Abrégé

[Problem] To collect phosphorous and produce a high-quality phosphorous fertilizer from sewage water at low cost. [Solution] A method for producing a phosphorous fertilizer, which comprises bringing septage (S1) in a sewage-treatment plant into contact with a calcium-containing collecting material (A1) to collect phosphorous from the septage (S1) and burning a collected phosphorous product (AP), sludge (S9) generated in the sewage-treatment plant and a calcium source that serves as composition-adjusting agent (A2). The burning of the collected phosphorous product (AP) and others may be carried out at a burning temperature of 1150 to 1350˚C inclusive. The calcium oxide content in the phosphorous fertilizer may be 30 to 55 mass% inclusive. It becomes possible to produce a high-quality phosphorous fertilizer having a phosphoric acid solubility in an aqueous citric acid solution of 60% or more and/or a silicic acid solubility of 40% or more. Besides the calcium source, a magnesium source and/or a silica source may be added as the composition-adjusting agent. The resultant burned product (B1) may be pulverized and then granulated together with a granulation aid (A3) using a granulating/molding machine(17).

Classes IPC  ?

• C05F 7/00 - Engrais fabriqués à partir des eaux résiduaires ou d'épandage, wagage, limon ou masses similaires
• C02F 1/28 - Traitement de l'eau, des eaux résiduaires ou des eaux d'égout par absorption ou adsorption
• C02F 1/58 - Traitement de l'eau, des eaux résiduaires ou des eaux d'égout par élimination de composés spécifiés dissous
• C05B 3/00 - Engrais à base essentielle de phosphate bicalcique
• C05B 13/06 - Engrais de méta- ou polyphosphates alcalins ou alcalino-terreux

Abrégé

The present invention provides a phosphorus recovery material, method for producing same, and phosphorus recovery method, which offer excellent phosphorus fixation performance as well as excellent sedimentation properties after phosphorus fixation, without decarboxylating phosphorus-containing water that includes carbonic acid. The present invention provides, inter alia, a phosphorus recovery material comprising either amorphous calcium silicate hydrate alone or a complex of Ca(OH)2 and amorphous calcium silicate hydrate obtained by mixing lime and an aqueous solution of sodium silicate without heating, the Ca/Si molar ratio of the hydrate alone or the complex being 0.8 to 1.5.

Classes IPC  ?

• C02F 1/58 - Traitement de l'eau, des eaux résiduaires ou des eaux d'égout par élimination de composés spécifiés dissous
• C01B 25/00 - PhosphoreSes composés
• C01B 33/24 - Silicates alcalino-terreux
• C05B 7/00 - Engrais à base essentielle d'orthophosphates alcalins ou d'ammonium
• C05F 7/00 - Engrais fabriqués à partir des eaux résiduaires ou d'épandage, wagage, limon ou masses similaires

Abrégé

The present invention provides: a phosphorous-collecting material which has excellent phosphorous adsorption performance and can exhibit an excellent sedimentation property after adsorbing phosphorous; a method for producing the phosphorous-collecting material; and a phosphorous collection method. The phosphorous-collecting material according to the present invention comprises an amorphous calcium silicate hydrate alone or a complex of the amorphous calcium silicate hydrate and Ca(OH)2, wherein the amorphous calcium silicate hydrate is produced by mixing an aqueous sodium silicate solution with lime under non-heating conditions, and wherein the Ca/Si molar ratio in the hydrate alone or the complex is 0.8 to 20. The method for producing a phosphorous-collecting material according to the present invention comprises mixing an aqueous sodium silicate solution with lime under non-heating conditions to produce the amorphous calcium silicate hydrate alone or the complex of the amorphous calcium silicate hydrate and Ca(OH)2. The phosphorous collection method according to the present invention comprises mixing phosphorous-containing water with the amorphous calcium silicate hydrate alone or the complex of the amorphous calcium silicate hydrate and Ca(OH)2 to produce aggregates on which phosphorous is adsorbed and then subjecting the aggregates to solid/liquid separation to collect phosphorous.

Classes IPC  ?

• B01J 20/10 - Compositions absorbantes ou adsorbantes solides ou compositions facilitant la filtrationAbsorbants ou adsorbants pour la chromatographieProcédés pour leur préparation, régénération ou réactivation contenant une substance inorganique contenant de la silice ou un silicate
• C02F 1/28 - Traitement de l'eau, des eaux résiduaires ou des eaux d'égout par absorption ou adsorption
• C02F 1/58 - Traitement de l'eau, des eaux résiduaires ou des eaux d'égout par élimination de composés spécifiés dissous

Abrégé

The present invention provides: a phosphate fertilizer which has a high phosphorous solubility in an aqueous citric acid solution and can contribute to the saving of a natural resources for phosphorous or the saving of energy in the production of the fertilizer; and a method for producing phosphate fertilizer. This phosphate fertilizer is produced by burning a mixed raw material comprising sewage sludge and/or a material derived from sewage sludge and a calcium source. This phosphate fertilizer has a CaO content of 35-60 mass%, a SiO2 content of 5-35 mass%, a P2O5 content of 5-35 mass%, and a content of components excluding CaO, SiO2 and P2O5 of 30 mass% or less. The method for producing a phosphate fertilizer comprises: a mixing step of mixing sewage sludge and/or a material derived from sewage sludge with a calcium source and further mixing the resultant mixture with a silica source to produce a mixed raw material; and a burning step of burning the mixed raw material using a burning furnace at 1150-1350ºC to produce a burned product as the phosphate fertilizer.

Classes IPC  ?

• C05B 13/00 - Engrais produits par grillage des matières phosphatées
• B09B 3/00 - Destruction de déchets solides ou transformation de déchets solides en quelque chose d'utile ou d'inoffensif
• C02F 11/10 - Traitement des boues d'égoutDispositifs à cet effet par pyrolyse
• C05D 9/00 - Autres engrais inorganiques
• C05F 7/00 - Engrais fabriqués à partir des eaux résiduaires ou d'épandage, wagage, limon ou masses similaires

Abrégé

[Problem] To recover phosphorus accumulated in a sewage-treatment plant or the like at a low cost in such a manner as to facilitate the utilization of the thus recovered phosphorus. To efficiently utilize the recovered phosphorus as a fertilizer. [Solution] Phosphorus in discharged water, which is a phosphorus source, is adsorbed by a phosphorus recovery material formed of an amorphous calcium silicate-based material and thus recovered. After adding the phosphorus recovery material to the discharged water that is a phosphorus source, it is preferred to adjust the pH value of the discharged water to 7.0 or higher. Also, it is preferred that the discharged water that is a phosphorus source is decarboxylated by reducing the pH value thereof to 6.0 or lower and then the phosphorus recovery material is added. As the phosphorus recovery material, an aggregate consisting of amorphous calcium silicate hydrate and Ca(OH)2 and having a Ca/Si molar ratio of 0.8-20 inclusive is preferred. The aggregate may be obtained by solid-liquid separation and drying. Alternatively, a slurry or paste containing the aggregate may be used. The recovered phosphorus recovery material can be used as a fertilizer.

Classes IPC  ?

• C02F 1/28 - Traitement de l'eau, des eaux résiduaires ou des eaux d'égout par absorption ou adsorption
• B01J 20/04 - Compositions absorbantes ou adsorbantes solides ou compositions facilitant la filtrationAbsorbants ou adsorbants pour la chromatographieProcédés pour leur préparation, régénération ou réactivation contenant une substance inorganique contenant des composés des métaux alcalins, des métaux alcalino-terreux ou du magnésium
• C02F 1/58 - Traitement de l'eau, des eaux résiduaires ou des eaux d'égout par élimination de composés spécifiés dissous
• C05B 17/00 - Autres engrais phosphatés, p. ex. phosphates naturels, os verts
• C05F 7/00 - Engrais fabriqués à partir des eaux résiduaires ou d'épandage, wagage, limon ou masses similaires

Produits et services

(1) Feed for animals.