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Method for preparing modified water-purifying sludge ammonia nitrogen adsorbent

An adsorbent and water purification technology, applied in water/sludge/sewage treatment, water/sewage treatment, chemical instruments and methods, etc. The effect of improving adsorption effect, loose structure, and improving ammonia nitrogen removal rate

Inactive Publication Date: 2013-10-02
SUZHOU UNIV OF SCI & TECH
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  • Summary
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  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Ammonia nitrogen is another important pollutant of water eutrophication and environmental pollution. Entering the water body can cause water hypoxia, breed harmful aquatic organisms, and cause fish poisoning. Although the water purification sludge contains active components such as aluminum and iron, The adsorption of phosphorus in water can be successfully achieved through coordination exchange, co-precipitation, etc., but the effect of directly using it to adsorb ammonia nitrogen in water is poor.

Method used

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preparation example Construction

[0020] A preparation method of modified water purification sludge ammonia nitrogen adsorbent, comprising the following steps:

[0021] Step 1) Crushing and sieving the dehydrated and dried water purification sludge into sludge particles;

[0022] Step 2) Add 2mol / L sulfuric acid into the sludge particles, and react for 30-60 minutes under the action of ultrasonic waves;

[0023] Step 3) Put the reaction product to stand for stratification, take its sludge for precipitation, call it recovered sludge and dry it for later use;

[0024] Step 4) Add sodium silicate (control the silicon-aluminum ratio in the range of 6:1 to 20:1), sodium hydroxide aqueous solution (1.5mol / L to 2.5mol / L) into the recycled mud, and under the action of ultrasound (control The temperature is 80℃~100℃) for 30min~50min;

[0025] Step 5) centrifuging the reaction product, and taking its supernatant;

[0026] Step 6) Under the action of mechanical stirring, adjust the pH value of the supernatant to 6-8 w...

Embodiment 1

[0032] 1. In a three-necked flask, add 24 grams of air-dried sludge, 18 grams of sodium silicate, and 200 milliliters of a 2-molar sodium hydroxide solution. Under the action of ultrasound, keep the temperature between 80 and 100 ° C, and react 0.5 hours;

[0033] 2. Centrifuge the contents of the three-necked bottle, take the supernatant, adjust the pH value of the supernatant to 8 with concentrated sulfuric acid under mechanical stirring, and perform suction filtration to take the filter cake;

[0034] 3. Add 10 ml of distilled water to the filter cake, put it into a high-pressure reaction kettle lined with polytetrafluoroethylene, react at 105°C for 3 hours, take out the filter cake by suction filtration and put it in an evaporating dish, put it in an oven and dry it at 100°C Dry. The dried product is crushed to obtain the product.

[0035] 4. Mix the above-mentioned adsorbent product with a certain concentration of ammonia nitrogen solution in a certain proportion, shake...

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Abstract

The invention discloses a method for preparing a modified water-purifying sludge ammonia nitrogen adsorbent. The ammonia nitrogen adsorbent is prepared by taking water-purifying sludge from waterworks as a raw material and modifying the water-purifying sludge into a zeolite-like structure which has a loose structure, rich holes and the like. The ammonia nitrogen adsorbent is used for absorbing ammonia nitrogen. By the technical scheme, the ammonia nitrogen absorbing effect of the water-purifying sludge can be obviously improved, the ammonia nitrogen removal rate is greatly improved, and the ammonia nitrogen absorbing effect of the water-purifying sludge is approximate to that of commercial zeolite.

Description

technical field [0001] The invention relates to a preparation method of a modified water purification sludge ammonia nitrogen adsorbent. Background technique [0002] Ammonia nitrogen is another important pollutant of water body eutrophication and environmental pollution. Entering the water body can cause water hypoxia, breed harmful aquatic organisms, and cause fish poisoning. Although the water purification sludge contains active components such as aluminum and iron, The adsorption of phosphorus in water can be successfully achieved by means of coordination exchange and co-precipitation, but the effect of directly using it to adsorb ammonia nitrogen in water is poor. [0003] As a by-product of waterworks, water purification sludge contains a large amount of inorganic coagulant, so it is of great significance to reuse it as a resource. [0004] At present, zeolite and its modified products have become good adsorbents for removing ammonia nitrogen due to their loose struc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/06B01J20/08B01J20/30C02F1/28C02F1/58
Inventor 杨兰王东田王建黎魏杰宫钦德
Owner SUZHOU UNIV OF SCI & TECH
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