JP3532654B2 - Treatment method of nutrient solution in hydroponics - Google Patents
Treatment method of nutrient solution in hydroponicsInfo
- Publication number
- JP3532654B2 JP3532654B2 JP07755095A JP7755095A JP3532654B2 JP 3532654 B2 JP3532654 B2 JP 3532654B2 JP 07755095 A JP07755095 A JP 07755095A JP 7755095 A JP7755095 A JP 7755095A JP 3532654 B2 JP3532654 B2 JP 3532654B2
- Authority
- JP
- Japan
- Prior art keywords
- nutrient solution
- fiber
- activated carbon
- fibrous activated
- hydroponics
- 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 - Fee Related
Links
Classifications
-
- Y02P60/216—
Description
【発明の詳細な説明】
【０００１】
【産業上の利用分野】本発明は，野菜，果物，花等の植
物の水耕栽培における養液の処理方法に関するものであ
り, さらに詳しくは, 水耕栽培で使用される養液の長期
間にわたる循環使用が可能となる養液の処理方法に関す
るものである。
【０００２】
【従来の技術】一般に，植物は畑や田のように土を培地
として栽培され，水分や養分は土を介して根から吸収さ
れる。しかしながら，水分や養分の供給は土に水や養分
を散布して行うため植物に吸収される効率が低く，水分
や養分のロスが大きいという問題がある。
【０００３】一方，野菜，果物，花などの植物の水耕栽
培が近年盛んに利用されるようになっている。水耕栽培
は土の代わりにロックウール，プラスチックの発泡体，
繊維状物等を培地として使用し，窒素，燐酸，カリとい
った植物に必要な養分は水に溶かして所定の成分濃度に
調整し，培地にポンプで供給する方法がとられている。
このため水耕栽培は，省力化, 機械化ができる，すな
わち, 鍬，鋤などによる労働は必要がなく，除草等の手
間も不要である, 連作障害をなくすための土替え，場
所の変更が不要である, 水に肥料を溶解して循環させ
るため，肥料の流出等の無駄がなく，必要な養分を必要
なだけ効率的に与えることができる, 気象条件に左右
され難い, 栽培の密度を高くすることが可能であり，
土地の有効利用と単位面積当たりの収穫量増大が期待で
きる, 等々の利点を有している。
【０００４】水耕栽培は, 以上のような利点を生かし，
近年急速に栽培面積が多くなっており，さらに野菜等に
おいては工場化による大量生産も進んでいる。しかしな
がら，水耕栽培が種々の植物に適用されるようになるに
つれ，養液を長期間交換せずに追肥のみで運転していく
と，植物によっては生育が著しく遅れる生長不良の問題
が発生している。現状ではこのような問題が生じる前に
経験的に養液を新しいものに交換する等の対策が取られ
ているが，このような対策では栽培のコストが上昇する
という問題がある。しかも，養液を交換する場合, 栄養
分の高い水が直接河川に排出されると, 河川や湖沼の富
栄養化を招くため，養液を処理して排出することが必要
となってきている。
【０００５】水耕栽培における植物の生育不良の原因
は，栽培中の植物から分泌されるフェノール系物質や有
機酸物質といった生育阻害物質が養液の中に蓄積される
ことに起因すると考えられており，使用した養液を粒状
活性炭で処理し，植物の生育を改良する試みもなされて
いる。
【０００６】しかしながら，粒状活性炭を多量に使用す
る場合，液の抵抗が大きくて通液し難い, 粒状活性炭の
粉末が液中に洩れる，また洩れ対策として濾過フィルタ
ーを細かくすると詰まりが生じて液圧が上昇し，通液し
難くなる，処理後の粒状活性炭は粉塵爆発の危険がある
ので焼却できず，産業廃棄物となるので処理コストが高
くなる，さらには粒状活性炭は細孔の分布が広く，しか
も大孔径のものが多く分布しているので，植物に有用な
養分まで吸着してしまい, 養液に補給する養分の量が多
くなるばかりか, 目的とする生育阻害物質の吸着能力が
低下する, 等々の問題があった。
【０００７】
【発明が解決しようとする課題】本発明は，上記の問題
を解決し，水耕栽培における養液を長期間にわたり循環
使用しても植物が生育不良なることがなく，しかも処理
層は粒状活性炭のような使用上の問題がない, 水耕栽培
における養液の処理方法を提供することを技術的な課題
とするものである。
【０００８】
【課題を解決するための手段】本発明者は，上記の課題
を解決するために鋭意研究した結果，繊維状活性炭は植
物の生育阻害物質を選択的に良好に吸着する性質があ
り，繊維状活性炭を主成分とする処理層で養液を濾過す
れば，養液の交換寿命を著しく長くすることが可能で，
植物の生育も良好となり, しかも粒状活性炭のような使
用上の問題もないことを見い出して本発明に到達した。
【０００９】すなわち，本発明は，植物類の水耕栽培に
おいて使用される養液を，比表面積が 500 〜 2000m 2 /g,
細孔直径 30 Å以下の細孔の占める容積の割合が，全細孔
容積の 90 ％以上である繊維状活性炭と、低融点ポリエス
エル繊維，低融点ポリエステルを鞘成分 , 高融点ポリエ
ステルを芯成分とする複合繊維，ポリオレフィン繊維，
ポリエチレンを鞘成分 , ポリプロピレンを芯成分とする
複合繊維，ガラス繊維、セラッミクス繊維，天然繊維か
らなる群から選ばれた少なくとも１種の繊維からなる処
理層を通して循環させることを特徴とする水耕栽培にお
ける養液の処理方法を要旨とするものである。
【００１０】以下, 本発明について詳細に説明する。
【００１１】本発明において，水耕栽培で使用される養
液を通過させる処理層の主成分は繊維状活性炭であり，
繊維状活性炭の原料は特に限定されるものではなく，石
炭ピッチ，石油ピッチ，レーヨン，フェノール繊維，ア
クリル繊維等から得られるものであればいずれでもよ
い。繊維状活性炭の比表面積は, ＢＥＴ法による測定値
で 500〜2000m2/gが好ましい。比表面積が 500m2/g未満
になると，細孔が少なくなり, 生育阻害物質の吸着量が
低下しやすくなる。また, 比表面積が 2000m2/gを超え
ると細孔が大きくなり, 植物に有用な養分まで吸着され
やすくなる。
【００１２】さらに，繊維状活性炭は, Ｂ, Ｊ, Ｈ法
（Barrett,Joyner,Halendaらの方法）により求めた細孔
分布において, 細孔直径30Å以下の細孔の占める容積の
割合が，全細孔容積の90％以上であることが好ましい。
細孔容積が90％未満になると，植物に有用な養分を吸着
する大孔径の細孔が多くなり, 例えば一般に使用される
粒状や粉末状活性炭のように直径30Å以上の細孔が20〜
35％存在すると，生育阻害物質の選択吸着性が低くな
り，しかも有用な養分までも吸着し，養液に補給する養
分の必要量が多くなりやすい。
【００１３】本発明で用いる処理層としては，繊維状活
性炭の原綿やシートで形成して槽に詰めたもの，繊維状
活性炭を主成分とするシートを積層したもの，前記シー
トを同心円状に円筒状に巻き付けてカートリッジとした
もの，繊維状活性炭とバインダーを水中に分散させ，金
型に導入することにより円筒状あるいは円柱状のカート
リッジに成形したもの，前記シートを波型状やハニカム
状に成形したもの等を用いることができる。その中で
は，繊維状活性炭を主成分とするシートを巻き付けて形
成したカートリッジが, 詰まりも少なく，取扱い性にも
優れている。このカートリッジを処理層として用いる場
合，カートリッジをハウジングに取付け，カートリッジ
の外層から内層に養液を通液するのが好ましい。
【００１４】カートリッジの製造方法としては，繊維状
活性炭と他の素材を乾式法あるいは湿式抄紙法で混合し
てシート状に成形し，そのシートを同心円筒状に巻き付
ける方法が好ましい。繊維状活性炭とともに用いる他の
素材としては，低融点ポリエスエル繊維，低融点ポリエ
ステルを鞘成分, 高融点ポリエステルを芯成分とする複
合繊維，ポリオレフィン繊維，ポリエチレンを鞘成分,
ポリプロピレンを芯成分とする複合繊維等のバインダー
繊維，ガラス繊維やセラッミクス繊維等の無機繊維，天
然繊維等があげられる。繊維状活性炭にこれらの一種又
は二種以上を配合するが，配合割合は繊維状活性炭40〜
90重量％，他素材60〜10重量％が好ましい。繊維状活性
炭の量が40重量％未満になると, 生育阻害物質の吸着効
果が低下しやすい。また, 繊維状活性炭の量が90重量％
を超えると，カートリッジに成形し難くなる。
【００１５】繊維状活性炭を主成分とする処理層で水耕
栽培の養液をろ過処理しながら長期間使用すると, 養液
は栄養分が高いので，処理層の中に微生物が繁殖し，詰
まり等の問題が生じる場合がある。このような問題の発
生を防ぐには, 難水溶性銀化合物を0.01〜10重量％添着
及び／又は含有させた繊維状活性炭で処理層を形成した
り，抗菌性銀化合物を含有させたバインダー繊維を用い
てカートリッジ等の処理層を形成すれば，処理層の中に
微生物が繁殖するのを防止することができる。
【００１６】ここで，難水溶性銀化合物としては，塩化
銀，酸化銀が簡便に得られるので好ましい。抗菌性銀化
合物としては，酸化銀，銀吸着ゼオライトが好ましく用
いられる。これら銀化合物を繊維状活性炭や処理層に添
着したり含有させる手段は, 公知の方法を採用すること
ができる。
【００１７】一般に水耕栽培において, 養液は，養液調
製用の養液タンクからポンプにより水耕栽培ベッドの各
培地に送液される。植物に供給された後の養液は, 排液
管に集められて養液タンクに返送され，養分を調整され
た後, 再び各培地に送液され, 養液は循環して使用され
る。
【００１８】上記において，本発明では，繊維状活を主
成分とする処理層を設けた槽を排液管の途中に設けた
り, 養液タンクと処理層を設けた槽の間で養液が循環す
るように養液の循環系とは別の系を設け, 養液を処理層
に通して植物の生育阻害物質を吸着した後，生育阻害物
質を除去した養液を養液タンクに送液し，次いで, 培地
に送液するものである。
【００１９】
【実施例】次に，本発明を実施例により具体的に説明す
る。
【００２０】実施例１
比表面積1650m2/g，細孔容積0.84ml/g，細孔分布から求
めた細孔直径30Å以下の細孔の占める容積の割合が全細
孔容積の95％である石炭ピッチ系繊維状活性炭60重量％
と, 低融点ポリエステルを鞘成分, 高融点ポリエステル
を芯成分とする複合型バインダー繊維（ユニチカ社製メ
ルティー＜４０８０＞）40重量％をカード加工により混
繊し，目付け40g/m2のシートを製造した。
【００２１】このシートを外径30mmの円筒状鉄製パイプ
に同心円状に巻き付けて外径65mmの円筒状カートリッジ
を作成し，次いで熱処理した後， 250mm毎に切断して内
径30mm，外径65mm，長さ 250mmで，繊維状活性炭を55g
含有する円筒状カートリッジを得た。
【００２２】得られた円筒状カートリッジを処理層とし
て用い, ミツバの水耕栽培の養液 500リットルの循環系
に取付け，６リットル /min の通液速度で通液した。こ
こで，ミツバは関西白茎ミツバを用いた。また，養液
は, 大塚ハウス肥料１号，２号(商品名) を用い，園試
処方の濃度に調整した新液を用いたものと，活性炭等を
使用しない状態でミツバを３連作した連作液を用いたも
のについて行った。
【００２３】30日間にわたって水耕栽培した結果，ミツ
バの生育はいずれも良好であり，新液に対する連作液の
ミツバの生育重量比は98％であった。運転状況は, どち
らの液も圧の上昇はなく，炭塵の発生もなくて良好であ
った。また，処理済みのカートリッジは焼却でき，産業
廃棄物の発生もなかった。さらに，処理層による養液中
の有効成分の吸着も少なく，肥料の補充も微調整で十分
であった。
【００２４】比較例１
比表面積965m2/g,細孔容積0.54 ml/g ，細孔分布から求
めた30Å以下の細孔の占める容積の割合が全細孔容積の
78％であるやしがら粒状活性炭 100ｇを50mm×150mmの
塔に詰めて処理層を形成した以外は実施例１と同様にし
てミツバを水耕栽培した。
【００２５】30日間にわたる水耕栽培の結果，新液に対
する連作液のミツバの生育重量比は83％と実施例１より
少なかった。また，圧力損失の上昇は認められなかった
が，粒状活性炭の漏洩による黒粉が生じた。この黒粉を
防止するために濾過フィルターを設けると，長期間の運
転で微生物の繁殖による詰まりが生じ，大きな圧力損失
が発生した。さらに，通液の初期にミツバの成育に有効
な成分の減少が起こり，それを補充する必要があった。
【００２６】比較例２
繊維状活性炭を主成分とする処理層を使用しない以外は
実施例１と同様にしてミツバの水耕栽培を行った。その
結果，新液に対する連作液のミツバの生育重量比は60％
と実施例１は勿論のこと, 比較例１より大幅に少なかっ
た。
【００２７】
【発明の効果】本発明によれば，繊維状活性炭を主成分
とする処理層で植物等が分泌する生育阻害物質を有効に
除去できるので，連作においても生育の低下がなく，養
液を長期間にわたり連続して使用することが可能とな
り，しかも，処理層は粒状活性炭のような使用上の問題
がない。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of treating nutrient solution in hydroponic cultivation of plants such as vegetables, fruits, flowers, and the like. The present invention relates to a method for treating a nutrient solution that enables a long-term circulation of a nutrient solution used in cultivation. [0002] In general, plants are cultivated using soil as a medium, such as fields and fields, and moisture and nutrients are absorbed from the roots through the soil. However, since water and nutrients are supplied by spraying water and nutrients on the soil, there is a problem that the efficiency of absorption by plants is low, and the loss of water and nutrients is large. On the other hand, hydroponic cultivation of plants such as vegetables, fruits, and flowers has been actively used in recent years. Hydroponic cultivation uses rock wool instead of soil, plastic foam,
A method is used in which fibrous substances and the like are used as a medium, and nutrients necessary for plants, such as nitrogen, phosphoric acid, and potassium, are dissolved in water to adjust the concentration of a predetermined component, and then supplied to the medium by a pump.
For this reason, hydroponic cultivation can be labor-saving and mechanized, that is, there is no need for labor such as hoeing and plowing, and there is no need for weeding, etc., and there is no need to change soil and change places to eliminate continuous cropping obstacles. The fertilizer is dissolved and circulated in the water, so there is no waste such as fertilizer run-off and the required nutrients can be given as efficiently as necessary. It is hardly influenced by weather conditions, and the cultivation density is high. It is possible to
It has advantages such as effective use of land and increase in yield per unit area. [0004] Hydroponics takes advantage of the above advantages,
In recent years, the cultivation area has rapidly increased, and mass production of vegetables and the like has also been progressing through industrialization. However, as hydroponic cultivation is applied to various plants, if the plant is operated only by topdressing without replacing the nutrient solution for a long time, the growth of some plants may be significantly delayed, resulting in poor growth. ing. At present, measures such as replacing the nutrient solution with new ones are taken empirically before such a problem occurs, but such measures have a problem that cultivation costs increase. In addition, when exchanging nutrient solution, if nutrient-rich water is discharged directly into rivers, eutrophication of rivers and lakes will be incurred, so it is necessary to treat and discharge nutrient solution. [0005] It is considered that the cause of poor plant growth in hydroponic cultivation is due to accumulation of growth inhibitory substances such as phenolic substances and organic acid substances secreted from the cultivated plants in nutrient solution. Attempts have been made to improve the growth of plants by treating the nutrient solution used with granular activated carbon. However, when a large amount of granular activated carbon is used, the resistance of the liquid is so large that it is difficult to pass the liquid. The granular activated carbon powder leaks into the liquid. Rises, making it difficult for liquid to pass through. The granular activated carbon after treatment has a risk of dust explosion and cannot be incinerated, and becomes an industrial waste, which increases the treatment cost. In addition, granular activated carbon has a wide pore distribution. In addition, since many large pores are distributed, useful nutrients are adsorbed to the plant, and not only the amount of nutrients supplied to the nutrient solution increases, but also the adsorption capacity of the target growth inhibitor decreases. Yes, there were problems. SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems, and does not cause plant growth failure even when a nutrient solution in hydroponics is circulated for a long period of time. An object of the present invention is to provide a method for treating nutrient solution in hydroponic cultivation, which has no problems in use such as granular activated carbon. Means for Solving the Problems The inventors of the present invention have conducted intensive studies to solve the above problems, and as a result, activated carbon fibrous has a property of selectively adsorbing a plant growth inhibitory substance well. If the nutrient solution is filtered through a treatment layer mainly composed of fibrous activated carbon, the replacement life of the nutrient solution can be significantly extended,
The present inventors have found that the growth of the plant has been improved and that there is no problem in use such as granular activated carbon. That is, the present invention provides a nutrient solution used for hydroponic cultivation of plants with a specific surface area of 500 to 2000 m 2 / g,
The ratio of the volume occupied by pores with a pore diameter of 30 mm or less
Fibrous activated carbon that accounts for more than 90 % of the volume
L fiber, low melting point polyester sheath component , high melting point polyester
Composite fiber, polyolefin fiber,
Polyethylene sheath component and polypropylene core component
Composite fiber, glass fiber, ceramics fiber, natural fiber
A method for treating a nutrient solution in hydroponic cultivation, characterized by circulating through a treatment layer comprising at least one fiber selected from the group consisting of: Hereinafter, the present invention will be described in detail. In the present invention, the main component of the treatment layer through which the nutrient solution used in hydroponics is passed is fibrous activated carbon.
The raw material of the fibrous activated carbon is not particularly limited, and may be any material obtained from coal pitch, petroleum pitch, rayon, phenol fiber, acrylic fiber, or the like. The specific surface area of the fibrous activated carbon is preferably 500 to 2000 m 2 / g as measured by the BET method. When the specific surface area is less than 500 m 2 / g, pores are reduced and the amount of growth inhibitor adsorbed tends to decrease. On the other hand, when the specific surface area exceeds 2000 m 2 / g, the pores become large and it becomes easy to adsorb nutrients useful for plants. Further, in the fibrous activated carbon, the proportion of the volume occupied by pores having a pore diameter of 30 mm or less in the pore distribution determined by the B, J, H method (the method of Barrett, Joyner, Halenda et al.) It is preferably at least 90% of the pore volume.
When the pore volume is less than 90%, the number of large pores that adsorb useful nutrients to the plant increases, and for example, 20 to 30 pores with a diameter of 30 mm or more such as commonly used granular or powdered activated carbon.
When it is present in an amount of 35%, the selective adsorption of the growth-inhibiting substance decreases, and even useful nutrients are adsorbed, and the required amount of nutrients to be supplied to the nutrient solution tends to increase. The treatment layer used in the present invention may be formed of a raw cotton or sheet of fibrous activated carbon and packed in a tank, a laminate of sheets containing fibrous activated carbon as a main component, or a concentric cylinder. Rolled into a cartridge to form a cartridge, fibrous activated carbon and a binder dispersed in water, molded into a cylindrical or cylindrical cartridge by introducing into a mold, and the sheet is molded into a corrugated or honeycomb shape Can be used. Among them, a cartridge formed by winding a sheet mainly composed of fibrous activated carbon has less clogging and is excellent in handling. When this cartridge is used as a treatment layer, it is preferable that the cartridge is attached to the housing and the nutrient solution is passed from the outer layer to the inner layer of the cartridge. As a method for manufacturing the cartridge, it is preferable to mix the fibrous activated carbon and other materials by a dry method or a wet papermaking method, form a sheet, and wind the sheet in a concentric cylindrical shape. Other materials used with fibrous activated carbon include low melting point polyester fiber, low melting point polyester as a sheath component, high melting point polyester as a core component, composite fiber, polyolefin fiber, and polyethylene as a sheath component.
Examples include binder fibers such as composite fibers having polypropylene as a core component, inorganic fibers such as glass fibers and ceramic fibers, and natural fibers. One or more of these are blended with the fibrous activated carbon, but the blending ratio is 40 to
90% by weight and 60 to 10% by weight of other materials are preferred. When the amount of the fibrous activated carbon is less than 40% by weight, the effect of adsorbing the growth inhibitor tends to decrease. Also, the amount of fibrous activated carbon is 90% by weight.
If it exceeds, it becomes difficult to form a cartridge. If the nutrient solution of hydroponic cultivation is used for a long period of time in a treatment layer containing fibrous activated carbon as a main component while filtering, the nutrient solution has a high nutrient content, so that microorganisms can propagate in the treatment layer and cause clogging. Problem may occur. In order to prevent such a problem from occurring, a treatment layer may be formed with fibrous activated carbon impregnated and / or containing a hardly water-soluble silver compound in an amount of 0.01 to 10% by weight, or a binder fiber containing an antibacterial silver compound may be used. If a processing layer such as a cartridge is formed by using the method, it is possible to prevent the growth of microorganisms in the processing layer. Here, as the poorly water-soluble silver compound, silver chloride and silver oxide are preferable because they can be easily obtained. As the antibacterial silver compound, silver oxide and silver-adsorbed zeolite are preferably used. As a means for impregnating or containing these silver compounds in the fibrous activated carbon or the treated layer, known methods can be adopted. In general, in hydroponic cultivation, a nutrient solution is sent from a nutrient solution tank for preparing a nutrient solution to each medium in a hydroponic culture bed by a pump. The nutrient solution after being supplied to the plant is collected in a drain pipe and returned to the nutrient solution tank. After adjusting the nutrient content, it is again sent to each medium, and the nutrient solution is circulated and used. In the above, according to the present invention, a tank provided with a treatment layer mainly composed of fibrous active is provided in the middle of a drainage pipe, or a nutrient solution is supplied between a nutrient solution tank and a tank provided with a treatment layer. A system separate from the nutrient solution circulation system is provided so that the nutrient solution can be circulated. The nutrient solution is passed through the treatment layer to adsorb the plant growth inhibitor, and then the nutrient solution from which the growth inhibitor has been removed is sent to the nutrient solution tank. Then, the solution is sent to the culture medium. Next, the present invention will be described in detail with reference to examples. Example 1 A specific surface area of 1650 m 2 / g, a pore volume of 0.84 ml / g, and a ratio of a volume occupied by pores having a pore diameter of 30 ° or less determined by pore distribution is 95% of the total pore volume. Coal pitch-based fibrous activated carbon 60% by weight
40% by weight of a composite binder fiber (Melty <4080> manufactured by Unitika Ltd.) with a sheath component of low melting polyester and a core component of high melting polyester mixed by card processing to produce a sheet with a basis weight of 40 g / m 2 did. This sheet is concentrically wound around a cylindrical iron pipe having an outer diameter of 30 mm to form a cylindrical cartridge having an outer diameter of 65 mm. After heat treatment, the cartridge is cut every 250 mm and cut into an inner diameter of 30 mm, an outer diameter of 65 mm, and a length of 250 mm. 250mm, 55g fibrous activated carbon
The resulting cylindrical cartridge was obtained. Using the obtained cylindrical cartridge as a treatment layer, it was attached to a circulation system of 500 liters of nutrient solution for hydroponic cultivation of honeybee, and was passed at a flow rate of 6 liters / min. Here, the honeybee used was Kansai white-stalked honeybee. The nutrient solution was Otsuka House Fertilizer No. 1 and No. 2 (trade name), a new solution adjusted to the concentration of the garden test formulation, and a continuous crop of three honeybees without using activated carbon. The test was performed for a solution using a liquid. As a result of the hydroponic cultivation for 30 days, the growth of the honeybee was good in all cases, and the growth weight ratio of the honeybee in the continuous cultivation liquor to the new liquor was 98%. The operating conditions of both liquids were good with no pressure increase and no generation of coal dust. In addition, the treated cartridges could be incinerated without any industrial waste. Furthermore, the adsorption of the active ingredient in the nutrient solution by the treated layer was small, and the fine adjustment of fertilizer replenishment was sufficient. Comparative Example 1 The specific surface area was 965 m 2 / g, the pore volume was 0.54 ml / g, and the ratio of the volume occupied by pores of 30 ° or less determined from the pore distribution was less than the total pore volume.
Honey cultivation was hydroponically cultivated in the same manner as in Example 1 except that 100 g of coconut granular activated carbon (78%) was packed in a 50 mm × 150 mm tower to form a treated layer. As a result of the hydroponic cultivation for 30 days, the growing weight ratio of the honeywort of the continuous cropping liquid to the new liquid was 83%, which was smaller than that of Example 1. No increase in pressure loss was observed, but black powder was generated due to leakage of granular activated carbon. If a filtration filter is provided to prevent this black powder, clogging due to the propagation of microorganisms occurs over a long period of operation, causing a large pressure loss. Furthermore, at the beginning of the passage, the components effective for growing honeybees decreased, and it was necessary to supplement them. Comparative Example 2 Honey beet was cultivated in hydroponics in the same manner as in Example 1 except that the treated layer containing fibrous activated carbon as a main component was not used. As a result, the growth weight ratio of the honey bean in the continuous cropping liquid to the new liquid was 60%
And Example 1 as well as much less than Comparative Example 1. According to the present invention, a growth inhibitory substance secreted by a plant or the like can be effectively removed by a treatment layer containing fibrous activated carbon as a main component. The liquid can be used continuously for a long period of time, and the treated layer does not have a problem in use such as granular activated carbon.
Claims (1)
液を，比表面積が 500 〜 2000m 2 /g, 細孔直径 30 Å以下の
細孔の占める容積の割合が，全細孔容積の 90 ％以上であ
る繊維状活性炭と、低融点ポリエスエル繊維，低融点ポ
リエステルを鞘成分 , 高融点ポリエステルを芯成分とす
る複合繊維，ポリオレフィン繊維，ポリエチレンを鞘成
分 , ポリプロピレンを芯成分とする複合繊維，ガラス繊
維、セラッミクス繊維，天然繊維からなる群から選ばれ
た少なくとも１種の繊維からなる処理層を通して循環さ
せることを特徴とする水耕栽培における養液の処理方
法。(57) [Claims] [Claim 1] A nutrient solution used in hydroponic cultivation of a plant is prepared with a specific surface area of 500 to 2000 m 2 / g and a pore diameter of 30 mm or less.
The ratio of the volume occupied by the pores is 90 % or more of the total pore volume.
And fibrous activated carbon that, low melting point Poriesueru fibers, low melting point Po
Riester as sheath and high-melting polyester as core
Composite fiber, polyolefin fiber and polyethylene
Min, composite fibers of polypropylene as the core component, glass fiber
Selected from the group consisting of fiber, ceramics fiber and natural fiber
A method for treating a nutrient solution in hydroponics, wherein the solution is circulated through a treatment layer comprising at least one fiber .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP07755095A JP3532654B2 (en) | 1995-04-03 | 1995-04-03 | Treatment method of nutrient solution in hydroponics |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP07755095A JP3532654B2 (en) | 1995-04-03 | 1995-04-03 | Treatment method of nutrient solution in hydroponics |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH08266171A JPH08266171A (en) | 1996-10-15 |
| JP3532654B2 true JP3532654B2 (en) | 2004-05-31 |
Family
ID=13637131
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP07755095A Expired - Fee Related JP3532654B2 (en) | 1995-04-03 | 1995-04-03 | Treatment method of nutrient solution in hydroponics |
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| Country | Link |
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| JP (1) | JP3532654B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1997035466A1 (en) * | 1996-03-26 | 1997-10-02 | Mitsubishi Chemical Corporation | Sterilizer for circulation nutricultivating apparatus, nutrient solution sterilizing method using the same, and circulation nutricultivating apparatus |
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1995
- 1995-04-03 JP JP07755095A patent/JP3532654B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH08266171A (en) | 1996-10-15 |
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