JP2002273475A - Device and method for treating nitrate nitrogen in sea water - Google Patents
Device and method for treating nitrate nitrogen in sea waterInfo
- Publication number
- JP2002273475A JP2002273475A JP2001083434A JP2001083434A JP2002273475A JP 2002273475 A JP2002273475 A JP 2002273475A JP 2001083434 A JP2001083434 A JP 2001083434A JP 2001083434 A JP2001083434 A JP 2001083434A JP 2002273475 A JP2002273475 A JP 2002273475A
- Authority
- JP
- Japan
- Prior art keywords
- seawater
- nitrate nitrogen
- tank
- denitrifying
- treatment
- 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.)
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Links
Classifications
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- 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
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、水槽中の海水に含
まれる硝酸性窒素の除去方法及び装置に関するものであ
る。更には、海水魚の閉鎖系循環飼育における硝酸性窒
素処理方法に関するものである。TECHNICAL FIELD The present invention relates to a method and an apparatus for removing nitrate nitrogen contained in seawater in a water tank. Furthermore, the present invention relates to a method for treating nitrate nitrogen in closed circulation breeding of marine fish.
【０００２】[0002]
【従来の技術】近年、陸上養殖が注目されており、閉鎖
循環系における硝酸性窒素処理が問題になっている。特
に、海水系の場合、淡水系に比較して非常に硝酸性窒素
処理が難しいために、従来の嫌気槽中で硝酸性窒素含有
排水に直接水素供与体を投入して脱窒を行わせるものを
用いると、低効率ゆえの大規模装置且つ多大な費用がか
かるために、結果的に海水の閉鎖循環系条件での硝酸性
窒素処理対策が不充分な状況であった。2. Description of the Related Art In recent years, land aquaculture has attracted attention, and nitrate nitrogen treatment in a closed circulation system has become a problem. In particular, in the case of seawater systems, since nitrate nitrogen treatment is extremely difficult compared to freshwater systems, denitrification is performed by directly adding a hydrogen donor to nitrate nitrogen-containing wastewater in a conventional anaerobic tank. However, the use of a large-scale apparatus and a large cost due to low efficiency resulted in insufficient nitrate nitrogen treatment measures under the closed circulation system of seawater.
【０００３】WO00/18694号公報には、硫黄とカルシウム
系成分からなる脱窒無機材料を使用した硫黄酸化細菌に
よる安価、且つ効率的な硝酸性窒素処理が提案されてい
る。この方法は、微生物の働きにより脱窒を行うもので
あるため、環境の異なる海水中における硝酸性窒素処理
への適用可能性は疑問があるものであった。[0003] WO00 / 18694 proposes an inexpensive and efficient nitrate nitrogen treatment by sulfur-oxidizing bacteria using a denitrifying inorganic material composed of sulfur and calcium components. Since this method performs denitrification by the action of microorganisms, its applicability to nitrate nitrogen treatment in seawater in different environments was questionable.
【０００４】[0004]
【発明が解決しようとする課題】本発明は、海水槽に対
してコンパクトな容積を有する浄化処理装置にて閉鎖循
環系を維持しながら海水中に含まれる硝酸性窒素を効果
的に除去することを可能とする安価で実用的な海水中硝
酸性窒素の処理方法を提供するものである。SUMMARY OF THE INVENTION It is an object of the present invention to effectively remove nitrate nitrogen contained in seawater while maintaining a closed circulation system by a purification treatment apparatus having a compact volume with respect to a seawater tank. An inexpensive and practical method for treating nitrate nitrogen in seawater is provided.
【０００５】[0005]
【課題を解決するための手段】本発明は、水槽中の海水
を閉鎖循環系で浄化するに当たり、水槽から連続的に海
水の一部を抜き出し、その少なくとも一部を硫黄とカル
シウム系成分からなる脱窒無機材料が充填された脱窒装
置を通過させて硝酸性窒素を除去し、再び水槽に戻すこ
とを特徴とする海水中硝酸性窒素の処理方法である。ま
た、本発明は、 (A)海水を貯槽する水槽、(B)脱窒微生
物が生育している硫黄とカルシウム系成分からなる脱窒
無機材料が充填された脱窒装置及び(C)水槽の海水の一
部を抜き出し、抜き出された海水の少なくとも一部を前
記充填槽を通過させ、水槽に戻す手段を有してなること
を特徴とする海水中の硝酸性窒素の処理装置である。According to the present invention, in purifying seawater in a water tank by a closed circulation system, a part of the seawater is continuously extracted from the water tank, and at least a part of the water is composed of sulfur and calcium-based components. A method for treating nitrate nitrogen in seawater, comprising removing nitrate nitrogen through a denitrification device filled with a denitrification inorganic material and returning the nitrate nitrogen to a water tank again. Also, the present invention provides (A) a water tank for storing seawater, (B) a denitrification apparatus filled with a denitrification inorganic material composed of sulfur and calcium-based components in which denitrification microorganisms are growing, and (C) a water tank. An apparatus for treating nitrate nitrogen in seawater, comprising means for extracting a part of the seawater, passing at least a part of the extracted seawater through the filling tank, and returning the seawater to the tank.
【０００６】本発明は、海水の取入れの困難な陸地等に
設けられた海水魚等の海洋生物を生育するための水槽の
海水を浄化するものである。水槽の海水の浄化ための方
法としては、ろ過、活性炭処理、空気暴気等が一般的で
あるが、硝酸性窒素の除去は一般的に困難であり、海水
の入れ替え等が頻繁に必要となる。通常、海洋生物を入
れる水槽は、浄化するための手段を備えた補助水槽や装
置と接続して、連続的に海水を循環しており、閉鎖循環
系を構成している。本発明の装置は、上記のような閉鎖
循環系の一部に特定の脱窒無機材料が充填された脱窒装
置を設置するものであり、脱窒装置には循環系の全部の
海水が通過してもよく、バイパス路を設け一部のみを通
過させてもよい。The present invention is to purify seawater in an aquarium for growing marine organisms such as saltwater fish provided on land or the like where seawater intake is difficult. As a method for purifying seawater in an aquarium, filtration, activated carbon treatment, air storm, and the like are common, but removal of nitrate nitrogen is generally difficult, and replacement of seawater is frequently required. . Usually, a water tank for holding marine organisms is connected to an auxiliary water tank or an apparatus provided with a means for purifying the water, and continuously circulates seawater to form a closed circulation system. The device of the present invention is a device in which a denitrification device filled with a specific denitrification inorganic material is installed in a part of the closed circulation system as described above, and all the seawater of the circulation system passes through the denitrification device. Alternatively, a bypass may be provided and only a part of the bypass may be passed.
【０００７】海水中における硝酸性窒素処理では、淡水
中の場合と異なり、生物処理方式の脱窒処理環境が大き
く変わるためため、処理する海水の流入量や温度の管理
が重要となる。本発明の硫黄とカルシウム系成分からな
る脱窒無機材料を使用する場合においても、この脱窒無
機材料が充填された充填槽に流入される海水量を適量に
コントロールすることが最良の結果を与えるため望まし
い。In the nitrate nitrogen treatment in seawater, the environment of the denitrification treatment in the biological treatment system is greatly different from the case of freshwater, so that the management of the inflow rate and temperature of the treated seawater is important. Even in the case of using the denitrifying inorganic material comprising the sulfur and calcium-based components of the present invention, it is best to control the amount of seawater flowing into a filling tank filled with the denitrifying inorganic material to an appropriate amount. Desirable.
【０００８】すなわち、脱窒無機材料ｍ(kg)と、処理装
置に流し込む海水量Ｑ(L/day)との関係をｍ＝ａＱで表
すとき、ａは０.０５以上、好ましくは０．１以上、よ
り好ましくは０．２以上であることがよい。ａの上限値
については、技術上は特に制限を設けるものではない。
ａの値が大きければ大きいほど、脱窒無機材料と海水の
接触時間が長くとれるので、硝酸性窒素の脱窒率は向上
するが、ａの値が大きくなると使用する脱窒無機材料量
が増えるために、コストアップにつながったり、また装
置の肥大化にもつながり、条件次第では過大設備になる
恐れもあるため、先に述べた海水槽水槽に対する硝酸性
窒素処理槽の大きさを出来るだけコンパクトにするとい
う目的を考えればａの値は２以下が好ましい。なお、ａ
の値は海水量Ｑを小さくすることによっても大きな値と
することができるが、処理海水量が減少し、全体として
の硝酸性窒素の脱窒率は向上しない。That is, when the relationship between the denitrifying inorganic material m (kg) and the amount of seawater Q (L / day) flowing into the treatment apparatus is represented by m = aQ, a is 0.05 or more, preferably 0.1 Above, more preferably 0.2 or more. The upper limit of a is not particularly limited in terms of technology.
The larger the value of a, the longer the contact time between the denitrifying inorganic material and the seawater, so that the denitrification rate of nitrate nitrogen is improved, but the larger the value of a, the larger the amount of the denitrifying inorganic material used As a result, the size of the nitrate nitrogen treatment tank with respect to the seawater tank mentioned above can be reduced as much as possible, since this may lead to an increase in cost and an increase in the size of the equipment, which may lead to excessive equipment depending on the conditions. In consideration of the purpose of the above, the value of a is preferably 2 or less. Note that a
Can be increased by reducing the amount of seawater Q, but the amount of treated seawater decreases, and the overall rate of denitrification of nitrate nitrogen does not improve.
【０００９】そこで、水槽及び循環系の予備水槽、配管
等で使用されている海水量Ｍ(L)と処理装置に流し込む
海水量Ｑ(L/day)の関係については、技術上は特に制限
を設けるものではない。しかしながら前述のａ値同様、
Ｑのが大きくなるすぎると、使用する硫黄とカルシウム
系成分からなる無機材料量が増えるために、コストアッ
プつながったり、また装置の肥大化にもつながり、条件
次第では過剰設備になる恐れもあるため、先に述べた海
水槽水槽に対する硝酸性窒素処理槽の大きさを出来るだ
けコンパクトにするという目的を考えれば、ひとつの目
安としてＱ≦０．３Ｍが好ましい。また下限値について
も同様で、特に制限を設けるものではないが、海水貯槽
中の海水の硝酸性窒素濃度が極端に高い場合は、Ｑ値が
低すぎると、処理時間が長くなるなどの恐れも生ずるた
め、望ましくは０．０１Ｍ≦Ｑであることがよい。これ
を、Ｑ/Ｍで表せば、一日当たりの海水の回転率とな
り、海水の１％以上、３０％以下を１日に処理装置に流
し込むことになる。好ましくは０.０５〜０．２/dayの
範囲とすることが有利である。そして、ｍ＝ａＱに、例
えば前記のＱ/Ｍ≧０．０５/dayという式を組み込め
ば、ｍ≧０．０５ａＭとなり、更に、例えば前記のａ≧
０.０５という式を組み込めば、ｍ≧０．００２５Ｍと
なるから、処理装置に充填する脱窒無機材料量ｍ(kg)
は、海水量Ｍ(L)の１/４００以上が必要と計算され、ま
たｍ＝ａＱに前記のＱ/Ｍ≦０．２/dayという式を組み
込めば、ｍ≦０．２ａＭとなり、更に、例えば前記のａ
≦２という式を組み込めば、ｍ≦０．４Ｍとなるから、
処理装置に充填する脱窒無機材料量ｍ(kg)は、海水量を
Ｍ(L)の２/５以下が必要と計算されるが、好ましくは
０．０１〜０．３の範囲である。[0009] In view of the above, there is no particular limitation in the technical relationship between the amount of seawater M (L) used in the water tank, the spare water tank of the circulation system, the piping, etc. and the amount of seawater Q (L / day) flowing into the treatment apparatus. It is not provided. However, similar to the above a value,
If the value of Q is too large, the amount of the inorganic material composed of sulfur and calcium-based components used increases, leading to an increase in cost and an increase in the size of the apparatus, which may lead to excessive equipment depending on conditions. Considering the purpose of making the size of the nitrate nitrogen treatment tank as small as possible with respect to the seawater tank as described above, one standard is preferably Q ≦ 0.3M. The same applies to the lower limit, and there is no particular limitation. However, when the concentration of nitrate nitrogen in seawater in the seawater storage tank is extremely high, if the Q value is too low, the processing time may be prolonged. Therefore, it is desirable that 0.01M ≦ Q be satisfied. If this is represented by Q / M, it becomes the rate of rotation of seawater per day, and 1% or more and 30% or less of seawater are poured into the processing apparatus in one day. It is advantageous to set the range to preferably 0.05 to 0.2 / day. Then, if m / aQ incorporates, for example, the above formula of Q / M ≧ 0.05 / day, then m ≧ 0.05aM, and further, for example, the above a ≧
If the formula of 0.05 is incorporated, m ≧ 0.0025M, so the amount of denitrifying inorganic material m (kg) to be charged into the processing equipment
Is calculated to be 1/400 or more of the amount of seawater M (L), and if m / aQ incorporates the formula of Q / M ≦ 0.2 / day, then m ≦ 0.2aM. For example, a
If the equation of ≦ 2 is incorporated, m ≦ 0.4M.
It is calculated that the amount m (kg) of the denitrifying inorganic material to be charged into the treatment apparatus is required to be equal to or less than 2/5 of the amount of seawater M (L), but is preferably in the range of 0.01 to 0.3.
【００１０】本発明において、処理装置に充填される硫
黄とカルシウム系成分からなる脱窒無機材料は、前記WO
00/18694号公報に記載されたような硫黄とカルシウム系
成分とからなる無機材料を使用することが好ましい。例
えば、溶融した硫黄に炭酸カルシウム又は炭酸カルシウ
ムを含む粉末を分散させ、それを急冷して得られるもの
が挙げられる。硫黄と炭酸カルシウムの比率は広範囲に
変えることができるが、2：1〜3：2の範囲程度が好まし
い。その他、前記WO00/18694号公報に記載されたような
多孔質物質、鉱物繊維等を配合することも有利である。
かかる脱窒無機材料の原料、製造方法、使用条件等は、
前記WO00/18694号公報等（例えば、特願平１０−２７１
９２０号、特願平１１−１５９１５８号、特願平１１−
２２６２０６号、特願平１１−２８２００７７号等）の
記載が参照できる。[0010] In the present invention, the denitrifying inorganic material containing sulfur and calcium-based components to be charged into the treatment apparatus is the above WO
It is preferable to use an inorganic material comprising sulfur and a calcium-based component as described in 00/18694. For example, there can be mentioned those obtained by dispersing calcium carbonate or a powder containing calcium carbonate in molten sulfur and quenching the powder. The ratio of sulfur to calcium carbonate can vary widely, but is preferably in the range of 2: 1 to 3: 2. In addition, it is also advantageous to incorporate a porous substance, mineral fiber, and the like as described in WO00 / 18694.
The raw materials of such a denitrifying inorganic material, production method, use conditions, etc.
WO00 / 18694 and the like (for example, Japanese Patent Application No. 10-271)
920, Japanese Patent Application No. 11-159158, Japanese Patent Application No. 11-159
226206, Japanese Patent Application No. 11-2820077, etc.) can be referred to.
【００１１】本発明における硝酸性窒素処理の原理は、
脱窒無機材料と硫黄酸化脱窒細菌等の微生物によるもの
であるため、処理装置の温度は１０〜５０℃であること
は好ましく、より望ましくは２０〜４０℃であることが
よい。処理装置の温度が１０℃よりも低くなったり、逆
に５０℃よりも高くなると、硫黄酸化脱窒細菌等の微生
物の活性が低下するために好ましくない。硫黄酸化脱窒
細菌等の微生物は硫黄を酸化して硫酸イオンとすると共
に硝酸イオンや亜硝酸イオンのような硝酸性窒素を還元
して窒素ガスとして放出する。この際、炭酸イオンも消
費されるが水中の炭酸イオンの他、炭酸カルシウムの有
する炭酸イオンも一部利用され、生成する硫酸イオンは
炭酸カルシウムが中和する。The principle of the nitrate nitrogen treatment in the present invention is as follows.
The temperature of the treatment device is preferably 10 to 50 ° C, more preferably 20 to 40 ° C, because it is derived from a denitrifying inorganic material and microorganisms such as sulfur oxidizing and denitrifying bacteria. If the temperature of the treatment device is lower than 10 ° C. or higher than 50 ° C., it is not preferable because the activity of microorganisms such as sulfur oxidizing and denitrifying bacteria decreases. Microorganisms such as sulfur oxidizing and denitrifying bacteria oxidize sulfur to sulfate ions and reduce nitrate nitrogen such as nitrate ions and nitrite ions to release them as nitrogen gas. At this time, carbonate ions are also consumed, but in addition to carbonate ions in water, some carbonate ions of calcium carbonate are also used, and the generated sulfate ions are neutralized by calcium carbonate.
【００１２】本発明で使用する脱窒無機材料を充填する
処理装置の形状は、槽状であっても、円筒状であっても
差し支えないが、通常は実使用上利便性のよい円筒形状
のものや直方体形状のものが好ましい。これらの処理装
置は１つである必要は無く、目的に応じて複数使用して
もよい。また、複数使用する場合、円筒形と直方体形状
を併用してもよいし、並べ方も並列でもよいし直列でも
よい。例えば、円筒形処理槽を２つ使用してＵ字管のよ
うにして使用するやり方なども本発明の効果を発揮しや
すい形状である。The processing apparatus for filling the denitrifying inorganic material used in the present invention may be in the form of a tank or a cylinder, but it is usually in the form of a cylinder having good convenience for practical use. And those having a rectangular parallelepiped shape are preferred. There is no need to use one of these processing apparatuses, and a plurality of processing apparatuses may be used according to the purpose. In the case of using a plurality, a cylindrical shape and a rectangular parallelepiped shape may be used in combination, and the arrangement may be in parallel or in series. For example, a method in which two cylindrical processing tanks are used like a U-shaped pipe using two cylindrical processing tanks is a shape that can easily exert the effects of the present invention.
【００１３】また、本発明においては、上記処理装置の
他に、他の目的で使用される浄化装置、例えばろ過装置
や活性炭吸着装置の他、塩分補給装置、温度調整装置、
溶存酸素調整装置などを併設してもよい。例えば、当該
処理装置の前に硝化槽や脱溶存酸素装置を付設したり、
あるいは処理装置の後に消毒槽を付設することも好まし
い態様である。更に、上記処理装置に行く海水と、他の
処理装置に行く海水とに分岐させることも好ましい態様
である。[0013] In the present invention, in addition to the above-described processing apparatus, a purifying apparatus used for another purpose, such as a filtering apparatus or an activated carbon adsorbing apparatus, a salt replenishing apparatus, a temperature adjusting apparatus,
A dissolved oxygen adjusting device or the like may be provided. For example, a nitrification tank or a dissolved oxygen device may be added in front of the treatment device,
Alternatively, it is also a preferable embodiment to provide a disinfection tank after the processing apparatus. Furthermore, it is also a preferable embodiment to branch into seawater going to the above-mentioned treatment device and seawater going to another treatment device.
【００１４】[0014]
【発明の実施の形態】図面を参照して以下に説明する。
図１は本発明の海水槽と処理装置槽の関係を模式的に示
す説明図である。海水槽1からポンプ5によりくみ上げら
れた海水2は、硫黄とカルシウム系成分からなる脱窒無
機材料4を充填した処理装置3を所定の速度で通過し、硝
酸性窒素が除去され。その後、海水槽1に循環される。
なお、処理装置3はバンドヒーター等の温度制御装置に
より、所定温度に設定されている。また、下記の比較例
及び実施例においては、木更津海岸にて採取した海水を
使用した。BRIEF DESCRIPTION OF THE DRAWINGS FIG.
FIG. 1 is an explanatory view schematically showing the relationship between a seawater tank and a processing apparatus tank according to the present invention. The seawater 2 pumped from the seawater tank 1 by the pump 5 passes at a predetermined speed through a treatment device 3 filled with a denitrifying inorganic material 4 composed of sulfur and calcium-based components, and nitrate nitrogen is removed. Then, it is circulated to the seawater tank 1.
The processing device 3 is set to a predetermined temperature by a temperature control device such as a band heater. In the following comparative examples and examples, seawater collected from Kisarazu coast was used.
【００１５】[0015]
【実施例】実施例１〜３及び参考例１ 長さ６００mm×幅３００mm×高さ４５０mmの海水槽に５
０Lの海水を入れて、ンプにて海水槽より1日あたり１０
Lの海水をくみ出して、粒形状５mm〜２０mm範囲の不定
形状の硫黄５０重量部と炭酸カルシウム５０重量部を溶
融混合して得られた脱窒無機材料粒子を充填した処理装
置に通水した。処理装置は直径１６０mm×高さ４５０mm
の円筒形状とし、脱窒無機材料粒子の充填量を種々変化
させた。処理装置の容積は海水槽の容積の１／８以下で
ある。なお、海水はすべて閉鎖系で循環している。処理
装置の温度は３０℃に設定とした。この海水槽に大塚化
学製のＯＫ−Ｆ−２を硝酸性窒素濃度１００mg/Lとなる
ように投入して、海水貯槽から処理槽へ通過する排水量
を各種変化させて（すなわち、前記式Ｑ＝ａｍにおける
ａ値を種々変化させて）、循環開始後の硝酸性窒素濃度
の経時変化を調べた。結果を表１に示す。EXAMPLES Examples 1 to 3 and Reference Example 1 5 mm in a seawater tank of 600 mm length x 300 mm width x 450 mm height.
Add 0L of seawater and pump 10 times a day from the seawater tank.
L seawater was extracted and passed through a treatment apparatus filled with denitrifying inorganic material particles obtained by melting and mixing 50 parts by weight of irregularly shaped sulfur and 50 parts by weight of calcium carbonate having a particle size range of 5 mm to 20 mm. Processing device is 160mm in diameter x 450mm in height
And the filling amount of the denitrifying inorganic material particles was variously changed. The volume of the processing device is less than 1/8 of the volume of the seawater tank. All seawater is circulating in a closed system. The temperature of the processing apparatus was set to 30 ° C. Into this seawater tank, OK-F-2 manufactured by Otsuka Chemical Co. was charged so as to have a nitrate nitrogen concentration of 100 mg / L, and the amount of wastewater passing from the seawater storage tank to the treatment tank was changed in various ways (that is, the above formula Q = The value of a in am was changed variously), and the change over time in the nitrate nitrogen concentration after the start of circulation was examined. Table 1 shows the results.
【００１６】[0016]
【表１】 [Table 1]
【００１７】実施例４〜６及び参考例２ 実施例１〜３の装置に準ずる装置を使用して、長さ１５
００ｍｍ×幅６００ｍｍ×高さ６００ｍｍの海水貯槽水
槽に３００Lの海水を入れて、ポンプにて海水貯槽より1
日あたり５０Lの海水をくみ出して、粒形状５ｍｍ〜２
０ｍｍ範囲の不定形状の硫黄５０重量部と炭酸カルシウ
ム５０重量部からなる溶融混合無機材料粒充填槽に通水
した。処理槽は高さ６００ｍｍ×幅３５０ｍｍ×長さ４
００ｍｍの直方体形状とし、無機物充填量を種々変化さ
せた。処理槽の容積は海水槽水槽の容積の１／６以下で
ある。その他の条件は実施例１〜３の条件と同じであ
る。この海水貯槽に大塚化学製のＯＫ−Ｆ−２を硝酸性
窒素濃度２００ｍｇ／Ｌとなるように投入して、海水貯
槽から処理槽に通過する排水量を各種変化させて、循環
開始後の硝酸性窒素濃度の経時変化を調べた。結果を表
２に示す。Examples 4 to 6 and Reference Example 2 A device having a length of 15
300L of seawater is put into a seawater tank with a size of 00mm x 600mm x 600mm in height.
Extracts 50L of seawater per day, and 5mm-2
Water was passed through a molten mixed inorganic material particle filling tank composed of 50 parts by weight of irregularly shaped sulfur and 50 parts by weight of calcium carbonate in a range of 0 mm. Processing tank is 600mm high x 350mm wide x 4 length
A rectangular parallelepiped shape of 00 mm was used, and the amount of the inorganic substance charged was varied. The capacity of the treatment tank is 1/6 or less of the capacity of the seawater tank. Other conditions are the same as those of Examples 1 to 3. Into this seawater storage tank, OK-F-2 manufactured by Otsuka Chemical Co., Ltd. was charged so as to have a nitrate nitrogen concentration of 200 mg / L, and the amount of wastewater passing from the seawater storage tank to the treatment tank was changed in various ways. The change over time in the nitrogen concentration was examined. Table 2 shows the results.
【００１８】[0018]
【表２】 [Table 2]
【００１９】[0019]
【発明の効果】本発明によれば、通常、大規模且つ多大
な費用を必要とする海水中の硝酸性窒素処理問題に対し
て、簡便且つ低コスト、効率的な硝酸性窒素処理を実現
できる。従って、当該技術は従来困難とされてきた海水
魚の閉鎖系循環飼育における硝酸性窒素処理方法を容易
且つ効率的に解決できる手法として画期的である。発明
の効果は顕著である。According to the present invention, a simple, low-cost, and efficient nitrate nitrogen treatment can be realized for the problem of treating nitrate nitrogen in seawater, which is usually large-scale and requires a great deal of cost. . Therefore, this technique is a breakthrough as a technique that can easily and efficiently solve the method of treating nitrate nitrogen in closed circulation breeding of marine fish, which has been difficult in the past. The effect of the invention is remarkable.
【図１】 海水槽と処理装置槽の関係を示す説明図FIG. 1 is an explanatory diagram showing a relationship between a seawater tank and a processing apparatus tank.
1：海水槽 2：海水 3：処理装置 4：脱窒無機材料 5：ポンプ 1: Seawater tank 2: Seawater 3: Treatment equipment 4: Denitrifying inorganic material 5: Pump
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.7 識別記号 ＦＩ テーマコート゛(参考） Ｃ１２Ｍ 1/00 Ｃ１２Ｍ 1/00 Ｚ 1/40 1/40 Ｚ ──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. 7 Identification symbol FI Theme coat ゛ (Reference) C12M 1/00 C12M 1/00 Z 1/40 1/40 Z
Claims (3)
当たり、水槽から連続的に海水の一部を抜き出し、その
少なくとも一部を硫黄とカルシウム系成分からなる脱窒
無機材料が充填された脱窒装置を通過させて硝酸性窒素
を除去し、再び水槽に戻すことを特徴とする海水中の硝
酸性窒素の処理方法。In purifying seawater in a water tank by a closed circulation system, a part of seawater is continuously extracted from the water tank, and at least a part of the seawater is filled with a denitrifying inorganic material composed of sulfur and calcium-based components. A method for treating nitrate nitrogen in seawater, comprising removing nitrate nitrogen through a denitrification device and returning the nitrate nitrogen to a water tank again.
(kg)と、処理槽に流し込む海水量Ｑ(L/day)との関係を
ｍ＝ａＱで表したとき、ａが０．０５以上である請求項
１記載の海水中の硝酸性窒素の処理方法。2. The amount m of the denitrifying inorganic material filled in the denitrification apparatus
The treatment of nitrate nitrogen in seawater according to claim 1, wherein a is equal to or greater than 0.05 when the relationship between (kg) and the amount of seawater Q (L / day) poured into the treatment tank is represented by m = aQ. Method.
が生育している硫黄とカルシウム系成分からなる脱窒無
機材料が充填された脱窒装置及び(C)水槽の海水の一部
を抜き出し、抜き出された海水の少なくとも一部を前記
脱窒装置を通過させ、水槽に戻す手段を有してなること
を特徴とする海水中の硝酸性窒素の処理装置。(A) a water tank for storing seawater, (B) a denitrification apparatus filled with a denitrification inorganic material composed of sulfur and calcium-based components in which denitrification microorganisms are growing, and (C) seawater in a water tank A means for extracting a part of the seawater, passing at least a part of the extracted seawater through the denitrification device, and returning the seawater to a water tank.
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| WO2004031084A1 (en) * | 2002-09-30 | 2004-04-15 | Nippon Steel Chemical Co., Ltd. | Method of removing nitrate nitrogen and device used for the method |
| JP2004322023A (en) * | 2003-04-28 | 2004-11-18 | Nippon Steel Chem Co Ltd | Nitrate nitrogen treatment material and nitrate nitrogen treatment method |
| JP2013063036A (en) * | 2011-09-16 | 2013-04-11 | Clion Co Ltd | Method for raising aquatic animals, and method for removing nitrate-nitrogen |
| KR101342052B1 (en) | 2012-07-10 | 2013-12-18 | 윤효석 | Method for removing nitrates from a solution comprising salt ingredient |
| WO2018067581A1 (en) * | 2016-10-04 | 2018-04-12 | Georgia Aquarium Inc. | Removing nitrate from water |
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| WO2018067581A1 (en) * | 2016-10-04 | 2018-04-12 | Georgia Aquarium Inc. | Removing nitrate from water |
| US9994466B2 (en) | 2016-10-04 | 2018-06-12 | Georgia Aquarium Inc. | Removing nitrate from water |
| US10550024B2 (en) | 2016-10-04 | 2020-02-04 | Georgia Aquarium Inc. | Removing nitrate from water |
| US11040901B2 (en) | 2016-10-04 | 2021-06-22 | Georgia Aquarium Inc. | Removing nitrate from water |
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