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Preparation method for adsorbent capable of removing nitrogen and phosphorus simultaneously

A simultaneous nitrogen and phosphorus removal and adsorbent technology, applied in chemical instruments and methods, adsorption water/sewage treatment, water/sludge/sewage treatment, etc., can solve problems such as dust generation, air pollution, biological hazards, etc., to achieve Effects of increased adsorption rate, improved performance, and improved adsorption performance

Active Publication Date: 2017-05-03
SOUTH CHINA INST OF ENVIRONMENTAL SCI MEP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In 2009, my country's fly ash discharge amounted to 375 million tons. If a large amount of fly ash is not treated, it will generate dust and pollute the atmosphere; if it is discharged into the water system, it will cause river silting, and the toxic chemicals in it will also harm the human body and organisms. cause harm
[0004] At present, there have been many studies on the modification of fly ash synthetic zeolite, but the effect is not very satisfactory. Therefore, more in-depth research is needed

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A method for preparing an adsorbent for simultaneous denitrification and phosphorus removal, comprising the following steps:

[0022] 1) Fly ash pretreatment: Put the fly ash mixed with high-calcium fly ash and low-calcium fly ash at a weight ratio of 1:0.2 into a 3.5mol / L hydrochloric acid solution, with a solid-to-liquid ratio of 1:1 , carry out magnetic stirring for 2 hours, control the temperature at 90°C, then wash with deionized water once to neutral, and dry at 110°C until the water content is less than 5%, to obtain pretreated fly ash;

[0023] 2) Preparation of fly ash synthetic zeolite: pulverize the pretreated fly ash to particles of 10 μm and put it into an alkaline activator containing 30wt% NaOH, 10wt% KOH and 3wt% NaOH 2 SO 4 ; The ratio of material to liquid is 1:50g / ml; Microwave is used for heating, and the microwave heating power is 400w, aged at 83°C for 1 hour, then left to stand for crystallization for 3 hours, filtered, washed, and dried to obtai...

Embodiment 2

[0028] A method for preparing an adsorbent for simultaneous denitrification and phosphorus removal, comprising the following steps:

[0029] 1) Fly ash pretreatment: put the fly ash mixed with high-calcium fly ash and low-calcium fly ash at a weight ratio of 1:2.6 into 4.25mol / L hydrochloric acid solution, and the solid-to-liquid ratio is 1:1.1 , carry out magnetic stirring for 2.25h, the temperature is controlled at 90°C, then wash with deionized water three times to neutral, and dry at 110°C until the water content is less than 5%, to obtain pretreated fly ash;

[0030] 2) Preparation of fly ash synthetic zeolite: pulverize the pretreated fly ash to particles of 55 μm, and put it into the alkaline activator, which contains 37.5wt% NaOH, 11wt% KOH and 4.5wt% KOH %Na 2 SO 4 ; The ratio of material to liquid is 1:125g / ml; microwave is used for heating, and the microwave heating power is 475w, aged at 83°C for 5 hours, then left to stand for crystallization for 6 hours, filter...

Embodiment 3

[0035] A method for preparing an adsorbent for simultaneous denitrification and phosphorus removal, comprising the following steps:

[0036] 1) Fly ash pretreatment: Put the fly ash mixed with high-calcium fly ash and low-calcium fly ash in a weight ratio of 1:5 into a 5mol / L hydrochloric acid solution, the solid-to-liquid ratio is 1:1.2, Perform magnetic stirring for 2.5 hours, control the temperature at 90°C, then wash with deionized water for 5 times until neutral, dry at 110°C until the water content is less than 5%, and obtain pretreated fly ash; among them, high calcium fly ash The content of CaO in the fly ash is 35%, and the content of CaO in the low-calcium fly ash is 10%;

[0037] 2) Preparation of fly ash synthetic zeolite: pulverize the pretreated fly ash to particles of 100 μm and put it into an alkaline activator containing 45wt% NaOH, 12wt% KOH and 6wt% NaOH 2 SO 4 ; The ratio of material to liquid is 1:200g / ml; microwave is used for heating, and the microwave...

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Abstract

The invention discloses a preparation method for an adsorbent capable of removing nitrogen and phosphorus simultaneously. The preparation method comprises the following steps of (1) fly ash pretreatment, (2) preparation of zeolite synthesized from fly ash, (3) rare earth element modifier preparation, and (4) adsorbent preparation. According to the preparation method, by using the zeolite synthesized from the fly ash, salts with alkaline-earth elements are added in the alkalization treatment process of the fly ash, and the performance of the zeolite synthesized from the fly ash is improved; two rare earth elements of lanthanum and gadolinium are added into a rare earth modifier prepared from ethylene glycol and polyvinylpyrrolidone so that the zeolite synthesized from the fly ash can be subjected to modification treatment; and compared with methods that modification is conducted by using lanthanum chloride independently in the prior art, the performance for adsorbing ammonium ions and phosphorus is greatly improved and reaches 93% or above, in addition, the adsorption rate is also greatly increased, and the quite good practical application value is achieved.

Description

technical field [0001] The invention relates to the technical field of sewage treatment, in particular to a method for preparing an adsorbent for synchronous nitrogen and phosphorus removal. Background technique [0002] Fly ash is the fine ash collected from the flue gas after coal combustion. Fly ash is the main solid waste discharged from coal-fired power plants. With the development of the power industry, the discharge of fly ash from coal-fired power plants has increased year by year, becoming one of the largest industrial wastes in my country. In 2009, my country's fly ash discharge amounted to 375 million tons. A large amount of fly ash will generate dust and pollute the atmosphere if it is not treated. cause harm. The total utilization of fly ash has been paid more and more attention by the country, and great achievements have been made in recent years. To sum up, fly ash is mainly used in several aspects such as building materials, construction engineering, road c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/18B01J20/30C02F1/28
CPCB01J20/12B01J20/14B01J20/186C02F1/281
Inventor 骆其金谌建宇赖后伟庞志华刘钢魏东洋黄荣新王振兴林伟仲
Owner SOUTH CHINA INST OF ENVIRONMENTAL SCI MEP
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