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Modified zeolite adsorbent for removing ammonia nitrogen and phosphate in water, and preparation and regeneration method thereof

An adsorbent and phosphate technology, applied in the field of water treatment, can solve the problems of poor phosphorus adsorption, inability to regenerate multiple times, poor regeneration performance, etc., and achieve the improvement of poor regeneration performance, cost savings, and large cavitation bubbles. Effect

Inactive Publication Date: 2016-03-09
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Compared with synthetic zeolites, natural zeolites are cheap and easy to obtain, but have low crystallinity and poor regeneration performance
Using the cation exchange performance of natural zeolite to remove ammonia nitrogen has been widely concerned by researchers at home and abroad. Through simple modification methods such as salt, high temperature, and alkali treatment, a modified zeolite with better performance in removing ammonia nitrogen has been obtained, but there are still problems. Disadvantages of multiple regeneration
Since phosphorus mainly exists in the form of anions in water, there is electrostatic repulsion between the negatively charged zeolite framework, so the adsorption effect of natural zeolite on phosphorus is not good.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] (1) Screen and grind the zeolite particles, crush them to 100-200 mesh, wash with deionized water and dry at 100°C;

[0024] (2) Prepare a sodium chloride modifier solution with a sodium ion content of 1.0mol / L;

[0025] (3) After mixing the zeolite powder treated in step (1) with the modifier solution prepared in step (2), perform ion exchange under magnetic stirring for 24 hours. The weight ratio of zeolite powder to sodium chloride modifier solution is 1:20;

[0026] (4) After the mixture obtained in step (3) is left to settle, the solid is taken out, washed, dried, and ground into powder;

[0027] (5) Use ZrOCl 2 ·8H 2 O preparation zirconium ion content is the modifying agent solution of 0.02mol / L;

[0028] (6) After mixing the solid powder treated in step (4) with the zirconium modifier solution prepared in step (5), after magnetic stirring for 2 hours, adding NaOH solution to adjust the pH value to 10;

[0029] (7) Ultrasonic modification is performed on the...

Embodiment 2

[0034] (1) Screen and grind the zeolite particles, crush them to 100-200 mesh, wash with deionized water and dry at 90°C;

[0035] (2) Prepare a sodium chloride modifier solution with a sodium ion content of 0.05mol / L;

[0036] (3) After mixing the zeolite powder treated in step (1) with the modifier solution prepared in step (2), perform ion exchange for 48 hours under magnetic stirring. The weight ratio of zeolite powder to sodium chloride modifier solution is 1:5;

[0037] (4) After the mixture obtained in step (3) is left to settle, the solid is taken out, washed, dried, and ground into powder;

[0038] (5) Use ZrO(NO 3 ) 2 2H 2 O preparation zirconium ion content is the modifying agent solution of 0.2mol / L;

[0039] (6) After mixing the solid powder treated in step (4) with the modifier solution prepared in step (5), after magnetic stirring for 5 hours, add NaOH solution to adjust the pH value to 12;

[0040] (7) Ultrasonic modification of the mixture obtained in st...

Embodiment 3

[0045] (1) Screen and grind the zeolite particles, crush them to 100-200 mesh, wash with deionized water and dry at 150°C;

[0046] (2) Prepare a sodium chloride modifier solution with a sodium ion content of 2.0mol / L;

[0047] (3) After mixing the zeolite powder treated in step (1) with the modifier solution prepared in step (2), perform ion exchange for 2 hours under magnetic stirring. The weight ratio of zeolite powder to sodium chloride modifier solution is 1:50;

[0048] (4) After the mixture obtained in step (3) is left to settle, the solid is taken out, washed, dried, and ground into powder;

[0049] (5) Use ZrO(NO 3 ) 2 2H 2O preparation zirconium ion content is the modifying agent solution of 0.1mol / L;

[0050] (6) After mixing the solid powder treated in step (4) with the zirconium modifier solution prepared in step (5), after magnetically stirring for 0.5 h, adding NaOH solution to adjust the pH value to 9;

[0051] (7) Ultrasonic modification is performed on ...

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Abstract

The invention belongs to the technical field of water treatment, and specifically relates to a modified zeolite adsorbent capable of removing ammonia nitrogen and phosphate in water at the same time, and a preparation and regeneration method thereof. Cheap natural zeolite is modified by a sodium chloride solution, the contents of calcium and magnesium in zeolite are reduced, the ion exchange performance of zeolite on ammonia nitrogen is improved at the same time; then zirconium is loaded on the zeolite through a precipitation method, and zirconium has a specific adsorbing performance on phosphor, so the adsorption performance of zeolite on phosphate is improved. Cheap zeolite is adopted and modified through a simple modification method to prepare a bifunctional adsorbent capable of adsorbing ammonia nitrogen and phosphate at the same time. Moreover, through a provided regeneration liquid, the used modified zeolite adsorbent can be regenerated, the zeolite adsorbent can be effectively used repeatedly, and the adsorbent has a good application prospect.

Description

technical field [0001] The invention belongs to the technical field of water treatment, and in particular relates to a modified zeolite adsorbent for removing ammonia nitrogen and phosphate in water and a preparation and regeneration method thereof. Background technique [0002] With the continuous development of social economy, a large amount of industrial wastewater and domestic sewage containing nitrogen and phosphorus are discharged into rivers and lakes, which can easily cause eutrophication of the water body, cause excessive algae reproduction, and rapidly accelerate the consumption of dissolved oxygen in the water. Humans and other living things died in large numbers. Commonly used methods for removing phosphorus and nitrogen from wastewater include chemical precipitation, biological methods, chemical adsorption and ion exchange methods, etc. The adsorption method and ion exchange method have the advantages of simple process, good elimination effect, and small footpr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/16B01J20/34C02F1/28C02F1/58
Inventor 沈伟胡佩雷徐华龙孙文杰刘俊池赵培秦枫
Owner FUDAN UNIV
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