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Method for removing phosphorus in water by adopting aluminum salt modified eggshell

A water removal and modification technology, applied in chemical instruments and methods, water/sewage treatment, adsorption water/sewage treatment, etc., can solve the problems of dissolution of harmful ions, secondary pollution, etc., to increase the active sites of aluminum base, improve Effect of electrostatic force and adsorption capacity improvement

Active Publication Date: 2010-12-15
常熟紫金知识产权服务有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Iron slag, as an industrial waste, is cheap and has shown a good phosphorus treatment effect in long-term practical use. However, in the process of water treatment, the use of scrap iron slag will dissolve harmful ions into the water, causing secondary pollution.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] The method for removing phosphorus in water by modifying eggshells with aluminum salts comprises the following steps:

[0020] 1. Pretreatment of waste eggshells:

[0021] The recovered discarded eggshells are cleaned to remove the inner membrane. After drying the eggshells, grind them and pass through a 100-mesh sieve. Dry the egg shell powder with a particle size of less than 100 mesh at 105°C and put it in a desiccator for later use.

[0022] 2. Modification of discarded eggshells:

[0023] At a temperature of 25°C, to 20mL of 0.25mol / L AlCl 3 Add 4 g of pretreated eggshell powder to the solution and stir it. After 24h, filter and wash with distilled water. Finally put into an oven, dry at 105°C, and pass through a 100-mesh sieve.

[0024] 3. Phosphorus removal of modified eggshells:

[0025] Add 0.1g of modified eggshell powder into 100mL phosphorus-containing solution with a concentration of 15mg(P) / L, adjust the pH of the phosphorus solution to 7 with NaOH ...

Embodiment 2

[0027] Basically the same as Example 1, only AlCl 3 The modification temperature of the solution to the discarded eggshell was changed to 60°C, and the phosphorus adsorption capacity of the modified eggshell powder was 4.20 mg(P) / g.

Embodiment 3

[0029] Essentially the same as in Example 1, using 12.5mL of 0.4mol / L Al 2 (SO 4 ) 3 The solution was used to modify the discarded eggshell, and the phosphorus adsorption capacity of the modified eggshell powder was 4.23mg(P) / g.

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Abstract

The invention discloses a method for removing phosphorus in water by adopting an aluminum salt modified eggshell, belonging to the field of phosphoric sewage treatment. The method comprises the following steps of: waste eggshell modification: mixing 0.1-0.4mol / L of aluminum salt solution with pretreated eggshell powder at the temperature of 20-60 DEG C to lead the ratio of the amount of substance of aluminum salt to the mass of the eggshell powder is 0.001-0.0015mol / g, and then carrying out continuous stirring; stirring for 24h and then filtering, and drying at the temperature of 100-105 DEG C, and sieving by 100 meshes to obtain modified eggshell powder; putting the modified eggshell powder in a dryer for later use; and modified eggshell adsorption: adding 0.1-1g of modified eggshell powder to 100mL phosphoric solution with the concentration of 0.2-50mg (P) / L and the pH of 3-10, carrying out constant temperature shaking at the temperature of 10-40 DEG C at the speed of 50-200r / min; and filtering with a 0.45mum filter membrane after 10min-6h.

Description

1. Technical field [0001] The invention relates to a method for removing phosphorus in water by modifying eggshells with aluminum salts, and belongs to the field of phosphorus-containing sewage treatment. 2. Background technology [0002] The increasingly frequent human activities have reduced the directly available phosphorus resources, while the phosphorus concentration in rivers, lakes and other water bodies has been increasing. Phosphorus added to water body weight causes algae and other organisms to grow continuously, causing eutrophication of water bodies. The eutrophication of water body has a great impact on human production and life, so various phosphorus removal technologies and methods have been produced, but these methods have more or less shortcomings, which makes it difficult to find efficient, clean and cheap phosphorus removal method has become a hot spot in water treatment. [0003] There are many ways to treat phosphorus in water, and biological methods h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/28C02F1/58B01J20/04
Inventor 郭照冰陈天董琼元周飞陈天蕾郑正
Owner 常熟紫金知识产权服务有限公司