JPH11267665A - Dephosphorizing device - Google Patents
Dephosphorizing deviceInfo
- Publication number
- JPH11267665A JPH11267665A JP7231598A JP7231598A JPH11267665A JP H11267665 A JPH11267665 A JP H11267665A JP 7231598 A JP7231598 A JP 7231598A JP 7231598 A JP7231598 A JP 7231598A JP H11267665 A JPH11267665 A JP H11267665A
- Authority
- JP
- Japan
- Prior art keywords
- reaction tower
- map
- particles
- water
- large diameter
- 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.)
- Pending
Links
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明はリン含有水中のリン
をＭＡＰ（リン酸マグネシウムアンモニウム）として除
去、回収する装置に係り、特に反応塔内の下部における
ＭＡＰ粒子同士の固着を防止するよう改良した脱リン装
置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for removing and recovering phosphorus in water containing phosphorus as MAP (magnesium ammonium phosphate), and particularly to an apparatus for preventing MAP particles from sticking to each other at a lower portion in a reaction tower. It relates to a dephosphorization device.
【０００２】[0002]
【従来の技術】下水、し尿、排水等の嫌気、好気処理工
程で発生する汚泥脱水濾液、消化脱離液等のリン含有水
からリンを除去する装置として、リン含有水中にマグネ
シウムイオンを添加して、該水中に含有されるアンモニ
ア及びリンとマグネシウムとからＭＡＰを生成させ、生
成したＭＡＰ粒子を分離回収する装置がある。2. Description of the Related Art Magnesium ions are added to phosphorus-containing water as a device for removing phosphorus from phosphorus-containing water such as sludge dewatered filtrate and digestion desorbed liquid generated in anaerobic and aerobic treatment processes such as sewage, human waste, and wastewater. Then, there is an apparatus for generating MAP from ammonia and phosphorus and magnesium contained in the water, and separating and recovering the generated MAP particles.
【０００３】このＭＡＰ生成反応を利用する従来の脱リ
ン装置の一つとして、原水を反応塔下部に導入し、処理
水を反応塔上部より取り出すと共に、循環手段により該
反応塔の上部から処理水の一部を該反応塔下部へ循環さ
せるものがある。As one of the conventional dephosphorizers utilizing this MAP formation reaction, raw water is introduced into the lower part of the reaction tower, treated water is taken out from the upper part of the reaction tower, and treated water is circulated from the upper part of the reaction tower by means of circulation. Some are circulated to the lower part of the reaction tower.
【０００４】この脱リン装置において、ＭＡＰ粒子は上
昇する水流により展開されている。この上昇水流は、原
水と循環水とが混ざったものである。[0004] In this dephosphorization apparatus, the MAP particles are developed by a rising water flow. This rising water flow is a mixture of raw water and circulating water.
【０００５】この脱リン装置から回収されたＭＡＰ粒子
を移送、脱水、乾燥等する場合、ＭＡＰ粒子は１ｍｍ以
上の大きな粒径を有していることが望ましい。When the MAP particles recovered from the dephosphorizer are transferred, dehydrated, dried, or the like, it is desirable that the MAP particles have a large particle size of 1 mm or more.
【０００６】[0006]
【発明が解決しようとする課題】このような大径のＭＡ
Ｐ粒子は、反応塔内において上昇流によっても展開され
ず沈降したままとなり易い。即ち、粒径３ｍｍのＭＡＰ
粒子の流動化開始速度（空塔速度）は、約１００ｍ／Ｈ
ｒであり、上昇水流がそれよりも低速であるとＭＡＰ粒
子は反応塔下部に沈降したままとなる。このように沈降
したままのＭＡＰ粒子は、粒子同士の間にＭＡＰが析出
し粒子同士が固着してしまい、やがて反応塔下部のＭＡ
Ｐ粒子が固形化するようになる。このようにＭＡＰ粒子
が固形化すると、ＭＡＰ粒子を反応塔の底部から引き抜
くことは不可能となり、酸溶解や棒で突くなどの特別な
対策をとらざるを得なくなる。SUMMARY OF THE INVENTION Such a large-diameter MA
The P particles are likely to remain settled in the reaction tower without being developed even by the upward flow. That is, a MAP having a particle size of 3 mm
The fluidization start velocity (superficial velocity) of the particles is about 100 m / H
If the ascending water flow is slower, the MAP particles will remain settled at the bottom of the reactor. In the MAP particles that have settled in this way, MAP precipitates between the particles and the particles are fixed to each other, and eventually the MA in the lower part of the reaction tower is removed.
P particles become solidified. When the MAP particles are solidified in this way, it becomes impossible to pull out the MAP particles from the bottom of the reaction tower, and special measures such as acid dissolution and sticking with a stick have to be taken.
【０００７】本発明は、このようなＭＡＰ粒子の固形化
を防止し、反応塔下部から常にＭＡＰ粒子をスムーズに
抜き出すことが可能な脱リン装置を提供することを目的
とする。[0007] It is an object of the present invention to provide a dephosphorization apparatus capable of preventing such MAP particles from being solidified and constantly extracting MAP particles smoothly from the lower portion of the reaction tower.
【０００８】[0008]
【発明が解決しようとする課題】本発明の脱リン装置
は、原水を反応塔下部に導入し、処理水を反応塔上部よ
り取り出すと共に、循環手段により該反応塔の上部から
水の一部を該反応塔下部へ循環させる脱リン装置におい
て、該反応塔の下部に該塔の水平断面積よりも小さい水
平断面積を有した（好ましくは筒状の）貯留部を設け、
該貯留部に対し前記循環手段により水を循環させるよう
にしたことを特徴とするものである。In the dephosphorizer of the present invention, raw water is introduced into the lower part of the reaction tower, treated water is taken out from the upper part of the reaction tower, and a part of the water is removed from the upper part of the reaction tower by the circulation means. In the dephosphorizer circulating to the lower part of the reaction tower, a (preferably cylindrical) storage part having a horizontal cross-sectional area smaller than the horizontal cross-sectional area of the tower is provided at the lower part of the reaction tower,
Water is circulated to the storage section by the circulation means.
【０００９】かかる脱リン装置においては、循環水を水
平断面積が小さい貯留部に導入するため、貯留部におけ
る上昇水流速が大きなものとなり、大径のＭＡＰ粒子で
あっても貯留部内において流動するようになる。このた
め、反応塔下部内におけるＭＡＰ粒子同士の固着が防止
される。In such a dephosphorization apparatus, since the circulating water is introduced into the storage section having a small horizontal cross-sectional area, the rising water flow velocity in the storage section becomes large, and even large-diameter MAP particles flow in the storage section. Become like For this reason, MAP particles are prevented from sticking to each other in the lower portion of the reaction tower.
【００１０】[0010]
【発明の実施の形態】図１は実施の形態に係る脱リン装
置の模式的な断面図である。FIG. 1 is a schematic sectional view of a dephosphorizing apparatus according to an embodiment.
【００１１】反応塔１は、下部が小径円筒状の貯留部１
１となっており、この貯留部１１の上側が上方に向って
拡径するテーパ部１２となっており、該テーパ部１２の
上側が大径の大径部１３となっている。この反応塔１の
頂部は開放している。The reaction tower 1 has a storage section 1 having a small cylindrical portion at its lower part.
The upper side of the storage portion 11 is a tapered portion 12 whose diameter increases upward, and the upper side of the tapered portion 12 is a large diameter portion 13 having a large diameter. The top of the reaction tower 1 is open.
【００１２】このテーパ部１２に原水（下水、し尿の嫌
気消化脱離液、生し尿等のリン含有水）の導入配管２が
接続され、テーパ部１２の直上の大径部１３下部にはＭ
ｇＣｌ2等のマグネシウム塩溶液（マグネシウム塩を含
有するものであれば良く、海水であっても良い。）の供
給管３及びＮａＯＨ等のアルカリ剤の供給管４が接続さ
れている。An inlet pipe 2 for raw water (phosphorus water such as sewage, anaerobic digestion and desorbed liquid of night soil, raw human urine, etc.) is connected to the tapered portion 12.
A supply pipe 3 for a magnesium salt solution such as gCl 2 (so long as it contains a magnesium salt and may be seawater) and a supply pipe 4 for an alkali agent such as NaOH are connected.
【００１３】反応塔１の上部には循環配管５の流入側が
接続されており、この循環配管５の流出側は貯留部１１
の下部（底部であっても良い。）に接続されている。こ
の配管５には循環ポンプ５ａが設けられている。An inflow side of a circulation pipe 5 is connected to an upper portion of the reaction tower 1.
Is connected to a lower portion (or a bottom portion). The piping 5 is provided with a circulation pump 5a.
【００１４】該貯留部１１の底部にはＭＡＰ粒子の抜き
出し用の配管６が接続されており、この配管６にはバル
ブ７が設けられている。反応塔１の最上部には溢流堰８
が設けられ、この溢流堰８に処理水の取出用の配管９が
接続されている。A pipe 6 for extracting MAP particles is connected to the bottom of the storage section 11, and the pipe 6 is provided with a valve 7. At the top of the reaction tower 1 is an overflow weir 8
A pipe 9 for taking out treated water is connected to the overflow weir 8.
【００１５】このように構成された脱リン装置の作動に
ついて次に説明する。The operation of the thus-configured dephosphorizer will be described below.
【００１６】反応塔１には、ＭＡＰが析出するｐＨ条
件、即ちｐＨ８〜１０となるように、供給管４よりＮａ
ＯＨ等のアルカリ剤が注入される。また、ＭＡＰの析出
にマグネシウムが不足する場合には、供給管３よりＭｇ
Ｃｌ2等のマグネシウム塩溶液を注入する。In the reaction tower 1, Na is supplied through the supply pipe 4 so that the pH condition at which MAP is precipitated, that is, pH 8-10.
An alkaline agent such as OH is injected. When magnesium is insufficient for MAP precipitation, Mg is supplied from the supply pipe 3.
Inject a magnesium salt solution such as Cl 2 .
【００１７】反応塔１内では、既に析出しているＭＡＰ
粒子を種晶としてＭＡＰが造粒される。即ち、原水の流
入と処理水の循環とによりＭＡＰ粒子が流動状態とな
り、このＭＡＰ粒子の表面に新たなＭＡＰが析出して、
ＭＡＰ粒子が粒成長する。In the reaction tower 1, MAP which has already been deposited
MAP is granulated using the particles as seed crystals. That is, the MAP particles are brought into a fluidized state by the inflow of the raw water and the circulation of the treated water, and new MAP is deposited on the surface of the MAP particles.
The MAP particles grow.
【００１８】このＭＡＰの析出プロセスにおいて、原水
のリン濃度が高いと、種晶の不存在下でＭＡＰの微小結
晶が自己析出し、大粒のＭＡＰ粒子が得られないという
不具合があるが、この脱リン装置では、反応塔１の処理
水を配管５及びポンプ５ａにより抜き出して循環するこ
とにより、反応塔１内のＭＡＰ造粒反応部のリン濃度を
低下させることができる。これにより反応塔１内のＭＡ
Ｐの過飽和度が低下し、ＭＡＰは微小結晶として自己析
出することなく、種晶のＭＡＰ粒子の表面でのみ析出し
てＭＡＰ粒子の大粒子化を促進する。この処理水の循環
は、反応塔１内のＭＡＰ造粒反応部のリン濃度をリン酸
塩濃度１００ｍｇ／Ｌ以下、特に４０〜８０ｍｇ／Ｌと
なるように行うのが好ましい。In the MAP precipitation process, if the phosphorus concentration of the raw water is high, there is a problem that MAP microcrystals are self-precipitated in the absence of seed crystals and large MAP particles cannot be obtained. In the phosphorus device, the treated water in the reaction tower 1 is extracted and circulated by the pipe 5 and the pump 5a, so that the phosphorus concentration in the MAP granulation reaction section in the reaction tower 1 can be reduced. Thereby, the MA in the reaction tower 1
The supersaturation degree of P decreases, and MAP does not self-precipitate as microcrystals, but precipitates only on the surface of seed MAP particles and promotes the enlargement of MAP particles. It is preferable that the circulation of the treated water be performed so that the phosphorus concentration in the MAP granulation reaction section in the reaction tower 1 is not more than 100 mg / L, particularly preferably 40 to 80 mg / L.
【００１９】ＭＡＰの析出により、リン濃度が低下した
処理水は反応塔１内を上昇して溢流堰８を越え、配管９
より排出される。The treated water whose phosphorus concentration has decreased due to the precipitation of MAP rises in the reaction tower 1, exceeds the overflow weir 8, and passes through the pipe 9.
Is more exhausted.
【００２０】反応塔１内で粒大化したＭＡＰ粒子は、反
応塔１下部の貯留部１１に沈降してくるが、この貯留部
１１の径（水平断面積）が小さく、循環配管５から流入
する循環水の上昇流速が１００ｍ／Ｈｒ以上となってい
る。このため、粒径１ｍｍ程度の大径のＭＡＰ粒子もこ
の貯留部１１内で流動するようになり、貯留部１１にお
けるＭＡＰ粒子の固化が防止される。The MAP particles that have become large in the reaction tower 1 settle in the storage section 11 below the reaction tower 1, but the diameter (horizontal cross-sectional area) of the storage section 11 is small, and the MAP particles flow in from the circulation pipe 5. The rising flow velocity of the circulating water is 100 m / Hr or more. For this reason, the large-diameter MAP particles having a particle diameter of about 1 mm also flow in the storage section 11, and the MAP particles in the storage section 11 are prevented from being solidified.
【００２１】反応塔１内のＭＡＰ粒子量が過剰になった
場合は、ポンプ５ａを停止し、バルブ７を開いて貯留部
１１からＭＡＰ粒子を排出する。この場合、ＭＡＰ粒子
相互が固着していないので、ＭＡＰ粒子はきわめてスム
ーズに排出される。When the amount of MAP particles in the reaction tower 1 becomes excessive, the pump 5a is stopped, the valve 7 is opened, and the MAP particles are discharged from the storage unit 11. In this case, since the MAP particles do not adhere to each other, the MAP particles are discharged very smoothly.
【００２２】なお、図１の脱リン装置において、テーパ
部１２の水平に対する傾斜角度は６０°以上（例えば６
０〜７５°）とするのが好ましい。In the dephosphorizer shown in FIG. 1, the inclination angle of the tapered portion 12 with respect to the horizontal is 60 ° or more (for example, 6 °).
0 to 75).
【００２３】大径部１３及び貯留部１１を円筒形とする
場合、貯留部１１の径は大径部１３の径の１／５以下
（例えば１／５〜１／８）とするのが好ましい。When the large diameter portion 13 and the storage portion 11 are cylindrical, the diameter of the storage portion 11 is preferably １ ／ or less (for example, ５〜 to ８) of the diameter of the large diameter portion 13. .
【００２４】循環配管５の流入端は、反応塔１内の液面
から１００ｃｍ以内（例えば５０〜１００ｃｍ）の高さ
に接続されるのが好ましい。The inflow end of the circulation pipe 5 is preferably connected to a height of 100 cm or less (for example, 50 to 100 cm) from the liquid level in the reaction tower 1.
【００２５】配管３，４の接続部は、テーパ部１２の上
端から３０ｃｍ以内（例えば１０〜３０ｃｍ）に接続さ
れるのが好ましい。原水配管２は、テーパ部１２の下端
から２０ｃｍ以内（例えば５〜２０ｃｍ）に接続される
のが好ましい。The connecting portions of the pipes 3 and 4 are preferably connected within 30 cm (for example, 10 to 30 cm) from the upper end of the tapered portion 12. The raw water pipe 2 is preferably connected within 20 cm (for example, 5 to 20 cm) from the lower end of the tapered portion 12.
【００２６】貯留部１１における上昇流速は１００ｍ／
Ｈｒ以上とくに１２０ｍ／Ｈｒ以上（例えば１２０〜１
６０ｍ／Ｈｒ）とするのが好ましい。この流速の場合、
粒径１〜２ｍｍのＭＡＰ粒子の展開率は約３０〜５０％
となる。The rising flow velocity in the storage section 11 is 100 m /
Hr or more, especially 120 m / Hr or more (for example, 120 to 1
60 m / Hr). At this flow rate,
The expansion rate of MAP particles having a particle size of 1 to 2 mm is about 30 to 50%
Becomes
【００２７】なお、図示の例では、マグネシウム塩及び
アルカリ剤のみを添加しているが、ＭＡＰの生成にアン
モニア成分が不足する場合には、反応塔に更にアンモニ
ウムやアンモニウム塩を添加する。In the illustrated example, only the magnesium salt and the alkali agent are added. However, when the ammonia component is insufficient for the generation of MAP, ammonium or an ammonium salt is further added to the reaction tower.
【００２８】本発明において、反応塔及び貯留部の水平
断面は円に限らず、方形や多角形の筒形であっても良い
が、円筒形であることが好ましい。In the present invention, the horizontal cross section of the reaction tower and the storage section is not limited to a circle, but may be a square or polygonal cylinder, but is preferably a cylinder.
【００２９】[0029]
【発明の効果】以上の通り、本発明によるとＭＡＰ粒子
が大径に成長しても反応塔の貯留部内で十分に流動する
ようになり、沈下したまま固着することが無い。従っ
て、本発明の脱リン装置によると、反応塔の底部からＭ
ＡＰ粒子をスムーズに排出することが可能となる。As described above, according to the present invention, even when the MAP particles grow to a large diameter, they flow sufficiently in the storage part of the reaction tower, and do not adhere as they sink. Therefore, according to the dephosphorization apparatus of the present invention, M
AP particles can be discharged smoothly.
【図１】実施の形態に係る脱リン装置の断面図である。FIG. 1 is a cross-sectional view of a phosphorus removal device according to an embodiment.
１ 反応塔 ５ 循環配管 １１ 貯留部 １２ テーパ部 １３ 大径部 DESCRIPTION OF SYMBOLS 1 Reaction tower 5 Circulation piping 11 Storage part 12 Tapered part 13 Large diameter part
───────────────────────────────────────────────────── フロントページの続き (72)発明者 石塚 諭 東京都新宿区西新宿３丁目４番７号 栗田 工業株式会社内 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Satoshi Ishizuka 3-4-7 Nishi-Shinjuku, Shinjuku-ku, Tokyo Inside Kurita Water Industries Ltd.
Claims (1)
応塔上部より取り出すと共に、循環手段により該反応塔
の上部から水の一部を該反応塔下部へ循環させる脱リン
装置において、 該反応塔の下部に該塔の水平断面積よりも小さい水平断
面積を有した貯留部を設け、該貯留部に対し前記循環手
段により水を循環させるようにしたことを特徴とする脱
リン装置。1. A dephosphorizer for introducing raw water into a lower portion of a reaction tower, removing treated water from an upper portion of the reaction tower, and circulating a part of water from an upper portion of the reaction tower to a lower portion of the reaction tower by a circulating means. A dephosphorizer having a storage section having a horizontal cross-sectional area smaller than the horizontal cross-sectional area of the tower provided at a lower portion of the reaction tower, and circulating water in the storage section by the circulation means. .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7231598A JPH11267665A (en) | 1998-03-20 | 1998-03-20 | Dephosphorizing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7231598A JPH11267665A (en) | 1998-03-20 | 1998-03-20 | Dephosphorizing device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH11267665A true JPH11267665A (en) | 1999-10-05 |
Family
ID=13485732
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7231598A Pending JPH11267665A (en) | 1998-03-20 | 1998-03-20 | Dephosphorizing device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH11267665A (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005095726A (en) * | 2003-09-22 | 2005-04-14 | Mitsubishi Materials Corp | Reacting/crystallizing method and apparatus therefor |
| WO2005077834A1 (en) | 2004-02-13 | 2005-08-25 | The University Of British Columbia | Fluidized bed wastewater treatment |
| JP2005329398A (en) * | 2004-04-20 | 2005-12-02 | Ishikawajima Harima Heavy Ind Co Ltd | Dephosphorization apparatus |
| JP2006239648A (en) * | 2005-03-07 | 2006-09-14 | Ishikawajima Harima Heavy Ind Co Ltd | Apparatus for dephosphorization |
| EP2489641A1 (en) | 2011-02-15 | 2012-08-22 | Ostara Nutrient Recovery Technologies Inc. | Methods and apparatus for struvite recovery using upstream CO2 injection |
| EP2489640A1 (en) | 2011-02-15 | 2012-08-22 | Ostara Nutrient Recovery Technologies Inc. | Methods and apparatus for struvite recovery using upstream phosphate injection |
| US8263034B2 (en) | 2008-02-11 | 2012-09-11 | Entechs Co. | Nitrogen-rich waste water treatment method and method for producing struvite |
| EP2683659A1 (en) * | 2011-03-10 | 2014-01-15 | Ostara Nutrient Recovery Technologies Inc. | Reactor for precipitating solutes from wastewater and associated methods |
| CN113443692A (en) * | 2020-03-27 | 2021-09-28 | 赛奇·洛巴诺夫 | Method and apparatus for recovering size-selected nutrients from wastewater by elutriation |
| KR102330774B1 (en) * | 2021-03-03 | 2021-11-24 | 이주봉 | Ozone dissolution reaction apparatus for advanced oxidation treatment |
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1998
- 1998-03-20 JP JP7231598A patent/JPH11267665A/en active Pending
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| US8263034B2 (en) | 2008-02-11 | 2012-09-11 | Entechs Co. | Nitrogen-rich waste water treatment method and method for producing struvite |
| EP2489641A1 (en) | 2011-02-15 | 2012-08-22 | Ostara Nutrient Recovery Technologies Inc. | Methods and apparatus for struvite recovery using upstream CO2 injection |
| EP2489640A1 (en) | 2011-02-15 | 2012-08-22 | Ostara Nutrient Recovery Technologies Inc. | Methods and apparatus for struvite recovery using upstream phosphate injection |
| EP2683659A1 (en) * | 2011-03-10 | 2014-01-15 | Ostara Nutrient Recovery Technologies Inc. | Reactor for precipitating solutes from wastewater and associated methods |
| KR20140014222A (en) * | 2011-03-10 | 2014-02-05 | 오스타라 뉴트리언트 리커버리 테크놀로지스 인크. | Reactor for precipitating solutes from wastewater and associated methods |
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| US10266433B2 (en) | 2011-03-10 | 2019-04-23 | Ostara Nutrient Recovery Technologies Inc. | Reactor for precipitating solutes from wastewater and associated methods |
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| KR102330774B1 (en) * | 2021-03-03 | 2021-11-24 | 이주봉 | Ozone dissolution reaction apparatus for advanced oxidation treatment |
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