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Method for removing nitrogen and phosphorus in sewage by zeolite synthesized by coal ash

A technology for synthesizing zeolite and fly ash, which is applied in water/sewage treatment, chemical instruments and methods, adsorbed water/sewage treatment, etc. Improved removal rate, lower production costs and lower operating costs

Active Publication Date: 2011-10-19
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Moreover, the chemical composition and characteristics of different fly ash are different, and the properties of zeolites made from different fly ash are also different. According to the properties of sewage, how to choose different fly ash to synthesize zeolite to achieve effective removal The purpose of the pollutant has so far remained unreported

Method used

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  • Method for removing nitrogen and phosphorus in sewage by zeolite synthesized by coal ash
  • Method for removing nitrogen and phosphorus in sewage by zeolite synthesized by coal ash
  • Method for removing nitrogen and phosphorus in sewage by zeolite synthesized by coal ash

Examples

Experimental program
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Effect test

Embodiment 1

[0017] Example 1 Preparation of low calcium fly ash synthetic zeolite material

[0018] This embodiment utilizes low-calcium fly ash to synthesize zeolite, and the main component of low-calcium fly ash is: SiO 2 48.48%, Al2 o 3 34%, Fe 2 o 3 3.1%, CaO 4.11%. The alkaline activator adopts calcium carbonate. Weigh 1kg of low-calcium fly ash and 1.4kg of sodium carbonate, mix the low-calcium fly ash and sodium carbonate evenly, put them in a muffle furnace and roast at 600°C for 3 hours, take out the samples and cool them, and crush them with a pulverizer , the pulverized sample is mixed with water, the mixing ratio is 1:4, the mixed suspension is stirred at 50°C for 3h to prepare silica-alumina gel, the prepared silica-alumina gel is put into a reaction kettle, and crystallized at 100°C for 9h After the sample was taken out, it was washed with distilled water until the pH of the washing liquid was 9, and after the washed sample was dried, it was ground to synthesize zeolite...

Embodiment 2

[0019] Example 2 Preparation of high calcium fly ash synthetic zeolite material

[0020] This embodiment utilizes high-calcium fly ash to synthesize zeolite, and the main component of high-calcium fly ash is: SiO 2 30.76%, Al 2 o 3 14.31%, Fe 2 o 3 10.27%, CaO 37.55%. Alkaline activator uses sodium hydroxide. Weigh 7.5kg of high-calcium fly ash, then weigh 9kg of sodium hydroxide, mix the high-calcium fly ash and sodium hydroxide evenly, put them in a muffle furnace and roast at 550°C for 2 hours, take out the sample and cool it, and use a pulverizer to Pulverize it, mix the pulverized sample with water, the mixing ratio is 1:5, stir the mixed suspension at 80°C for 1h to prepare silica-alumina gel, put the obtained silica-alumina gel into the reaction kettle, and heat it at 100°C The crystallization was carried out for 16 hours. After the sample was taken out, it was washed with distilled water until the pH of the washing solution was 9. After the washed sample was drie...

Embodiment 3

[0021] Example 3 Nitrogen removal effect of low calcium fly ash synthetic zeolite

[0022] The sewage in this embodiment adopts simulated waste water, only containing ammonium ion (NH 4 + -N), using ammonium chloride (analytical pure) configuration. The ammonia root concentration of the wastewater is 10mg / L, and the pH is 6.7. Take 0.1g of low-calcium fly ash synthetic zeolite and put it into 25mL of simulated wastewater, and stir it rapidly for 1h. After solid-liquid separation, the ammonium root concentration in the supernatant is 2.23mg / L, the removal rate of ammonia nitrogen is 78.7%, and the adsorption capacity of ammonia nitrogen is 1.97 mg / g.

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Abstract

The invention provides a method for removing nitrogen and phosphorus in sewage by zeolite synthesized by coal ash. Low-calcium coal ash and high-calcium coal ash are respectively used as raw materials so as to synthesize zeolite with different removing effects by alkali fusion method. The zeolite synthesized by the low-calcium coal ash is adopted for processing ammonia nitrogen-contained sewage, the zeolite synthesized by the high-calcium coal ash is adopted for processing phosphorus-contained sewage, and the zeolite synthesized by the low-calcium ash coal and high-calcium ash coal with different mixing ratios is adopted for processing mixture sewage with different nitrogen and phosphorus ratios. In the invention, the prepared zeolite has high purity, different types of zeolite can be adopted according to sewage properties, the pollutant absorbing amount is large, and the solid adding amount in the practical application is reduced effectively. After absorbing nitrogen and phosphorus, the sludge can be used as fertilizer, so that not only the environmental pollution problems caused by waste solid coal ash, nitrogen and phosphorus in sewage and the like are solved, but also the reclamation in the pollutant is realized. According to the technology, the operation is simple, the running cost is low, and the method can be applied to industrial point source, plane source and nitrogen and phosphorus treatment in tail water of sewage treatment plants in cities and towns.

Description

Technical field: [0001] The invention relates to a method for removing nitrogen and phosphorus in sewage by synthesizing zeolite with fly ash, and belongs to the technical field of solid waste comprehensive utilization and water treatment. Background technique: [0002] In recent years, due to the intensification of human activities, a large amount of pollutants such as nitrogen and phosphorus have been discharged into water bodies, resulting in increasingly serious eutrophication of receiving water bodies. The eutrophication of the water body also promotes the abnormal reproduction of blue-green algae and other aquatic plants, the transparency of the water body decreases, the dissolved oxygen content decreases, a large number of aquatic organisms die, and the water quality deteriorates, which affects the normal service function of the water body and even threatens the safety of water supply. A large number of previous studies and practices have shown that in order to contro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B37/00C01B39/02B01J20/16B01J20/30C02F1/28C02F1/58
Inventor 张化永张木兰徐丹张璐怡吴文思王芳
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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