JP5017814B2 - Crystallization method - Google Patents

Crystallization method Download PDF

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JP5017814B2
JP5017814B2 JP2005226877A JP2005226877A JP5017814B2 JP 5017814 B2 JP5017814 B2 JP 5017814B2 JP 2005226877 A JP2005226877 A JP 2005226877A JP 2005226877 A JP2005226877 A JP 2005226877A JP 5017814 B2 JP5017814 B2 JP 5017814B2
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phosphorus
fluidized bed
draft tube
draft
crystallization tank
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JP2007038165A (en
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正夫 島田
武志 宮岡
誠 神宮
一郎 住田
ラジブ ゴエル
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Japan Sewage Works Agency
Kurita Water Industries Ltd
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Kurita Water Industries Ltd
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Description

本発明は、流動床方式の反応晶析槽を用いた晶析方法に関するものであり、特に反応晶析槽内に上下方向にドラフト管を設置し、ドラフト管内外で結晶種を循環させるようにした晶析方法に関するものである。 The present invention relates to a crystallization method using a fluidized bed type reaction crystallization tank, and in particular, a draft pipe is installed in the vertical direction in the reaction crystallization tank, and crystal seeds are circulated inside and outside the draft pipe. It relates to a crystallization method.

下水処理場、し尿処理場や工場の排水処理施設からの排水には、リンや場合によってはフッ素、重金属等が含まれており、これらを効率よく除去することが求められている。そして、これらの除去技術として、晶析装置及び晶析方法が開発されている。   Wastewater from sewage treatment plants, human waste treatment plants and factory wastewater treatment facilities contains phosphorus, and in some cases fluorine, heavy metals, and the like, and it is required to remove these efficiently. And as these removal techniques, a crystallization apparatus and a crystallization method have been developed.

晶析脱リン装置として、反応晶析槽内にリン含有水を導入し、反応晶析槽内に結晶種の流動床を形成させながらリン含有水を上向流通水させて、リン含有水中のリンと結晶種とを接触させ、リン含有水中のリンを結晶種の表面に析出させて脱リンするよう構成されたものが知られている。   As a crystallization dephosphorization apparatus, phosphorus-containing water is introduced into the reaction crystallization tank, and the phosphorus-containing water is allowed to flow upward while forming a fluidized bed of crystal seeds in the reaction crystallization tank. It is known that phosphorus and crystal seeds are brought into contact with each other and phosphorus in phosphorus-containing water is deposited on the surface of the crystal seeds for dephosphorization.

本出願人は、反応晶析槽内にリン含有水を導入して、リン含有水中のリンと前記結晶種とを接触させて、リン含有水中のリンをリン酸カルシウム化合物として分離するに際し、反応晶析槽内にドラフト管を設置し、リン含有水を反応晶析槽内で循環させるようにした晶析脱リン方法及び装置を特開２００３−３０５４８１号にて提案している。このようにリン含有水を反応晶析槽で循環させると、反応晶析槽での結晶種とリン含有水との接触頻度が高くなり、結晶種表面への析出が促進され、脱リン効率が向上する。
特開２００３−３０５４８１号 The present applicant introduces phosphorus-containing water into a reaction crystallization tank, brings phosphorus in phosphorus-containing water into contact with the crystal seeds, and separates phosphorus in phosphorus-containing water as a calcium phosphate compound. Japanese Patent Laid-Open No. 2003-305481 proposes a crystallization dephosphorization method and apparatus in which a draft tube is installed in a tank and phosphorus-containing water is circulated in a reaction crystallization tank. When the phosphorus-containing water is circulated in the reaction crystallization tank in this way, the contact frequency between the crystal seeds and the phosphorus-containing water in the reaction crystallization tank increases, the precipitation on the crystal seed surface is promoted, and the dephosphorization efficiency is improved. improves.
JP 2003-305481 A

上記特開２００３−３０５４８１号の晶析脱リン装置にあっては、ドラフト管は、その上端が反応晶析槽内の流動床よりも上位に位置するように設けられている。反応晶析槽内の液は、このドラフト管内で下降流となり、ドラフト管の外周囲で上向流となるように循環される。   In the crystallization dephosphorization apparatus disclosed in Japanese Patent Application Laid-Open No. 2003-305481, the draft tube is provided such that the upper end thereof is positioned higher than the fluidized bed in the reaction crystallization tank. The liquid in the reaction crystallization tank is circulated so as to flow downward in the draft tube and upward in the outer periphery of the draft tube.

この晶析脱リン装置にあっては、ドラフト管外周囲の流動床から上方に飛び出した結晶種がドラフト管上端を回り込んでドラフト管内に流入するが、ドラフト管外周囲に形成されている流動床がオーバーフロー状に直接的にドラフト管内に流れ込むことはない。このため、上記特開２００３−３０５４８１号では、ドラフト管内の結晶種が少ないものとなり、ドラフト管内における結晶種とリンとの接触効率が低下し、脱リン効率が十分には高くならない。   In this crystallization dephosphorization apparatus, the crystal seeds that protrude upward from the fluidized bed around the outside of the draft tube circulate around the upper end of the draft tube and flow into the draft tube. The floor does not flow directly into the draft tube in an overflow state. For this reason, in JP-A-2003-305481, the number of crystal species in the draft tube is small, the contact efficiency between the crystal species and phosphorus in the draft tube is lowered, and the dephosphorization efficiency is not sufficiently increased.

なお、この特開２００３−３０５４８１号において、ドラフト管外周囲における水の上向流速を増大させ、流動床から上方に飛び出してドラフト管内に入り込む結晶種の量を増加させることが考えられるが、このようにするとドラフト管外周囲における流動床の展開率が増大し、流動床内の単位体積当りの結晶種の存在量（結晶種密度）が減少し、反応効率が悪くなる。また、反応晶析槽から流失する結晶種の量も増加する。   In JP-A-2003-305481, it is conceivable to increase the upward flow velocity of water around the outside of the draft tube and increase the amount of crystal seeds that jump out upward from the fluidized bed and enter the draft tube. As a result, the expansion rate of the fluidized bed around the outside of the draft tube increases, the amount of crystal seeds per unit volume in the fluidized bed (crystal seed density) decreases, and the reaction efficiency deteriorates. In addition, the amount of crystal seeds flowing away from the reaction crystallization tank increases.

本発明は、結晶種循環用のドラフト管が反応晶析槽内に設けられている晶析脱リン方法において、ドラフト管内に結晶種を多量に存在させ、ドラフト管内でも十分な脱リン反応を進行させることを目的とする。 The present invention Oite the crystal nuclei phosphorus removal how the draft tube is provided in the reaction crystallization tank for circulation, a large amount of the presence of crystal seeds to the draft tube, sufficient dephosphorization in the draft tube The purpose is to allow the reaction to proceed.

請求項１の晶析方法は、結晶種の流動床が形成された反応晶析槽と、該反応晶析槽内に上下方向に設置されたドラフト管と、該ドラフト管内の結晶種を該ドラフト管の下部又は上部からドラフト管外周囲に向って移動させる移動手段とを有し、該反応晶析槽内の下部に分散板が設置され、該分散板の上側に前記結晶種の流動床が形成され、該ドラフト管は、その上端が、該結晶種が静止している状態で該結晶種充填層の上部よりも上位に位置し、かつ、該流動床の界面よりも下位となるように設置されている晶析装置の反応晶析槽内にリン含有水を導入し、リン含有水中のリンと前記結晶種とを接触させて、リン含有水中のリンをリン酸カルシウム化合物として分離する晶析方法であって、該リン含有水は前記分散板の下側に導入され、該流動床の展開率が３０〜１５０％で処理が行われることを特徴とするものである。 Crystallization method according to claim 1, crystal seed a reaction crystallization tank which fluidized bed is formed of a draft tube disposed vertically in said reaction crystallization tank, the draft seeded of the draft tube have a moving means for moving the bottom or top towards the periphery draft tube outside of the tube, the distribution plate at the bottom of the reaction crystallization tank is installed, said crystal seed of the fluidized bed in the upper of the dispersion plate The draft tube is formed such that its upper end is located higher than the upper part of the packed bed of crystal seeds while the crystal seeds are stationary, and lower than the interface of the fluidized bed. Crystallization method for separating phosphorus in phosphorus-containing water as a calcium phosphate compound by introducing phosphorus-containing water into a reaction crystallization tank of an installed crystallizer and bringing phosphorus in phosphorus-containing water into contact with the crystal seeds The phosphorus-containing water is introduced below the dispersion plate Floor development rate is characterized in that the treatment with 30 to 150% is performed.

請求項２の晶析方法は、請求項１において、前記ドラフト管の上端と流動床の界面との距離が３０〜２００ｃｍであることを特徴とするものである。 Crystallization method according to claim 2, in claim 1, the distance between the upper end and the surface of the fluidized bed of the draft tube is characterized in that it is 30～200Cm.

請求項３の晶析方法は、請求項１又は２において、前記移動手段は、前記ドラフト管内に配置され、回転により該ドラフト管内に下降流を形成される翼体を有することを特徴とするものである。 Crystallization method according to claim 3, in claim 1 or 2, wherein the moving means, the disposed draft tube, which is characterized in that it has a blade body formed of downward flow in the draft tube by rotation It is .

請求項４の晶析方法は、請求項１ないし３のいずれか１項において、前記ドラフト管の下端は、前記分散板から３０〜１００ｃｍ上方に配置されることを特徴とするものである。A crystallization method according to a fourth aspect is characterized in that, in any one of the first to third aspects, the lower end of the draft tube is disposed 30 to 100 cm above the dispersion plate.

本発明の晶析方法では、リン等の晶析対象成分含有水は反応晶析槽内に導入され、該反応晶析槽内で流動している結晶種と接触する。この結晶種の表面にリン等の晶析対象成分が析出することにより晶析対象成分が分離される。 In the crystallization method of the present invention , crystallization target component-containing water such as phosphorus is introduced into the reaction crystallization tank, and comes into contact with the crystal seed flowing in the reaction crystallization tank. Crystallization target components such as phosphorus are deposited on the surface of the crystal seeds to separate the crystallization target components.

本発明においても、前記特開２００３−３０５４８１号と同様に、該反応晶析槽内にドラフト管が設置され、このドラフト管の内部で下降流を形成する。   Also in the present invention, a draft pipe is installed in the reaction crystallization tank, and a downward flow is formed inside the draft pipe, as in JP-A-2003-305481.

本発明では、このドラフト管は、その全体が流動床内に埋設しているので、ドラフト管外周囲に形成されている流動床の結晶種がドラフト管の上端をオーバーフロー状に乗り越えてドラフト管内に流入する。このため、ドラフト管内においても結晶種が十分に多量に存在し、リン等の晶析対象成分含有水と結晶種とが十分に接触し、効率よく晶析反応が進行する。   In the present invention, since the entire draft pipe is embedded in the fluidized bed, the crystal seeds of the fluidized bed formed around the outside of the draft pipe climb over the upper end of the draft pipe in an overflow state and enter the draft pipe. Inflow. Therefore, a sufficiently large amount of crystal seeds are present in the draft tube, and the water containing the crystallized component such as phosphorus and the crystal seeds are in sufficient contact, and the crystallization reaction proceeds efficiently.

また、ドラフト管外周囲において、上向流速を高めなくても、流動床がドラフト管内にスムーズに流れ込むので、ドラフト管外周囲の流動床の展開率を小さくし、流動床の結晶種密度を高めることができる。これによっても晶析効率が向上する。   In addition, the fluidized bed smoothly flows into the draft pipe without increasing the upward flow velocity around the outside of the draft pipe, so the rate of expansion of the fluidized bed around the draft pipe is reduced and the seed density of the fluidized bed is increased. be able to. This also improves the crystallization efficiency.

本発明では、このドラフト管外周囲での上向流速を増大させないことにより、流動床からの結晶種の飛び出しが防止されるようになる。   In the present invention, it is possible to prevent crystal seeds from jumping out of the fluidized bed by not increasing the upward flow velocity around the outside of the draft tube.

以下、図面を参照して実施の形態について説明する。
なお、本実施の形態では本発明の代表的な対象であるリン含有水の処理について説明するが、本発明は、これに限定されるものではなく、フッ素や重金属などの処理にも適用できる。 Hereinafter, embodiments will be described with reference to the drawings.
In addition, although this Embodiment demonstrates the process of phosphorus containing water which is a typical object of this invention, this invention is not limited to this, It can apply also to processes, such as a fluorine and a heavy metal.

図１は実施の形態に係る晶析脱リン装置の系統図、図２は図１の晶析脱リン装置の反応晶析槽の拡大図である。   FIG. 1 is a system diagram of a crystallization dephosphorization apparatus according to the embodiment, and FIG. 2 is an enlarged view of a reaction crystallization tank of the crystallization dephosphorization apparatus of FIG.

原水ピット２内に貯溜された下水処理水等のリン含有排水（リン濃度（ＰＯ４−Ｐとして）は通常は１〜１０ｍｇ／Ｌ）が、原水ポンプ２ａで抜き出され、配管２ｂを介して流動床式の反応晶析槽１に供給される。また、既に反応晶析槽１でリンを分離されて処理水槽４に貯溜された処理水が、ポンプ４ａ及び配管４ｂを介して配管２ｂに供給され、前記ピット２からのリン含有排水が希釈されて反応晶析槽１に供給される。 Phosphorus-containing wastewater such as sewage treated water stored in the raw water pit 2 (normally 1 to 10 mg / L of phosphorus concentration (as PO 4 -P)) is extracted by the raw water pump 2a and via the pipe 2b It is supplied to a fluidized bed type reaction crystallization tank 1. The treated water that has already been separated in the reaction crystallization tank 1 and stored in the treated water tank 4 is supplied to the pipe 2b via the pump 4a and the pipe 4b, and the phosphorus-containing waste water from the pit 2 is diluted. To the reaction crystallization tank 1.

石灰乳タンク３内に貯蔵された石灰乳（消石灰の分散液）は、ポンプ３ａ、配管３ｂ，３ｃ及びバルブ３ｄを介して循環され、該タンク３内の消石灰濃度が均一に維持されている。配管３ｂ，３ｃの結合部から配管３ｅが分岐し、この配管３ｅにバルブ３ｆを介して配管３ｇが接続されている。バルブ３ｆを開とすることにより、配管３ｂ，３ｅ，３ｇを介して反応晶析槽１に石灰乳が供給される。この配管３ｇは、後述のドラフト管１３の上方付近まで延設されており、該配管３ｇから反応晶析槽１内に導入された石灰乳が、反応晶析槽１内を循環するリン含有水の水流に乗るよう構成されている。これにより、反応晶析槽１内の全体に消石灰を速やかに分散させることができる。   The lime milk (slaked lime dispersion) stored in the lime milk tank 3 is circulated through the pump 3a, the pipes 3b and 3c, and the valve 3d, and the slaked lime concentration in the tank 3 is maintained uniformly. A pipe 3e is branched from a joint between the pipes 3b and 3c, and the pipe 3g is connected to the pipe 3e via a valve 3f. By opening the valve 3f, the lime milk is supplied to the reaction crystallization tank 1 through the pipes 3b, 3e, 3g. This piping 3g is extended to the upper part of the draft pipe 13 mentioned later, and the lime milk introduced into the reaction crystallization tank 1 from the piping 3g circulates in the reaction crystallization tank 1 with phosphorus-containing water. It is configured to ride on the water stream. Thereby, slaked lime can be rapidly disperse | distributed to the whole in the reaction crystallization tank 1. FIG.

なお、配管３ｇに対し処理水槽４から配管４ｃ、ポンプ４ｄ及び配管４ｅを介して処理水が導入され、これにより、配管３ｇ内で石灰乳が５〜２５倍に希釈される。石灰乳は、流動床式の反応晶析槽１の流動床１ａのｐＨが６〜１２、好ましくは９．５〜１０．５、処理水のＣａイオン濃度が２０〜１００ｍｇ／Ｌ、好ましくは４０〜６０ｍｇ／Ｌとなるように自動制御されて供給される。   The treated water is introduced into the pipe 3g from the treated water tank 4 through the pipe 4c, the pump 4d, and the pipe 4e, whereby the lime milk is diluted 5 to 25 times in the pipe 3g. In the lime milk, the pH of the fluidized bed 1a of the fluidized bed type reaction crystallization tank 1 is 6 to 12, preferably 9.5 to 10.5, and the Ca ion concentration of treated water is 20 to 100 mg / L, preferably 40. Supplied under automatic control so as to be ˜60 mg / L.

反応晶析槽１の底部には、処理水で希釈されたリン含有水の導入口１１が設けられている。反応晶析槽１内の下部には分散板（ディストリビュータ）１ｃが設置され、その上側に結晶種の流動床１ａが形成される。この結晶種としては、粒径０．１〜１ｍｍ特に０．１５〜０．５ｍｍ程度の骨炭、リン酸カルシウム、リン鉱石などの天然鉱石や人工的に調整した脱リン材を用いることができる。なお、結晶種の粒径が０．１ｍｍ未満では粉砕コストが高くなり、逆に、粒径が１ｍｍ以上では晶析反応速度が遅くなるおそれがある。   At the bottom of the reaction crystallization tank 1, an inlet 11 for phosphorus-containing water diluted with treated water is provided. A dispersion plate (distributor) 1c is installed in the lower part of the reaction crystallization tank 1, and a fluidized bed 1a of crystal seeds is formed on the upper side thereof. As this crystal seed, natural ore such as bone charcoal, calcium phosphate, and phosphate ore having a particle diameter of 0.1 to 1 mm, particularly 0.15 to 0.5 mm, or an artificially adjusted dephosphorization material can be used. Note that if the crystal grain size is less than 0.1 mm, the pulverization cost increases, and conversely, if the grain size is 1 mm or more, the crystallization reaction rate may be slow.

反応晶析槽１内には、反応晶析槽１よりも径の小さな略円筒状のドラフト管１３が設けられている。ドラフト管１３の断面積は、反応晶析槽１の断面積の１／５０〜１／２、特に１／２５〜１／４程度とすることが好ましい。   In the reaction crystallization tank 1, a substantially cylindrical draft tube 13 having a smaller diameter than the reaction crystallization tank 1 is provided. The cross-sectional area of the draft tube 13 is preferably about 1/50 to 1/2, particularly about 1/25 to 1/4 of the cross-sectional area of the reaction crystallization tank 1.

このドラフト管１３は、管軸方向を鉛直方向とし、その全体が流動床１ａに埋設するように設置されている。ドラフト管１３の上端と流動床１ａの界面との距離（高低差）Ｈは３０〜２００ｃｍ特に５０〜１００ｃｍ程度が好適である。また、ドラフト管１３の下端は、前記分散板１ｃから３０〜１００ｃｍ特に４０〜６０ｃｍ程度上方に配置されるのが好ましい。なお、ドラフト管１３の上端は、反応晶析槽内を静置し、結晶種が静止している状態での結晶種充填層の上部よりも上位に位置する。 The draft pipe 13 is installed so that the pipe axis direction is the vertical direction, and the entire pipe pipe 13 is embedded in the fluidized bed 1a. The distance (height difference) H between the upper end of the draft pipe 13 and the interface of the fluidized bed 1a is preferably about 30 to 200 cm, particularly about 50 to 100 cm. Moreover, it is preferable that the lower end of the draft tube 13 is disposed 30 to 100 cm, particularly 40 to 60 cm above the dispersion plate 1c. Incidentally, the upper end of the draft tube 13, the inside of the reaction crystallization vessel was allowed to stand, you positioned higher than the top of the crystal seed filling layer in the state where the crystal seed is stationary.

このドラフト管１３内には、ドラフト管１３内に下降流を形成するために、攪拌機１４のプロペラ式攪拌翼１４ａが配置されている。   In the draft pipe 13, a propeller type stirring blade 14 a of a stirrer 14 is disposed in order to form a downward flow in the draft pipe 13.

反応晶析槽１の上部には、脱リン処理水の流出口１２が設けられている。この流出口１２は、流動床１ａからの結晶種の流失を防止するために、流動床１ａの界面よりも３０ｃｍ以上例えば３０〜１５０ｃｍ特に５０〜１００ｃｍ程度上方に配置されることが好ましい。   At the top of the reaction crystallization tank 1, an outlet 12 for dephosphorized water is provided. The outlet 12 is preferably arranged 30 cm or more, for example, 30 to 150 cm, particularly 50 to 100 cm above the interface of the fluidized bed 1a in order to prevent the loss of crystal seeds from the fluidized bed 1a.

このように構成された晶析脱リン装置では、処理水槽４からの処理水で希釈されたリン含有排水が導入口１１から反応晶析槽１内に導入される。この反応晶析槽１内に導入されるリン含有排水の流量は、撹拌機１４を作動させない状態においても流動床１ａの展開率が３０〜１５０％となるようにする。このようにして反応晶析槽１内に導入されたリン含有排水は、分散板１ｃを通過し、反応晶析槽１内を好ましくは１０〜２０ｍ／ｈｒの線速度ＬＶで上昇し、結晶種を流動化させて流動床１ａを形成する。そして、結晶種とリン含有排水とが接触し、結晶種表面にリン酸カルシウムが析出する。 In the crystallization dephosphorization apparatus configured as described above, phosphorus-containing waste water diluted with the treated water from the treated water tank 4 is introduced into the reaction crystallization tank 1 from the inlet 11. The flow rate of the phosphorus-containing waste water introduced into the reaction crystallization tank 1, even when no the agitator running 14 you like development rate of the fluidized bed 1a is 30 to 150%. The phosphorus-containing wastewater introduced into the reaction crystallization tank 1 in this way passes through the dispersion plate 1c, and rises in the reaction crystallization tank 1 at a linear velocity LV of preferably 10 to 20 m / hr. Is fluidized to form a fluidized bed 1a. Then, the crystal seed comes into contact with the phosphorus-containing waste water, and calcium phosphate is deposited on the surface of the crystal seed.

なお、ここで線速度ＬＶは、反応晶析槽１内に導入されるリン含有排水（配管２ｂを介して供給される原水と配管４ｂを介して供給される処理水との合計）を反応晶析槽１の断面積で除したものである。   Here, the linear velocity LV is a reaction crystal of phosphorus-containing wastewater introduced into the reaction crystallization tank 1 (total of raw water supplied through the pipe 2b and treated water supplied through the pipe 4b). It is divided by the cross-sectional area of the analysis tank 1.

このように撹拌機１４を作動させない状態においても十分に流動床１ａが形成されるような上向流を与えることによって、撹拌機１の動力が小さくても流動床１ａを十分に撹拌混合することが可能となる。   Thus, even if the stirrer 14 is not operated, the fluidized bed 1a can be sufficiently stirred and mixed even if the power of the stirrer 1 is small by giving an upward flow that sufficiently forms the fluidized bed 1a. Is possible.

この晶析脱リン装置では、攪拌機１４を作動させて、プロペラ式攪拌翼１４ａを回転させることにより、ドラフト管１３内に下降流を形成する。このドラフト管１３は、その上端が流動床１ａの界面よりも下位となっているので、ドラフト管１３内に下降流が形成されることにより、ドラフト管１３の外周囲の流動床１ａがドラフト管１３の上端を乗り越えてオーバーフローする如くドラフト管１３内に流入する。この結果、反応晶析槽１内の流動床１ａは、ドラフト管１３内で下降し、ドラフト管１３の外周囲で上昇するという上下方向の循環を行うようになる。特に、ドラフト管１３の上端と流動床１ａの界面との距離Ｈを３０ｃｍ以上と大きくすることにより、ドラフト管１３直近付近だけでなく、流動床１ａの界面付近の全体にドラフト管１３に向う求心方向の流れが形成され、流動床１ａの全体が万遍なく循環するようになる。なお、撹拌機１４を作動させた状態においても、流動床１ａの展開率は３０〜１５０％となるようにする。 In this crystallization dephosphorization apparatus, the downflow is formed in the draft pipe 13 by operating the stirrer 14 and rotating the propeller type stirring blade 14a. Since the upper end of the draft pipe 13 is lower than the interface of the fluidized bed 1 a, a downward flow is formed in the draft pipe 13, so that the fluidized bed 1 a around the draft pipe 13 becomes the draft pipe. It flows into the draft pipe 13 so as to overflow over the upper end of 13. As a result, the fluidized bed 1a in the reaction crystallization tank 1 is circulated in the vertical direction such that the fluidized bed 1a descends in the draft pipe 13 and rises in the outer periphery of the draft pipe 13. In particular, by increasing the distance H between the upper end of the draft pipe 13 and the interface of the fluidized bed 1a to 30 cm or more, the centripetal direction toward the draft pipe 13 is not limited to the vicinity of the draft pipe 13 but the entire vicinity of the interface of the fluidized bed 1a. A directional flow is formed, and the entire fluidized bed 1a circulates uniformly. Even in a state where the agitator running 14, the development rate of the fluidized bed 1a are you to a 30 to 150%.

このようにして、この実施の形態では、ドラフト管１３の外周囲だけでなくドラフト管１３内にも結晶種が十分に存在するようになり、反応晶析槽内の流動床１ａの界面以下の全域において結晶種とリン含有排水とが接触する。しかも流動床１ａの全体がドラフト管１３を通って上下方向に循環して万遍なく攪拌混合される。この結果、脱リン反応が流動床１ａの全域において極めて効率よく進行し、リン濃度の低い処理水を得ることが可能となる。   In this way, in this embodiment, not only the outer periphery of the draft tube 13 but also the crystal seeds are sufficiently present in the draft tube 13, and below the interface of the fluidized bed 1a in the reaction crystallization tank. Crystalline species and phosphorus-containing wastewater are in contact throughout In addition, the entire fluidized bed 1a is circulated in the vertical direction through the draft pipe 13 and uniformly mixed by stirring. As a result, the dephosphorization reaction proceeds very efficiently throughout the fluidized bed 1a, and treated water having a low phosphorus concentration can be obtained.

流動床１ａを上方に通り抜けた水は、処理水として配管１ｂから処理水槽４へ抜き出され、その一部はピット２からのリン含有水やタンク３からの石灰乳の希釈に用いられ、残部は系外に取り出される。   The water that has passed through the fluidized bed 1a is withdrawn from the pipe 1b to the treated water tank 4 as treated water, a part of which is used for diluting phosphorus-containing water from the pit 2 and lime milk from the tank 3, and the remainder Is taken out of the system.

この実施の形態では、上記の通り、流動床１ａの全体においてドラフト管１３を通した結晶種の上下方向の循環運転が生じるので、流動床１ａの上向流速を大きくすることなく、流動床１ａが十分に攪拌混合される。このため、結晶種の展開率を低くし、流動床１ａ内の結晶種密度を高くすることができ、これによっても脱リン効率が向上する。このように流動床１ａの展開率を低くすることにより、動力コストも低減されると共に、流動床の界面が安定化し、結晶種の流失も防止される。   In this embodiment, as described above, since the vertical circulation operation of the crystal seeds through the draft pipe 13 occurs in the entire fluidized bed 1a, the fluidized bed 1a is not increased without increasing the upward flow velocity of the fluidized bed 1a. Is sufficiently stirred and mixed. For this reason, the expansion rate of the crystal seeds can be reduced, and the crystal seed density in the fluidized bed 1a can be increased. This also improves the dephosphorization efficiency. Thus, by lowering the expansion rate of the fluidized bed 1a, the power cost is reduced, the interface of the fluidized bed is stabilized, and the loss of crystal seeds is prevented.

なお、この実施の形態では、ドラフト管１３内における下向きの流量を、流入口１１からの流入水量の２倍以上特に４〜１０倍とすることが好ましい。   In this embodiment, the downward flow rate in the draft pipe 13 is preferably at least twice the amount of inflow water from the inflow port 11, particularly 4 to 10 times.

上記実施の形態ではピット２からの原水を処理水の一部で希釈しているが、ピット２からの原水を、希釈することなくそのまま反応晶析槽１に導入してもよい。   In the above embodiment, the raw water from the pit 2 is diluted with a part of the treated water, but the raw water from the pit 2 may be directly introduced into the reaction crystallization tank 1 without dilution.

上記実施の形態ではドラフト管１３を１本だけ設置しているが、２本以上設置してもよい。ただし、反応晶析槽１の直径が３ｍ以下の場合は、ドラフト管を１本設置するだけで十分である。   In the above embodiment, only one draft pipe 13 is installed, but two or more draft pipes may be installed. However, when the diameter of the reaction crystallization tank 1 is 3 m or less, it is sufficient to install one draft tube.

上記実施の形態ではプロペラ翼式の攪拌機１４を設置しているが、水中ミキサなど結晶種を破砕しにくい構造のものであれば、他方式のものを用いてもよい。   Although the propeller blade type stirrer 14 is installed in the above-described embodiment, any other system may be used as long as it has a structure that makes it difficult to crush crystal seeds, such as an underwater mixer.

また、撹拌翼は高速で回転させると結晶種を破砕する恐れがあるため、撹拌機の回転数は低回転数であることが好ましく、具体的には翼周速が３００ｍ／ｍｉｎ以下、特に２００ｍ／ｍｉｎ以下であることが好ましい。   In addition, if the stirring blade is rotated at a high speed, the crystal seeds may be crushed. Therefore, the rotational speed of the stirrer is preferably a low rotational speed. Specifically, the peripheral speed of the blade is 300 m / min or less, particularly 200 m. / Min or less is preferable.

上記実施の形態では反応晶析槽１に石灰乳を添加しているが、塩化カルシウム等を添加してもよい。ただし、Ｃａ（ＯＨ）２はカルシウムイオン供給源だけでなくｐＨ調整用アルカリ剤としても使用できるので、石灰乳を用いるのが好ましい。 In the above embodiment, lime milk is added to the reaction crystallization tank 1, but calcium chloride or the like may be added. However, since Ca (OH) 2 can be used not only as a calcium ion supply source but also as a pH adjusting alkaline agent, it is preferable to use lime milk.

上記実施の形態では、反応晶析槽１の側壁の上部に単に流出口１２を設けているが、反応晶析槽１内のリン含有水の流動床１ａの界面と流出口１２との間に整流板を設けて、反応晶析槽１から結晶種が流出するのを防止するようにしてもよい。結晶種表面が微生物により著しく汚染される場合には、次亜塩素酸ソーダを数ｐｐｍ添加し、又は、オゾン処理して汚染を除去した後に、反応晶析槽１内に導入してもよい。ドラフト管１３の形状は円筒形が好適であるが、これに限定されない。   In the said embodiment, although the outflow port 12 is simply provided in the upper part of the side wall of the reaction crystallization tank 1, it is between the interface of the fluidized bed 1a of the phosphorus containing water in the reaction crystallization tank 1, and the outflow port 12. A rectifying plate may be provided to prevent the crystal seeds from flowing out of the reaction crystallization tank 1. When the crystal seed surface is significantly contaminated by microorganisms, sodium hypochlorite may be added in several ppm, or may be introduced into the reaction crystallization tank 1 after removing the contamination by ozone treatment. The shape of the draft tube 13 is preferably a cylindrical shape, but is not limited thereto.

実施の形態に係る晶析脱リン装置の系統図である。It is a systematic diagram of the crystallization dephosphorization apparatus which concerns on embodiment. 図１の晶析脱リン装置の反応晶析槽の拡大図である。It is an enlarged view of the reaction crystallization tank of the crystallization dephosphorization apparatus of FIG.

１ 反応晶析槽
１ａ 流動床
１ｃ 分散板（ディストリビュータ）
４ 処理水槽
１３ ドラフト管
１４ 攪拌機 1 Reaction Crystallization Tank 1a Fluidized Bed 1c Dispersion Plate (Distributor)
4 Treated water tank 13 Draft tube 14 Stirrer

Claims (4)

結晶種の流動床が形成された反応晶析槽と、
該反応晶析槽内に上下方向に設置されたドラフト管と、
該ドラフト管内の結晶種を該ドラフト管の下部又は上部からドラフト管外周囲に向って移動させる移動手段とを有し、
該反応晶析槽内の下部に分散板が設置され、該分散板の上側に前記結晶種の流動床が形成され、
該ドラフト管は、その上端が、該結晶種が静止している状態で該結晶種充填層の上部よりも上位に位置し、かつ、該流動床の界面よりも下位となるように設置されている晶析装置の反応晶析槽内にリン含有水を導入し、リン含有水中のリンと前記結晶種とを接触させて、リン含有水中のリンをリン酸カルシウム化合物として分離する晶析方法であって、
該リン含有水は前記分散板の下側に導入され、
該流動床の展開率が３０〜１５０％で処理が行われることを特徴とする晶析方法。 A reaction crystallization tank in which a fluidized bed of crystal seeds is formed;
A draft tube installed vertically in the reaction crystallization tank;
Crystal seeds of the draft tube have a moving means for moving towards the draft tube outer periphery of the bottom or top of the draft tube,
A dispersion plate is installed in the lower part of the reaction crystallization tank, and a fluidized bed of the crystal seeds is formed on the upper side of the dispersion plate.
The draft pipe is installed such that the upper end thereof is positioned higher than the upper part of the crystal seed packed bed in a state where the crystal seeds are stationary and lower than the interface of the fluidized bed. A crystallization method in which phosphorus-containing water is introduced into a reaction crystallization tank of a crystallization apparatus , phosphorus in the phosphorus-containing water is brought into contact with the crystal seeds, and phosphorus in the phosphorus-containing water is separated as a calcium phosphate compound. ,
The phosphorus-containing water is introduced below the dispersion plate;
The crystallization method is characterized in that the treatment is carried out at a development rate of the fluidized bed of 30 to 150% . 請求項１において、前記ドラフト管の上端と流動床の界面との距離が３０〜２００ｃｍであることを特徴とする晶析方法。 According to claim 1, crystallization method the distance between the upper end and the surface of the fluidized bed of the draft tube, characterized in that a 30～200Cm. 請求項１又は２において、前記移動手段は、前記ドラフト管内に配置され、回転により該ドラフト管内に下降流を形成される翼体を有することを特徴とする晶析方法。 According to claim 1 or 2, wherein the moving means, the disposed draft tube, crystallization method characterized by having an airfoil body formed of downward flow in the draft tube by rotation. 請求項１ないし３のいずれか１項において、前記ドラフト管の下端は、前記分散板から３０〜１００ｃｍ上方に配置されることを特徴とする晶析方法。4. The crystallization method according to claim 1, wherein a lower end of the draft tube is disposed 30 to 100 cm above the dispersion plate. 5.
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