has sent the washing wastewater from the laver production process to the sedimentation tank, where the suspended solids in the wastewater are allowed to settle, and then the supernatant wastewater overflows from the sedimentation tank. Drained into the sea and rivers, etc., but the wastewater that was not sufficiently purified contaminated the sea and rivers due to the fine suspended solids that did not settle and the colored substances dissolved in the wastewater. Therefore, in the present invention, the koji mold is added to the washing wastewater from the seaweed manufacturing process and aerated, so that the polluted components can be sufficiently removed and then drained into the sea or river, thereby preventing pollution. It is.

以上説明したように、本発明に係る海苔の排水処理方法によれば、海苔を製造する際に出る洗浄排水から汚濁成分を簡易な方法で且つ十分に取り除くことができる。   As described above, according to the laver wastewater treatment method according to the present invention, the pollutant components can be sufficiently removed from the washing wastewater produced when the laver is produced by a simple method.

以下、本発明に係る海苔の排水処理方法の好ましい実施の形態を詳細に説明する。
本発明における曝気工程では、エジェクターを用いて排水を曝気している。エジェクターにコンプレッサーを接続し、コンプレッサーからエジェクター内に空気を圧送することによって、排水中に十分な量の酸素を効率的に取り込むことができる。図1は本発明に用いられるエジェクター1の一実施態様を示したものである。このエジェクター1は、左右の大径管部2,3と、この大径管部2,3を中央で接続する小径管部4とで構成されている。一方の大径管部2の一端には水取入口5が設けられ、この水取入口5に水中ポンプ8(図2を参照)が接続されている。また、他方の大径管部3の一端には水放出口6が設けられている。さらに、小径管部4にはコンプレッサー9(図2を参照)を接続するための接続管7が突出形成されている。
Hereinafter, preferred embodiments of the laver wastewater treatment method according to the present invention will be described in detail.
In the aeration process in the present invention, the waste water is aerated using an ejector. By connecting a compressor to the ejector and pumping air from the compressor into the ejector, a sufficient amount of oxygen can be efficiently taken into the waste water. FIG. 1 shows an embodiment of an ejector 1 used in the present invention. The ejector 1 includes left and right large-diameter pipe portions 2 and 3 and a small-diameter pipe portion 4 that connects the large-diameter pipe portions 2 and 3 at the center. A water intake 5 is provided at one end of one large-diameter pipe portion 2, and a submersible pump 8 (see FIG. 2) is connected to the water intake 5. Further, a water discharge port 6 is provided at one end of the other large-diameter pipe portion 3. Further, a connecting pipe 7 for connecting a compressor 9 (see FIG. 2) is formed on the small diameter pipe portion 4 so as to protrude.

上記構成からなるエジェクター1は水中ポンプ8と共に曝気槽12(図2を参照)内に設置され、さらに曝気槽12の外に設置されたコンプレッサ9とも接続される。水中ポンプ8とコンプレッサー9を駆動すると、水中ポンプ8によってエジェクター1の水取入口5から大径管部2内に排水が圧送される一方、コンプレッサー9によって接続管7から小径管部4内に空気が圧送される。そして、前記大径管部2内に圧送された排水が小径管部4を通過する際に、前記小径管部4内に圧送された空気と激しくぶつかり合って、排水の中に酸素が多量に溶解し、他方の大径管部3の水放出口6から溶存酸素量が増加した排水が放出される。なお、本発明にあっては、エジェクター1の酸素溶解能力、すなわち排水の溶存酸素量を増大させる能力は酸素溶解速度などに依存し、例えばコンプレッサー9からの空気の吐出量で調整することができる。   The ejector 1 having the above configuration is installed in the aeration tank 12 (see FIG. 2) together with the submersible pump 8, and further connected to the compressor 9 installed outside the aeration tank 12. When the submersible pump 8 and the compressor 9 are driven, the submersible pump 8 pumps the waste water from the water intake 5 of the ejector 1 into the large-diameter pipe portion 2, while the compressor 9 sends air from the connecting pipe 7 into the small-diameter pipe portion 4. Is pumped. When the wastewater pumped into the large-diameter pipe portion 2 passes through the small-diameter pipe portion 4, it collides violently with the air pumped into the small-diameter pipe portion 4, and a large amount of oxygen is contained in the drainage. Dissolved and discharged from the water discharge port 6 of the other large-diameter pipe part 3 is discharged wastewater having an increased amount of dissolved oxygen. In the present invention, the ability of the ejector 1 to dissolve oxygen, that is, the ability to increase the amount of dissolved oxygen in the waste water depends on the oxygen dissolution rate and can be adjusted by, for example, the amount of air discharged from the compressor 9. .

図2は、本発明に係る海苔の排水処理方法の処理工程を示したものであり、この処理工程において使用される排水処理装置は、例えば洗浄工程における洗浄槽10の後に、排水中の懸濁物質を除去する沈殿処理工程における沈殿槽11と、排水に酸素を供給する曝気工程における曝気槽12とを備えている。この実施形態では曝気工程の中に麹菌の添加工程を含んでおり、曝気槽12の排水流入口付近に麹菌添加装置13が設置されている。先ず、洗浄槽10において海苔を洗浄した後の洗浄排水は、沈殿処理工程における沈殿槽11に送り込まれ、そこで懸濁物質の中でも比較的重い粒子が沈殿される。次いで沈殿槽11からオーバーフローした上澄み排水は曝気槽12内に流入し、麹菌添加装置13から適量の麹菌が供給される。さらに、麹菌が添加された後の排水に、曝気槽12内に設置したエジェクター1によって多量の酸素が吹き込まれ、溶存酸素の増加によって麹菌の増殖が活発となり、麹菌の作用による排水の浄化が促進される。浄化された排水は、そのまま海や川などに流される。なお、エジェクター1及び麹菌添加装置13の設置位置は、排水中に空気を多量に取り込むことによって麹菌の増殖が活発となる位置が望ましく、例えば曝気槽12内に上澄み排水が流れ込み流入口付近に麹菌添加装置13、エジェクター1の順に並べて配置するのが好ましい。また、曝気する際の排水温度が低すぎると排水中の溶存酸素量に悪影響を与えるので、必要であれば、排水の温度を20〜30℃に加温することも可能である。   FIG. 2 shows the treatment process of the laver wastewater treatment method according to the present invention, and the wastewater treatment apparatus used in this treatment process is, for example, suspended in wastewater after the washing tank 10 in the washing process. A precipitation tank 11 in a precipitation treatment process for removing substances and an aeration tank 12 in an aeration process for supplying oxygen to waste water are provided. In this embodiment, the step of adding koji mold is included in the aeration process, and the koji mold adding device 13 is installed in the vicinity of the drain inlet of the aeration tank 12. First, the washing waste water after washing the laver in the washing tank 10 is sent to the precipitation tank 11 in the precipitation treatment process, where relatively heavy particles are precipitated among the suspended substances. Next, the supernatant waste water overflowed from the settling tank 11 flows into the aeration tank 12 and an appropriate amount of koji mold is supplied from the koji mold adding device 13. Furthermore, a large amount of oxygen is blown into the waste water after the addition of Aspergillus by the ejector 1 installed in the aeration tank 12, and the growth of Aspergillus becomes active due to the increase in dissolved oxygen, and the purification of waste water by the action of Aspergillus is promoted. Is done. The purified wastewater is discharged directly into the sea or river. The position where the ejector 1 and the koji mold adding device 13 are installed is preferably a position where the growth of koji mold becomes active when a large amount of air is taken into the drainage. For example, the supernatant drainage flows into the aeration tank 12 and the koji mold is near the inlet. It is preferable that the adding device 13 and the ejector 1 are arranged in this order. Moreover, since the wastewater temperature at the time of aeration will have a bad influence on the amount of dissolved oxygen in wastewater, the temperature of wastewater can also be heated to 20-30 degreeC if necessary.

以下、本発明を実施例によってさらに詳細に説明するが、本発明はこれに限定されるものではない。   EXAMPLES Hereinafter, although an Example demonstrates this invention further in detail, this invention is not limited to this.

(実施例)
乳白色に汚濁された海苔養殖場の洗浄排水に、湿重量で0.5W/V%となるように麹菌(アスペルギルス・カワチ)を添加し常温にて7日間曝気した。処理前の排水中の浮遊物質濃度は158ppmであったが、処理後57ppmに減少し、排水の透明度が向上した。なお、排水中の浮遊物質濃度は、携帯用多項目迅速水質分析計DR/2400(HACH社製)を用い、製品プロトコールに従って810nmの吸光度を測定することにより求めた。
(Example)
Bacteria (Aspergillus kawachi) was added to the washing drainage of the laver farm contaminated with milky white so that the wet weight would be 0.5 W / V% and aerated at room temperature for 7 days. The concentration of suspended solids in the wastewater before treatment was 158 ppm, but it decreased to 57 ppm after treatment and the transparency of the wastewater was improved. The concentration of suspended solids in the waste water was determined by measuring absorbance at 810 nm according to the product protocol using a portable multi-item rapid water quality analyzer DR / 2400 (manufactured by HACH).

(比較例)
上記実施例において麹菌を添加しなかったこと以外は同様にして排水を曝気処理した。その結果、処理前後において排水の状態に大きな変化は見られなかった。
(Comparative example)
The waste water was aerated in the same manner except that no koji mold was added. As a result, there was no significant change in the state of drainage before and after treatment.

本発明に係る排水処理方法に利用されるエジェクターの一実施形態を示す断面図である。It is sectional drawing which shows one Embodiment of the ejector utilized for the waste water treatment method which concerns on this invention. 本発明に係る排水処理方法の排水工程を示す図である。It is a figure which shows the drainage process of the waste water treatment method which concerns on this invention.

符号の説明Explanation of symbols

1 エジェクター
2,3 大径管部
4 小径管部
5 水取入口
6 水放水口
7 接続管
8 水中ポンプ
9 コンプレッサ
10 洗浄槽
11 沈殿槽
12 曝気槽
13 麹菌添加装置
DESCRIPTION OF SYMBOLS 1 Ejector 2,3 Large diameter pipe part 4 Small diameter pipe part 5 Water intake 6 Water outlet 7 Connection pipe 8 Submersible pump 9 Compressor 10 Washing tank 11 Precipitation tank 12 Aeration tank 13 Koji mold addition device

Claims (6)

海苔の製造工程から出る排水に麹菌を添加する工程と、この麹菌が添加された排水に酸素を供給する曝気工程とを備え、排水中に含まれる汚濁成分を取り除くことを特徴とする海苔の排水処理方法。 A laver drainage comprising a step of adding koji mold to the wastewater from the laver production process and an aeration process for supplying oxygen to the wastewater to which the koji mold is added, and removing pollutant components contained in the drainage Processing method. 前記麹菌を添加する工程が曝気工程の前に設けられ、又は曝気工程の中に含まれる請求項1記載の海苔の排水処理方法。 The method for treating wastewater from laver according to claim 1, wherein the step of adding the koji mold is provided before the aeration step or is included in the aeration step. 前記曝気工程の前に、排水中の懸濁物質を除去する沈殿処理工程が設けられる請求項1記載の海苔の排水処理方法。 The seaweed wastewater treatment method according to claim 1, wherein a precipitation treatment step for removing suspended substances in the wastewater is provided before the aeration step. 前記曝気工程では、エジェクターによって排水に酸素が供給される請求項1記載の海苔の排水処理方法。 The seaweed wastewater treatment method according to claim 1, wherein in the aeration step, oxygen is supplied to the wastewater by an ejector. 前記添加される麹菌としては、アスペルギルス・カワチ(Aspergillus kawachii)、アスペルギルス・アワモリ(Aspergillus awamori)、アスペルギルス・サイトイ(Aspergillus saitoi)等のアスペルギルス属の中から選択された1又は2以上である請求項1記載の海苔の排水処理方法。 The added gonococcus is selected from 1 or more of Aspergillus genus selected from among Aspergillus kawachii, Aspergillus awamori, Aspergillus saitoi, etc. 1 or 2 from Aspergillus genus The laver wastewater treatment method described. 前記麹菌は、排水に対して湿重量で0.05〜10W/V%の範囲で添加される請求項1記載の海苔の排水処理方法。
The method according to claim 1, wherein the koji mold is added in a wet weight range of 0.05 to 10 W / V% with respect to the wastewater.
JP2004065258A 2004-03-09 2004-03-09 Wastewater treatment method for laver Expired - Fee Related JP4454343B2 (en)

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