JPH0985263A - Treatment of phosphorus in activated alumina desorbed solution - Google Patents
Treatment of phosphorus in activated alumina desorbed solutionInfo
- Publication number
- JPH0985263A JPH0985263A JP25074495A JP25074495A JPH0985263A JP H0985263 A JPH0985263 A JP H0985263A JP 25074495 A JP25074495 A JP 25074495A JP 25074495 A JP25074495 A JP 25074495A JP H0985263 A JPH0985263 A JP H0985263A
- Authority
- JP
- Japan
- Prior art keywords
- activated alumina
- desorbed
- soln
- phosphorus
- treated water
- 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
Landscapes
- Removal Of Specific Substances (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、下水２次処理水中
のリン酸イオンを活性アルミナにより吸着除去し、活性
アルミナに吸着したリン酸を酸性溶液或いはアルカリ性
溶液によって脱離させた際に生じる活性アルミナ脱離液
中のリン処理方法に関するものであり、特に、脱離液中
のリン酸イオンをリン酸マグネシウムアンモニウムの固
体粒子として回収する活性アルミナ脱離液中のリン処理
方法に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the activity produced when phosphate ions in secondary treated sewage water are adsorbed and removed by activated alumina, and the phosphoric acid adsorbed on activated alumina is desorbed by an acidic solution or an alkaline solution. The present invention relates to a phosphorus treatment method in an alumina desorption liquid, and more particularly to a phosphorus treatment method in an activated alumina desorption liquid for recovering phosphate ions in the desorption liquid as solid particles of magnesium ammonium phosphate.
【０００２】[0002]
【従来の技術】近年、閉鎖性水域で特に問題となってい
る富栄養化の一因子であるリンの除去技術にはアルミニ
ウム塩や鉄塩等の金属塩とリンを反応させる凝集分離
法、リン鉱石や骨炭等の種晶にヒドロキシアパタイトの
形でリンを析出させる晶析法（接触脱リン法）、微生物
のリン過剰摂取作用を利用した生物学的脱リン法、活性
アルミナ等の吸着剤に吸着除去する方法などがある。2. Description of the Related Art In recent years, phosphorus removal technology, which is one of the factors causing eutrophication, which has been a particular problem in closed water areas, has been developed by a coagulation separation method in which metal salts such as aluminum salts and iron salts are reacted with phosphorus. Crystallization method to deposit phosphorus in the form of hydroxyapatite on seed crystals such as ore and bone charcoal (catalytic dephosphorization method), biological dephosphorization method utilizing the excessive phosphorus intake of microorganisms, and adsorbents such as activated alumina There are methods such as adsorption removal.
【０００３】これらの中で、処理水中のリン濃度を低濃
度にまで低下でき、さらに廃棄物発生の少ない方法とし
て活性アルミナによる吸着除去法があるが、この方法に
おいては、活性アルミナの吸着能を維持するためには、
定期的なリンの脱離操作が必要になる。活性アルミナの
リン吸着能はｐＨ４〜７付近で最大を示し、その範囲外
では極端に低下する。そこで、酸性溶液或いはアルカリ
性溶液を用いて活性アルミナからのリン酸の脱離を行う
が、その際、高濃度のリン酸イオンを含有する脱離液が
発生し、その処分法が問題となっている。Among these, there is an adsorption removal method using activated alumina as a method capable of reducing the phosphorus concentration in the treated water to a low concentration and further reducing waste generation. In this method, the adsorption capacity of activated alumina is reduced. To maintain
Periodic desorption operation of phosphorus is required. The phosphorus adsorption capacity of the activated alumina shows the maximum around pH 4 to 7, and is extremely reduced outside the range. Therefore, desorption of phosphoric acid from activated alumina is performed using an acidic solution or an alkaline solution, but at that time, a desorption solution containing a high concentration of phosphate ions is generated, and its disposal method becomes a problem. There is.
【０００４】[0004]
【発明が解決しようとする課題】従来、活性アルミナの
脱離液中に塩化カルシウムや水酸化カルシウム等のカル
シウム化合物を添加することにより、リン酸カルシウ
ム、過リン酸石灰等の沈殿物として分離回収していた
が、沈殿反応には過剰のカルシウムが必要であり、生成
した沈殿はスラリー状であり、ハンドリングが困難であ
るという問題があった。そのため、この多量のスラリー
状汚泥を肥料として再利用する際にも、ハンドリングが
困難であり、肥料としての価値も低いという問題点があ
った。本発明は、活性アルミナ脱離液中のリン酸イオン
を効率よく除去することができ、さらに、リン酸イオン
をハンドリングが容易な固体粒子として回収して高品質
の化成肥料として有効利用できる活性アルミナ脱離液中
のリン処理方法を提供することを目的とするものであ
る。Conventionally, calcium compounds such as calcium chloride and calcium hydroxide are added to the desorbed liquid of activated alumina to separate and collect them as precipitates of calcium phosphate, lime superphosphate and the like. However, there is a problem that an excessive amount of calcium is required for the precipitation reaction, the formed precipitate is in a slurry state, and handling is difficult. Therefore, even when this large amount of slurry sludge is reused as a fertilizer, it is difficult to handle and the value as a fertilizer is low. INDUSTRIAL APPLICABILITY The present invention is capable of efficiently removing phosphate ions in the activated alumina desorption solution, and further, the phosphate ions can be effectively utilized as high-quality chemical fertilizers by collecting the phosphate ions as solid particles that can be easily handled. It is an object of the present invention to provide a method for treating phosphorus in a desorbed liquid.
【０００５】[0005]
【課題を解決するための手段】本発明者らは、このよう
な課題を解決するために鋭意検討の結果、活性アルミナ
脱離液を汚泥処理返流水と混合してマグネシウム化合物
を添加し、さらにｐＨを７．５以上１０以下に調整して
撹拌混合することにより、前記脱離液中のリン酸イオン
をリン酸マグネシウムアンモニウムの固体粒子として回
収して除去することができ、さらに、回収された固体粒
子は高品質の化成肥料として有効利用できるという事実
を見出し、本発明に到達した。すなわち、本発明は、下
水２次処理水を活性アルミナの充填層に供給して下水２
次処理水中のリン酸イオンを吸着除去し、次いで、酸性
溶液あるいはアルカリ性溶液によって活性アルミナに吸
着したリン酸を脱離させた際に生じる活性アルミナ脱離
液中のリン処理方法において、前記脱離液を汚泥処理返
流水と混合して〔ＮＨ4 + 〕／〔ＰＯ4 3- 〕が１以上と
なるようにするとともに、〔Ｍｇ2+〕／〔ＰＯ4 3- 〕が
１以上となるようにマグネシウム化合物を添加し、ｐＨ
を７．５以上１０以下に調整して撹拌混合することによ
り、前記脱離液中のリン酸イオンをリン酸マグネシウム
アンモニウムの固体粒子として回収して除去することを
特徴とする活性アルミナ脱離液中のリン処理方法を要旨
とするものである。Means for Solving the Problems As a result of earnest studies for solving the above problems, the present inventors have found that activated alumina desorption solution is mixed with sludge-treated return water to add a magnesium compound. By adjusting the pH to 7.5 or more and 10 or less and stirring and mixing, the phosphate ions in the desorbed liquid can be recovered and removed as solid particles of magnesium ammonium phosphate, and further recovered. The inventors have found the fact that solid particles can be effectively used as high-quality chemical fertilizers, and arrived at the present invention. That is, according to the present invention, the secondary treated water of sewage is supplied to the packed bed of activated alumina to obtain sewage 2
In the phosphorus treatment method in the activated alumina desorption liquid, which is generated when the phosphate ions in the subsequent treated water are adsorbed and removed, and then the phosphoric acid adsorbed on the activated alumina is desorbed by the acidic solution or the alkaline solution, Mix the liquid with the sludge treatment return water so that [NH 4 + ] / [PO 4 3- ] becomes 1 or more, and [Mg 2+ ] / [PO 4 3- ] becomes 1 or more. Add magnesium compound to pH
Is adjusted to 7.5 or more and 10 or less and mixed by stirring to recover and remove the phosphate ions in the desorbed liquid as solid particles of magnesium ammonium phosphate, the activated alumina desorbed liquid. The phosphorus processing method is the main point.
【０００６】[0006]
【発明の実施の形態】以下、図面を参照しつつ、本発明
を具体的に説明する。図１は、本発明の活性アルミナ脱
離液中のリン処理方法の一例を示す概略図である。図１
において、下水２次処理水１は活性アルミナ充填層３に
上向流又は下向流で空間速度（流量／吸着剤充填体積）
を１〜２０（１／ｈ）で供給される。そして、下水２次
処理水１中のリン酸イオンは活性アルミナ充填層３に吸
着され、リン酸イオンが除去された活性アルミナ吸着処
理水２が得られる。活性アルミナ充填層３に用いられる
吸着剤としては、Ａｌ2 Ｏ3 の含有率６０〜９０％、粒
子径が０．５〜５ｍｍ程度の市販品を用いることができ
る。吸着剤の市販品として、例えば、ネオビードＤやネ
オビードＤＳ−５（水澤化学工業社製）等があげられ
る。BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be specifically described below with reference to the drawings. FIG. 1 is a schematic view showing an example of a phosphorus treatment method in the activated alumina desorption liquid of the present invention. FIG.
In the sewage treatment, the secondary treated water 1 has a space velocity (flow rate / adsorbent filling volume) in the activated alumina packed bed 3 in an upward flow or a downward flow.
Is supplied at 1 to 20 (1 / h). Then, the phosphate ions in the secondary treated water 1 of the sewage are adsorbed by the activated alumina packed layer 3 to obtain the activated alumina adsorption treated water 2 from which the phosphate ions are removed. As the adsorbent used for the activated alumina filling layer 3, a commercially available product having an Al 2 O 3 content of 60 to 90% and a particle diameter of about 0.5 to 5 mm can be used. Examples of commercially available adsorbents include Neobead D and Neobead DS-5 (manufactured by Mizusawa Chemical Co., Ltd.).
【０００７】活性アルミナの吸着能を維持するために
は、充填体積の１００〜３０００倍程度の通水で、リン
酸の脱離操作が必要となる。活性アルミナに吸着したリ
ン酸を脱離させるためには、ｐＨ１以下の酸性溶液又は
ｐＨ９以上のアルカリ性溶液４を供給することが必要で
あるが、使用量及び吸着剤への影響を考慮すると、アル
カリ性溶液４を用いる方が好ましい。０．０１規定以
上、充填層体積の１〜５００倍程度のアルカリ性溶液４
を上向流又は下向流で供給することにより、活性アルミ
ナ充填層３に吸着したリン酸がほとんど脱離され、リン
酸が脱離した脱離液５のｐＨは１１〜１３、リン酸態リ
ン濃度は１００〜５０００ｍｇ／リットルと高濃度を示
す。In order to maintain the adsorptive capacity of activated alumina, it is necessary to desorb phosphoric acid by passing water about 100 to 3000 times the packed volume. In order to desorb the phosphoric acid adsorbed on the activated alumina, it is necessary to supply an acidic solution having a pH of 1 or less or an alkaline solution 4 having a pH of 9 or more, but considering the amount used and the influence on the adsorbent, the alkaline solution is used. It is preferable to use solution 4. Alkaline solution 4 of 0.01 normal or more and 1 to 500 times the volume of the packed bed
Is supplied in an upward flow or a downward flow, most of the phosphoric acid adsorbed on the activated alumina packed layer 3 is desorbed, and the pH of the desorbed liquid 5 from which the phosphoric acid is desorbed is 11 to 13, The phosphorus concentration is as high as 100 to 5000 mg / liter.
【０００８】このリン酸が脱離した脱離液５は脱離液貯
槽６を経て汚泥処理返流水７と混合される。このとき、
〔ＮＨ4 + 〕／〔ＰＯ4 3- 〕が１以上となるように混合
されることが必要であり、〔ＮＨ4 + 〕／〔ＰＯ4 3- 〕
が１以上１０以下となるように混合されることが好まし
い。ここで、汚泥処理返流水７とは、嫌気性消化処理を
行う汚泥処理系から水処理系へ返送される返送水のこと
をいう。脱離液５を汚泥処理返流水７と混合して後段の
造粒脱リン塔８に供給することにより、ＮＨ4 源だけを
別に添加するという必要がなくなり，汚泥処理返流水７
中のリン負荷も同時に軽減することができる。The desorbed liquid 5 from which the phosphoric acid is desorbed is mixed with the sludge treatment return water 7 through the desorbed liquid storage tank 6. At this time,
[NH 4 + ] / [PO 4 3− ] needs to be mixed so as to be 1 or more, and [NH 4 + ] / [PO 4 3− ]
Are preferably mixed so that the ratio is 1 or more and 10 or less. Here, the sludge treatment return water 7 refers to the return water returned from the sludge treatment system that performs anaerobic digestion treatment to the water treatment system. By mixing the desorbed liquid 5 with the sludge treatment return water 7 and supplying it to the granulation dephosphorization tower 8 in the subsequent stage, it is not necessary to separately add only the NH 4 source, and the sludge treatment return water 7
The phosphorus load inside can also be reduced at the same time.
【０００９】そして、造粒脱リン塔８での滞留時間が１
０分以上となるように、汚泥処理返流水７と混合された
脱離液５が造粒脱リン塔８に一定供給され、マグネシウ
ム化合物９が添加される。ここで、マグネシウム化合物
９は、〔Ｍｇ2+〕／〔ＰＯ4 3- 〕が１以上となるように
添加されることが必要であり、〔Ｍｇ2+〕／〔Ｐ
Ｏ4 3- 〕が１以上２以下となるように添加されることが
好ましい。用いられるマグネシウム化合物９としては、
特に限定されるものではないが、水酸化マグネシウム溶
液や塩化マグネシウム溶液を用いることが好ましい。The residence time in the granulation dephosphorization tower 8 is 1
The desorption liquid 5 mixed with the sludge treatment return water 7 is constantly supplied to the granulation dephosphorization tower 8 so as to be 0 minutes or more, and the magnesium compound 9 is added. Here, the magnesium compound 9 needs to be added so that [Mg 2+ ] / [PO 4 3− ] becomes 1 or more, and [Mg 2+ ] / [P
O 4 3− ] is preferably added so as to be 1 or more and 2 or less. As the magnesium compound 9 used,
Although not particularly limited, it is preferable to use a magnesium hydroxide solution or a magnesium chloride solution.
【００１０】さらに、造粒脱リン塔８内部でのｐＨを
７．５以上１０以下に調整することが必要であり、より
好ましくは，ｐＨ８以上９．５以下である。ｐＨが１０
以上を示す場合には、酸性溶液１０を添加し、ｐＨ１０
以下となるように調整する。酸性溶液１０としては、特
に限定されるものではないが、塩酸が好ましく用いられ
る。Further, it is necessary to adjust the pH inside the granulation dephosphorization tower 8 to 7.5 or more and 10 or less, and more preferably pH 8 or more and 9.5 or less. pH is 10
In the case of showing the above, the acidic solution 10 is added to adjust the pH to 10
Adjust as follows. The acidic solution 10 is not particularly limited, but hydrochloric acid is preferably used.
【００１１】造粒脱リン塔８の内部は常時撹拌混合する
ことが必要である。撹拌方法としては、撹拌翼により機
械的に撹拌してもよいが、所要動力、維持管理性の面か
ら、撹拌用空気１２を造粒脱リン塔８の底部より供給
し、撹拌することが好ましい。生成したリン酸マグネシ
ウムアンモニウムの固体粒子１３は、造粒脱リン塔８の
底部より１〜２週間の間隔で引き抜かれ、化成肥料とし
て有効利用される。脱離液５中のリン酸イオンが除去さ
れた処理水１１は造粒脱リン塔８上部より溢流する。こ
のようにして、活性アルミナ脱離液５中のリン酸イオン
の８０％以上を除去することができる。The inside of the granulation dephosphorization tower 8 needs to be constantly stirred and mixed. The stirring method may be mechanical stirring with a stirring blade, but from the viewpoint of required power and maintenance, stirring air 12 is preferably supplied from the bottom of the granulation dephosphorization tower 8 and stirred. . The produced magnesium ammonium phosphate solid particles 13 are withdrawn from the bottom of the granulation dephosphorization tower 8 at intervals of 1 to 2 weeks, and are effectively used as a chemical fertilizer. The treated water 11 from which phosphate ions in the desorbed liquid 5 have been removed overflows from the upper part of the granulation dephosphorization tower 8. In this way, 80% or more of phosphate ions in the activated alumina desorption solution 5 can be removed.
【００１２】図２は、本発明の活性アルミナ脱離液中の
リン処理方法を組み込んだ下水処理プロセスの一例を示
す概略図である。流入下水１４は、まず、最初沈殿池１
５に流入して固液分離された後、活性汚泥処理槽１６で
活性汚泥処理されて最終沈殿池１７に流入する。そし
て、この上澄水である下水二次処理水１は活性アルミナ
充填層３に供給され、下水２次処理水１中のリン酸イオ
ンが活性アルミナに吸着除去される。リン酸イオンが除
去された活性アルミナ吸着処理水２は活性アルミナ充填
層３より放流され、活性アルミナに吸着したリン酸を脱
離させるために、アルカリ性溶液４を活性アルミナ充填
層３に供給する。FIG. 2 is a schematic view showing an example of a sewage treatment process incorporating the method for treating phosphorus in the desorbed liquid of activated alumina of the present invention. The inflow sewage 14 is the first settling tank 1
After flowing into No. 5 for solid-liquid separation, activated sludge treatment is carried out in the activated sludge treatment tank 16 to flow into the final settling tank 17. Then, the sewage secondary treated water 1 which is the supernatant water is supplied to the activated alumina packed bed 3, and the phosphate ions in the sewage secondary treated water 1 are adsorbed and removed by the activated alumina. The activated alumina adsorption-treated water 2 from which the phosphate ions have been removed is discharged from the activated alumina packed layer 3, and an alkaline solution 4 is supplied to the activated alumina packed layer 3 in order to desorb the phosphoric acid adsorbed on the activated alumina.
【００１３】一方、最終沈殿池１７で沈殿した汚泥の一
部は、返送汚泥２０として活性汚泥処理槽１６に返送さ
れ、残りの汚泥２１は嫌気性消化槽１８を経て、脱水機
１９にて脱水され、ここで、汚泥処理返流水７と脱水ケ
ーキ２２とに分離される。そして、前記の脱離操作によ
りリン酸が脱離した脱離液５は汚泥処理返流水７と混合
されて、造粒脱リン塔８に供給される。ここで、マグネ
シウム化合物９を添加し、ｐＨ調整をして攪拌混合する
ことにより、脱離液５中のリン酸イオンがリン酸マグネ
シウムアンモニウムの固体粒子１３として回収され、リ
ン酸イオンが除去された造粒脱リン処理水１１は最初沈
殿池１５に返送される。On the other hand, a part of the sludge settled in the final settling tank 17 is returned to the activated sludge treatment tank 16 as a return sludge 20, and the remaining sludge 21 is dehydrated by a dehydrator 19 through an anaerobic digestion tank 18. It is then separated into the sludge treatment return water 7 and the dehydrated cake 22. Then, the desorbed liquid 5 from which phosphoric acid has been desorbed by the above desorption operation is mixed with the sludge treatment return water 7 and supplied to the granulation dephosphorization tower 8. Here, the magnesium compound 9 was added, the pH was adjusted, and the mixture was stirred and mixed, whereby the phosphate ions in the desorbed liquid 5 were recovered as solid particles of magnesium ammonium phosphate 13, and the phosphate ions were removed. The granulated dephosphorized water 11 is first returned to the settling tank 15.
【００１４】[0014]
【実施例】次に、本発明を実施例及び比較例によって具
体的に説明する。 実施例１ 直径３２ｍｍ、長さ４５０ｍｍのガラス製カラムに、活
性アルミナとしてネオビードＤ（Ａｌ2 Ｏ3 ８０．５７
％、粒度４〜５メッシュ９１．０％、水澤化学工業社
製）を吸着材層が４００ｍｍとなるように充填し、この
充填層にリン酸態リン濃度が１．５ｍｇ／リットルの都
市下水２次処理水を空間速度５（１／ｈ）で通水して処
理したところ、活性アルミナ充填体積の３０００倍の通
水まで、処理水のリン酸態リン濃度は０．５ｍｇ／リッ
トル以下に維持された。脱離操作として、充填層体積の
３倍量の１Ｎ水酸化ナトリウム溶液を活性アルミナ充填
層に添加し循環させることにより、活性アルミナに吸着
したリンの約９０％が脱離され、リン酸態リン濃度９０
０ｍｇ／リットル 、ｐＨ１３の脱離液が生成した。Next, the present invention will be described specifically with reference to examples and comparative examples. Example 1 A glass column having a diameter of 32 mm and a length of 450 mm was charged with neo-bead D (Al 2 O 3 80.57) as activated alumina.
%, Particle size 4-5 mesh 91.0%, manufactured by Mizusawa Chemical Industry Co., Ltd.) so that the adsorbent layer becomes 400 mm, and the packed layer has a phosphoric acid phosphorus concentration of 1.5 mg / liter When the treated water was treated by passing it through at a space velocity of 5 (1 / h), the phosphate concentration of the treated water was maintained at 0.5 mg / liter or less until it passed 3000 times the activated alumina filling volume. Was done. As a desorption operation, by adding 1N sodium hydroxide solution in an amount three times the volume of the packed bed to the packed bed of activated alumina and circulating it, about 90% of the phosphorus adsorbed on the activated alumina was desorbed, and the phosphoric acid Concentration 90
An eluent of 0 mg / liter, pH 13 was produced.
【００１５】この脱離液を嫌気性消化汚泥脱水ろ液（ア
ンモニア態窒素濃度４００ｍｇ／リットル、ｐＨ７．
５、リン酸態リン濃度１００ｍｇ／リットル）と〔ＮＨ
4 + 〕／〔ＰＯ4 3- 〕＝１となるように混合して造粒脱
リン塔に導入し、ここで、３５％水酸化マグネシウムを
〔Ｍｇ2+〕／〔ＰＯ4 3- 〕＝１となるように添加すると
ともに、１Ｎ塩酸でｐＨを９．５に調整した。撹拌混合
しながら、２０分間反応させることにより、脱離液中の
リン酸イオンは８０％以上除去され、沈降性の良いリン
酸マグネシウムアンモニウムの固体粒子が生成した。This desorbed liquid was used as an anaerobic digestion sludge dehydrated filtrate (ammonia nitrogen concentration 400 mg / liter, pH 7.
5, phosphoric acid phosphorus concentration 100 mg / liter) and [NH
4 + ] / [PO 4 3 − ] = 1 and mixed and introduced into the granulation dephosphorization tower, where 35% magnesium hydroxide [Mg 2+ ] / [PO 4 3 − ] = The pH was adjusted to 9.5 with 1N hydrochloric acid, while adding 1 to the above. By reacting for 20 minutes while stirring and mixing, 80% or more of the phosphate ions in the desorbed liquid were removed, and solid particles of magnesium ammonium phosphate having good sedimentation properties were generated.
【００１６】比較例１ 実施例１と同様にして得られた活性アルミナ脱離液に、
１Ｎ塩酸を添加してｐＨを１０に調整し、２Ｍの塩化カ
ルシウム溶液を〔Ｃａ2+〕／〔ＰＯ4 3- 〕＝３となるよ
うに添加した。実施例１と同様に脱離液中のリン酸イオ
ンは８０％以上除去されたが、非常に沈降性の悪いＣａ
2 （ＯＨ）ＰＯ4 と炭酸カルシウムのスラリー状汚泥が
多量に発生した。Comparative Example 1 An activated alumina desorption liquid obtained in the same manner as in Example 1 was
The pH was adjusted to 10 by adding 1N hydrochloric acid, and a 2M calcium chloride solution was added so that [Ca 2+ ] / [PO 4 3- ] = 3. As in Example 1, 80% or more of the phosphate ions in the desorbed liquid were removed, but Ca, which had a very poor sedimentation property, was used.
A large amount of slurry sludge of 2 (OH) PO 4 and calcium carbonate was generated.
【００１７】[0017]
【発明の効果】本発明においては、活性アルミナ脱離液
中のリン酸イオンを効率よく除去することができ、さら
に除去されたリン酸イオンはリン酸マグネシウムアンモ
ニウムの固体粒子として回収され、高品質の化成肥料と
して有効利用することができる。また、本発明において
は、活性アルミナ脱離液を汚泥処理返流水と混合して造
粒脱リン処理を行うため、ＮＨ4 源だけを別に添加する
という必要もなく、汚泥処理返流水中のリン負荷も同時
に軽減することが可能となる。INDUSTRIAL APPLICABILITY In the present invention, the phosphate ions in the activated alumina desorption solution can be efficiently removed, and the removed phosphate ions are recovered as solid particles of magnesium ammonium phosphate, which results in high quality. It can be effectively used as a chemical fertilizer. Further, in the present invention, since the activated alumina desorption liquid is mixed with the sludge-treated return water to perform the granulation dephosphorization treatment, it is not necessary to add only the NH 4 source separately, and the phosphorus in the sludge-treated return water is not required to be added. It is possible to reduce the load at the same time.
【図１】本発明の活性アルミナ脱離液中のリン処理方法
の一例を示す概略図である。FIG. 1 is a schematic view showing an example of a phosphorus treatment method in a desorbed solution of activated alumina of the present invention.
【図２】本発明の活性アルミナ脱離液中のリン処理方法
を組み込んだ下水処理プロセスの一例を示す概略図であ
る。FIG. 2 is a schematic view showing an example of a sewage treatment process incorporating the method for treating phosphorus in the desorbed liquid of activated alumina of the present invention.
１ 下水２次処理水 ２ 活性アルミナ吸着処理水 ３ 活性アルミナ充填層 ４ アルカリ性溶液 ５ 脱離液 ６ 脱離液貯槽 ７ 汚泥処理返流水 ８ 造粒脱リン塔 ９ マグネシウム化合物 10 酸性溶液 11 造粒脱リン処理水 12 攪拌用空気 13 リン酸マグネシウムアンモニウム固体粒子 1 Sewage Secondary treated water 2 Activated alumina adsorption treated water 3 Activated alumina packed bed 4 Alkaline solution 5 Desorbed liquid 6 Desorbed liquid storage tank 7 Sludge treatment return water 8 Granulation dephosphorization tower 9 Magnesium compound 10 Acidic solution 11 Granulation desorption Phosphorus treated water 12 Stirring air 13 Magnesium ammonium phosphate solid particles
Claims (1)
に供給して下水２次処理水中のリン酸イオンを吸着除去
し、次いで、酸性溶液あるいはアルカリ性溶液によって
活性アルミナに吸着したリン酸を脱離させた際に生じる
活性アルミナ脱離液中のリン処理方法において、前記脱
離液を汚泥処理返流水と混合して〔ＮＨ4 + 〕／〔ＰＯ
4 3- 〕が１以上となるようにするとともに、〔Ｍｇ2+〕
／〔ＰＯ4 3- 〕が１以上となるようにマグネシウム化合
物を添加し、ｐＨを７．５以上１０以下に調整して撹拌
混合することにより、前記脱離液中のリン酸イオンをリ
ン酸マグネシウムアンモニウムの固体粒子として回収し
て除去することを特徴とする活性アルミナ脱離液中のリ
ン処理方法。1. Secondary treated sewage water is supplied to a packed bed of activated alumina to adsorb and remove phosphate ions in the secondary treated sewage water, and then phosphoric acid adsorbed on the activated alumina by an acidic solution or an alkaline solution is removed. In the phosphorus treatment method in the activated alumina desorption liquid generated when desorbing, the desorption liquid is mixed with sludge treatment return water to [NH 4 + ] / [PO
4 3- ] becomes 1 or more, and [Mg 2+ ]
A magnesium compound is added so that / [PO 4 3− ] becomes 1 or more, the pH is adjusted to 7.5 or more and 10 or less, and the mixture is stirred and mixed, whereby the phosphate ion in the desorbed solution is converted into phosphoric acid. A method for treating phosphorus in a desorbed liquid of activated alumina, which comprises recovering and removing magnesium ammonium solid particles.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25074495A JPH0985263A (en) | 1995-09-28 | 1995-09-28 | Treatment of phosphorus in activated alumina desorbed solution |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25074495A JPH0985263A (en) | 1995-09-28 | 1995-09-28 | Treatment of phosphorus in activated alumina desorbed solution |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0985263A true JPH0985263A (en) | 1997-03-31 |
Family
ID=17212399
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP25074495A Pending JPH0985263A (en) | 1995-09-28 | 1995-09-28 | Treatment of phosphorus in activated alumina desorbed solution |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0985263A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000334472A (en) * | 1999-05-26 | 2000-12-05 | Kurita Water Ind Ltd | Treatment of waste water |
| JP2008183562A (en) * | 2008-05-02 | 2008-08-14 | Kurita Water Ind Ltd | Dephosphorization apparatus |
-
1995
- 1995-09-28 JP JP25074495A patent/JPH0985263A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000334472A (en) * | 1999-05-26 | 2000-12-05 | Kurita Water Ind Ltd | Treatment of waste water |
| JP2008183562A (en) * | 2008-05-02 | 2008-08-14 | Kurita Water Ind Ltd | Dephosphorization apparatus |
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