JP2003305462A - Dephosphorizing element in liquid and method for manufacturing the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a dephosphorizing element to easily and surely remove phosphate ion from a liquid containing phosphate ion such as waste water containing phosphate ion without requiring a special device or many processes. <P>SOLUTION: The dephosphorizing element is composed of a material which precipitates and adsorbs phosphorus on the element surface or on the inner walls of open cells of its porous body in a liquid containing phosphate ion. The element preferably consists of a porous material having open cells produced by partially binding a large number of dephosphorizing granules with a water- resistant binder. The dephosphorizing material in a liquid is, for example, a material essentially comprising zeolite, essentially comprising calcium carbonate or calcium phosphate, or essentially comprising one or a combination of two or more kinds selected from titanium oxide, zirconium oxide and iron oxide. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to the provision of an in-liquid dephosphorization element used for removing phosphate ions from a phosphate ion-containing liquid such as wastewater containing phosphate ions.

[0002]

2. Description of the Related Art Conventionally, as a method for removing phosphate ions contained in tap water, sewage, industrial wastewater, city wastewater, etc., phosphate ion-containing wastewater is treated in the presence of calcium ions. , Phosphate ores and other crystal seeds containing calcium phosphate, and then removing the phosphate ions by precipitating on the crystal seeds, drainage containing a large amount of phosphate ions and ammoniacal nitrogen, magnesium chloride Is added, and the pH is adjusted to collect and remove magnesium ammonium phosphate as a precipitate,
Alternatively, in a biological wastewater treatment system using activated sludge, there is a method of transferring phosphorus components to excess sludge and removing it by using a combination of an anaerobic tank and an aerobic tank. However, in the conventional method, the dephosphorization method is complicated, and the phosphate ion cannot be easily removed from the wastewater containing the phosphate ion.

[0003]

DISCLOSURE OF THE INVENTION The present invention solves the above-mentioned problems of the prior art, and provides an in-liquid dephosphorization element having the following constitution and a method for producing the same. (1) An in-liquid dephosphorization element that is installed in a liquid and removes phosphorus components in the liquid, in which phosphorus is deposited / adsorbed on the surface or the inner wall surface of the porous communication hole. An element for submerged dephosphorization, which is made of a material (2) An element for liquid dephosphorization that is installed in a liquid and removes phosphorus components in the liquid, in which a large number of dephosphorizable powder particles are partially bonded with a water resistant binder. An element for dephosphorization in liquid, which is composed of a continuous porous material formed of the above, and is made of a material that deposits and adsorbs phosphorus on its surface or the inner wall surface of the porous communication hole in the same liquid. (3) The material for the liquid dephosphorization element is zeolite,
Particularly preferably, the main element is a synthetic zeolite synthesized from coal ash, incinerator ash, fly ash, etc., and the element for submerged dephosphorization according to the above (1) or (2) is characterized. (4) In-liquid dewatering according to the above item (1) or (2), characterized in that the material of the element for dephosphorization in liquid is mainly composed of calcium carbonate (for example, fossil shellfish, coral fossil) or calcium phosphate. Element for phosphorus. (5) The material of the element for in-liquid dephosphorization is mainly composed of one or a combination of two or more selected from titanium oxide, zirconium oxide, and iron oxide. ) Or the element for dephosphorization in liquid according to (2). (6) The above-mentioned item (1) or (1), characterized in that the material of the element for dephosphorization in liquid is mainly composed of calcium silicate hydrate and calcium carbonate, for example, fossil shellfish, or a mixture of coral fossil and calcium sulfate. (2) The element for liquid dephosphorization according to the above. (7) The submerged dewatering according to any one of (1) to (6) above, wherein the material for the submerged dephosphorization element includes an adsorbent material such as bamboo charcoal and palm shell charcoal. Element for phosphorus. (8) The submerged dephosphorization element according to any one of the items (1) to (7), wherein the water-resistant binder is an alkyl silicate hydrolysis product. (9) The submerged dephosphorization element according to any one of the above items (1) to (8), wherein the water resistant binder contains silica nasol. (10) The submerged dephosphorization element according to any one of the above items (1) to (9), wherein the water resistant binder contains an alumina sol. (11) The submerged dephosphorization according to any one of (1) to (10) above, wherein the shape and structure of the submerged dephosphorization element is a molded product having a porous communication hole structure. Element for. (12) The above-mentioned (1) to (10), wherein the shape and structure of the submerged dephosphorization element is a molded body having a porous communication hole structure and provided with a large number of through holes. The element for dephosphorization in liquid according to any one of items. (13) The above-mentioned (1) to (12), characterized in that the shape / structure of the submerged dephosphorization element is such that a large number of string-shaped bodies are crossed and bonded at the crossing points. The element for dephosphorization in liquid according to any one of items. (14) The above-mentioned (1) to (1), wherein the shape and structure of the submerged dephosphorization element are honeycomb-shaped.
The element for dephosphorization in liquid according to any one of 2). (15) The above-mentioned (1) to (1), wherein the shape and structure of the submerged dephosphorization element are corrugated.
The element for liquid dephosphorization according to any one of (12). (16) The above-mentioned (1) to (12), wherein the shape and structure of the element for dephosphorization in liquid is a short tubular shape.
The submerged dephosphorization element according to any one of 1. (17) A method for manufacturing an element for submerged dephosphorization, which is installed in a solution and removes a phosphorus component in the solution, which is formed by adding and mixing a water resistant binder to a dephosphorizable powder or granular material. After that, the powdery and granular materials are partially bonded to each other, and a treatment for forming a porous dephosphorization molded body having communicating holes is performed. (18) A method for producing an element for liquid dephosphorization, which is installed in a liquid to remove a phosphorus component in the liquid, which is formed by adding and mixing an alkyl silicate compound to a dephosphorizable powder or granular material. After that, the alkyl silicate compound is hydrolyzed and polymerized to produce a silicic acid polymer, and the silicic acid polymer partially binds the dephosphorizable powder particles to each other to form a porous dephosphorization molding of communicating holes. A method for producing an element for liquid dephosphorization, which comprises subjecting the body to a treatment.

[0004]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described. When the dephosphorization element of the present invention is installed in a liquid, phosphorus is deposited / adsorbed on the surface or the inner wall surface of the porous communication holes to remove the phosphorus component in the liquid. It is preferable that the dephosphorizable powder and granules are partially connected to each other with a water resistant binder to form a continuous porous material. As a material of the dephosphorization element, one mainly composed of zeolite, one mainly composed of calcium carbonate or calcium phosphate, one or more combinations selected from titanium oxide, zirconium oxide, or iron oxide is mainly composed. And those mainly containing a mixture of calcium silicate hydrate and calcium carbonate, those mainly containing Portland cement, and the like. As the zeolite, natural zeolite and Ca-type zeolite are particularly preferable. As the binding material, a water-resistant binding material is preferable in view of the fact that the in-liquid dephosphorization element of the present invention is installed and used in water, and exhibits binding strength at room temperature to several hundreds of degrees of treatment, and becomes water-insoluble. Preferred are inorganic binders such as silica sol such as colloidal silica, alumina sol, alkyl silicate such as ethyl silicate and methyl silicate. A mixture of silica sol and alumina sol is particularly preferable.

The shape and structure of the element for dephosphorization in liquid is
An external view is shown in FIG. 1, and an enlarged view of its fine structure is shown in FIGS. 2 (a) and 2 (b) ((a) shows that the material particles 1 ... Which are connected via the parts 4 ...
It is an enlarged view of a fine structure of a continuous porous material formed by partially bonding a number of dephosphorizable powdery particles to each other with a water resistant binder,
(B) In the figure, 1'is a skeleton made of the material for the element for dephosphorization 1 '
.. is an enlarged view of a fine structure of a communicating porous material in which voids 2 of communicating holes are arranged in a porous three-dimensional net shape. ) And a partial cross-sectional external view of the plate-like body shown in FIG. 3 and having a porous communication structure and having a large number of through holes are preferable. The shape and structure are honeycomb (Fig. 4), corrugated (Fig. 5), short tubular (Fig. 6), and a number of cords are crossed at the crossing point. Examples include those formed by combining (FIG. 7: external view, FIG. 8: enlarged view of fine structure) and the like. In the figure, 1 is material particles of a dephosphorization element such as zeolite, 1'is a material skeleton of a dephosphorization element such as zeolite, 2 is a void portion of a communication hole, 3 is a through hole, 4 is a water resistant bond The material portion 10 is a porous communication structure.

The production of the element for dephosphorization in liquid of the present invention is carried out by first adding a small amount of a water resistant binder such as ethyl silicate to a dephosphorization powder such as natural zeolite and mixing it, and then molding it at a temperature of several tens of degrees. By heating at (° C.) to several hundreds of degrees (° C.), the powdery and granular materials are partially bonded to each other to produce a porous dephosphorized molded product having communicating holes. In particular, alkyl silicates such as ethyl silicate are hydrolyzed and slightly heated to produce a glassy polymer of silicic acid (SiO2), which is a water-insoluble and strong binding material.

[0007]

According to the dephosphorization element of the present invention,
It is possible to easily and reliably remove phosphate ions from a phosphate ion-containing liquid such as waste water containing phosphate ions without requiring a special device or many steps.

[Brief description of drawings]

FIG. 1 is an external view of a dephosphorization element of the present invention.

FIG. 2 is an enlarged view of a fine structure of a dephosphorization element,

FIG. 3 is a partial cross-sectional external view of a plate-like body of the dephosphorization element,

FIG. 4 is an external view of a honeycomb-shaped dephosphorization element,

FIG. 5 is an external view of a corrugated dephosphorization element,

FIG. 6 is an external view of a short tubular dephosphorization element,

FIG. 7 is an external view of a dephosphorization element formed by crossing a large number of cords and connecting them at crossing points.

FIG. 8 is an enlarged view of a fine structure of a dephosphorization element formed by intersecting a large number of cords and connecting them at intersections;

[Explanation of symbols]

1: Material particles of dephosphorization element such as zeolite, 1 ': Material skeleton of dephosphorization element such as zeolite, 2: Voids of communication holes, 3: Through holes, 4: Water-resistant binding material part, 10 : Porous communication pore structure,

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) B01J 20/28 B01J 20/28 A 20/30 20/30 C02F 1/58 C02F 1/58 S // C04B 38/00 303 C04B 38/00 303Z 304 304 304 F Term (reference) 4D024 AA01 AA04 AB12 BA02 BA03 BB05 4D038 AA08 AB52 BB06 4G019 FA02 FA11 FA12 GA02 4G066 AA04B AA20D AA22D BA01 BA07 CA41 EA13 FA01 FA07 FA07 FA07

Claims (18)

[Claims] 1. An in-liquid dephosphorization element, which is installed in a liquid to remove phosphorus components in the liquid, wherein phosphorus is deposited on the surface or the inner wall surface of the porous communication hole in the liquid. An element for liquid dephosphorization, which is made of an adsorbing material. 2. An in-liquid dephosphorization element, which is installed in a liquid to remove phosphorus components in the liquid, wherein a large number of dephosphorization powder particles are partially made of a water resistant binder. An element for dephosphorization in liquid, which is composed of a continuous porous material bonded to each other, and is made of a material which deposits and adsorbs phosphorus on its surface or the inner wall surface of the porous communication hole in the same liquid. 3. The material for the submerged dephosphorization element is mainly composed of zeolite.
Or the element for dephosphorization in liquid according to 2. 4. The submerged dephosphorization element according to claim 1, wherein the material for the submerged dephosphorization element is mainly composed of calcium carbonate or calcium phosphate. 5. The material for the submerged dephosphorization element is mainly composed of one or a combination of two or more selected from titanium oxide, zirconium oxide, and iron oxide. Item 1. An element for liquid dephosphorization according to item 1 or 2. 6. A liquid dephosphorization element material is mainly composed of a mixture of calcium silicate hydrate, calcium carbonate and calcium sulfate.
Or the element for dephosphorization in liquid according to 2. 7. The material for the submerged dephosphorization element is bamboo charcoal,
The in-liquid dephosphorization element according to any one of claims 1 to 6, which contains an adsorptive material such as coconut shell charcoal. 8. The submerged dephosphorization element according to any one of claims 1 to 7, wherein the water-resistant binder is an alkyl silicate hydrolysis product. 9. The submerged dephosphorization element according to any one of claims 1 to 8, wherein the water resistant binder contains silica nasol. 10. The submerged dephosphorization element according to any one of claims 1 to 9, wherein the water resistant binder contains alumina sol. 11. The in-liquid dephosphorization according to any one of claims 1 to 10, wherein the shape and structure of the in-liquid dephosphorization element is a molded product having a porous communication hole structure. element. 12. A liquid dephosphorization element having a shape and structure which is a molded product having a porous communication hole structure and is provided with a large number of through-holes. The element for submerged dephosphorization according to item 1. 13. A liquid dephosphorization element having a shape and structure in which a large number of string-shaped bodies are crossed and connected at crossing points. The element for submerged dephosphorization according to item 1. 14. The in-liquid dephosphorization element has a honeycomb structure in shape and structure.
<12> The submerged dephosphorization element according to any one of <12>. 15. The submerged dephosphorization element according to claim 1, wherein the submerged dephosphorization element has a corrugated shape and structure. 16. The liquid dephosphorization element has a short tubular shape and structure.
The element for liquid dephosphorization according to any one of 2 above. 17. A method for producing an element for liquid dephosphorization, which is installed in a liquid to remove phosphorus components in the liquid, wherein a water-resistant binder is added to and mixed with the dephosphorizable powder or granular material. The method for producing an in-liquid dephosphorization element, comprising the steps of: forming a porous dephosphorization molded body having communication holes by partially bonding the powdery and granular materials together. 18. A method of producing an element for liquid dephosphorization, which is installed in a liquid and removes a phosphorus component in the liquid, comprising adding and mixing an alkyl silicate compound to a dephosphorizable powder or granular material. After molding, the alkyl silicate compound is hydrolyzed and polymerized to produce a silicic acid polymer, and the silicic acid polymer partially binds the dephosphorizable powder particles to each other to form a porous dephosphorization of the communicating pores. A method for producing an element for dephosphorization in liquid, which is characterized in that the element is subjected to a treatment for forming an elastic molded body.