Method for preparing modified coal ash phosphorus sorbent and uses thereof

A technology of phosphorus adsorbent and fly ash, which is applied in the direction of chemical instruments and methods, adsorption water/sewage treatment, and other chemical processes, can solve the problems of poor phosphorus removal effect, improve the ability of physicochemical phosphorus absorption, and strongly remove Phosphorus efficiency, high phosphorus removal efficiency

Inactive Publication Date: 2009-03-04
ZHENGZHOU UNIVERSITY OF AERONAUTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Chinese patent 03110906.3 discloses a modified fly ash adsorbent, which is prepared by mixing fly ash and dilute sulfuric acid and activating at a certain temperature for a certain period of time. It is used to treat wastewater. Has a certain removal of COD cr and chroma, but the phosphorus removal effect is not good. After specific tests, the phosphorus removal effect is only 22.13%

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] The raw material is taken from a power plant fly ash, mix 5g fly ash with 2ml water evenly, add 0.3ml 98% concentrated sulfuric acid, stir and mix evenly, mature at 100°C for 2 hours, the material will be made into powder after cooling Active phosphorus adsorbent.

[0021] Phosphorus removal experiments were carried out using the phosphorus adsorbent prepared by the above process. The phosphorus content of the water sample used is 60mg / L. Take 1.25g of phosphorus adsorbent into 125ml of water, adjust the pH value to 7.0, and shake at 25°C for 1 hour. The purification rate of phosphorus in water by modified fly ash is 97.18%, and the residual concentration of phosphorus in water after purification is 1.69mg / L. Under the same operating conditions, the purification rate of phosphorus in water by unmodified fly ash is 4.37%, and the residual concentration of phosphorus in the purified solution is 57.37mg / L.

Embodiment 2

[0023] The raw material is from a power plant fly ash, mix 5g fly ash with 1.5ml water evenly, add 0.3ml 98% concentrated sulfuric acid, stir and mix evenly, and mature at room temperature for 2 hours to obtain a powdery highly active phosphorus adsorbent .

[0024] Phosphorus removal experiments were carried out using the phosphorus adsorbent prepared by the above process. The phosphorus content of the water sample used is 60mg / L. Take 1.25g of phosphorus adsorbent into 125ml of water, adjust the pH value to 7.0, and shake at 25°C for 1 hour. The purification rate of phosphorus in water by modified fly ash is 86.35%, and the concentration of phosphorus in the purified solution is 8.19mg / L.

Embodiment 3

[0026] The raw material is from a power plant fly ash, mix 5g fly ash with 1.5ml water evenly, add 0.3ml 98% concentrated sulfuric acid, stir and mix evenly, mature at 100°C for 1.5 hours, the material will be made into powder after cooling Highly active phosphorus adsorbent.

[0027] Phosphorus removal experiments were carried out using the phosphorus adsorbent prepared by the above process. Add 1.25 g of modified fly ash to each of the five phosphorus-containing solutions with a volume of 125 ml and a concentration of 70 mg / L to adjust the pH to 7.0. Shake at 25°C for 5, 15, 30, 60, and 90 minutes respectively, and the purification efficiency of modified fly ash for phosphorus at different times is 92.21%, 92.28%, 92.32%, 92.44%, and 92.44%.

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Abstract

A preparation method for modified fly ash phosphor absorbent and application thereof is characterized in that uniformly mixing fly ash and water firstly; adding sulfuric acid with the thickness of 98%, and the weight ratio of the fly ash, the water and sulfuric acid is 100: (6-10): (2-50), and stirring uniformly; and at last curing for 0.5 to 5 hours at the temperature of 20 to 300 DEG C and getting the modified fly ash phosphor absorbent. The invention has the creative characteristics of making use of low-cost sulfuric aid modifier to largely dissolve substances with phosphor absorbing potential and further improving the surface area of the fly ash, thereby getting the absorbent with relatively high phosphor removing ability and maximally playing the phosphor removing potential of the fly ash. The invention eliminates the working procedures such as high-temperature roasting, acid solution and alkaline solution extraction, filtering, drying, etc. which are commonly used in fly ash modifying process, thereby realizing simple technology. The absorbent has relatively high speed of phosphor absorbing when put into sewage, and the maximum purification effect can be achieved in 5 minutes.

Description

technical field [0001] The invention relates to a preparation method of a modified fly ash phosphorus adsorbent, which is a method for preparing an adsorbent for removing phosphorus in water by taking industrial waste fly ash as a raw material. The invention belongs to the technical field of solid waste comprehensive utilization and water treatment. Background technique [0002] With the increase of human development and utilization of environmental resources and the acceleration of industrial and agricultural production scale, more and more nutrients enter rivers and lakes, resulting in eutrophication of water bodies. The resulting eutrophication of lakes and rivers has become a major environmental problem facing our country. When the total phosphorus content in slow-flowing water bodies such as lakes and reservoirs exceeds 0.02mg / L, blue-green algae blooms may break out. Studies have shown that the growth rate of algal plants in water bodies is closely related to phospho...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/02B01J20/30C02F1/28
Inventor 许可刘军坛彭伟功李见云王香平刘蕾姜灵彦
Owner ZHENGZHOU UNIVERSITY OF AERONAUTICS
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