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Method for removing and recovering phosphate in waste water

A phosphate and wastewater technology, applied in the direction of phosphate, chemical instruments and methods, phosphorus oxyacids, etc., to achieve the effects of short residence time, high removal efficiency and wide application range

Active Publication Date: 2012-05-02
SHANGHAI OCEAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

So far, no research has been reported on the application of calcite-hydroxyapatite composites for the removal and recovery of phosphate in water

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] First, hydroxyapatite was synthesized by solution precipitation method: 50ml of Ca(NO 3 ) 2 Solution and 30ml concentration are 1mol / L (NH 4 ) 2 HPO 4 The solution was mixed with 0.8mol / L NH 3 OH solution to adjust the pH to 9, then put the mixed solution in a shaker, shake it at a speed of 50-500 rpm for 48 hours, take the precipitate and wash it to neutral, dry it to get hydroxyapatite, and then crush it into granules Particles with a diameter of 200 mesh;

[0023] Then, calcite with a particle size of 300 mesh and hydroxyapatite with a particle size of 200 mesh were mixed according to a mass ratio of 5:1 to prepare a calcite-hydroxyapatite composite adsorbent.

[0024] Add 0.1g calcite, 0.02g hydroxyapatite, and 0.12g calcite-hydroxyapatite composite to 25mL phosphate-containing PO 4 3- In a solution with a concentration of 50mg / L and a pH value of 7, place it in a constant temperature water bath shaker at 30°C and stir at a speed of 150 rpm for 4 hours. After...

Embodiment 2

[0027] First, the solution precipitation method is used to synthesize hydroxyapatite (the steps are the same as in Example 1), and then calcite with a particle size of 300 mesh and hydroxyapatite with a particle size of 200 mesh are mixed according to a mass ratio of 10:1 to obtain calcite-hydroxyapatite Apatite composite adsorbent.

[0028] Add 0.2g calcite, 0.02g hydroxyapatite, and 0.22g calcite-hydroxyapatite composite to 25mL phosphate-containing PO 4 3- In a solution with a concentration of 50mg / L and a pH value of 7, place it in a constant temperature water bath shaker at 30°C and stir at a speed of 150 rpm for 2 hours. After the reaction is complete, filter and separate the solid-liquid mixture. The color method was used to analyze and test the phosphate concentration in the filtrate. The results showed that under the experimental conditions, the removal rates of calcite, hydroxyapatite and calcite-hydroxyapatite composites for phosphate in solution were 3.0%, 5.2%, ...

Embodiment 3

[0031] First, the solution precipitation method is used to synthesize hydroxyapatite (the steps are the same as in Example 1), and then the calcite with a particle size of 300 mesh and the hydroxyapatite with a particle size of 200 mesh are mixed according to a mass ratio of 15:1 to obtain calcite-hydroxyapatite Apatite composite adsorbent.

[0032] Add 0.3g calcite, 0.02g hydroxyapatite, and 0.32g calcite-hydroxyapatite composite to 25mL phosphate-containing PO 4 3- In a solution with a concentration of 50mg / L and a pH value of 7, place it in a constant temperature water bath shaker at 30°C and stir at a speed of 150 rpm for 2 hours. After the reaction is complete, filter and separate the solid-liquid mixture. The color method was used to analyze and test the phosphate concentration in the filtrate. The results showed that under the experimental conditions, the removal rates of calcite, hydroxyapatite and calcite-hydroxyapatite composite materials for phosphate in the solut...

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Abstract

The invention relates to the technical field of water quality purification and phosphoric waste water treatment and discloses a method for removing and recovering phosphate in waste water. The method comprises the following steps: feeding a calcite-hydroxyapatite composite material into waste water with the phosphate ion concentration being 10-500mg / L and the pH value being 3-10; and then oscillating or stirring the obtained solid-liquid mixture for 0.5-24 hours, wherein the usage ratio of the calcite-hydroxyapatite composite material to the waste water is 1-100g / L, and in the calcite-hydroxyapatite composite material, the weight ratio of calcite to hydroxyapatite is (1:1)-(100:1). In the method, the calcite-hydroxyapatite composite material is utilized as an adsorbent, so that the rate and the efficiency for removing and recovering the phosphate in the waste water are obviously higher than those under the condition that calcite is solely utilized as the adsorbent, thus rapidly and better realizing the removal of the phosphate in the waste water, shortening the hydraulic retention time of a reactor needed by a dephosphorization process, and lowering the constructing and operating costs of the dephosphorization process.

Description

technical field [0001] The invention belongs to the technical field of water purification and phosphorus-containing wastewater treatment, and relates to a method for removing and recovering phosphate in wastewater, in particular using calcite-hydroxyapatite composite material as an adsorbent to remove and recover phosphate in wastewater. Background technique [0002] Phosphorus is one of the nutrient elements necessary for the growth of phytoplankton in surface waters. When the concentration of phosphorus in the surface water is too high, it will lead to a large number of phytoplankton, which will cause the eutrophication of the surface water. It is generally believed that when the concentration of total phosphorus in surface water exceeds 0.02mg / L, eutrophication of surface water can be caused. Eutrophication will not only cause the surface water body to lose its due function, but also seriously affect the quality of human life, the living environment and the sustainable d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/28C02F1/58B01J20/04C01B25/26
Inventor 林建伟詹艳慧邢云青王春峰储鸣
Owner SHANGHAI OCEAN UNIV
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