JPH08182993A - Dephosphorizing material and dephosphorization using the same - Google Patents
Dephosphorizing material and dephosphorization using the sameInfo
- Publication number
- JPH08182993A JPH08182993A JP34110494A JP34110494A JPH08182993A JP H08182993 A JPH08182993 A JP H08182993A JP 34110494 A JP34110494 A JP 34110494A JP 34110494 A JP34110494 A JP 34110494A JP H08182993 A JPH08182993 A JP H08182993A
- Authority
- JP
- Japan
- Prior art keywords
- phosphorus
- silicate hydrate
- calcium silicate
- sewage
- dephosphorization
- 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.)
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Links
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- Removal Of Specific Substances (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、特定の成分から構成さ
れる汚水処理用の脱リン材及びそれを利用する汚水の脱
リン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 a dephosphorizing material for treating sewage composed of specific components and a method for dephosphorizing sewage using the same.
【０００２】[0002]
【従来の技術及び発明が解決しようとする課題】従来か
ら、汚水の脱リン材として、珪酸カルシウム水和物が公
知である（特公平２−２０３１５号公報）。この脱リン
材は、脱リン材として相当優れた効果を発揮している
が、汚水中のオルトリン酸イオン濃度が低くなるにつれ
て、珪酸カルシウム水和物とオルトリン酸イオンの反応
が遅くなり、その結果、単位時間当りのリンの除去量が
低下するという問題があった。本発明の課題は、汚水中
のオルトリン酸イオンの濃度が低くてもリンの除去率を
向上させ得る汚水処理用脱リン材及び汚水の脱リン方法
を提供することにある。2. Description of the Related Art Calcium silicate hydrate has been conventionally known as a dephosphorizing agent for wastewater (Japanese Patent Publication No. 2-20315). This dephosphorizing agent exerts a considerably excellent effect as a dephosphorizing agent, but as the concentration of orthophosphate ions in wastewater decreases, the reaction between calcium silicate hydrate and orthophosphate ions slows down, and as a result, However, there is a problem that the amount of phosphorus removed per unit time decreases. An object of the present invention is to provide a dephosphorizing agent for treating sewage and a method for dephosphorizing sewage, which can improve the phosphorus removal rate even if the concentration of orthophosphate ions in the sewage is low.
【０００３】[0003]
【課題を解決するための手段】本請求項１の発明は、前
記の課題を解決するために、少なくとも難水溶性のリン
酸カルシウム化合物と珪酸カルシウム水和物とを含有す
る脱リン材とする。本請求項５の発明は、まずオルトリ
ン酸塩含有汚水を珪酸カルシウム水和物の充填層を通し
て浄化処理した後、その浄化処理された処理水を、難水
溶性のリン酸カルシウム化合物と珪酸カルシウム水和物
とを含有する脱リン材が充填させた充填層に通すという
手段を採用する。In order to solve the above problems, the invention of claim 1 provides a dephosphorization material containing at least a sparingly water-soluble calcium phosphate compound and a calcium silicate hydrate. According to the invention of claim 5, first, the orthophosphate-containing wastewater is purified through a packed bed of calcium silicate hydrate, and then the purified treated water is treated with a sparingly water-soluble calcium phosphate compound and calcium silicate hydrate. The means for passing through the packed bed filled with the dephosphorizing material containing and is adopted.
【０００４】[0004]
【作用】請求項１の発明の脱リン材においては、まず、
その脱リン材中の珪酸カルシウム水和物のカルシウムが
汚水に徐々に溶出する。そして前記カルシウムイオンが
汚水中のオルトリン酸イオンと反応して脱リン材表面に
難水溶性のリン酸カルシウム化合物として晶析する。し
かしながら、この反応系の中にはまだ種結晶の存在しな
い状態下での反応であるためカルシウムイオンとオルト
リン酸イオンとの反応はゆっくり進む。In the dephosphorization material of the invention of claim 1, first,
The calcium silicate hydrate calcium in the dephosphorized material is gradually eluted into the wastewater. Then, the calcium ions react with orthophosphate ions in the waste water to crystallize on the surface of the dephosphorization material as a sparingly water-soluble calcium phosphate compound. However, the reaction between calcium ion and orthophosphate ion proceeds slowly because the reaction is carried out in the state where seed crystals are not present in this reaction system.
【０００５】しかしながら、この反応系に難水溶性のリ
ン酸カルシウム化合物とともに脱リン材が存在するの
で、この難水溶性のリン酸カルシウム化合物が種結晶の
働きをし、この結晶の上に前記カルシウムイオンとオル
トリン酸イオンとが反応した難水溶性のリン酸カルシウ
ムが本発明の脱リン材の表面で晶析する。従って、汚水
中のオルトリン酸塩の濃度が低くてもリンの除去が従来
技術より促進される。However, since the dephosphorizing agent is present in this reaction system together with the sparingly water-soluble calcium phosphate compound, the sparingly water-soluble calcium phosphate compound acts as a seed crystal, and the calcium ion and the orthophosphoric acid are formed on the crystal. The sparingly water-soluble calcium phosphate that has reacted with ions crystallizes on the surface of the dephosphorizing material of the present invention. Therefore, even if the concentration of orthophosphate in the wastewater is low, the removal of phosphorus is promoted as compared with the prior art.
【０００６】請求項５の発明においては前段の反応過程
で、オルトリン酸塩を含有する汚水が予め珪酸カルシウ
ム水和物が充填されている層に通されるので、そのと
き、珪酸カルシウム水和物から溶出したカルシウムイオ
ンがオルトリン酸イオンと反応し、珪酸カルシウム水和
物の表面に難水溶性リン酸カルシウム化合物として晶析
するが、一部過飽和状態で溶存する。次に汚水が後段の
過程で供給されるので、過飽和状態で溶存する難水溶性
のリン酸カルシウム化合物と本発明に係る脱リン材から
さらに溶出してくるカルシウムイオンと汚水中に残存す
るオルトリン酸イオンとの反応物が本発明の脱リン材の
表面に析出する。要するに、前段の過程で析出が不十分
である難水溶性リン酸イオンカルシウム化合物を前段の
過程で過剰に溶出したカルシウムイオンと本発明の脱リ
ン材から溶出するカルシウムイオンを利用して予め生成
している難水溶性リン酸カルシウム化合物の結晶の上に
晶析させる。ちなみに、重炭酸イオンを含む汚水の場
合、重炭酸イオンのほとんどは前段の珪酸カルシウム水
和物に炭酸カルシウムとして沈着し、後段での晶析反応
を妨害しにくくなる。[0006] In the invention of claim 5, in the reaction process of the first stage, since the orthophosphate-containing wastewater is passed through the layer previously filled with calcium silicate hydrate, at that time, calcium silicate hydrate Calcium ions eluted from the above react with orthophosphate ions and crystallize on the surface of the calcium silicate hydrate as a sparingly water-soluble calcium phosphate compound, but they are partially dissolved in a supersaturated state. Next, since sewage is supplied in the latter stage process, a sparingly water-soluble calcium phosphate compound dissolved in a supersaturated state, calcium ions further eluted from the dephosphorization material according to the present invention, and orthophosphate ion remaining in sewage The reaction product of 1) is deposited on the surface of the dephosphorization material of the present invention. In short, a poorly water-soluble calcium phosphate phosphate compound that is insufficiently precipitated in the first step is preliminarily produced using calcium ions eluted in excess in the first step and calcium ions eluted from the dephosphorization material of the present invention. Crystallization is performed on the crystals of the poorly water-soluble calcium phosphate compound. By the way, in the case of sewage containing bicarbonate ions, most of the bicarbonate ions are deposited as calcium carbonate on the calcium silicate hydrate in the former stage, and it becomes difficult to interfere with the crystallization reaction in the latter stage.
【０００７】[0007]
【実施例１及び２、並びに比較実験１及び２】 （脱リン材の製造）リン酸溶液を消石灰で凝集沈澱処理
した後、その処理物が脱水処理された、いわゆる石灰処
理汚泥を、この実施例の脱リン材のリン酸質原料として
準備した。この石灰処理汚泥は、水分を６６重量％含有
しているとともに、主成分としてＣａＨＰＯ４・２Ｈ２
Ｏ（ブラッシャイト）を、そして副成分として炭酸カル
シウムをそれぞれ含んでいた。また、この石灰処理汚泥
は乾燥ベースで１８．５重量％のリンを含有していた。
さらに、この汚泥を１００重量部の水に１重量部を溶解
させると、６．９のｐＨ値を示し、０．５９％のオルト
リン酸態リンを溶出した。[Examples 1 and 2 and Comparative Experiments 1 and 2] (Production of dephosphorization material) A so-called lime-treated sludge obtained by subjecting a phosphoric acid solution to a coagulation-precipitation treatment with slaked lime and then dehydrating the treated product was carried out. It was prepared as a phosphate material for the example dephosphorization material. This lime-treated sludge contains 66% by weight of water and contains CaHPO 4 .2H 2 as a main component.
It contained O (brushite) and calcium carbonate as an accessory ingredient. The lime-treated sludge contained 18.5% by weight of phosphorus on a dry basis.
Furthermore, when 1 part by weight of this sludge was dissolved in 100 parts by weight of water, a pH value of 6.9 was exhibited and 0.59% of orthophosphoric acid-state phosphorus was eluted.
【０００８】この実施例の脱リン材の他の構成成分であ
る珪酸カルシウム水和物として、周知の方法で製造した
高温高圧蒸気養生された含水率３０重量％の軽量気泡コ
ンクリートを破砕することによって準備した。さらに、
早強セメント、フライアッシュ粉末及び前記軽量気泡コ
ンクリート製造過程の途中に副生する軽量気泡コンクリ
ート未養生物（以下、単に未養生物という）をそれぞれ
準備した。As a calcium silicate hydrate, which is another constituent of the dephosphorization material of this example, a lightweight cellular concrete with a water content of 30% by weight, which has been cured by high temperature and high pressure steam by a known method, is crushed. Got ready. further,
Early-strength cement, fly ash powder, and lightweight cellular concrete uncultivated organisms (hereinafter simply referred to as uncultivated organisms) that were by-produced during the above-described lightweight cellular concrete production process were prepared.
【０００９】前記各種の原料、すなわち石灰処理汚泥：
珪酸カルシウム水和物：セメント：フライアッシュ：未
養生物を１０：４０：４：４：４２の重量割合で混合し
て、得られた混合物は、表面積を大きくして蒸気養生し
易くするために加圧プレス機で外径８０ｍｍ、内径３０
ｍｍ、及び高さ８０ｍｍのラッシヒリング状に成形され
た。得られた成形物をオートクレーブ中で１．０ＭＰａ
×１８０℃の条件下で蒸気養生して、この実施例の脱リ
ン材を製造した。The above various raw materials, that is, lime-treated sludge:
Calcium silicate hydrate: cement: fly ash: uncultivated organisms were mixed in a weight ratio of 10: 40: 4: 4: 42, and the resulting mixture had a large surface area to facilitate steam curing. 80 mm outside diameter, 30 inside diameter with pressure press
It was formed into a Raschig ring having a size of 80 mm and a height of 80 mm. 1.0 MPa of the obtained molded product in an autoclave
The dephosphorization material of this example was manufactured by steam curing under the condition of 180 ° C.
【００１０】（人工汚水）Ｋ２ＨＰＯ４及びＫＨ２ＰＯ
４をそれぞれ２．８１２ｇ及び２．１９７ｇ、水１ｌに
溶解し、得られた溶液をさらに水で希釈してこの実験に
使用する人工汚水として調合した。(Artificial wastewater) K 2 HPO 4 and KH 2 PO
4 was dissolved in 2.12 g and 2.197 g of water and 1 liter of water, and the resulting solution was further diluted with water to prepare an artificial wastewater used in this experiment.
【００１１】（脱リン試験）前記脱リン材を一旦微粉砕
し、その微粉砕された脱リン材を、１ｌの汚水中にオル
トリン酸態リンを５．１２ｍｇ含有する人工汚水１００
ｍｌに対して種々の量添加して、脱リン材混合人工汚水
を１分間に３０回振盪する振盪器に１時間かけた後に、
どれくらいのオルトリン酸態リンが除去されるかを実験
した（実施例１）。実験後、得られた懸濁液を▲ろ▼過
し、▲ろ▼液のｐＨ及びオルトリン酸態リンの残存量を
測定した結果を表１に示す。(Phosphorus removal test) The dephosphorization material was once finely pulverized, and the finely pulverized dephosphorization material was artificial sewage 100 containing 5.12 mg of orthophosphate phosphorus in 1 liter of sewage.
Various amounts were added to ml, and the dephosphorizing agent-mixed artificial sewage was shaken 30 times a minute for 1 hour, and then shaken.
Experiments were carried out to find out how much orthophosphate phosphorus was removed (Example 1). After the experiment, the obtained suspension was filtered, and the pH of the filtrate and the residual amount of orthophosphoric acid phosphorus were measured, and the results are shown in Table 1.
【００１２】[0012]
【表１】 [Table 1]
【００１３】比較のために、従来技術の脱リン材として
多孔質珪酸カルシウム水和物だけを前記同様に添加した
実験を行った（比較例１）。その結果を表２に示す。本
実施例は比較例に比べて同じ添加量でオルトリン酸の除
去率が高いことが判明した。For comparison, an experiment was conducted in which only porous calcium silicate hydrate was added as a conventional dephosphorizing material in the same manner as described above (Comparative Example 1). The results are shown in Table 2. It was found that the removal rate of orthophosphoric acid was higher in this example than in the comparative example with the same addition amount.
【００１４】[0014]
【表２】 [Table 2]
【００１５】１ｌの汚水中にオルトリン酸態リンを５．
１２ｍｇ含有する人工汚水１００ｍｌに対して前記実施
例１で使用した脱リン材５００ｍｇを添加して脱リン材
混合人工汚水とし、これを１分間に３０回振盪する振盪
器に種々の時間かけて脱リン実験を行った。実験後得ら
れた懸濁液を▲ろ▼過し、▲ろ▼液のｐＨ及びオルトリ
ン酸態リンの残存量を測定した（実施例２）。その実験
結果を表３に示す。5. Orthophosphate phosphorus was added to 1 liter of wastewater.
To 100 ml of artificial sewage containing 12 mg, 500 mg of the dephosphorization material used in the above Example 1 was added to obtain a dephosphorization material-mixed artificial sewage, which was dewatered for 30 hours in a shaker that was shaken 30 times per minute. A phosphorus experiment was conducted. The suspension obtained after the experiment was filtered, and the pH of the filtrate and the residual amount of orthophosphate phosphorus were measured (Example 2). The experimental results are shown in Table 3.
【００１６】[0016]
【表３】 [Table 3]
【００１７】比較のために、従来技術の脱リン材として
多孔質珪酸カルシウム水和物だけ前記同様に添加した実
験を行った（比較例２）。その結果を表４に示す。本実
施例は比較例に比べて短時間でオルトリン酸態リンを除
去することが判った。For comparison, an experiment was conducted in which only porous calcium silicate hydrate was added as a conventional dephosphorizing material in the same manner as described above (Comparative Example 2). The results are shown in Table 4. It was found that this example removes orthophosphate phosphorus in a shorter time than the comparative example.
【００１８】[0018]
【表４】 [Table 4]
【００１９】[0019]
【実施例３】 （脱リン材の製造）前記実施例１及び２に使用した石灰
処理汚泥８５重量部と早強セメント１５重量部の割合か
らなる混合物を撹拌機で十分撹拌した後、前記と同様の
装置及び条件で養生した。得られた養生物を粉砕してこ
の実施例の脱リン材を製造した。この粉末をＸ線回折で
分析したところ、その主成分は水酸アパタイトであり、
他に炭酸カルシウムが含まれていることが確認された。
そのＸ線回折チャートを図１に示す。次に、前記養生物
と多孔質珪酸カルシウム水和物とを種々の割合で混合し
て、この実施例の脱リン材を製造した。Example 3 (Production of dephosphorization material) A mixture of 85 parts by weight of lime-treated sludge used in Examples 1 and 2 and 15 parts by weight of early-strength cement was sufficiently stirred with a stirrer, and then It was cured with the same equipment and conditions. The resulting aquaculture was crushed to produce the dephosphorization material of this example. When this powder was analyzed by X-ray diffraction, its main component was hydroxyapatite,
In addition, it was confirmed that calcium carbonate was contained.
The X-ray diffraction chart is shown in FIG. Next, the aquaculture and the porous calcium silicate hydrate were mixed at various ratios to manufacture the dephosphorization material of this example.
【００２０】（人工汚水及び脱リン実験）オルトリン酸
態リンを水１ｌに４．６８ｍｇ含有する人工汚水１００
ｍｌを調合し、それに前記で製造した脱リン材を３００
ｍｇ添加して、その懸濁物を１時間前記と同様に振盪さ
せた。この実験に用いた実験水準の脱リン材の組成割合
及び全リンの含有率を表５に示す。(Artificial Sewage and Dephosphorization Experiment) An artificial sewage 100 containing 4.68 mg of orthophosphate phosphorus in 1 liter of water.
ml of the dephosphorizing material prepared above, and
mg was added and the suspension was shaken for 1 hour as before. Table 5 shows the composition ratios of the experimental dephosphorization materials used in this experiment and the total phosphorus content.
【００２１】[0021]
【表５】 [Table 5]
【００２２】また、前記懸濁液を▲ろ▼過してその▲ろ
▼液のｐＨ、それに含まれているオルトリン酸態リン及
びカルシウムイオンの濃度を測定し表６の結果を得た。Further, the suspension was filtered, and the pH of the filtrate and the concentrations of orthophosphate phosphorus and calcium ions contained therein were measured and the results shown in Table 6 were obtained.
【００２３】[0023]
【表６】 [Table 6]
【００２４】脱リン材中の全リンの含有率（表５参照）
とリンの除去率（表６）との関係を図２に示す。図２か
ら明白な通り本発明の脱リン材中には所定量のリンが含
有されているとリンの除去率は高くなる。好ましくは、
全リンとして２〜７重量％含有している本発明の脱リン
材の方が脱リン効果が大きい。Content of total phosphorus in the dephosphorized material (see Table 5)
FIG. 2 shows the relationship between the phosphorus removal rate and the phosphorus removal rate (Table 6). As is clear from FIG. 2, the phosphorus removal rate is high when the dephosphorizing material of the present invention contains a predetermined amount of phosphorus. Preferably,
The dephosphorizing material of the present invention containing 2 to 7% by weight as total phosphorus has a greater dephosphorizing effect.
【００２５】[0025]
【実施例４】直径５０ｍｍ、長さ３００ｍｍのカラムに
平均粒径５〜１０ｍｍの多孔質珪酸カルシウム水和物を
５００ｍｌ充填した。そしてこのカラムにそれと同じ大
きさのカラムを直列に接続するとともに、後者のカラム
に次の脱リン材を５００ｍｌ充填した。すなわち、この
脱リン材は、まず、実施例１及び実施例２の製造方法に
準じて、構成成分の配合割合を変化させてラッシヒリン
グ形状の脱リン材を４種製造し、それらをジョウクラッ
シャで粗破砕して平均粒径５〜１０ｍｍの脱リン材に篩
分けしたものである。なお、前記４種の脱リン材の組成
は表７の通りである。またこの脱リン材の粉末をＸ線回
折で分析した結果を図３に示す。全リンの含有率の分析
結果を表８に示す。Example 4 A column having a diameter of 50 mm and a length of 300 mm was packed with 500 ml of a porous calcium silicate hydrate having an average particle size of 5 to 10 mm. A column of the same size was connected in series to this column, and the latter column was filled with 500 ml of the following dephosphorization material. That is, this dephosphorization material firstly produced four types of Raschig ring-shaped dephosphorization materials by changing the compounding ratios of the constituents in accordance with the production methods of Example 1 and Example 2 and using them with a jaw crusher. It is roughly crushed and sieved to a dephosphorization material having an average particle size of 5 to 10 mm. The compositions of the four types of dephosphorizing materials are shown in Table 7. The results of X-ray diffraction analysis of the powder of the dephosphorizing material are shown in FIG. Table 8 shows the analysis results of the total phosphorus content.
【００２６】[0026]
【表７】 [Table 7]
【００２７】[0027]
【表８】 [Table 8]
【００２８】上記のように設置された実験装置にオルト
リン酸態リン濃度が４．７４ｍｇ／ｌの人工汚水を１，
０００ｍｌ／ｈｒの速度で通水して１週間後処理水の特
性を測定した。それらの結果を表９に示す。なお、比較
のため多孔質珪酸カルシウムのみに同様に通水させた結
果も併せて表９に示した（比較例３）。表９から判るよ
うに、本実施例は、比較例に比べてオルトリン酸態リン
の除去率が高い。The artificial sewage having an orthophosphoric acid phosphorus concentration of 4.74 mg / l was placed in the experimental apparatus installed as described above.
Water was passed at a rate of 000 ml / hr, and the characteristics of the post-treated water were measured for 1 week. The results are shown in Table 9. For comparison, the results obtained by passing water through only porous calcium silicate are also shown in Table 9 (Comparative Example 3). As can be seen from Table 9, this example has a higher removal rate of orthophosphate phosphorus than the comparative example.
【００２９】[0029]
【表９】 [Table 9]
【００３０】本発明は、その根本的技術思想を踏襲して
その効果を著しく損なわない限度において前記実施の態
様の一部を、例えば次のように変更することができる。 （１）リン酸質原料として、リン酸カルシウム、リン酸
水素カルシウム、水酸アパタイト等、いずれのオルトリ
ン酸塩を使用することができる。 （２）脱リン材の形状、脱リン材を充填するカラムの容
積比、カラムへの通水速度も被処理水である汚水の性状
に合わせて効率的に脱リンできるよう種々変更できる。In the present invention, a part of the above-mentioned embodiment can be modified as follows, for example, within the scope of not ruining the effect by following the fundamental technical idea. (1) As the phosphate material, any orthophosphate such as calcium phosphate, calcium hydrogen phosphate, hydroxyapatite, etc. can be used. (2) The shape of the dephosphorization material, the volume ratio of the column packed with the dephosphorization material, and the water flow rate to the column can be variously changed in accordance with the property of the wastewater as the water to be treated so as to efficiently perform the dephosphorization.
【００３１】（３）有機物や窒素化合物をオルトリン酸
塩とともに含有する被処理水を処理する場合、前段の過
程で微生物を担持した珪酸カルシウム水和物を使用する
ことができる。 （４）本発明に係る脱リン材は、他の汚水処理方法、例
えば活性汚泥法が採用されている過程において曝気槽に
添加して汚水処理に利用することができる。オルトリン
酸塩を含有する水が入っている池や湖の脱リンを行う場
合、それらに直接本発明の脱リン材を散布することも可
能である。(3) When treating water to be treated containing an organic substance and a nitrogen compound together with an orthophosphate, a calcium silicate hydrate carrying a microorganism can be used in the preceding step. (4) The dephosphorizing material according to the present invention can be added to an aeration tank and used for sewage treatment in a process in which another sewage treatment method, for example, an activated sludge method is adopted. When performing dephosphorization on a pond or lake containing water containing orthophosphate, it is also possible to spray the dephosphorizing agent of the present invention directly on them.
【００３２】[0032]
【発明の効果】以上詳述したように、本発明は、比較的
低濃度のリンを含有する廃水の処理においてもリンの除
去を可能にするという優れた効果を発揮する。INDUSTRIAL APPLICABILITY As described above in detail, the present invention exerts an excellent effect of enabling removal of phosphorus even in the treatment of waste water containing a relatively low concentration of phosphorus.
【図１】本発明の実施例３に使用した脱リン材のＸ線回
折チャートである。FIG. 1 is an X-ray diffraction chart of a dephosphorization material used in Example 3 of the present invention.
【図２】脱リン材中の全リンの含有率とリンの除去率と
の関係を示す線図である。FIG. 2 is a diagram showing the relationship between the total phosphorus content in the dephosphorized material and the phosphorus removal rate.
【図３】前記と同じく実施例４に使用した前記同様のチ
ャートである。FIG. 3 is a chart similar to the above used in Example 4 as described above.
Claims (5)
化合物と珪酸カルシウム水和物とを含有する脱リン材。1. A dephosphorizing material containing at least a sparingly water-soluble calcium phosphate compound and calcium silicate hydrate.
タイトである請求項１記載の脱リン材。2. The dephosphorization material according to claim 1, wherein the calcium phosphate compound is hydroxyapatite.
１〜７重量％含有されている請求項１記載の脱リン材。3. The dephosphorization material according to claim 1, wherein the calcium phosphate compound is contained in an amount of 1 to 7% by weight as total phosphorus.
イト、ゾノトライト及びＣＨＳから選ばれる少なくとも
１種からなる請求項１記載の脱リン材。4. The dephosphorization material according to claim 1, wherein the calcium silicate hydrate comprises at least one selected from tobermorite, xonotlite and CHS.
ム水和物の充填層を通した後、難水溶性のリン酸カルシ
ウム化合物と珪酸カルシウム水和物とを含有する脱リン
材の充填層に通すことを特徴とする脱リン方法。5. An orthophosphate-containing wastewater is passed through a packed bed of calcium silicate hydrate and then through a packed bed of a dephosphorization material containing a sparingly water-soluble calcium phosphate compound and calcium silicate hydrate. Characterizing dephosphorization method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP34110494A JP3627988B2 (en) | 1994-12-28 | 1994-12-28 | Dephosphorization material and dephosphorization method using the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP34110494A JP3627988B2 (en) | 1994-12-28 | 1994-12-28 | Dephosphorization material and dephosphorization method using the same |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH08182993A true JPH08182993A (en) | 1996-07-16 |
| JP3627988B2 JP3627988B2 (en) | 2005-03-09 |
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ID=18343301
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
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| Country | Link |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002292372A (en) * | 2001-01-29 | 2002-10-08 | Sekisui Chem Co Ltd | Method for producing dephosphorizing agent |
| JP2003117566A (en) * | 2001-10-17 | 2003-04-22 | Sekisui Chem Co Ltd | Dephosphorizing material |
| JP2007268409A (en) * | 2006-03-31 | 2007-10-18 | Nagasaki Prefecture | Phosphorus removal method and apparatus |
| JPWO2015008397A1 (en) * | 2013-07-16 | 2017-03-02 | 太平洋セメント株式会社 | Water purification material and water quality purification method for seafood farm |
-
1994
- 1994-12-28 JP JP34110494A patent/JP3627988B2/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002292372A (en) * | 2001-01-29 | 2002-10-08 | Sekisui Chem Co Ltd | Method for producing dephosphorizing agent |
| JP2003117566A (en) * | 2001-10-17 | 2003-04-22 | Sekisui Chem Co Ltd | Dephosphorizing material |
| JP2007268409A (en) * | 2006-03-31 | 2007-10-18 | Nagasaki Prefecture | Phosphorus removal method and apparatus |
| JP4649596B2 (en) * | 2006-03-31 | 2011-03-09 | 長崎県 | Phosphorus removal method and phosphorus removal apparatus |
| JPWO2015008397A1 (en) * | 2013-07-16 | 2017-03-02 | 太平洋セメント株式会社 | Water purification material and water quality purification method for seafood farm |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3627988B2 (en) | 2005-03-09 |
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