JP2005040769A - Water-quality enhancement structure and water-quality enhancement method using it - Google Patents
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Abstract
Description
本発明は、農林水産業において植物、魚介類などの発育促進、収穫量向上などの生産性向上に寄与する水質改善作用を有する水質改善構造体およびこれを用いた水質改善方法に関し、特に、光触媒機能を利用した、水に浮くことのできる水質改善構造体およびこれを用いた水質改善方法に関するものである。 TECHNICAL FIELD The present invention relates to a water quality improvement structure having a water quality improvement effect that contributes to productivity enhancement such as growth promotion of plants, seafood and the like in the agriculture, forestry and fisheries industry, and a water quality improvement method using the same, in particular, photocatalyst. The present invention relates to a water quality improvement structure that can float on water using a function and a water quality improvement method using the same.
農産物の育成に必要とされる水や、養魚場などで使用される水の中に含まれる不必要な雑菌や藻類などの微生物、および有害化学物質を除去し、水質を改善した水を使用することが、農作物や魚介類の発育促進、収穫量向上などの生産性向上に大きく寄与することが知られている。 Use water that has been improved in water quality by removing unnecessary chemicals, algae, and other microorganisms and harmful chemicals contained in water used for growing agricultural products and in fish farms. It is known that this greatly contributes to the improvement of productivity such as promotion of growth of crops and seafood, and improvement of yield.
従来、このような寄与を得るための水質改善方法としては、水をフィルタに通して、水中に含まれる微生物および有害化学物質を除去する方法（例えば、特許文献１参照。）や、化学薬品により処理する方法などが用いられている。 Conventionally, as a water quality improvement method for obtaining such contribution, water is passed through a filter to remove microorganisms and harmful chemical substances contained in the water (for example, refer to Patent Document 1) or chemicals. The method of processing is used.
フィルタを使用する方法は、フィルタ自体が高価なばかりでなく、雑菌などの極微小なものを除去するには、ポンプを用いて圧力を加えないと処理効率が上がり難い。また、フィルタが目詰りすることがあるため、メンテナンスが必要になるなど、余分な労力や動力が必要となるという問題がある。 In the method using a filter, not only is the filter itself expensive, but in order to remove microscopic matters such as germs, it is difficult to increase the processing efficiency unless pressure is applied using a pump. Moreover, since the filter may be clogged, there is a problem that extra labor and power are required such as maintenance.
化学薬品により処理する方法は、速効性があるものの、薬品自体が農産物や魚貝類、さらには作業者にまで悪影響を及ぼすことがあるため、処理後、化学薬品を除去する工程が必要であるばかりでなく、化学薬品が残留していないかを確認する必要もある。また、この方法によって得られる効果は一時的なものであるため、定期的に繰り返して処理しなければならず、手間とコストが多く掛かるという問題がある。 Although the method of treating with chemicals is fast-acting, since the chemicals themselves can adversely affect agricultural products, fish and shellfish, and even workers, a process for removing the chemicals after treatment is required. It is also necessary to check whether chemicals remain. In addition, since the effect obtained by this method is temporary, there is a problem in that it has to be processed repeatedly on a regular basis, which requires much labor and cost.
農林水産業の従事者からは、動力を必要とすることなく、化学薬品の残留による影響を恐れる必要もなく、さらには、長期にわたりメンテナンスフリーで、安価に、農作物や魚介類の発育促進・収穫量向上に寄与する水質改善方法が望まれている。
本発明は、前記事情に鑑みてなされたもので、農林水産業において、余分な労力、動力、フィルタなどの高価な資材や化学薬品処理などを必要とすることなく、農作物や魚介類の発育促進、収穫量向上などに寄与するように水の水質を改善する水質改善構造体およびこれを用いた水質改善方法を提供することを目的とする。 The present invention has been made in view of the above circumstances, and in the agriculture, forestry and fisheries industry, it is necessary to promote the growth of crops and seafood without requiring extra labor, power, expensive materials such as filters, and chemical treatment. Another object of the present invention is to provide a water quality improvement structure for improving the quality of water so as to contribute to an increase in yield, and a water quality improvement method using the same.
本発明は、上記課題を解決するために、軸対称な形状からなる水に浮く構造体と、その表面の少なくとも一部に光触媒機能を有する光触媒膜とを備えた水質改善構造体であって、水に浮かべた際に、水面上と水面下との体積比率が５：９５〜９５：５となる水質改善構造体を提供する。 In order to solve the above problems, the present invention is a water quality improvement structure comprising a structure floating in water having an axisymmetric shape and a photocatalytic film having a photocatalytic function on at least a part of the surface thereof, Provided is a water quality improving structure in which the volume ratio between the water surface and the water surface is 5:95 to 95: 5 when floated on water.
上記構成の水質改善構造体において、前記構造体は光を透過する材料からなることが好ましい。 In the water quality improving structure having the above structure, the structure is preferably made of a material that transmits light.
本発明は、軸対称な形状からなる水に浮く構造体と、その表面の少なくとも一部に光触媒機能を有する光触媒膜とを備えた水質改善構造体であって、水に浮かべた際に、水面上と水面下との体積比率が５：９５〜９５：５となる水質改善構造体を被処理水に浮かべ、被処理水を前記光触媒膜に接触させて、被処理水を浄化する水質改善方法を提供する。 The present invention is a water quality improvement structure comprising a structure that floats in water having an axisymmetric shape and a photocatalytic film having a photocatalytic function on at least a part of the surface of the structure. A water quality improving method for purifying water to be treated by floating a water quality improving structure having a volume ratio of 5:95 to 95: 5 on the water to be treated and bringing the water to be treated into contact with the photocatalyst film. I will provide a.
本発明の水質改善構造体を、水田や畑作用の貯水池・タンクをはじめ、水耕栽培用水、淡水・海水での魚貝類の養殖場内、さらには、観賞用水棲生物の水槽などで使用することにより、自然の太陽光などの光を有効に活用でき、特別な動力や有害な化学薬品を使用することなく、長期にわたって水質を浄化・改善する機能を発揮し続けることができる。また、特別なメンテナンスもほとんど不要となり、効果的に水質浄化・改善が行われ、農作物や魚介類の発育促進・収穫量向上、さらには、観賞用水棲生物の長寿命化などの効果を得ることができる。 The water quality improvement structure of the present invention is used in paddy fields, upland reservoirs and tanks, hydroponic water, freshwater and seawater fish farms, and aquariums for ornamental aquatic organisms. Therefore, it is possible to effectively utilize light such as natural sunlight, and to continue to exhibit the function of purifying and improving water quality over a long period of time without using special power or harmful chemicals. In addition, almost no special maintenance is required, and water quality purification and improvement are carried out effectively, promoting the growth of crops and seafood, improving yields, and extending the life of ornamental aquatic organisms. Can do.
以下、本発明を詳しく説明する。
本発明の水質改善構造体は、軸対称な形状からなる水に浮く構造体と、その表面の少なくとも一部に光触媒機能を有する光触媒膜とを備えた水質改善構造体であって、水に浮かべた際に、水面上と水面下との体積比率が５：９５〜９５：５となるものである。
Hereinafter, the present invention will be described in detail.
The water quality improvement structure of the present invention is a water quality improvement structure comprising a structure floating in water having an axisymmetric shape and a photocatalytic film having a photocatalytic function on at least a part of the surface, and floats on water. In this case, the volume ratio between the water surface and the water surface is 5:95 to 95: 5.
本発明の水質改善構造体を構成する構造体としては、軸対称な形状からなる水に浮くものが用いられる。ここで、軸対称な形状とは、１つの軸の回りにある図形を回転させてなる形状のことであり、例えば、球形、円錐形、円柱形、円筒形、ラグビーボール形、あるいは、これらの形状を、回転軸を同じくして組み合わせたものなどが挙げられる。
また、水に浮く構造としては、中空体、多孔質体などが挙げられる。
As the structure constituting the water quality improving structure of the present invention, a structure floating in water having an axisymmetric shape is used. Here, the axisymmetric shape is a shape formed by rotating a figure around one axis. For example, a spherical shape, a conical shape, a cylindrical shape, a cylindrical shape, a rugby ball shape, or these shapes For example, a combination of shapes with the same rotation axis.
Moreover, a hollow body, a porous body, etc. are mentioned as a structure which floats on water.
このような構造体をなす材料としては、樹脂、金属、ガラス、木などが用いられる。これらの中でも、無色透明な樹脂、ガラスなどの光を透過する材料が好ましい。 As a material forming such a structure, resin, metal, glass, wood, or the like is used. Among these, colorless and transparent resins and materials that transmit light such as glass are preferable.
本発明では、構造体として、例えば、軸対称な形状の樹脂、金属、ガラス、木などからなる多孔質体、中空体などが用いられる。具体的に、多孔質体としては、発泡スチロール、軽石などが挙げられ、中空体としては、円筒形のＰＥＴボトル、ゴム製や金属製のボールなどが挙げられる。これらの中でも、無色透明な樹脂、ガラスなどの光を透過する材料からなる中空体が好ましい。 In the present invention, for example, a porous body or hollow body made of resin, metal, glass, wood, or the like having an axially symmetric shape is used as the structure. Specifically, examples of the porous body include styrene foam and pumice, and examples of the hollow body include a cylindrical PET bottle, rubber and metal balls, and the like. Among these, a hollow body made of a material that transmits light such as a colorless and transparent resin or glass is preferable.
光触媒膜を構成する光触媒としては、光により励起されて強力な酸化還元能力を発揮するものであればいかなるものでも適用できるが、化学的に安定で、かつ比較的安価なものとして、紫外領域の光により励起される二酸化チタンが好ましく用いられる。
また、触媒活性を高めるために、白金、パラジウムなどの白金族をはじめとする金属を担持させた光触媒を用いることもできる。さらには、紫外領域のみならず、可視領域においても触媒活性を発現する光触媒も、光のエネルギーをより有効に活用できることから、好ましい。
Any photocatalyst that constitutes the photocatalyst film can be applied as long as it is excited by light and exhibits a strong redox ability, but is chemically stable and relatively inexpensive, Titanium dioxide excited by light is preferably used.
In addition, in order to increase the catalytic activity, a photocatalyst carrying a metal such as platinum group such as platinum or palladium can be used. Furthermore, a photocatalyst that exhibits catalytic activity not only in the ultraviolet region but also in the visible region is preferable because it can utilize light energy more effectively.
光触媒膜は、上述の構造体の表面の少なくとも一部に設けられていればよいが、光触媒機能の観点から、構造体の表面全面に設けられていることが望ましい。
また、構造体として、光を透過する材料からなるものを用いる場合には、構造体の表面から内面に入射した光が、水面下にある光触媒膜にまで届くように、光触媒膜の厚みを光が透過する程度に薄くしてもよい。さらには、光触媒膜を、構造体の表面に点状、線状、帯状、格子状など部分的に設けてもよい。
また、構造体が多孔質体の場合には、孔の内部にも光触媒膜を設けてもよい。
The photocatalyst film may be provided on at least a part of the surface of the structure described above, but it is desirable that the photocatalyst film is provided on the entire surface of the structure from the viewpoint of the photocatalytic function.
In addition, when a structure made of a material that transmits light is used, the thickness of the photocatalyst film is set so that light incident on the inner surface from the surface of the structure reaches the photocatalyst film below the water surface. It may be made thin enough to transmit. Furthermore, the photocatalytic film may be partially provided on the surface of the structure, such as a dot shape, a line shape, a belt shape, or a lattice shape.
Further, when the structure is a porous body, a photocatalytic film may also be provided inside the pores.
光触媒膜を構造体の表面に設ける方法としては、光触媒を、バインダー樹脂などを用いて構造体の表面に直接塗布する方法、光触媒を構造体の表面に焼き付ける方法、ゾルゲル法を用いて構造体の表面に光触媒膜を形成する方法、構造体形成時に、構造体をなす材料に光触媒練り込んで構造体表面に光触媒膜を形成する方法などが用いられる。また、別途、光触媒とバインダー樹脂を混合してなる光触媒機能剤を樹脂製フィルム上に塗布して光触媒膜を形成してから、構造体の表面にこの光触媒膜を有するフィルムを固着してもよい。 As a method of providing a photocatalyst film on the surface of the structure, a method of directly applying the photocatalyst to the surface of the structure using a binder resin or the like, a method of baking the photocatalyst on the surface of the structure, or a sol-gel method For example, a method of forming a photocatalytic film on the surface, a method of forming a photocatalytic film on the surface of the structure by kneading the photocatalyst into a material forming the structure, and the like are used. Alternatively, a photocatalytic functional agent obtained by mixing a photocatalyst and a binder resin may be applied on a resin film to form a photocatalytic film, and then the film having the photocatalytic film may be fixed to the surface of the structure. .
本発明の水質改善構造体は、水に浮かべることができるから、自然の風や水流によって水上を移動することができるため、余分な労力、動力を必要とせずに広範囲の水との接触が可能となる。また、この水質改善構造体は軸対称な形状であるから、風や水流によって、水質改善構造体自体が容易に回転するので、水質改善構造体の表面に設けられた光触媒膜が未処理の被処理水と接触し易く、かつ水質改善構造体の水中にある部分の表面付近の水を、水質改善構造体の回転と共に水面上に持ち上げることで、被処理水を水質改善構造体表面の広い範囲で効率的に浄化することができる。 Since the water quality improving structure of the present invention can float on water, it can be moved on the water by natural wind or water flow, so it can be contacted with a wide range of water without requiring extra labor and power. It becomes. Further, since the water quality improvement structure has an axisymmetric shape, the water quality improvement structure itself is easily rotated by wind and water flow, so that the photocatalyst film provided on the surface of the water quality improvement structure is untreated. The water near the surface of the water quality improvement structure that is easily in contact with the treated water is lifted onto the water surface along with the rotation of the water quality improvement structure, so that the water to be treated is spread over a wide area on the surface of the water quality improvement structure. Can be purified efficiently.
また、本発明の水質改善構造体は、水に浮かべた際に、水面上と水面下の体積比率が５：９５〜９５：５となるように調整されているから、風や水流によって、容易に水上を移動し、回転することができ、水と光触媒膜が接触する際に受ける光の量や強度が適度なものとなり、水の浄化効率が向上する。 In addition, the water quality improving structure of the present invention is adjusted so that the volume ratio between the water surface and the water surface is 5:95 to 95: 5 when floated on water. Therefore, the amount and intensity of light received when the water and the photocatalyst film come into contact with each other become appropriate, and the purification efficiency of water is improved.
水面上の水質改善構造体の体積比率が５未満では、水面下の体積比率が大きくなり過ぎて、水の抵抗が増して水質改善構造体が回転し難くなる。その結果、未処理の被処理水との接触効率が低下するだけでなく、ほとんどの光触媒膜が水中に没するので、光触媒膜に届く光の量や強度が水の吸収により減少して、水の浄化効率も低下する。一方、水面上の体積比率が９５を超えると、光触媒膜と水との接触効率が低くなり過ぎるだけでなく、弱い風によっても、水質改善構造体が被処理水の存在する水場から吹き飛ばされてしまうおそれがある。 When the volume ratio of the water quality improvement structure on the water surface is less than 5, the volume ratio under the water surface becomes too large, the resistance of water increases, and the water quality improvement structure becomes difficult to rotate. As a result, not only the contact efficiency with untreated water is lowered, but also most of the photocatalyst film is submerged in water, so that the amount and intensity of light reaching the photocatalyst film is reduced by water absorption, and water The purification efficiency is also reduced. On the other hand, when the volume ratio on the water surface exceeds 95, not only the contact efficiency between the photocatalyst film and the water becomes too low, but also the water quality improving structure is blown away from the water field where the water to be treated is present even by a weak wind. There is a risk that.
本発明の水質改善構造体を水に浮かべた際に、水面上と水面下の体積比率が５：９５〜９５：５となるように調整する方法としては、適当な比重の材料からなる構造体を用いたり、比重の軽いものを組み合わせるなど水質改善構造体の構成により調整することなどが挙げられ、例えば、水質改善構造体を構成する構造体がＰＥＴボトルなどの中空体の場合には、中空体内に水などの流動性の充填物を適量注入する方法が挙げられる。このように、中空体内に流動性の充填物を注入すれば、この充填物は水質改善構造体の水面下となる側に常に存在するように流動するから、水質改善構造体の回転を妨げることはない。 When the water quality improving structure of the present invention is floated on water, as a method for adjusting the volume ratio between the water surface and the water surface to be 5:95 to 95: 5, a structure made of a material having an appropriate specific gravity Or by adjusting the structure of the water quality improvement structure such as a combination of light specific gravity, for example, when the structure constituting the water quality improvement structure is a hollow body such as a PET bottle, A method of injecting an appropriate amount of fluid filler such as water into the body can be mentioned. In this way, when a fluid filler is injected into the hollow body, the filler flows so as to always exist on the side of the water quality improvement structure that is below the surface of the water, thus preventing the rotation of the water quality improvement structure. There is no.
さらに、構造体を、光を透過する材料からなるものとすることで、構造体の表面から内面に入射した光が、水面下にある光触媒膜にも届くようになり、水質改善構造体全体で水質改善作用を発揮することができる。 Furthermore, by making the structure of a material that transmits light, light incident on the inner surface from the surface of the structure can reach the photocatalyst film below the water surface. The water quality improving effect can be exhibited.
また、本発明の水質改善構造体は、複数の水質改善構造体を並列に連ねた筏様のものとしてもよい。このような構成とすれば、水質改善構造体は一度に広範囲の水との接触が可能となるため、水の浄化効率が向上する。 The water quality improvement structure of the present invention may be a bowl-like structure in which a plurality of water quality improvement structures are connected in parallel. With such a configuration, the water quality improving structure can be brought into contact with a wide range of water at a time, so that the water purification efficiency is improved.
次に、本発明の水質改善方法について説明する。
本発明の水質改善方法は、上記の本発明の水質改善構造体を被処理水に浮かべ、被処理水を光触媒膜に接触させて、被処理水を浄化するものである。
Next, the water quality improvement method of the present invention will be described.
The water quality improvement method of the present invention purifies the water to be treated by floating the water quality improving structure of the present invention on the water to be treated and bringing the water to be treated into contact with the photocatalyst film.
水質改善構造体を被処理水に浮かべることにより、被処理水が光触媒膜に接触して、光触媒の強力な酸化還元能力によって、被処理水が浄化される。また、水質改善構造体は風や水流によって水上を移動することができるため、余分な労力、動力を必要とせずに広範囲の水との接触が可能となる。さらに、風や水流によって、水質改善構造体自体が容易に回転するので、水質改善構造体の表面に設けられた光触媒膜が未処理の被処理水と容易に接触するので、水を効率的に浄化することができる。 By floating the water quality improving structure on the water to be treated, the water to be treated comes into contact with the photocatalyst film, and the water to be treated is purified by the strong redox ability of the photocatalyst. In addition, since the water quality improving structure can move on the water by wind or water flow, it can be contacted with a wide range of water without requiring extra labor and power. Furthermore, since the water quality improvement structure itself is easily rotated by wind and water flow, the photocatalyst film provided on the surface of the water quality improvement structure easily comes into contact with untreated water, so that the water can be efficiently Can be purified.
以下、実施例により本発明をさらに具体的に説明するが、本発明は以下の実施例に限定されるものではない。 EXAMPLES Hereinafter, although an Example demonstrates this invention further more concretely, this invention is not limited to a following example.
（実施例１）
厚み５０μｍのポリエステルフィルムの片面に、シリケートを主成分とし、バインダー樹脂溶液を混合してなる基剤を塗布してアンダー層を形成した。続いて、このアンダー層の上に、アナターゼ型二酸化チタンを主成分とし、上記基剤に用いられるバインダー樹脂溶液を混合してなる光触媒機能剤をコーティング法にて塗布してトップ層を形成し、アンダー層とトップ層とからなる光触媒膜を有する光触媒機能フィルムを作製した。
得られた光触媒機能フィルムにおける光触媒（アナターゼ型二酸化チタン）の付着量は、０．１ｇ／ｍ２であった。
この光触媒機能フィルムを、容積５００ｍＬの円筒形ＰＥＴボトルの側面全面に、耐水性接着剤によって密着させて、表面に光触媒膜を有する、軸対称な形状の水質改善構造体を得た。
(Example 1)
An under layer was formed on one side of a 50 μm thick polyester film by applying a base composed mainly of silicate and mixed with a binder resin solution. Subsequently, on this under layer, a top layer is formed by applying a photocatalytic functional agent composed mainly of anatase-type titanium dioxide and mixing a binder resin solution used for the base by a coating method, A photocatalytic functional film having a photocatalytic film composed of an under layer and a top layer was produced.
The adhesion amount of the photocatalyst (anatase type titanium dioxide) in the obtained photocatalytic functional film was 0.1 g / m 2 .
This photocatalytic functional film was adhered to the entire side surface of a cylindrical PET bottle having a volume of 500 mL with a water-resistant adhesive to obtain an axisymmetric water quality improving structure having a photocatalytic film on the surface.
次に、ＰＥＴボトル内に水を入れて、水に浮かべた際の水面上と水面下との体積比率が、５０：５０（実施例Ａとする。）、１：９９（比較例Ａ−１とする。）、９８：２（比較例Ａ−２とする。）となるように調整した水質改善構造体を、それぞれ用意した。 Next, when water is put into a PET bottle and floated in water, the volume ratio between the water surface and the water surface is 50:50 (referred to as Example A), 1:99 (Comparative Example A-1). ), 98: 2 (referred to as Comparative Example A-2), water quality improvement structures adjusted to be respectively prepared.
次に、広さ５０ｃｍ×５０ｃｍ、深さ２０ｃｍの水槽を４つ用意して、各水槽に同じ農業用水を満たし、上記水質改善構造体のそれぞれを各水槽に１個ずつ浮かべた。残りの１つの水槽には何も浮かべずに、原水のままとした（比較例Ａ−３とする。）。 Next, four water tanks having a size of 50 cm × 50 cm and a depth of 20 cm were prepared, each tank was filled with the same agricultural water, and each of the water quality improvement structures was floated on each water tank. Nothing floated in the remaining one aquarium, and the raw water was left as it was (Comparative Example A-3).
晴天の日に、これらの水槽を屋外に並べて、太陽光下に８時間放置した後、各水中の雑菌数を調べた。
水中の雑菌数の測定は、培養法（厚生省令第６９号）に従って行った。
結果を表１に示す。
On a sunny day, these aquariums were arranged outdoors and left under sunlight for 8 hours, and then the number of germs in each water was examined.
The number of miscellaneous bacteria in water was measured according to the culture method (Ministry of Health and Welfare Ordinance No. 69).
The results are shown in Table 1.
表１の結果から、水質改善構造体を用いていない比較例Ａ−３と比較すると、比較例Ａ−２以外では、雑菌数の減少が見られた。しかしながら、比較例Ａ−１では雑菌数の減少が少ないのに対して、実施例Ａでは雑菌数が大きく減少していることが確認された。
また、比較例Ａ−２では、水面下の体積比率が小さ過ぎるため、試験途中で、風により水質改善構造体が水槽外へ飛ばされてしまったために、水の浄化があまり行われず、原水（比較例Ａ−３）と同程度の結果となったと考えられる。
From the result of Table 1, when compared with Comparative Example A-3 which does not use the water quality improving structure, a decrease in the number of germs was observed except for Comparative Example A-2. However, it was confirmed that in Example A-1, the number of miscellaneous bacteria was small, whereas in Example A, the number of miscellaneous bacteria was greatly reduced.
Moreover, in Comparative Example A-2, since the volume ratio under the surface of the water is too small, the water quality improvement structure was blown out of the water tank by the wind during the test. It is thought that the result was comparable to that of Comparative Example A-3).
（実施例２）
実施例１で作製した光触媒機能フィルムを、容積２Ｌの円筒形ＰＥＴボトルの側面全面に、耐水性接着剤によって密着させて、表面に光触媒膜を有する、軸対称な形状の水質改善構造体を得た。
次に、ＰＥＴボトル内に水を入れて、水に浮かべた際の水面上と水面下との体積比率が、５０：５０となるように調整した。
次に、広さ８ｍ×５ｍ、深さ１ｍの畑作用灌漑用水の貯水池を仕切りで二分して、その一方にはこの水質改善構造体を１０個浮かべ、他方には水質改善構造体を浮かべなかった。
(Example 2)
The photocatalytic functional film produced in Example 1 was adhered to the entire side surface of a cylindrical PET bottle having a volume of 2 L with a water-resistant adhesive to obtain an axisymmetric shape water quality improvement structure having a photocatalytic film on the surface. It was.
Next, water was put into a PET bottle, and the volume ratio between the water surface and the water surface when floating on water was adjusted to 50:50.
Next, a field irrigation water reservoir of 8m x 5m in depth and 1m in depth is divided into two, and one of these 10 water quality improvement structures floats on one side, and no water quality improvement structure floats on the other side. It was.
水質改善構造体を用いて水質の改善を行った畑作用灌漑用水（実施例Ｂとする。）と、水質の改善を行っていない畑作用灌漑用水（比較例Ｂとする。）とをそれぞれ用いて、ニラの栽培を行い、その成育の状態を観察した。
ニラの成育状態の評価は、ほぼ同じ丈のニラの苗を畑に植え付けて、実施例Ｂまたは比較例Ｂの畑作用灌漑用水を用いて栽培し、植え付けから２５日後にニラを収穫してニラの平均丈を測定することによって行った。結果を表２に示す。
Field action irrigation water that has been improved in water quality using the water quality improving structure (referred to as Example B) and field action irrigation water that has not been improved in water quality (referred to as Comparative Example B), respectively. The leek was cultivated and the state of its growth was observed.
The evaluation of the growth status of leek is that leek seedlings of approximately the same length are planted in the field, cultivated using the field action irrigation water of Example B or Comparative Example B, and leek is harvested 25 days after planting. This was done by measuring the average height of the. The results are shown in Table 2.
表２に示したように、実施例Ｂでは、収穫時のニラの平均丈が比較例Ｂより４割も長く、ニラの成育に明らかに差があることが確認された。 As shown in Table 2, in Example B, the average height of leek at harvest was 40% longer than Comparative Example B, and it was confirmed that there was a clear difference in growth of leek.
また、実施例Ｂおよび比較例Ｂの畑作用灌漑用水中の雑菌数を、実施例１と同様の方法で測定した。結果を表３に示す。 In addition, the number of germs in the field irrigation water of Example B and Comparative Example B was measured in the same manner as in Example 1. The results are shown in Table 3.
表３に示したように、実施例Ｂでは、水質改善構造体による水質改善作用により、畑作用灌漑用水中の雑菌数が大幅に減少していることが分かった。このような雑菌数の大幅な減少が、ニラの成育促進に大きく寄与していると考えられる。 As shown in Table 3, in Example B, it was found that the number of germs in the field irrigation water was significantly reduced by the water quality improvement effect of the water quality improvement structure. Such a significant decrease in the number of miscellaneous bacteria is considered to have greatly contributed to the promotion of leek growth.
（実施例３）
直径３０ｃｍ、長さ１ｍの無色透明円筒形プラスチックの側面全面に、実施例１で調製した光触媒機能剤をスプレー法にて塗布し、無色透明円筒形プラスチックの側面に直接、光触媒膜を形成して、軸対称な形状の水質改善構造体を得た。
得られた水質改善構造体における光触媒（アナターゼ型二酸化チタン）の付着量は、０．３ｇ／ｍ２であった。
(Example 3)
The photocatalytic functional agent prepared in Example 1 was applied to the entire side surface of a colorless transparent cylindrical plastic having a diameter of 30 cm and a length of 1 m by spraying to form a photocatalytic film directly on the side of the colorless transparent cylindrical plastic. A water quality improvement structure having an axisymmetric shape was obtained.
The adhesion amount of the photocatalyst (anatase type titanium dioxide) in the obtained water quality improving structure was 0.3 g / m 2 .
この水質改善構造体を、長手方向に２本、長手方向と垂直な方向に５本の計１０本を配列させて、それぞれをロープで繋いで筏様の水質改善構造体を作製した。この際、各々の水質改善構造体の回転を妨げないように、ロープの締め付け具合には余裕を持たせた。 A total of ten water quality improvement structures, two in the longitudinal direction and five in the direction perpendicular to the longitudinal direction, were arranged by connecting them with ropes, and a water-like water quality improvement structure was produced. At this time, an allowance was given to the tightening degree of the rope so as not to prevent the rotation of each water quality improvement structure.
この筏様の水質改善構造体から、牡蠣の稚貝を着けたロープを海水中に吊下げて養殖を行い、牡蠣の成育の状態を観察した（実施例Ｃとする。）。この際、水質改善構造体の水面上と水面下との体積比率は、６０：４０であった。実施例Ｃとの比較のために、筏様の水質改善構造体を用いずに、従来の養殖用筏から、牡蠣の稚貝を着けたロープを海水中に吊下げて養殖を行い、牡蠣の成育の状態を観察した（比較例Ｃとする。）。 From this shark-like water quality improving structure, a rope with oyster oysters was suspended in seawater and cultured, and the state of oyster growth was observed (referred to as Example C). At this time, the volume ratio between the water surface and the water surface of the water quality improving structure was 60:40. For comparison with Example C, a rope with oyster oysters was hung in the seawater from a conventional aquaculture ridge without using a water quality improvement structure like a shark. The state of growth was observed (referred to as Comparative Example C).
牡蠣の成育状態の評価は、ほぼ同じ大きさの牡蠣の稚貝をロープに着け、養殖開始から１ヶ月毎に牡蠣の大きさを測定し、牡蠣の１ヶ月当たりの平均成育速度を測定することによって行った。結果を表４に示す。 Evaluation of the growth of oysters is to measure the average growth rate per month of oysters by measuring the size of oysters every month from the start of aquaculture, wearing oyster shells of approximately the same size on a rope. Went by. The results are shown in Table 4.
表４に示したように、実施例Ｃでは、牡蠣の成育速度が比較例Ｃより３割以上も促進されることが確認された。これも、海水に浮かべた筏様の水質改善構造体により、その付近の海水の水質が改善されたためと考えられる。 As shown in Table 4, in Example C, it was confirmed that the growth rate of oysters was promoted by 30% or more compared with Comparative Example C. This is also thought to be due to the improvement of the water quality of the seawater in the vicinity by the coral-like water quality improvement structure floated on the seawater.
本発明の水質改善構造体は、プールなどの水の雑菌抑制といった用途にも適用可能である。このような用途では、化学薬品を使用する必要がなくなるから、化学薬品によって人体の健康を害することなく、安全に水中の雑菌を抑制することができる。
The water quality improving structure of the present invention can also be applied to uses such as suppression of bacteria in water such as a pool. In such an application, it is not necessary to use chemicals, and therefore, germs in water can be safely suppressed without harming human health.
Claims (3)
水に浮かべた際に、水面上と水面下との体積比率が５：９５〜９５：５となることを特徴とする水質改善構造体。 A water quality improving structure comprising a structure floating in water having an axisymmetric shape and a photocatalytic film having a photocatalytic function on at least a part of the surface thereof,
A water quality improving structure characterized in that, when floated on water, the volume ratio of the water surface to the water surface is 5:95 to 95: 5.
A water quality improvement structure comprising an axially symmetric structure floating in water and a photocatalytic film having a photocatalytic function on at least a part of the surface, when floating on water, above and below the water surface The water quality improvement structure is characterized in that a water quality improving structure having a volume ratio of 5:95 to 95: 5 is floated on the water to be treated, and the water to be treated is brought into contact with the photocatalyst film to purify the water to be treated. Method.
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