JPS6331593A - Removal of phosphate ion in water - Google Patents
Removal of phosphate ion in waterInfo
- Publication number
- JPS6331593A JPS6331593A JP17524586A JP17524586A JPS6331593A JP S6331593 A JPS6331593 A JP S6331593A JP 17524586 A JP17524586 A JP 17524586A JP 17524586 A JP17524586 A JP 17524586A JP S6331593 A JPS6331593 A JP S6331593A
- Authority
- JP
- Japan
- Prior art keywords
- water
- treated
- treated water
- crystallization
- tank
- 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
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 99
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 title claims abstract description 26
- 229940085991 phosphate ion Drugs 0.000 title abstract 4
- 238000000034 method Methods 0.000 claims abstract description 25
- BHPQYMZQTOCNFJ-UHFFFAOYSA-N Calcium cation Chemical compound [Ca+2] BHPQYMZQTOCNFJ-UHFFFAOYSA-N 0.000 claims abstract description 8
- 239000003513 alkali Substances 0.000 claims abstract description 8
- 229910001424 calcium ion Inorganic materials 0.000 claims abstract description 8
- 238000002425 crystallisation Methods 0.000 claims description 34
- 230000008025 crystallization Effects 0.000 claims description 34
- 210000000988 bone and bone Anatomy 0.000 claims description 7
- 238000010979 pH adjustment Methods 0.000 claims description 7
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 abstract description 8
- 229910052791 calcium Inorganic materials 0.000 abstract description 8
- 239000011575 calcium Substances 0.000 abstract description 8
- 229910052586 apatite Inorganic materials 0.000 abstract description 4
- VSIIXMUUUJUKCM-UHFFFAOYSA-D pentacalcium;fluoride;triphosphate Chemical compound [F-].[Ca+2].[Ca+2].[Ca+2].[Ca+2].[Ca+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O VSIIXMUUUJUKCM-UHFFFAOYSA-D 0.000 abstract description 4
- 238000001556 precipitation Methods 0.000 abstract description 3
- 239000003795 chemical substances by application Substances 0.000 abstract description 2
- 238000006243 chemical reaction Methods 0.000 description 8
- 230000007423 decrease Effects 0.000 description 8
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 6
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 239000011574 phosphorus Substances 0.000 description 5
- 229910052698 phosphorus Inorganic materials 0.000 description 5
- 230000003247 decreasing effect Effects 0.000 description 4
- 229910052588 hydroxylapatite Inorganic materials 0.000 description 4
- XYJRXVWERLGGKC-UHFFFAOYSA-D pentacalcium;hydroxide;triphosphate Chemical compound [OH-].[Ca+2].[Ca+2].[Ca+2].[Ca+2].[Ca+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O XYJRXVWERLGGKC-UHFFFAOYSA-D 0.000 description 4
- 229910000019 calcium carbonate Inorganic materials 0.000 description 3
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 3
- 239000000920 calcium hydroxide Substances 0.000 description 3
- 235000011116 calcium hydroxide Nutrition 0.000 description 3
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 3
- -1 hydroxide ions Chemical class 0.000 description 3
- 150000002500 ions Chemical class 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000004220 aggregation Methods 0.000 description 2
- 230000002776 aggregation Effects 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 2
- 230000015271 coagulation Effects 0.000 description 2
- 238000005345 coagulation Methods 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 2
- 239000013081 microcrystal Substances 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 239000010802 sludge Substances 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910019142 PO4 Inorganic materials 0.000 description 1
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 1
- 238000010009 beating Methods 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
- 238000009933 burial Methods 0.000 description 1
- 239000001506 calcium phosphate Substances 0.000 description 1
- 229910000389 calcium phosphate Inorganic materials 0.000 description 1
- 235000011010 calcium phosphates Nutrition 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 239000003599 detergent Substances 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000012851 eutrophication Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 210000003608 fece Anatomy 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 150000002903 organophosphorus compounds Chemical class 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 150000003013 phosphoric acid derivatives Chemical class 0.000 description 1
- 230000002250 progressing effect Effects 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- QORWJWZARLRLPR-UHFFFAOYSA-H tricalcium bis(phosphate) Chemical compound [Ca+2].[Ca+2].[Ca+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O QORWJWZARLRLPR-UHFFFAOYSA-H 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
- 238000004065 wastewater treatment Methods 0.000 description 1
Landscapes
- Removal Of Specific Substances (AREA)
Abstract
Description
【発明の詳細な説明】
（発明の目的）
（産業上の利用分野）
本発明は、水中のリン酸イオンを晶析によって除去する
水中リン酸イオンの除去方法に関する。DETAILED DESCRIPTION OF THE INVENTION (Objective of the Invention) (Industrial Application Field) The present invention relates to a method for removing phosphate ions in water by removing phosphate ions in water by crystallization.
（従来の技術）
一般に人体排泄物あるいは洗剤には有機リン化合物ある
いは無改性リン酸塩が様々の状態で存在しているが、こ
れらは下、廃水中に排出される場合が多く、しかも通常
の下、廃水処理工程では十分に除去されることなく大部
分が無別リン酸イオンとして水中に残存する。そしてこ
のリン酸イオンは閉鎖水域の富栄養化をもたらし、水質
を汚濁して公害発生の原因となるので、このリン酸イオ
ンを除去するための３次処理（高度処理）が必要とされ
る。(Prior art) Generally, organic phosphorus compounds or unmodified phosphates exist in various states in human excreta or detergents, but these are often discharged into wastewater, and moreover, they are usually Under these conditions, most of the phosphate ions remain in the water as free phosphate ions without being sufficiently removed in the wastewater treatment process. These phosphate ions cause eutrophication of closed water bodies, contaminate water quality, and cause pollution, so tertiary treatment (advanced treatment) is required to remove these phosphate ions.
従来、リン酸イオンの除去法としては金属塩あるいは消
石灰を用いた凝集沈殿法がよく知られている。これは水
中のリン酸イオンを金泥イオンあるいは消石灰と反応さ
せ難溶性塩を生成し、こ・れを沈殿分離する方法である
が、添加する薬品を多♀に必要とし、また発生する汚泥
の邑も多いため多額の処理費用を要する方法となってい
る。Conventionally, a coagulation precipitation method using metal salts or slaked lime is well known as a method for removing phosphate ions. This is a method of reacting phosphate ions in water with gold mud ions or slaked lime to produce poorly soluble salts, which are then separated by precipitation. This method requires a large amount of processing cost.
このような従来法の欠点を解消し、簡甲な操作で効率よ
く水中のリン酸イオンを除去するためにヒドロキシアパ
タイトの晶析用↑を利用したいわゆる晶析脱リン法が知
られている。A so-called crystallization dephosphorization method using ↑ for crystallization of hydroxyapatite is known in order to eliminate such drawbacks of the conventional method and efficiently remove phosphate ions from water with a simple operation.
この方法は被処理水にカルシウムイオン（Ｃａｚ＋）と
水酸イオン（ＯＨ−）を少吊加えることにより水中に溶
存するリン酸イオン（ＰＯ４３−）をヒドロキシアパタ
イト（Ｃａ５（ＰＯａ） ３０Ｈ）の微結晶として析出
させ、このヒドロ腓シアパタイトを含みかつ単なる沈降
では分離困難なコロイド状被処理水を品析材と直ちに接
触させることによりそのヒドロキシアパタイトの微結晶
を品析材に広く分布しているアパタイトの結晶に晶析さ
せリン酸イオンを順次除去しようとするものである。こ
の方法は多量の汚泥発生を伴わず９船の薬品添加で効率
よくリン酸イオンを除去できる有用な方法である。This method involves adding a small amount of calcium ions (Caz+) and hydroxide ions (OH-) to the water to be treated, thereby converting phosphate ions (PO43-) dissolved in the water into microcrystals of hydroxyapatite (Ca5(POa) 30H). By immediately contacting the colloidal treated water, which contains hydrothylsiapatite and is difficult to separate by mere sedimentation, with the specimen material, the microcrystals of hydroxyapatite are separated from the apatite widely distributed in the specimen material. The aim is to sequentially remove phosphate ions by crystallizing them into crystals. This method is a useful method that can efficiently remove phosphate ions by adding nine vessels of chemicals without generating a large amount of sludge.
（発明が解決しようとする問題点）
上述のような晶析脱リン法において脱リン性能に影響を
及ぼす因子は、ｐＨ、アルカリ度、カルシウムイオン濃
度、水温等がよく知られているが、水温を制御するには
多量のエネルギーを消費することになるため、脱リン性
能の制御には主にｐｌ＋、アルカリ度、カルシウムイオ
ン濃度が操伯囚子として利用されている。(Problems to be Solved by the Invention) Factors that affect dephosphorization performance in the crystallization dephosphorization method as described above are well known, such as pH, alkalinity, calcium ion concentration, and water temperature. Since a large amount of energy is consumed to control the dephosphorization performance, PL+, alkalinity, and calcium ion concentration are mainly used as control factors.
さて、従来脱リン性能を向上させるために被処理水のア
ルカリ度を何らかの方法で低下させて通水する方法が行
なわれているが、アパタイトの晶析反応は（１）式に示
すように、Ｏ１＋イオン消費する。Now, conventionally, in order to improve dephosphorization performance, a method has been used to lower the alkalinity of the water to be treated by some method before passing the water through the water, but the crystallization reaction of apatite is as shown in equation (1). Consumes O1+ ions.
５Ｃａ ２＋ ＋ ３ＰＯ４３−４叶−Ｃａ５（ＰＯ４
） ３叶・・・・・・（１）一方こうした晶析脱リン法
は通常ｐＨ９，０かそれ以下の操作条件で行なわれるが
、被処理水中のアルカリ度が低い場合、ｐｌ＋緩衝能力
が低いため、叶イオンの消費に伴い、急速にｐＨ低下が
生じる。5Ca 2+ + 3PO43-4 Kano-Ca5 (PO4
) 3. (1) On the other hand, such crystallization dephosphorization method is usually carried out under operating conditions of pH 9.0 or lower, but if the alkalinity of the water to be treated is low, the PL + buffering capacity is low. Therefore, as leaf ions are consumed, the pH rapidly decreases.
ところが、萌述したように、本反応はｐＨの影響を受け
るためｐＨ低下が生じると途中で反応が進行しなくなる
ため、充分な脱リン性能が得られなくなる。However, as mentioned above, this reaction is affected by pH, and if the pH decreases, the reaction will stop progressing, making it impossible to obtain sufficient dephosphorization performance.
骨炭を品析材に使用した場合、アルカリ分が骨炭中に存
在するため、通水初期はそれ程処理水のｐＨ低下は認め
られないが、アルカリ度の低い被処理水を長期に通水し
ていると徐々にｐＨ低下が進行し、それとともに処理水
のＰＯ４−ｐ ８１度の上昇が認められ、長期間安定し
た処理性能を得られないという問題があった。When bone char is used as a material for quality analysis, alkaline content exists in the bone char, so the pH of the treated water does not decrease significantly at the beginning of water flow, but if treated water with low alkalinity is passed for a long period of time, The pH gradually decreased, and at the same time, the PO4-p of the treated water increased by 81 degrees, causing the problem that stable treatment performance could not be obtained for a long period of time.
本発明は上述の問題に鑑みアルカリ度の低い被処理水に
おいて、処理水のｐＨの低下を防止し、骨炭を充填した
晶析層内全域を活性化することにより長期にわたり安定
した高度の脱リン性能を維持する方法を提供することを
目的とするものである。In view of the above-mentioned problems, the present invention prevents a drop in the pH of treated water with low alkalinity and activates the entire area within the crystallization layer filled with bone char, thereby achieving a stable and high degree of dephosphorization over a long period of time. The purpose is to provide a method to maintain performance.
（問題点を解決するための手段）
本発明は、リン酸イオンを含みかつアルカリ度が１００
■／１以下の被処理水にカルシウムイオンを加えるとと
もにアルカリにより被処理水のｐＨを８．５〜９．５に
調整した後、この被処理水を骨炭を充填した晶析層に通
水してリン酸イオンを除去した処理水とし、この処理水
の一部を返送して被処理水とともにｐｌ＋調整工程と晶
析層を循環させることにより’２！ｌＩ’Ｊ水のｐＨ低
下を防止し、晶析層内を活性化し処理水に残存するリン
酸イオンを除去するものである。(Means for Solving the Problems) The present invention contains phosphate ions and has an alkalinity of 100%.
■After adding calcium ions to the water to be treated with a pH of 1 or less and adjusting the pH of the water to 8.5 to 9.5 with an alkali, the water to be treated is passed through a crystallization bed filled with bone char. By removing phosphate ions from the treated water, a portion of this treated water is returned and circulated through the PL+ adjustment process and the crystallization layer together with the treated water. This prevents the pH of lI'J water from decreasing, activates the inside of the crystallization layer, and removes phosphate ions remaining in the treated water.
晶析反応は被処理水と晶析層との反応が１段処理よりも
２段処理の方が脱リン効果が大となるが、晶析層のみで
処理水を循環させると、晶析反応によってｐＨが低下し
、晶析層の晶析能力が低下する。In the crystallization reaction, the dephosphorization effect is greater in two-stage treatment than in one-stage reaction between the water to be treated and the crystallization layer, but when the treated water is circulated only through the crystallization layer, the crystallization reaction As a result, the pH decreases, and the crystallization ability of the crystallization layer decreases.
処理水の一部をｐｌ＋調整工程へ返送し被処理水ととも
にｐＨを調整して晶析層に通水することによりｐＨが低
下した処理水のｐｌ＋を再び８．５〜９．５に調整し、
晶析層におけるアパタイトの晶析を促進させることがで
きるゆ
本発明におけるカルシウムイオンの添加０は被処理水中
に含まれるカルシウムの原子数比が３対５の割合よりも
多くなるようにする。A part of the treated water is returned to the PL+ adjustment process, the pH is adjusted together with the water to be treated, and the PL+ of the treated water whose pH has decreased is adjusted again to 8.5 to 9.5 by passing the water through the crystallization layer. ,
The addition of calcium ions in the present invention, which can promote the crystallization of apatite in the crystallization layer, is such that the atomic ratio of calcium contained in the water to be treated is greater than 3:5.
これは（１）式にも示したように晶析が進行するとリン
の除去と同時にカルシウムの除去が生じるためで、高度
にリンが除去されても最終の処理水中に４０η／１以上
のカルシウムイオンを存在させることにより晶析層全体
での効率の低下を防止することができる。This is because, as shown in equation (1), as crystallization progresses, calcium is removed at the same time as phosphorus is removed. By allowing the presence of , it is possible to prevent a decrease in efficiency in the entire crystallization layer.
また被処理水をアルカリでｐＨ８，５〜９５にコントロ
ールすることは（１）式にも示したようにカルシウムイ
オンと同様に水酸イオンが晶析反応を進行させるうえで
重要な因子となっているためであるが、従来の方法では
９．０以下の値が採用されている。これは９０以上にす
ると炭酸カルシウムが生成しやすくなり、晶析層中のヒ
ドロキシアパタイト表面を′Ｆｌｉ覆して脱リン性能を
悪化させる恐れがあることと、凝集によるリンの除去が
生じ、リン酸カルシウムの汚泥が発生するためである。In addition, controlling the pH of the water to be treated with an alkali to 8.5 to 95 means that hydroxide ions, like calcium ions, are an important factor in promoting the crystallization reaction, as shown in equation (1). However, in the conventional method, a value of 9.0 or less is adopted. If the value is 90 or more, calcium carbonate is likely to be generated, which may cover the hydroxyapatite surface in the crystallized layer and worsen the dephosphorization performance. This is because
しかし、被処理水中のアルカリ度が１１００ｆＩｒ＃！
以下の場合、炭酸カルシウムの生成傾向は弱まり、ｐ＋
＋は９０以上にできる。またリンの凝集に関しては、リ
ン酸イオンが殆んど除去された処理水の一部を０１１調
整工程に返送して被処理水とともに循環することにより
ｐＨ調整工程でのリン濃度が低下し、ｐＨを９．０以上
にしてもリンの凝集は生じにくい。However, the alkalinity in the water to be treated is 1100fIr#!
In the following cases, the tendency to form calcium carbonate is weakened and p+
+ can be 90 or more. Regarding phosphorus aggregation, a part of the treated water from which most of the phosphate ions have been removed is returned to the 011 adjustment process and circulated together with the water to be treated, thereby reducing the phosphorus concentration in the pH adjustment process and increasing the pH. Even if it is set to 9.0 or more, phosphorus aggregation is unlikely to occur.
上述のような理由からアルカリ度の１００ｍ’Ｊ ／
ｆ以下の被処理水の場合処理水を循環して被処理水と混
合しｐＨを８．５〜９５に調整することにより処理水ｐ
Ｈの低下を防止し晶析層仝休での脱リン性能を高めるこ
とができる。またこのとき炭酸カルシウムの生成による
骨炭の品析刊能低下もなく凝集によるリン酸カルシウム
汚泥の生成もないため長期間安定した脱リン性能を発圧
させることがでさろ。For the reasons mentioned above, the alkalinity of 100 m'J/
In the case of treated water with pH below f, the treated water is circulated and mixed with the treated water to adjust the pH to 8.5 to 95.
It is possible to prevent a decrease in H and improve the dephosphorization performance during the crystallization layer suspension. In addition, at this time, there is no deterioration in the quality analysis ability of bone char due to the production of calcium carbonate, and no calcium phosphate sludge is produced due to coagulation, so it is possible to maintain stable dephosphorization performance over a long period of time.
また処理水の一部をｐｌ＋調整［程に返送して循環する
ことにより１ｖｒ述した効果とあり「、波９Ｕ理水と晶
析層の接触回数が増加することにより高い脱リン性能を
維持することができる。In addition, by returning a portion of the treated water to PL+ adjustment and circulating it, the effect described above can be achieved by increasing the number of contacts between the wave 9U water and the crystallization layer, thereby maintaining high dephosphorization performance. be able to.
また返送される処理水の返送置部らｐ＋＋調整Ｉ［程と
晶析層を１２ｉ環する循環水量は、処理水の流出組部ち
被処理水の流入最の０５倍〜３倍が適当である。In addition, it is appropriate that the amount of circulating water that circulates through the return section of the treated water and the crystallization layer should be 05 to 3 times the maximum amount of water that flows into the outflow section of the treated water and the inflow of the treated water. be.
処理水の返送量が処理水の流出口の０．５（”以下にな
ると、処理水の循環による前述の２つの効果（ｐｌ＋の
低下防止と晶析層との接触回数の増加）が小さく、処理
成績として認められなくなり循環しない場合と同程度の
処理水となってしまう。When the amount of treated water returned is less than 0.5" at the outlet of the treated water, the two effects mentioned above (preventing a drop in PL+ and increasing the number of contacts with the crystallization layer) due to circulation of the treated water are small. The treated water will not be recognized as a treatment result, and the treated water will be at the same level as if it were not circulated.
また処理水の返送量が処理水の流出］の３倍以上になる
と、今度は処理水の循環による前ｊ出の２つの効果が０
．５〜３倍の場合と差が小さくなり、脱リン性能が低下
づるということはないが、処理成績に大きな寄与がなく
循環水量を増やす分だけ余分なエネルギーを消費するこ
とになる。In addition, if the amount of returned treated water becomes three times or more than the amount of treated water flowing out, the two effects mentioned above due to the circulation of treated water will become zero.
．． The difference is smaller than in the case of 5 to 3 times, and the dephosphorization performance does not deteriorate, but it does not contribute much to the treatment results and extra energy is consumed by increasing the amount of circulating water.
以上の叩出により処理水の循環水量は流入水１１の０５
〜３ ＋８が適当となる。Due to the above-mentioned beating, the amount of circulating water for treated water is 05 of inflow water 11
~3+8 is appropriate.
次に本発明の実施態様を第１図について説明する。被処
理水は原水流入管１を通じて、ｐＨ調整槽２に導入され
る。ｐＨ調！２漕２は撹ｆｆ ＩＩ ３によって８合さ
れており、ｐＨ電電性４よってｐｔＥ整槽整向２内Ｈが
測定され、調整シ１４ａにその信号が送られる。調整３
１４ａは１）１１調整槽２内が一定ｐＨになるようにア
ルカリ流入管５を通じてｐｌ＋調整（ｎ２内にアルカリ
を導入させる。また、必要に応じてカルシウム剤がカル
シウム流入管６を通じてｐＨ調整槽２内に゛」７人され
ろ。このようにしてカルシウムか添加され、ｐＨを調整
された被処理水はｎＨ調整（告２から流出管７を通じて
η出され、脱リン槽８の上部に）、・７人される。被処
理水は説リン槽８を下向流で通過する間に被処理水中の
リン酸イオンは脱リン槽８の骨炭を充填した固定床より
なる晶析層９に１ｇ触してアバタイ１−とじで晶析除去
され、処理水流出管１０を通じて導出されろ。処理水の
一部は処理水流出管１０に接続された循環水管１１を通
じて循環ポンプ１２によりｐＨ調整冶２に返送されて循
環ツる。Next, an embodiment of the present invention will be described with reference to FIG. The water to be treated is introduced into a pH adjustment tank 2 through a raw water inflow pipe 1 . pH tone! The two tanks 2 are mixed together by the stirrer ff II 3, and the H inside the ptE tank alignment 2 is measured by the pH conductivity 4, and the signal is sent to the adjustment switch 14a. Adjustment 3
14a is 1) pl+ adjustment (introducing alkali into n2 through the alkali inflow pipe 5) so that the inside of the adjustment tank 2 has a constant pH.Also, if necessary, a calcium agent is added to the pH adjustment tank 2 through the calcium inflow pipe 6. In this way, calcium is added and the pH of the water to be treated is adjusted to nH (it is discharged from the tank 2 through the outflow pipe 7 and placed in the upper part of the dephosphorization tank 8). - 7 people are treated.While the water to be treated passes through the phosphorus tank 8 in a downward flow, 1g of phosphate ions in the water to be treated are transferred to the crystallization layer 9, which is a fixed bed filled with bone char, in the dephosphorization tank 8. The treated water is crystallized and removed by the abutment 1 and then led out through the treated water outflow pipe 10. A part of the treated water is passed through the circulating water pipe 11 connected to the treated water outflow pipe 10 and sent to the pH adjustment tank 2 by the circulation pump 12. It will be sent back and circulated.
（実施例）
直径５０ ｍｍ 、高さ２０００ ｔｎｍのアクリルカ
ラムに晶析層として粒径００５〜１．０ｍｍ１．：″Ａ
整した骨炭（Ｊでに６ケ月脱リン実験を行なっていたも
の）を２ｆ！、充填した。別にｐｌ＋調整槽を設け、ｉ
ｆ”ｉ Ｆ灰によって１）１１９．２にコン１へ［Ｉ−
ルした。消石灰を開用したの【まアルカリの添加とカル
シウムの添加を同時に１７なうためである。戒灰埋水の
流量は９６１／日で、ｐＨ調整漕の流出水を前記カラム
に下向流で通して晶析（を通過させ処理水は一部をｐＨ
調整槽に返送して循Ｉ潰した。循環水量は９６り７日と
した。(Example) An acrylic column with a diameter of 50 mm and a height of 2000 tnm was coated with a particle size of 0.05 to 1.0 mm as a crystallization layer. ：″A
2F of prepared bone charcoal (which was subjected to 6 months of dephosphorization experiment at J)! , filled. A separate pl + adjustment tank is provided, i
f”i by F Ash 1) to Con 1 at 119.2 [I-
I did it. The reason why slaked lime was used was to add alkali and calcium at the same time. The flow rate of the ash burial water is 961/day, and the effluent from the pH adjustment tank is passed through the column in a downward flow for crystallization.
It was returned to the adjustment tank and crushed. The amount of circulating water was 96 days and 7 days.
その結果を第２図に示す。彼処理水のアルカリ度３０〜
４０Ｒｇ／ ｊ！ 、 ＰＯ４−Ｐ ３．５〜４．２
Ｒ’ｌ／１で、処理水ＰＯ４−ｐは最初的０．９■／ｌ
であったが、徐々に低下し、約０．３Ｒ’ｌ／１となっ
た。The results are shown in FIG. Alkalinity of treated water is 30~
40Rg/j! , PO4-P 3.5-4.2
At R'l/1, the treated water PO4-p is initially 0.9■/l
However, it gradually decreased to about 0.3 R'l/1.
ｐＨは ８．０力＼ら ８４に」−臂した。The pH was 8.0 to 84.
比較例１
処理水の循環を行なわず、それ以外の条件はすべて実流
例と同様に行なった。Comparative Example 1 The treated water was not circulated, and all other conditions were the same as in the actual flow example.
結果は第２図に示すように最初処理水
ｐｏ４− ｐは約１．０■／１だったものが徐々に増加
し、約１．４η／１になった。ｐＨは、８．０から ７
７に低下している。As shown in Fig. 2, the po4-p of the treated water was initially about 1.0 η/1, but gradually increased to about 1.4η/1. pH is 8.0 to 7
It has fallen to 7.
比較例２
処理水の一部をｐＨ調整槽に返送せずカラムの手前（第
１図の流出管７）に返送して循環させ、それ以外の条件
はすべて実施例と同様に行なった。Comparative Example 2 A portion of the treated water was not returned to the pH adjustment tank, but was returned to the front of the column (outflow pipe 7 in FIG. 1) and circulated, and all other conditions were the same as in Examples.
結果は第２図に示すように、処理水の
ｐｏ４− ｐは最初的１０η／１であったが、８５日後
、約０．８η／１となったものの実施例の結果にははる
かに及ばない。As shown in Figure 2, the po4-p of the treated water was initially 10η/1, but after 85 days it was about 0.8η/1, which was far below the results of the example. .
（発明の効果）
本発明によれば、処理水ｐｌ＋の低下が復元され晶析層
との晶析反応が促進されるから、長期間安定した高い脱
リン性能を保持させることができる。(Effects of the Invention) According to the present invention, since the decrease in treated water pl+ is restored and the crystallization reaction with the crystallization layer is promoted, stable and high dephosphorization performance can be maintained for a long period of time.
第１図は本発明の方法の一実施例を示す二［稈説明図、
第２図は処理水のＰＯ４−Ｐ並にｐＨの杼口変化を示す
図表である。
９・・晶析層。FIG. 1 shows an embodiment of the method of the present invention.
FIG. 2 is a chart showing changes in PO4-P and pH of the treated water. 9...Crystallization layer.
Claims (2)
／ｌ以下の被処理水にカルシウムイオンを加えるととも
にアルカリにより被処理水のｐＨを８．５〜９．５に調
整した後、この被処理水を骨炭を充填した晶析層に通水
してリン酸イオンを除去した処理水とし、この処理水の
一部を返送して被処理水とともにｐＨ調整工程と晶析層
を循環させ処理水に残存したリン酸イオンをさらに除去
することを特徴とする水中リン酸イオンの除去方法。(1) Contains phosphate ions and has an alkalinity of 100mg
After adding calcium ions to the water to be treated of less than /l and adjusting the pH of the water to be treated to 8.5 to 9.5 with an alkali, the water to be treated is passed through a crystallization bed filled with bone char. The process is characterized in that the treated water is treated with phosphate ions removed, and a part of this treated water is returned and circulated together with the water to be treated through a pH adjustment process and a crystallization layer to further remove the phosphate ions remaining in the treated water. How to remove phosphate ions in water.
０．５倍〜３倍であることを特徴とする特許請求の範囲
第１項記載の水中リン酸イオンの除去方法。(2) The method for removing phosphate ions in water according to claim 1, wherein the amount of returned treated water is 0.5 to 3 times the amount of outflowed treated water.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17524586A JPS6331593A (en) | 1986-07-25 | 1986-07-25 | Removal of phosphate ion in water |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17524586A JPS6331593A (en) | 1986-07-25 | 1986-07-25 | Removal of phosphate ion in water |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6331593A true JPS6331593A (en) | 1988-02-10 |
Family
ID=15992797
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP17524586A Pending JPS6331593A (en) | 1986-07-25 | 1986-07-25 | Removal of phosphate ion in water |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6331593A (en) |
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|---|---|---|---|---|
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| US6203888B1 (en) | 1996-02-15 | 2001-03-20 | Canon Kabushiki Kaisha | Ink-jet printing cloth, ink-jet printing process and print |
| JP2005246249A (en) * | 2004-03-04 | 2005-09-15 | Ebara Corp | Method for recovering phosphorus and its apparatus |
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| JP2013184110A (en) * | 2012-03-07 | 2013-09-19 | Mitsui Zosen Environment Engineering Corp | Device for recovering phosphorus from phosphorus-containing water |
| JP2016002543A (en) * | 2014-06-19 | 2016-01-12 | 水ｉｎｇ株式会社 | Phosphorus recovery apparatus and method |
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-
1986
- 1986-07-25 JP JP17524586A patent/JPS6331593A/en active Pending
Cited By (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02258284A (en) * | 1989-03-03 | 1990-10-19 | Fuji Xerox Co Ltd | Ink recording method |
| US5976673A (en) * | 1996-02-15 | 1999-11-02 | Canon Kabushiki Kaisha | Ink-jet printing cloth, ink-jet printing process and print |
| US6203888B1 (en) | 1996-02-15 | 2001-03-20 | Canon Kabushiki Kaisha | Ink-jet printing cloth, ink-jet printing process and print |
| JP2005246249A (en) * | 2004-03-04 | 2005-09-15 | Ebara Corp | Method for recovering phosphorus and its apparatus |
| JP4519485B2 (en) * | 2004-03-04 | 2010-08-04 | 荏原エンジニアリングサービス株式会社 | Phosphorus recovery method and apparatus |
| US7954921B2 (en) | 2004-05-30 | 2011-06-07 | Kornit Digital Technologies Ltd. | Digital printing apparatus |
| US11447648B2 (en) | 2004-05-30 | 2022-09-20 | Kornit Digital Ltd. | Process and system for printing images on absorptive surfaces |
| US9550374B1 (en) | 2007-06-27 | 2017-01-24 | Cafepress Inc. | System and method for improved digital printing on textiles |
| US9611401B2 (en) | 2009-08-10 | 2017-04-04 | Kornit Digital Ltd. | Inkjet compositions and processes for stretchable substrates |
| US10472533B2 (en) | 2009-08-10 | 2019-11-12 | Kornit Digital Ltd. | Inkjet compositions and processes for stretchable substrates |
| US11021627B2 (en) | 2009-08-10 | 2021-06-01 | Kornit Digital Ltd. | Inkjet compositions and processes for stretchable substrates |
| US11898048B2 (en) | 2009-08-10 | 2024-02-13 | Kornit Digital Ltd. | Inkjet compositions and processes for stretchable substrates |
| US9616683B2 (en) | 2010-08-10 | 2017-04-11 | Kornit Digital Ltd. | Formaldehyde-free inkjet compositions and processes |
| JP2013184110A (en) * | 2012-03-07 | 2013-09-19 | Mitsui Zosen Environment Engineering Corp | Device for recovering phosphorus from phosphorus-containing water |
| JP2016002543A (en) * | 2014-06-19 | 2016-01-12 | 水ｉｎｇ株式会社 | Phosphorus recovery apparatus and method |
| US11098214B2 (en) | 2016-10-31 | 2021-08-24 | Kornit Digital Ltd. | Dye-sublimation inkjet printing for textile |
| US11629265B2 (en) | 2017-10-22 | 2023-04-18 | Kornit Digital Ltd. | Low-friction images by inkjet printing |
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