JP4631295B2 - Treatment method for wastewater containing phosphorus - Google Patents
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- JP4631295B2 JP4631295B2 JP2004059380A JP2004059380A JP4631295B2 JP 4631295 B2 JP4631295 B2 JP 4631295B2 JP 2004059380 A JP2004059380 A JP 2004059380A JP 2004059380 A JP2004059380 A JP 2004059380A JP 4631295 B2 JP4631295 B2 JP 4631295B2
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- 229910052698 phosphorus Inorganic materials 0.000 title claims description 28
- 239000011574 phosphorus Substances 0.000 title claims description 28
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 title claims description 27
- 239000002351 wastewater Substances 0.000 title claims description 27
- 238000000034 method Methods 0.000 title claims description 15
- 238000006243 chemical reaction Methods 0.000 claims description 26
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 26
- 239000007788 liquid Substances 0.000 claims description 22
- 239000003513 alkali Substances 0.000 claims description 15
- 238000006386 neutralization reaction Methods 0.000 claims description 14
- 239000012141 concentrate Substances 0.000 claims description 13
- 238000000926 separation method Methods 0.000 claims description 8
- 239000003795 chemical substances by application Substances 0.000 claims description 7
- 238000005345 coagulation Methods 0.000 claims description 6
- 230000015271 coagulation Effects 0.000 claims description 6
- 229920000642 polymer Polymers 0.000 claims description 6
- 239000000203 mixture Substances 0.000 claims description 5
- -1 ammonium ions Chemical class 0.000 claims description 4
- JLVVSXFLKOJNIY-UHFFFAOYSA-N Magnesium ion Chemical compound [Mg+2] JLVVSXFLKOJNIY-UHFFFAOYSA-N 0.000 claims description 3
- 229910001425 magnesium ion Inorganic materials 0.000 claims description 3
- MXZRMHIULZDAKC-UHFFFAOYSA-L ammonium magnesium phosphate Chemical compound [NH4+].[Mg+2].[O-]P([O-])([O-])=O MXZRMHIULZDAKC-UHFFFAOYSA-L 0.000 description 43
- 229910052567 struvite Inorganic materials 0.000 description 43
- 239000002245 particle Substances 0.000 description 18
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 15
- TWRXJAOTZQYOKJ-UHFFFAOYSA-L Magnesium chloride Chemical compound [Mg+2].[Cl-].[Cl-] TWRXJAOTZQYOKJ-UHFFFAOYSA-L 0.000 description 12
- 239000007864 aqueous solution Substances 0.000 description 10
- 238000001556 precipitation Methods 0.000 description 9
- 230000002776 aggregation Effects 0.000 description 7
- 238000003860 storage Methods 0.000 description 7
- 239000011777 magnesium Substances 0.000 description 6
- 229910001629 magnesium chloride Inorganic materials 0.000 description 6
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 5
- 238000004220 aggregation Methods 0.000 description 5
- 229910052749 magnesium Inorganic materials 0.000 description 5
- 159000000003 magnesium salts Chemical class 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 5
- 238000002156 mixing Methods 0.000 description 4
- 238000011084 recovery Methods 0.000 description 4
- NLXLAEXVIDQMFP-UHFFFAOYSA-N Ammonium chloride Substances [NH4+].[Cl-] NLXLAEXVIDQMFP-UHFFFAOYSA-N 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 239000013078 crystal Substances 0.000 description 3
- 239000012266 salt solution Substances 0.000 description 3
- 239000010802 sludge Substances 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- 238000005054 agglomeration Methods 0.000 description 2
- 239000012295 chemical reaction liquid Substances 0.000 description 2
- 238000002425 crystallisation Methods 0.000 description 2
- 230000008025 crystallization Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000003672 processing method Methods 0.000 description 2
- 239000013049 sediment Substances 0.000 description 2
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 description 1
- 239000012670 alkaline solution Substances 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 description 1
- 235000019270 ammonium chloride Nutrition 0.000 description 1
- 235000011114 ammonium hydroxide Nutrition 0.000 description 1
- 150000003863 ammonium salts Chemical class 0.000 description 1
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 1
- 239000000920 calcium hydroxide Substances 0.000 description 1
- 235000011116 calcium hydroxide Nutrition 0.000 description 1
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 230000029087 digestion Effects 0.000 description 1
- 238000012851 eutrophication Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000000706 filtrate Substances 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000005189 flocculation Methods 0.000 description 1
- 230000016615 flocculation Effects 0.000 description 1
- 239000010800 human waste Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 244000144972 livestock Species 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 239000008239 natural water Substances 0.000 description 1
- 239000010815 organic waste Substances 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 239000010801 sewage sludge Substances 0.000 description 1
- 239000001488 sodium phosphate Substances 0.000 description 1
- 229910000162 sodium phosphate Inorganic materials 0.000 description 1
- 230000009897 systematic effect Effects 0.000 description 1
- RYFMWSXOAZQYPI-UHFFFAOYSA-K trisodium phosphate Chemical compound [Na+].[Na+].[Na+].[O-]P([O-])([O-])=O RYFMWSXOAZQYPI-UHFFFAOYSA-K 0.000 description 1
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- Separation Of Suspended Particles By Flocculating Agents (AREA)
- Removal Of Specific Substances (AREA)
Description
本発明は、下水、し尿、畜産汚泥の嫌気消化工程で発生する汚泥脱離液や下水汚泥広域処理場の汚泥濃縮分離液及び脱水濾液等のリン含有排水からリンをＭＡＰ粒子として効率的に除去し、優れた処理水質の処理水を得ると共に、高濃度で脱水性に優れたＭＡＰ粒子を得ることができるリン含有排水の処理方法に関する。 The present invention efficiently removes phosphorus as MAP particles from phosphorus-containing wastewater such as sludge effluent generated in the anaerobic digestion process of sewage, human waste and livestock sludge, sludge concentrated separation liquid and dehydrated filtrate of sewage sludge wide-area treatment plant The present invention also relates to a method for treating phosphorus-containing wastewater that can obtain treated water having excellent treated water quality and obtain MAP particles having high concentration and excellent dewaterability.
排液中に含まれるリンは河川、湖沼及び海洋などにおける富栄養化の原因物質の一つであり、排液処理工程で効率的に除去する必要がある。一般に、排水中のリンの除去技術としては、凝集沈殿法、生物脱リン法等が実用化されている。 Phosphorus contained in the effluent is one of the causative substances of eutrophication in rivers, lakes and oceans, and it is necessary to remove it efficiently in the effluent treatment process. In general, as a technique for removing phosphorus in wastewater, a coagulation precipitation method, a biological dephosphorization method, and the like have been put into practical use.
また、リンをＭＡＰ（リン酸マグネシウムアンモニウム）として、回収する晶析装置も実用化されている。 A crystallizer for recovering phosphorus as MAP (magnesium ammonium phosphate) has also been put into practical use.
このＭＡＰ晶析脱リン装置において、ＭＡＰが析出するｐＨ条件、例えばｐＨ約８〜１０となるように、ＮａＯＨ等のアルカリ剤が添加され、また、ＭＡＰの析出にマグネシウムが不足する場合には、ＭｇＣｌ２等のマグネシウム塩溶液を添加し、アンモニア成分が不足するときにはアンモニア溶液やアンモニウム塩溶液を添加する（例えば特開平１１−１０１６８号、特開２００２−１０２６０２号）。 In this MAP crystallization dephosphorization apparatus, an alkaline agent such as NaOH is added so that the pH condition for precipitation of MAP, for example, pH of about 8 to 10, and when magnesium is insufficient for precipitation of MAP, A magnesium salt solution such as MgCl 2 is added, and when the ammonia component is insufficient, an ammonia solution or an ammonium salt solution is added (for example, JP-A Nos. 11-10168 and 2002-102602).
これら公報記載の方法では、上向流方式の反応塔が用いられている。 In the methods described in these publications, an upflow type reaction tower is used.
特開平７−１２４５７１号には、アンモニア性窒素を含有する有機性排水に反応槽内にてＭｇ２＋，ＰＯ４ ３−を加えてＭＡＰ粒子を析出させ、濾過により固液分離してリンを除去する方法が記載されている。
上記特開平７−１２４５７１号の如く反応槽内にてＭＡＰ粒子を析出させた後、固液分離してリン除去を行う脱リン方法においては、反応槽内の全体に万遍なく種晶としてのＭＡＰ粒子が存在し、また、反応槽内の全体においてＭＡＰが生成し易い約８〜１１のｐＨに保たれるべきであるが、排水の流入部付近などにおいては、種晶ＭＡＰ粒子が不足したり、好適ｐＨ範囲から外れてしまい、ＭＡＰ生成効率が低下したり、あるいは処理水水質が低下するおそれがある。 In the dephosphorization method in which MAP particles are precipitated in a reaction vessel as described in JP-A-7-124571, followed by solid-liquid separation to remove phosphorus, the entire reaction vessel is uniformly seeded. MAP particles are present and should be maintained at a pH of about 8 to 11 where MAP is likely to be generated in the entire reaction tank. However, seed crystal MAP particles are insufficient in the vicinity of the inflow portion of waste water. Or out of the preferred pH range, the MAP production efficiency may be reduced, or the quality of the treated water may be reduced.
本発明は、反応槽内の全体に種晶ＭＡＰ粒子を万遍なく存在させたり、あるいは反応槽内全体をＭＡＰ生成に好適なｐＨに保つことが可能であり、これによりＭＡＰ生成効率が高く、処理水水質も良好となるリン含有排水の処理方法を提供することを目的とする。 In the present invention, the seed crystal MAP particles can be uniformly present in the entire reaction tank, or the entire reaction tank can be maintained at a pH suitable for MAP production, which results in high MAP production efficiency. It aims at providing the processing method of the phosphorus containing wastewater from which the quality of treated water also becomes favorable.
本発明のリン含有排水の処理方法は、アルカリ性条件下でリン含有排水中のマグネシウムイオン及びアンモニウムイオンを反応させて不溶物を生成させ、固液分離を行って処理水と不溶物を含んだ濃縮液とに分離するリン含有排水の処理方法において、前記濃縮液の一部を、前記リン含有排水と混合することなくアルカリ剤と混合し、得られたアルカリ混合物をリン含有排水に添加することを特徴とするものである。 The method for treating phosphorus-containing wastewater according to the present invention is a method of reacting magnesium ions and ammonium ions in phosphorus-containing wastewater under alkaline conditions to produce insoluble matter, and performing solid-liquid separation to concentrate containing treated water and insoluble matter. In the method for treating phosphorus-containing wastewater that is separated into liquid, a part of the concentrated liquid is mixed with an alkaline agent without mixing with the phosphorus-containing wastewater, and the obtained alkali mixture is added to the phosphorus-containing wastewater. It is a feature.
本発明では、リン含有排水とマグネシウムイオン、アンモニウムイオン（これらのイオンは、排水中に元々含まれているものであってもよく、排水に添加されたものであってもよい。）との反応及び返送濃縮液との混合は、完全混合型の反応槽（リアクタ）中で行われるのが好ましい。 In the present invention, phosphorus-containing wastewater reacts with magnesium ions and ammonium ions (these ions may be originally contained in the wastewater or may be added to the wastewater). The mixing with the return concentrated liquid is preferably performed in a completely mixed reaction tank (reactor).
本発明では、ＭＡＰ粒子を含んだＭＡＰ生成反応液を固液分離して得られるＭＡＰ粒子含有濃縮液（以下、ＭＡＰ濃縮液ということがある。）の一部を返送してリン含有排水に添加するので、ＭＡＰ生成反応工程において、ＭＡＰ粒子が種晶として槽全体に均一に分散して存在するようになり、脱水性の良い粒径の大きいＭＡＰ粒子を効率良く生成させることができる。 In the present invention, a part of the MAP particle-containing concentrated liquid (hereinafter sometimes referred to as MAP concentrated liquid) obtained by solid-liquid separation of the MAP production reaction liquid containing MAP particles is returned and added to the phosphorus-containing waste water. Therefore, in the MAP generation reaction step, the MAP particles are uniformly dispersed throughout the tank as seed crystals, and MAP particles having a large dehydrating property and a large particle size can be efficiently generated.
その際、この返送されるＭＡＰ濃縮液に、前記リン含有排水と混合することなくアルカリを添加することにより、反応槽全体のｐＨをＭＡＰ生成に好適なｐＨ８〜１１程度に保つことが容易となる。 At that time , by adding alkali to the returned MAP concentrate without mixing with the phosphorus-containing wastewater, it becomes easy to keep the pH of the entire reaction tank at about pH 8 to 11 suitable for MAP production. .
以下、図面を参照して本発明についてさらに詳細に説明する。図１は本発明の実施の形態を表す系統図である。 Hereinafter, the present invention will be described in more detail with reference to the drawings. FIG. 1 is a system diagram showing an embodiment of the present invention.
１は原水の導入管であり、中和槽２に原水を導入する。２Ａは中和槽２に設けられたｐＨ計である。４は中和槽２内の液を凝集槽３に供給する配管であり、１２は凝集槽３にポリマー（高分子凝集剤）を供給する配管である。５は凝集槽３内の液を沈殿槽６に供給する配管である。７は処理水の排出管、８は沈殿槽６で分離されたＭＡＰ濃縮液の抜出管であり、系外への排出管８Ａと、反応槽９への返送管８Ｂとに分岐している。この返送管８Ｂにはポンプ１４が設けられている。
Reference numeral 1 denotes a raw water introduction pipe, which introduces the raw water into the neutralization tank 2. 2A is a pH meter provided in the neutralization tank 2. 4 is a pipe for supplying the liquid in the neutralization tank 2 to the aggregation tank 3, and 12 is a pipe for supplying a polymer (polymer flocculant) to the aggregation tank 3. Reference numeral 5 denotes a pipe for supplying the liquid in the aggregation tank 3 to the precipitation tank 6. 7 is a discharge pipe for treated water, and 8 is a discharge pipe for the MAP concentrate separated in the precipitation tank 6, which branches into a
１０は反応槽９にアルカリ貯槽１１内の水酸化ナトリウム、消石灰等のアルカリ水溶液を供給する配管であり、この配管１０に設けられたアルカリ供給用ポンプ１５は前記ｐＨ計２Ａに連動するように設けられている。１６はマグネシウム剤貯槽であり、塩化マグネシウム等のマグネシウム塩の水溶液が貯えられている。この貯槽１６内のマグネシウム塩水溶液は配管１７を経て、ポンプ１８で反応槽９に供給される。
10 is a pipe for supplying an alkaline aqueous solution such as sodium hydroxide and slaked lime in the
１３は反応槽９からＭＡＰ濃縮液を中和槽２に供給する配管である
本実施の形態において、導入管１からの原水は中和槽２へ供給され、中和槽２において原水は反応槽９から配管１３を経て返送されるＭＡＰ粒子含有濃縮液と混合され、含有されるリンイオンがＭＡＰとして不溶化された後、配管４を経て凝集槽３に供給される。凝集槽３においては、原水とＭＡＰ濃縮液との反応液に配管１２よりポリマーが添加されて、凝集処理される。
凝集槽３において、十分に粒子の粗大化がなされた液は、配管５を経て沈殿槽６に供給されて処理水と沈降物とに分離される。得られた処理水は排出管７より排出され、沈降物（ＭＡＰ粒子含有濃縮液）は抜出管８より抜き出され、その一部が返送管８Ｂより反応槽９に返送され、残りは排出管８Ａより系外へ排出される。
In the agglomeration tank 3, the liquid having sufficiently coarsened particles is supplied to the precipitation tank 6 through the pipe 5 and separated into treated water and sediment. The obtained treated water is discharged from the discharge pipe 7, the sediment (MAP particle-containing concentrated liquid) is extracted from the discharge pipe 8, a part thereof is returned to the reaction tank 9 from the
反応槽９に返送されたＭＡＰ濃縮液は、アルカリ貯槽１１から供給されるアルカリ水溶液及びマグネシウム貯槽１６から供給されるマグネシウム塩水溶液と混合され、ＭＡＰ粒子表面にアルカリが吸着される。このアルカリを吸着したＭＡＰ粒子含有濃縮液は、前記の通り、配管１３により中和槽２に供給される。
The MAP concentrate returned to the reaction tank 9 is mixed with the aqueous alkaline solution supplied from the
ここで、返送管８Ｂより反応槽９に返送するＭＡＰ濃縮液の固形分量は、原水とアルカリ濃縮液との反応で発生する不溶物の量の１５〜４０倍程度が好ましい。
Here, the solid content of the MAP concentrate returned to the reaction tank 9 from the
本実施の形態において、反応槽９へのアルカリの添加量は、中和槽２のｐＨが８．０〜１１．０程度となる量であることが好ましく、マグネシウム剤の添加量は、原水中のリンに対してモル比で１．０〜２．５が望ましい。 In this Embodiment, it is preferable that the addition amount of the alkali to the reaction tank 9 is a quantity from which the pH of the neutralization tank 2 will be about 8.0-11.0, and the addition amount of a magnesium agent is raw | natural water. A molar ratio of 1.0 to 2.5 is desirable with respect to phosphorus.
また、凝集槽３へのポリマー添加量は原水量に対して２〜５ｍｇ／Ｌとすることが望ましい。 The amount of polymer added to the flocculation tank 3 is desirably 2 to 5 mg / L with respect to the amount of raw water.
なお、本発明においては、固液分離手段として、沈殿槽の他、膜分離、遠心分離器等を用いることも可能である。 In the present invention, as a solid-liquid separation means, it is also possible to use a membrane separator, a centrifuge, etc. in addition to a precipitation tank.
晶析反応塔を用いる従来例の場合、薬注部分における薬品の拡散速度が問題となるが、この実施の形態では全ての反応が完全混合槽の中で行われるため、スケールアップを容易に行うことができる。 In the case of the conventional example using the crystallization reaction tower, the diffusion rate of the chemical in the chemical injection part becomes a problem. be able to.
以下、実施例及び比較例について説明する。
［実施例１］
図１に示す装置を用いてリン含有排水の処理を行った、原水としては塩化アンモニウム及びリン酸ナトリウムを含有する合成排水を用いた。濃度はＮＨ４−Ｎ １５０ｍｇ／Ｌ，ＰＯ４−Ｐ ５０ｍｇ／Ｌとした。原水流量は０．４８ｍ３／ｄａｙとした。
Hereinafter, examples and comparative examples will be described.
[Example 1]
The synthetic waste water containing ammonium chloride and sodium phosphate was used as raw water, which was treated with the phosphorus-containing waste water using the apparatus shown in FIG. Concentrations were NH 4 -N 150 mg / L and PO 4 -P 50 mg / L. The raw water flow rate was 0.48 m 3 / day.
アルカリ貯槽１１内のアルカリ水溶液は２５％のＮａＯＨ水溶液とし、マグネシウム剤貯槽１６内のマグネシウム塩水溶液は１．０％の塩化マグネシウム水溶液とした。反応槽９の容量は３Ｌ、中和槽２の容量は４．５Ｌ、凝集槽３の容量は１．５Ｌとした。この凝集槽３では、ポリマー凝集剤を２ｍｇ／Ｌの濃度となるように添加した。
The alkaline aqueous solution in the
反応槽９において、沈殿槽より返送されるＭＡＰ濃縮液に塩化マグネシウム水溶液と、ＮａＯＨ水溶液を添加し、アルカリ性とした濃縮液を中和槽２に返送して原水と混合した。中和槽２のｐＨが８．５になるようにポンプ１５によるＮａＯＨの注入量を調整した。塩化マグネシウム水溶液の添加量は、塩化マグネシウムとして６．０ｇ／Ｈｒとした。沈殿槽６から反応槽９へ返送するＭＡＰ濃縮液量は、その固形物量が原水から発生する固形物量の約３０倍となる量とした。
In the reaction tank 9, a magnesium chloride aqueous solution and a NaOH aqueous solution were added to the MAP concentrate returned from the precipitation tank, and the alkalinized concentrate was returned to the neutralization tank 2 and mixed with raw water. The amount of NaOH injected by the
この結果、Ｔ−Ｐ濃度１７ｍｇ／Ｌ、ＰＯ４−Ｐ濃度１３ｍｇ／Ｌの処理水が得られた。また、ＭＡＰ回収率は９０％であった。 As a result, treated water having a TP concentration of 17 mg / L and a PO 4 -P concentration of 13 mg / L was obtained. The MAP recovery rate was 90%.
［比較例１］
実施例１において、反応槽９にアルカリ及び塩化マグネシウムの添加を行わず、代りにこれらを中和槽２へ直接に供給するようにしたこと以外は同様にして合成排水の処理を行った。
[ Comparative Example 1 ]
In Example 1, the synthetic waste water was treated in the same manner except that the alkali and magnesium chloride were not added to the reaction tank 9 and instead these were directly supplied to the neutralization tank 2.
その結果、処理水のＴ−Ｐ濃度は２３ｍｇ／Ｌ、ＰＯ４−Ｐ濃度は１６ｍｇ／Ｌ、ＭＡＰ回収率は８０％となった。 As a result, the TP concentration of treated water was 23 mg / L, the PO 4 -P concentration was 16 mg / L, and the MAP recovery rate was 80%.
［比較例２］
実施例１において、ポンプ１４を停止し、ＭＡＰ濃縮液の返送を行わなかったこと以外は同様にして合成排水の処理を行った。
[Comparative Example 2 ]
In Example 1, the synthetic waste water was treated in the same manner except that the
その結果、処理水のＴ−Ｐ濃度は２６ｍｇ／Ｌ、ＰＯ４−Ｐ濃度は１４ｍｇ／Ｌ、ＭＡＰ回収率は６７％となった。 As a result, the TP concentration of the treated water was 26 mg / L, the PO 4 -P concentration was 14 mg / L, and the MAP recovery rate was 67%.
これらの実験結果より、返送されるＭＡＰ濃縮液の一部にアルカリを添加してから原水と混合することにより、処理水質が向上し、ＭＡＰ粒子回収率も向上することが認められた。 From these experimental results, it was confirmed that the quality of treated water was improved and the MAP particle recovery rate was improved by adding alkali to a part of the returned MAP concentrate and mixing with raw water .
２ 中和槽
２Ａ ｐＨ計
３ 凝集槽
６ 沈殿槽
９ 反応槽
2
Claims (2)
凝集槽内に供給すると共にポリマーを添加して凝集処理し、While supplying into the coagulation tank and adding polymer, coagulation treatment,
次いで固液分離手段内に供給して前記処理水と前記濃縮液とに分離し、Next, it is supplied into a solid-liquid separation means and separated into the treated water and the concentrated liquid,
該濃縮液の一部を反応槽内でアルカリ剤と混合して前記アルカリ混合物とし、該アルカリ混合物を該中和槽内に供給することを特徴とするリン含有排水の処理方法。A method for treating phosphorus-containing wastewater, wherein a part of the concentrate is mixed with an alkali agent in a reaction tank to form the alkali mixture, and the alkali mixture is supplied into the neutralization tank.
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