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Method for removing hydroxyapatite modified eggshell adsorbent material and recycling phosphate from wastewater

A technology of hydroxyapatite and adsorbent, applied in chemical instruments and methods, adsorption water/sewage treatment, water/sewage treatment, etc., to achieve the effect of low construction and operation costs and short hydraulic retention time

Inactive Publication Date: 2012-03-21
SHANGHAI OCEAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is no report on the removal and recovery of phosphate in water by hydroxyapatite-modified eggshells.

Method used

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  • Method for removing hydroxyapatite modified eggshell adsorbent material and recycling phosphate from wastewater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] (1) Remove the inner membrane of the eggshell, and wash the eggshell repeatedly with tap water, and then dry, crush and sieve the eggshell powder to obtain 200-mesh eggshell powder for use; the preparation concentrations are 1 mol / L, 0.6 mol / L and 0.8 mol / L Ca(NO 3 ) 2 , (NH 4 ) 2 HPO 4 and NH 3 ·OH solution for later use.

[0024] (2) Take 10 g of spare eggshell powder and place it in a 250 mL Erlenmeyer flask; add 20 mL of spare Ca(NO 3 ) 2 and (NH 4 ) 2 HPO 4 solution, and using NH 3 Adjust the pH of the solution to 9 with OH solution, centrifuge after stirring for 24 hours, wash the solid repeatedly with distilled water until the pH of the supernatant is close to 7, dry the solid at 105°C, and grind it through a 200-mesh sieve for backup The obtained solid is the hydroxyapatite modified eggshell adsorbent material.

[0025] (3) Weigh 0.200 g of the adsorbents prepared by the above method and place them in 20 mL of 25, 50 and 100 mg PO 4 3- / L of phosph...

Embodiment 2

[0029] (1) Remove the inner membrane of the eggshell, and wash the eggshell repeatedly with tap water, and then dry, crush and sieve the eggshell powder to obtain 200-mesh eggshell powder for use; the preparation concentrations are 1 mol / L, 0.6 mol / L and 0.8 mol / L Ca(NO 3 ) 2 , (NH 4 ) 2 HPO 4 and NH 3 ·OH solution for later use.

[0030] (2) Take 10 g of spare eggshell powder and place it in a 250 mL Erlenmeyer flask; add 20 mL of spare Ca(NO 3 ) 2 and (NH 4 ) 2 HPO 4 solution, and using NH 3 Adjust the pH of the solution to 9 with OH solution, centrifuge after stirring for 24 hours, wash the solid repeatedly with distilled water until the pH of the supernatant is close to 7, dry the solid at 105°C, and grind it through a 200-mesh sieve for backup The obtained solid is the hydroxyapatite modified eggshell adsorbent material.

[0031] (3) Weigh 0.200 g of the adsorbent prepared by the above method and place them in 25 mL of 100 mg PO 4 3- / L, the phosphate solutio...

Embodiment 3

[0033] (1) Remove the inner membrane of the eggshell, and wash the eggshell repeatedly with tap water, and then dry, crush and sieve the eggshell powder to obtain 200-mesh eggshell powder for use; the preparation concentrations are 1 mol / L, 0.6 mol / L and 0.8 mol / L Ca(NO 3 ) 2 , (NH 4 ) 2 HPO 4 and NH 3 ·OH solution for later use.

[0034] (2) Take 10 g of spare eggshell powder and place it in a 250 mL Erlenmeyer flask; add 20 mL of spare Ca(NO 3 ) 2 and (NH 4 ) 2 HPO 4 solution, and using NH 3 Adjust the pH of the solution to 9 with OH solution, centrifuge after stirring for 24 hours, wash the solid repeatedly with distilled water until the pH of the supernatant is close to 7, dry the solid at 105°C, and grind it through a 200-mesh sieve for backup The obtained solid is the hydroxyapatite modified eggshell adsorbent material.

[0035] (3) Weigh 0.050, 0.100 and 0.200 g of the adsorbents prepared by the above method, respectively, and place them in 25 mL of 100 mg P...

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Abstract

The invention relates to a hydroxyapatite modified eggshell adsorbent material as well as a preparation method and an application thereof. The invention also provides a method for removing the hydroxyapatite modified eggshell adsorbent material and recycling phosphate from wastewater. The invention has the advantages that: the speed of removing phosphate from the wastewater of the hydroxyapatite modified eggshell serving as an adsorbent is obviously higher than the speed of removing phosphate from the wastewater by using eggshell only; through the phosphorous removing process taking the hydroxyapatite modified eggshell as the adsorbent, the hydraulic retention time of a reactor is shorter, and the construction and operation cost is lower; the eggshell and hydroxyapatite do not release harmful ions in the phosphorous removing process, thereby avoiding the risk of secondary pollution on the water and protecting the environment.

Description

technical field [0001] The invention relates to an adsorbent material and a method for removing and recovering phosphate in waste water, in particular to a hydroxyapatite-modified eggshell adsorbent material and a method for removing and recovering phosphate in waste water. Background technique [0002] Phosphorus is one of the main causes of eutrophication in surface water, and the discharge of a large amount of phosphorus-containing wastewater will aggravate the eutrophication of surface water. 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 development of social economy. Therefore, the effective removal of phosphorus in wastewater is of great significance for controlling the eutrophication of surface water bodies. At present, the removal methods of phosphorus in wastewater mainly include biological methods, chemical coagulation methods and a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/24B01J20/30C02F1/28C02F1/58
Inventor 林建伟詹艳慧邢云青孙艳丽李佳
Owner SHANGHAI OCEAN UNIV
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