JP2005103362A

JP2005103362A - Fibrous filter medium for treating water

Info

Publication number: JP2005103362A
Application number: JP2003337149A
Authority: JP
Inventors: Kunio Fujita; 邦夫藤田; Yasutaka Suetsugu; 康隆末次; Yukinori Iguchi; 幸徳井口; Osamu Takuma; 治詫間; Osamu Yamashita; 修山下
Original assignee: Ishigaki Co Ltd
Current assignee: Ishigaki Co Ltd
Priority date: 2003-09-29
Filing date: 2003-09-29
Publication date: 2005-04-21
Anticipated expiration: 2023-09-29
Also published as: JP3994392B2

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fibrous filter medium for treating water which is made from such a chenille filter medium that the adhesive strength between a stuffer thread and a pile thread of chenille yarn is increased and the pile thread of which is prevented from falling. <P>SOLUTION: The chenille yarn (5) is formed by twining the stuffer thread (1) with a retaining thread (2) coated with a low-melting point fusing agent (3) while winding the pile thread (4) and cutting the surfacing pile thread (4) short. The chenille filter medium (7) is manufactured by heat-treating the chenille yarn (5) to melt the fusing agent (3), cutting the heat-treated chenille yarn by the predetermined length and heating the cut surface of each of the stuffer thread (1) and the retaining thread (2) to melt the remaining fusing agent (3) instantaneously. The manufactured chenille filter medium has so excellent compressibility that the porosity between the adjacent chenille filter media can be made small when a filtration layer is formed. Since the pile thread (4) hardly falls from the cut surface-fixed chenille filter medium, the water washing efficiency and durability of the chenille filter medium can be enhanced. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

この発明は、生活廃水や工場排水等の汚水中に含まれる懸濁物質を分離する水処理用繊維ろ材に関し、特に、モール糸を応用したモールろ材の改良に関する。 The present invention relates to a fiber filter medium for water treatment that separates suspended substances contained in sewage such as domestic wastewater and factory effluent, and more particularly to improvement of a Moll filter medium using Mole yarn.

従来、空隙性のある繊維ろ材が、固液分離や生物処理装置に多く使用されている。ろ過装置に用いる繊維性塊状ろ材のろ過メカニズムは、ろ材単体に空隙を有するものであっても、被処理水中の溶媒、および懸濁物質が通過する流路はろ材の間が優先的となる。この現象は、特に懸濁物質において顕著であり、懸濁物質粒子径がろ過性能の律束要因となる。この要因によりろ材に要求される機能は、いかにろ材間の空隙（径）を減らすかであり、空隙の程度により処理水質が左右される。繊維ろ材は、微生物等の保持体としてのろ材（バイオフィルム等による溶解性物質の除去）以外は、単純固液分離用のろ過ろ材であっても、ろ材単体に空隙を有するものが主流である。 Conventionally, a porous fiber filter medium has been widely used in solid-liquid separation and biological treatment apparatuses. Even if the filtration mechanism of the fibrous massive filter medium used in the filtration apparatus has a gap in the filter medium alone, the flow path through which the solvent and suspended substances in the water to be treated passes is preferential. This phenomenon is particularly noticeable in suspended solids, and the suspended solid particle size becomes a limiting factor for filtration performance. The function required of the filter medium due to this factor is how to reduce the gap (diameter) between the filter media, and the quality of the treated water depends on the degree of the gap. As for fiber filter media, except for filter media as a support for microorganisms (removal of soluble substances by biofilms, etc.), filter media for simple solid-liquid separation are mainly those having voids in the filter media alone. .

従来のろ過装置に塊状の繊維ろ材を充填してろ材層を形成して固液分離を行なう装置は、例えば、特許文献１に記載してあるように、公知である。そして、このろ過装置に使用する繊維ろ材は、特許文献２に示すように、ろ材本体に毛状体をなす繊維を植え付けた繊維ろ材を用いている場合があるが、特許文献３に示すように、マリモのようなパーマネント繊維の植毛が主流である。これらの繊維ろ材は粒状ろ材と比較して格段に多くの空隙率を有し、繊維ろ材は絡みあったフィラメントによりろ材層が形成されるので、微生物の着棲体としての利点がある。 A device for performing solid-liquid separation by filling a conventional filter device with a block of fiber filter material to form a filter material layer is known, for example, as described in Patent Document 1. And the fiber filter medium used for this filtration apparatus may use the fiber filter medium which planted the fiber which makes a hair-like body in a filter medium main body, as shown in patent documents 2, but as shown in patent documents 3 Permanent fiber implantation like marimo is the mainstream. These fiber filter media have a remarkably large porosity compared to the granular filter media, and the fiber filter media have an advantage as a microbial adhering body because a filter media layer is formed by entangled filaments.

特開平６-７９１０８号公報（明細書の段落番号０００６及び段落番号０００８、第１図）JP-A-6-79108 (paragraph number 0006 and paragraph number 0008 of the specification, FIG. 1) 特開平１−１０４３１６号公報（明細書の第２頁左上段第１２行目乃至右上段第４行目，第１図乃至第３図）Japanese Laid-Open Patent Publication No. 1-104316 (second page, upper left row, 12th row to upper right row, 4th row, FIGS. 1 to 3) 特許第２６７２７８０号公報（明細書の段落番号０００８、第１図）Japanese Patent No. 2672780 (paragraph number 0008 of the specification, FIG. 1)

上記従来の繊維ろ材は、ろ過の清澄性を補う為に、ろ材単体自体の空隙の緻密さに注力して、ろ材間の空隙を減じる形態となっていない。ろ材ろ過における除濁効率は、ろ層圧縮率とろ層高さに大きく律束される。現在実用化されている繊維ろ材は、ろ材単体自体に空隙を有するため、粒径の小さな粒子が繊維ろ材内部に侵入する。侵入した微粒子はろ材内部に経時的に蓄積されて比重が大きくなり、本来のろ材性状（特性）が変化して、ろ過機能として不具合を生じる。この現象はろ材内の空隙がたとえ連続的であっても非常に洗浄性が悪く、一旦侵入した粒子はろ材単体内部に保持される。この状況を改善する為に、より強力な力で洗浄を行うと、ろ材自体に何らかの障害が生じ、本来のろ過機能を消失する。また、植毛繊維は同一保持体の繊維間で粒子を保持する可能性が高く、この現象によるろ材の分散・展開への阻害が生じる。パーマネントろ材は、形状の変化が容易であるが、開放時においても圧密時の形状を維持する場合が多く、次期ろ過時に不均一なろ材間空隙を形成してしまう。 The conventional fiber filter media is not in a form that reduces the voids between the filter media by focusing on the fineness of the voids of the filter media itself in order to supplement the clarification of filtration. The turbidity efficiency in filter medium filtration is largely bound by the filter bed compressibility and filter bed height. Since the fiber filter medium currently in practical use has voids in the filter medium itself, particles having a small particle size enter the fiber filter medium. The infiltrated fine particles are accumulated in the filter medium with time, and the specific gravity increases, and the original filter medium properties (characteristics) change to cause a problem as a filtering function. This phenomenon is very poor in cleanability even if the voids in the filter medium are continuous, and once invaded particles are held inside the filter medium alone. In order to improve this situation, when washing is performed with a stronger force, some trouble occurs in the filter medium itself, and the original filtration function is lost. In addition, the flocked fiber has a high possibility of holding particles between fibers of the same holding body, and this phenomenon hinders the dispersion and development of the filter medium. Permanent filter media are easy to change in shape, but often maintain the compacted shape even when opened, and form non-uniform gaps between the filter media during the next filtration.

従来の繊維ろ材の欠点を解消するために、衣料関係で広く使用されているモール糸を利用して、本願発明の出願人が特願２００３−１６５８２８号公報において、樹脂繊維の芯糸に接着糸を混入して接着糸を融着固着させ、このモール糸を切断してモールろ材とした水処理用ろ材を提案している。芯糸に接着糸を混入して融着固化させる従来の芯糸と花糸の接着方法では、モール糸が衣料用品向けの商品であることも手伝って、それ程接着強度を必要とせず、花糸の融着面にバラツキがあった。モール糸をろ材として使用する場合、ろ材加工時のカットが原因で、その接着強度が非常に弱く、洗浄工程を繰り返すたびに芯糸の撚りが解かれ、これにより芯糸で固定されていた花糸が容易に脱落する。この脱落現象はモールろ材の両端で顕著であり、モールカット時の切断面を基点に撚りの緩みが発生する。特に洗浄時に顕著な花糸の脱落は、その現象を防止するために洗浄強度が低い洗浄方法を選択しなければならず、その結果、洗浄水量及び洗浄時間の増大を招く恐れがある。本願発明は、芯糸と花糸の接着方法を改善してモール糸の接着強度を増大させ、特に、ろ材切断面の接着強度を大きくして、花糸の脱落を防止するモールろ材を用いた水処理用繊維ろ材を提供する。 In order to eliminate the shortcomings of conventional fiber filter media, the applicant of the present invention disclosed in Japanese Patent Application No. 2003-165828 using a molding thread that is widely used in clothing. A water treatment filter medium is proposed, in which adhesive thread is fused and fixed, and the molding thread is cut to form a molding filter medium. The conventional core yarn and flower yarn bonding method, in which the adhesive yarn is mixed into the core yarn and fused and solidified, helps the moor yarn to be a product for clothing, and does not require much adhesive strength. There was variation in the fused surface. When moor yarn is used as a filter medium, the adhesive strength is very weak due to the cutting during the filtering process, and the core thread is untwisted each time the washing process is repeated, so that the flower fixed with the core thread The thread falls off easily. This drop-out phenomenon is remarkable at both ends of the molding filter medium, and twist looseness occurs with the cut surface at the molding cut as a base point. In particular, in order to prevent the phenomenon of flower yarns coming off at the time of washing, a washing method having a low washing strength must be selected, and as a result, there is a risk of increasing the amount of washing water and washing time. The present invention uses a molding filter medium that improves the bonding method between the core yarn and the flower yarn to increase the bonding strength of the molding yarn, and in particular, increases the bonding strength of the cut surface of the filter medium to prevent the dropping of the flower yarn. Provide fiber filter media for water treatment.

上記の課題を解決するために、樹脂繊維からなる芯糸と押え糸の両方またはどちらか一方に低融点の融着剤をコーティングして、その芯糸と押え糸を撚り合せながら花糸を巻き付け、同時に花糸を短くカットしてモール糸を形成すると共に、モール糸を加熱処理して、融着剤を溶融させた後、所定の長さに切断してモールろ材とするもので、芯糸に混入した従来の接着糸に比較して、コーティングした融着剤は花糸を均一に融着させることができる。芯糸と押え糸、および短繊維の花糸から構成されたモールろ材は、非常に圧縮性に富み、小さな力で容易に圧縮が可能である。ろ材間空隙の充填は、単位ろ材相互の短繊維挿入により可能となり、ろ層形成時のろ材間空隙率が減少する。このろ材間空隙を優先的に通過する被処理水中の懸濁物質は、ろ材間充填短繊維によって捕捉、除去することができる。そして、モール糸のカット時に、モールろ材の芯糸と押え糸の切断面を加熱して、残留融着剤を溶融させれば、ほつれの発生起点である切断面にほつれ止めを形成することができる。切断面を固定したモールろ材は、花糸の脱落が少なくなり、ろ材の耐久性が高くなる。そして、モールろ材の洗浄強度が高められ、洗浄水量と洗浄時間が減少し、洗浄効率が高くなる。 In order to solve the above-mentioned problems, a low-melting-point fusion agent is coated on the core yarn and presser yarn made of resin fiber, and the yarn is wound while twisting the core yarn and the presser yarn. At the same time, the flower yarn is cut short to form a molding yarn, the molding yarn is heat-treated to melt the fusing agent, and then cut into a predetermined length to form a molding filter medium. Compared with the conventional adhesive yarn mixed in, the coated fusing agent can fuse the flower yarn uniformly. A molding filter medium composed of a core thread, a presser thread, and a short fiber is very compressible and can be easily compressed with a small force. Filling the gaps between the filter media is possible by inserting short fibers between the unit filter media, and the porosity between the filter media during the formation of the filter layer is reduced. Suspended substances in the water to be treated that preferentially pass through the gaps between the filter media can be captured and removed by the short fibers filled between the filter media. And when cutting the molding yarn, if the core thread of the molding filter medium and the cut surface of the presser yarn are heated to melt the residual fusing agent, a fraying stopper can be formed on the cutting surface where the fraying starts. it can. Mole filter media with a fixed cut surface reduce the dropout of flower yarns and increase the durability of the filter media. And the washing | cleaning intensity | strength of a mole filter medium is raised, the amount of washing water and washing | cleaning time reduce, and washing | cleaning efficiency becomes high.

モールろ材は、樹脂繊維からなる芯糸と押え糸の両方またはどちらか一方に低融点の融着剤をコーティングして、その芯糸と押え糸を撚り合せながら花糸を巻き付け、巻き付けた花糸を短くカットしてモール糸を形成し、融着剤を軟化点付近まで加熱して花糸を一旦仮止めさせると共に、モール糸を所定の長さに切断してモールろ材を形成し、次にモールろ材を加熱して、融着剤を溶融させ、芯糸と押え糸に挟み込んだ花糸を固着させてもよいもので、切断面にほつれ止めを形成し、芯糸と押え糸に挟み込んだ花糸を連続してバラツキなく固着させることができる。 Mole filter media is made by coating the core yarn made of resin fibers and / or the presser yarn with a low-melting-point fusion agent, and winding the yarn while twisting the core yarn and the presser yarn. Cut a short length to form a molding thread, heat the fusing agent to near the softening point to temporarily fix the flower thread, cut the molding thread to a predetermined length to form a molding filter medium, The filter medium may be heated to melt the fusing agent, and the flower thread sandwiched between the core thread and the presser thread may be fixed, forming a fray stop on the cut surface, and sandwiched between the core thread and the presser thread. The flower yarn can be fixed continuously without variation.

花糸の押え糸は芯糸より小径として、１本の芯糸と複数本の押え糸を撚り合せながら花糸を巻き付けてもよく、花糸と融着剤の接触面が増加して、融着の均一性と浸透性が増加する。そして、繊維ろ材の材質が、芯糸と押え糸にポリエステル、ナイロン等の樹脂繊維と、花糸に加工糸または生糸を用いると共に、融着剤を低融点、高溶融粘度のポリエチレンで構成したもので、懸濁物質の捕捉部位が、若干ウエーブがかかったフィラメント状の加工糸、あるいは、フィラメント状の硬く直毛の生糸からなる短繊維の花糸であり、ろ材の洗浄が容易となる。低融点、高溶融粘度のポリエチレンを融着剤としたので、短繊維の花糸が固定され、ろ過および洗浄によるモールろ材の劣化（植毛繊維の脱落）が解消されて、長期間、安定したろ過機能を有するろ材となる。 The presser thread of the flower thread may be smaller in diameter than the core thread, and the yarn may be wound while twisting one core thread and a plurality of presser threads. The uniformity and permeability of the dressing is increased. The material of the fiber filter medium is made of resin fibers such as polyester and nylon for the core yarn and presser yarn, and processed yarn or raw yarn for the flower yarn, and the fusion agent is made of polyethylene having a low melting point and a high melt viscosity. Thus, the trapped portion of the suspended substance is a filament-like processed yarn that is slightly waved, or a short-fiber flower yarn made of filament-like hard straight raw silk, which facilitates washing of the filter medium. Low melting point and high melt viscosity polyethylene is used as a fusing agent, so the short fiber yarns are fixed, and the deterioration of the Mole filter medium (dropping of flocked fibers) due to filtration and washing is eliminated. The filter medium has a function.

この発明に係る水処理用モールろ材は上記のように構成してあり、モールろ材は、芯糸や押え糸にコーティングした融着剤が、花糸を均一に融着させることができ、若干ウエーブがかかった加工糸や直毛の生糸からなる短繊維の花糸の先端が広がり、非常に圧縮性に富み、小さな力で容易に圧縮が可能となる。ろ過槽に充填したモールろ材は、芯糸に放射状に固定したモール糸の花糸が、ろ層内のろ材間空隙を効率良く、平均的に充填してろ材間の空隙を減少させる。圧縮時のろ材間は、短繊維で密に充填され、被処理水の通水距離とろ材との接触頻度を増大させ、より小さな粒子径の懸濁物質を捕捉除去することができる。また、ろ材ろ過における除濁効率は、ろ層圧縮率とろ層高さに大きく律束されるので、従来の小片繊維塊ろ材では不可能であったろ層高さの低減が、モールろ材によるろ材間空隙充填で可能となる。ろ過装置に形成するろ材層のモールろ材は、懸濁物質の捕捉部位が、先端が広がった短繊維の花糸であり、分散・展開が容易で、植毛繊維間の捕捉粒子を極めて小さなエネルギーで剥離・脱落させることが可能となる。モールろ材に固定されている短繊維の花糸は、洗浄動力の低減により、植毛繊維の花糸の脱落が解消されて、長期間、安定したろ過機能を有するろ材となる。 The water treatment molding filter medium according to the present invention is configured as described above, and the molding filter medium has a fusing agent coated on the core yarn and presser yarn that can uniformly fuse the flower yarn, and has a slight wave The tip of the staple yarn made of processed yarn or straight raw yarn spreads out, and is very compressible and can be easily compressed with a small force. In the molding filter medium filled in the filtration tank, the thread of the molding thread radially fixed to the core thread efficiently fills the gaps between the filter mediums in the filter layer on an average to reduce the gaps between the filter media. The space between the filter media at the time of compression is densely filled with short fibers, and the frequency of contact between the water to be treated and the filter media is increased, so that suspended substances having a smaller particle diameter can be captured and removed. In addition, the turbidity efficiency in filter media filtration is largely governed by the filter bed compressibility and filter bed height, so it is possible to reduce the filter bed height, which was impossible with conventional small fiber lump filter media. It becomes possible by filling the gap. The filter medium layer of the filter medium formed on the filter device is a short fiber thread with a wide tip at the trapping site for suspended solids, which is easy to disperse and deploy, and traps particles between flocked fibers with very little energy. It can be peeled off and dropped off. The short fiber yarn fixed to the molding filter medium eliminates the fallen yarn of the flocked fiber due to a reduction in washing power, and becomes a filter medium having a stable filtration function for a long period of time.

以上のように、花糸の融着強度は、モールろ材の耐久性の向上をもたらし、花糸の脱落が少ないため、初期充填繊維量の減少がない。洗浄効率が高く、ろ材の耐久性も高いことから、非常に安定したろ過運転が長期にわたり可能となる。さらに、モールろ材の劣化がなく、初期投入ろ材量を維持できるため、ろ材の取替え等のメンテナンスが軽減されて、廃棄物として処理すべき廃ろ材の発生が少なくなる。 As described above, the fusing strength of the flower yarn brings about an improvement in the durability of the molding filter medium, and since there is little loss of the flower yarn, there is no decrease in the amount of initial filling fibers. Since the washing efficiency is high and the durability of the filter medium is also high, a very stable filtration operation is possible over a long period of time. Furthermore, since there is no deterioration of the mole filter medium and the initial amount of filter medium can be maintained, maintenance such as replacement of the filter medium is reduced, and generation of waste filter medium to be processed as waste is reduced.

図１はモール糸の製造工程の概念図であって、芯糸１と押え糸２はポリエステル、ナイロン等の樹脂繊維を使用しており、図２に示すように、押え糸２の表面に融着剤３をコーティングしてある。特に、コーティングする融着剤３としては、低融点で高溶融粘度のあるポリエチレンが好ましい。この芯糸１と押え糸２を撚り合せながら、もう１本の加工糸または生糸の花糸４を巻き付けて、表面に出ている花糸４を短くカットしてモール糸５を形成する。カットされた花糸４は先端部が放射状に広がり、非常に圧縮性に富み、小さな力で容易に圧縮が可能となる。次に、モール糸５をヒーター６で加熱処理して、融着剤３のポリエチレンを溶融させる。芯糸１と押え糸２に挟み込む花糸４の束を、溶融した融着剤３で漏れなく固定するので、接着強度が増大して花糸の融着に対するムラが解消できる。 FIG. 1 is a conceptual diagram of a process for producing a molding yarn. The core yarn 1 and the presser yarn 2 use resin fibers such as polyester and nylon. As shown in FIG. Adhesive 3 is coated. In particular, the fusion agent 3 to be coated is preferably a polyethylene having a low melting point and a high melt viscosity. While this core yarn 1 and presser yarn 2 are twisted, another processed yarn or raw yarn 4 is wound, and the yarn 4 on the surface is cut short to form a molding yarn 5. The cut yarn 4 has a radially extending tip, is very compressible, and can be easily compressed with a small force. Next, the molding yarn 5 is heated with the heater 6 to melt the polyethylene of the fusing agent 3. Since the bundle of flower yarns 4 sandwiched between the core yarn 1 and the presser yarn 2 is fixed without omission by the melted fusion agent 3, the adhesive strength is increased and unevenness of the flower yarn can be eliminated.

図３及び図４はモールろ材であって、押え糸２にコーティングした融着剤３を溶融させた後、モール糸５を所定の長さ（５ｍｍ程度）に切断してモールろ材７を作る。モール糸５のカット時にモールろ材７の芯糸１と押え糸２の切断面を加熱して、残留している融着剤３を瞬間的に溶融させる。その後、常温で冷却することにより、ほつれの発生起点である切断面にほつれ止めが形成される。なお、押え糸２にコーティングした融着剤３は、芯糸１に行なっても良く、あるいは芯糸１と押え糸２の両方に行なっても良いものである。芯糸１と押え糸２の両方に融着剤３をコーティングすれば、更に、接着強度が増大して花糸の融着に対するムラが解消できる。図５はモール糸の製造工程の他の実施例の概念図であって、上記押え糸２を芯糸１より小径として、一本の芯糸１と複数本の押え糸２ａを撚り合せ、コーティングした融着剤３で融着させれば、融着の均一性と浸透性が増加する。この発明の芯糸１と押え糸２、および短繊維の花糸４から構成されたモールろ材７は、非常に圧縮性に富み、小さな力で容易に圧縮が可能となる。 3 and 4 show a molding filter medium. After the fusion agent 3 coated on the presser thread 2 is melted, the molding thread 5 is cut into a predetermined length (about 5 mm) to make a molding filter medium 7. When the molding yarn 5 is cut, the cut surfaces of the core yarn 1 and the presser yarn 2 of the molding filter medium 7 are heated to instantaneously melt the remaining fusion agent 3. Thereafter, by cooling at room temperature, a fraying stopper is formed on the cut surface where fraying starts. The fusion agent 3 coated on the presser thread 2 may be applied to the core thread 1 or to both the core thread 1 and the presser thread 2. If the fusing agent 3 is coated on both the core yarn 1 and the presser yarn 2, the adhesive strength is further increased and the unevenness of the fusing of the flower yarn can be eliminated. FIG. 5 is a conceptual diagram of another embodiment of the process for producing a molding yarn, in which the presser yarn 2 has a smaller diameter than the core yarn 1, and a single core yarn 1 and a plurality of presser yarns 2a are twisted together and coated. If the fusion agent 3 is used, the uniformity and permeability of the fusion increase. The molding filter medium 7 composed of the core yarn 1, the presser yarn 2 and the short yarn flower yarn 4 of the present invention is very compressible and can be easily compressed with a small force.

モール糸の他の実施例の製造工程は、上記のように、花糸４を短くカットしたモール糸５を、融着剤３の軟化点付近までヒーター６で加熱して花糸４を一旦仮止めさせ、モール糸５を所定の長さに切断してモールろ材７を形成する。次に加熱空気やヒーターでモールろ材７を加熱して、融着剤３の融点付近まで昇温させて、芯糸１と押え糸２に挟み込んだ花糸４を溶融した融着剤３で固着させてもよいものである。モールろ材７の両断面付近の仮止めされていた融着剤３が溶融し、芯糸１と押え糸２の切断面を再度固着する。これにより、ろ材断面から発生するほつれを防止することが可能となる。なお、モールろ材７を加熱しても、隣接するモールろ材７、７が花糸４・・・を介して接触していることから、隣接するモールろ材７、７の花糸が融着剤３により互いに溶着することはないものである。 As described above, the manufacturing process of the other embodiment of the molding yarn is as follows. The molding yarn 5 obtained by cutting the flower yarn 4 shortly is heated by the heater 6 to the vicinity of the softening point of the fusing agent 3 to temporarily remove the flower yarn 4. The molding thread 5 is cut to a predetermined length to form the molding filter medium 7. Next, the molding material 7 is heated with heated air or a heater to raise the temperature to near the melting point of the fusing agent 3, and the flower yarn 4 sandwiched between the core yarn 1 and the presser yarn 2 is fixed with the fusing agent 3. It may be allowed to. The temporarily fixed fusion agent 3 in the vicinity of both cross sections of the molding filter medium 7 is melted, and the cut surfaces of the core yarn 1 and the presser yarn 2 are fixed again. As a result, fraying that occurs from the cross-section of the filter medium can be prevented. Even if the molding filter medium 7 is heated, the adjacent molding filter medium 7, 7 is in contact with the flower thread 4. Are not welded to each other.

図６は密閉ろ過装置であって、ろ過槽８の槽底に被処理液供給管９と、その頂部に処理水管１０を連結した集水ノズル１１が配設してある。ろ過槽８に本願発明のモールろ材７・・・が充填してあり、被処理液を上向流で供給して、ろ過槽の上半部にろ材層１２を形成させる。ろ材層１２を形成するモールろ材７は、芯糸１と押え糸２に固定した放射状短繊維の花糸４が、ろ材層１２内のモールろ材７、７間の空隙を効率良く平均的に充填し、ろ層形成時のろ材間空隙率が減少する。そして、ろ過槽８に圧入される被処理液が、さらにろ材層１２を圧縮してモールろ材７、７間の空隙率を減少させ、モールろ材７、７間の空隙を優先的に通過する被処理水中の懸濁物質をろ材間充填短繊維の花糸４によって捕捉、除去する。ろ材層１２の下方に空気供給管１３が配設してあり、ろ材層１２が目詰まりした時に、あるいは、処理水が悪化したときに、ろ材層の下方に圧縮空気を供給すれば、モールろ材７・・・は流動して、モールろ材７、７間に捕捉した懸濁物質を分離させる。符号１４は被処理液の供給管１０から分岐した洗浄排水管、符号１５は処理水管１０から分岐させた捨水管、符号１６はエアー洗浄時のろ材流出防止用のスクリーンである。短繊維の花糸４は容易に分散・展開が可能であり、植毛繊維間の捕捉粒子は極めて小さなエネルギーで剥離・脱落させる。この洗浄の簡便性は洗浄動力を非常に低減でき、洗浄時のろ材の劣化がなく、ろ材の耐久年数が長くなる。このモールろ材７は、花糸４の脱落が非常に少ないため、ろ材の耐久性も高く、安定したろ過運転が長期にわたり可能となる。 FIG. 6 shows a hermetic filtration apparatus, in which a liquid to be treated supply pipe 9 is provided at the bottom of the filtration tank 8 and a water collection nozzle 11 having a treated water pipe 10 connected to the top thereof. The filter tank 8 is filled with the molding filter medium 7 of the present invention, and the liquid to be treated is supplied in an upward flow to form the filter medium layer 12 in the upper half of the filter tank. In the molding filter medium 7 forming the filter medium layer 12, the flower yarns 4 of the radial short fibers fixed to the core thread 1 and the presser thread 2 efficiently and uniformly fill the gaps between the molding filter medium 7 and 7 in the filter medium layer 12. And the porosity between filter media at the time of filter layer formation decreases. Then, the liquid to be treated that is press-fitted into the filtration tank 8 further compresses the filter medium layer 12 to reduce the porosity between the molding filter media 7 and 7 and preferentially passes through the gap between the molding filter media 7 and 7. Suspended substances in the treated water are captured and removed by the yarn 4 between the filter medium-filled short fibers. If the air supply pipe 13 is disposed below the filter medium layer 12 and the filter medium layer 12 is clogged or the treated water is deteriorated, if compressed air is supplied to the lower part of the filter medium layer, the Mole filter medium 7... Flows to separate suspended substances trapped between the molding filter media 7 and 7. Reference numeral 14 denotes a cleaning drain pipe branched from the supply pipe 10 for the liquid to be treated, reference numeral 15 denotes a drain pipe branched from the treated water pipe 10, and reference numeral 16 denotes a screen for preventing a filter medium from flowing out during air cleaning. The short fiber yarn 4 can be easily dispersed and spread, and the trapped particles between the flocked fibers are peeled off and dropped off with extremely small energy. This simplicity of washing can greatly reduce the washing power, there is no deterioration of the filter medium during washing, and the durability of the filter medium is prolonged. Since the Mole filter medium 7 has very few drops of the flower yarn 4, the filter medium has high durability, and a stable filtration operation can be performed over a long period of time.

図６に示す密閉ろ過装置を用いて、充填して実験を行なった。水処理用ろ材は、本願発明の押え糸にポリエチレンをコーティングしたモールろ材と、従来の芯糸に接着糸を混入したモールろ材を、ろ層圧縮率とろ層高さを同一として、ろ過装置に充填した。接着法の異なるモールろ材についてろ過性能の比較試験を行なった。試験条件として、原水濁度：２．５度（カオリン模擬液）、通水速度：６０ｍ／ｈ、充填ろ材量：一定、洗浄方法：一定、の同一条件で行なった。その結果は表１の通りであり、縦軸に処理水濁度（度）、横軸にろ過継続時間（ｍｉｎ）を表している。 An experiment was conducted using a hermetic filtration apparatus shown in FIG. The filter medium for water treatment is filled in the filtration device with the same filter layer compressibility and filter layer height, with the filter medium of the present invention coated with polyethylene on the presser thread and the conventional filter medium mixed with adhesive thread in the core thread. did. The comparison test of the filtration performance was done about the molding filter medium from which an adhesion method differs. The test conditions were as follows: raw water turbidity: 2.5 degrees (kaolin simulation liquid), water flow rate: 60 m / h, packed filter medium amount: constant, washing method: constant. The results are as shown in Table 1. The vertical axis represents the treated water turbidity (degrees) and the horizontal axis represents the filtration duration (min).

使用初期においては、本願発明のモールろ材と、従来のモールろ材のろ過性能はほとんど差はなかった。過去に洗浄を１０回施したモールろ材を用いた場合は、両ろ材のろ過性能に大きな差が生じた。洗浄を１０回経験した従来のモールろ材の処理水濁度は、ろ過開始後除々に上昇し悪化したが、本願発明のモールろ材の処理水濁度はろ過継続時間を通して０．０５度付近で安定した。この現象は、繰り返し洗浄でろ材繊維量に差が生じたことにより発生したと推察される。このろ材繊維量の差は、花糸の脱落の有無に大きく起因している。従来のモールろ材の花糸の脱落現象は、洗浄工程を繰り返すたびに発生するため、モールろ材は序々に痩せていく。この結果、モールろ材のろ過性能は充填繊維量の減少に伴い低下し、安定した濾過運転ができなくなる。 In the initial stage of use, there was almost no difference in the filtration performance between the Mole filter medium of the present invention and the conventional Mole filter medium. When a Mole filter medium that had been washed 10 times in the past was used, a large difference occurred in the filtration performance of both filter media. The treatment water turbidity of the conventional Moll filter medium, which experienced 10 washings, gradually increased and deteriorated after the start of filtration, but the treatment water turbidity of the Mole filter medium of the present invention was stable at around 0.05 degrees throughout the filtration duration. did. This phenomenon is presumed to have occurred due to a difference in the amount of filter medium fibers after repeated washing. This difference in the amount of filter medium fiber is largely attributed to the presence or absence of the drop of the flower yarn. Since the conventional thread-dropping phenomenon of mor filter material occurs every time the washing process is repeated, the mor filter medium gradually fades away. As a result, the filtration performance of the molding filter medium decreases with a decrease in the amount of filled fibers, and a stable filtration operation cannot be performed.

また、従来のモールろ材の洗浄中には、本願発明のモールろ材と同じ洗浄方法を用いたにも関わらず、多くの脱落した花糸が観察できた。本願発明のモールろ材は、洗浄時の脱落花糸が非常に少なく、洗浄を１０回経験してもその発生量に変化は生じなかつた。コーティングした融着剤は、芯糸に混入した従来の接着糸に比較して、花糸を均一に融着させることができ、モールろ材の切断面を加熱して、切断面にほつれ止めを形成したことも起因しているものと思われる。このろ過性能の差は、洗浄経験の増加に伴い増大し、最終的に従来ろ材の処理水濁度は原水濁度に限りなく近づいていくものと予測される。洗浄排水側に脱落した大量の花糸が混入するため、洗浄のたびにそれら脱落花糸の回収が別途必要となる。さらに、回収した花糸くずは廃棄物として処理しなければならない。 Further, during the washing of the conventional Moll filter medium, many dropped flower yarns could be observed even though the same washing method as that of the Mole filter medium of the present invention was used. The Mole filter medium of the present invention has very few falling flower yarns at the time of washing, and even if the washing is experienced 10 times, the amount of generation has not changed. Compared with the conventional adhesive yarn mixed in the core yarn, the coated fusing agent can evenly fuse the flower yarn, and heats the cut surface of the Mole filter media to form a fray stop on the cut surface. It seems that this is also caused by this. This difference in filtration performance increases with increasing cleaning experience, and it is predicted that the treated water turbidity of conventional filter media will eventually approach the raw water turbidity as much as possible. Since a large amount of dropped yarns are mixed on the washing drain side, it is necessary to collect the dropped yarns every time washing is performed. Furthermore, the collected waste yarn must be treated as waste.

この発明に係る水処理用繊維ろ材によれば、花糸の融着強度が、洗浄及びろ過時にモールろ材の花糸の脱落を防止して、洗浄強度の上昇が可能となり、洗浄時間の短縮と洗浄水量の低減が行なわれ、被処理水の大量処理の設備に利用できる。そして、処理水質の安定化ができるので、生活廃水や工場排水等設備だけでなく、浄水や工業用水設備としても利用できる。 According to the fiber filter medium for water treatment according to the present invention, the fusing strength of the flower yarn prevents the fall of the thread of the Mole filter medium during washing and filtration, and the washing strength can be increased, and the washing time is shortened. The amount of washing water is reduced, and it can be used for facilities for mass treatment of treated water. And since the quality of treated water can be stabilized, it can be used not only for facilities such as domestic wastewater and factory wastewater but also for water purification and industrial water facilities.

この発明に係る水処理用繊維ろ材のモール糸の製造方法の概念図である。It is a conceptual diagram of the manufacturing method of the molding thread | yarn of the fiber filter material for water treatment which concerns on this invention. 同じく、撚り合せた芯糸と押え糸の表面に出ている花糸を短くカットしたモール糸の概念図である。Similarly, it is a conceptual diagram of a molding thread obtained by cutting a twisted core thread and a flower thread appearing on the surface of a presser thread. 同じく、モールろ材の概念図である。Similarly, it is a conceptual diagram of a mall filter medium. 同じく、モールろ材の側面図である。Similarly, it is a side view of a molding filter medium. 同じく、他の実施例のモール糸の製造方法の概念図である。Similarly, it is the conceptual diagram of the manufacturing method of the molding yarn of another Example. 同じく、モール糸を用いるろ過装置の縦断面図である。Similarly, it is a longitudinal cross-sectional view of a filtration device using a molding yarn.

符号の説明Explanation of symbols

１芯糸
２、２ａ押え糸
３融着剤
４花糸
５モール糸
７モールろ材 1 Core thread 2, 2a Presser thread 3 Fusing agent 4 Flower thread 5 Mole thread 7 Mole filter medium

Claims

樹脂繊維からなる芯糸（１）と押え糸（２）の両方またはどちらか一方に低融点の融着剤（３）をコーティングして、その芯糸（１）と押え糸（２）を撚り合せながら花糸（４）を巻き付け、同時に花糸（４）を短くカットしてモール糸（５）を形成すると共に、モール糸（５）を加熱処理して、融着剤（３）を溶融させた後、所定の長さに切断してモールろ材（７）とすることを特徴とする水処理用繊維ろ材。 The core yarn (1) and the presser yarn (2) made of resin fibers are coated with a low-melting-point fusion agent (3), and the core yarn (1) and the presser yarn (2) are twisted. The yarn (4) is wound while being aligned, and at the same time, the yarn (4) is cut short to form the molding yarn (5), and the molding yarn (5) is heat-treated to melt the fusing agent (3). After being made to cut, it is cut | disconnected to predetermined length and it is set as a mole filter medium (7), The fiber filter medium for water treatment characterized by the above-mentioned.

上記モール糸（５）のカット時に、モールろ材（７）の芯糸（１）と押え糸（２）の切断面を加熱して、残留している融着剤（３）を溶融し、芯糸（１）と押え糸（２）に挟み込んだ花糸（４）の側端部を融着させることを特徴とする請求項１に記載の水処理用繊維ろ材。 When cutting the molding thread (5), the cutting surfaces of the core thread (1) and the presser thread (2) of the molding filter medium (7) are heated to melt the remaining adhesive (3), and the core The fiber filter medium for water treatment according to claim 1, wherein side ends of the flower yarn (4) sandwiched between the yarn (1) and the presser yarn (2) are fused.

樹脂繊維からなる芯糸（１）と押え糸（２）の両方またはどちらか一方に低融点の融着剤（３）をコーティングして、その芯糸（１）と押え糸（２）を撚り合せながら花糸（４）を巻き付け、巻き付けた花糸（４）を短くカットしてモール糸（５）を形成し、融着剤（３）の軟化点付近まで加熱して花糸（４）を一旦仮止めさせると共に、モール糸（５）を所定の長さに切断してモールろ材を形成し、次にモールろ材（７）を加熱して融着剤（３）を溶融させ、芯糸（１）と押え糸（２）に挟み込んだ花糸（４）を固着させることを特徴とする水処理用繊維ろ材。 The core yarn (1) and the presser yarn (2) made of resin fibers are coated with a low-melting-point fusion agent (3), and the core yarn (1) and the presser yarn (2) are twisted. Wrap the flower yarn (4) together, cut the wound flower yarn (4) short to form a molding yarn (5), and heat it to near the softening point of the fusing agent (3). Is temporarily fixed, the molding thread (5) is cut to a predetermined length to form a molding filter medium, and then the molding filter medium (7) is heated to melt the fusing agent (3), and the core thread A fiber filter medium for water treatment, wherein a flower thread (4) sandwiched between (1) and a presser thread (2) is fixed.

上記押え糸（２）を芯糸（１）より小径として、１本の芯糸（１）と複数本の押え糸（２ａ・・・）を撚り合せ合せながら花糸（４）を巻き付けることを特徴とする請求項１乃至３の何れか１項に記載の水処理用繊維ろ材。 The presser thread (2) has a smaller diameter than the core thread (1), and the flower thread (4) is wound while twisting one core thread (1) and a plurality of presser threads (2a...). The fiber filter medium for water treatment according to any one of claims 1 to 3.

上記芯糸（１）と押え糸（２）にポリエステル、ナイロン等の樹脂繊維と、花糸（４）に加工糸または生糸を用いると共に、融着剤（３）を低融点、高溶融粘度のポリエチレンで構成したことを特徴とする請求項１乃至４の何れか１項に記載の水処理用繊維ろ材。 Resin fibers such as polyester and nylon are used for the core yarn (1) and presser yarn (2), and processed yarn or raw yarn is used for the flower yarn (4), and the fusing agent (3) has a low melting point and a high melt viscosity. The fiber filter medium for water treatment according to any one of claims 1 to 4, wherein the fiber filter medium is made of polyethylene.