Preparation method of membrane adsorbent for removing ammonia nitrogen in wastewater

A membrane adsorption and ammonia nitrogen technology, applied in chemical instruments and methods, adsorption water/sewage treatment, membrane technology, etc., to achieve stable mechanical and thermodynamic properties, increase porosity, and reduce solvent resistance

Inactive Publication Date: 2015-11-11
SUZHOU UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It has been reported that using resins with adsorption functions, molecular sieves, calcium carbonate, clay, etc. as inorganic filler materials can prepare membrane adsorbents for removing heavy metal ions, ammonium ions and other pollutants in wastewater. Currently, water purification sludge is used for Research in this area has not yet been reported

Method used

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  • Preparation method of membrane adsorbent for removing ammonia nitrogen in wastewater

Examples

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preparation example Construction

[0016] The modified water purification sludge used in embodiment 1-5 is prepared by the following method:

[0017] 1. In a three-necked flask, add 24g of dried water purification sludge, 18g of sodium silicate, and 200mL of 2mol / L sodium hydroxide solution. h;

[0018] 2. Centrifuge the contents of the three-necked bottle, take its supernatant, adjust the pH value of the supernatant to 8 with concentrated sulfuric acid under mechanical stirring, then perform suction filtration, and take its filter cake;

[0019] 3. Add 10mL of distilled water to the filter cake, put it into a high-pressure reactor 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, and dry it in an oven at 100°C. The modified water purification sludge is obtained.

[0020] The water purification sludge used is taken from the Suzhou New District Waterworks.

Embodiment 1

[0022] A preparation method of a membrane adsorbent for removing ammonia nitrogen in waste water, the preparation steps are as follows:

[0023] (1) Treatment of modified water purification sludge: Grinding, crushing and sieving the modified water purification sludge to produce ultrafine sludge particles with an average particle size of 1 μm;

[0024] (2) Preparation of casting solution: Add 0.9g polyvinylpyrrolidone into a conical flask containing 23.7mL dimethylacetamide, mix and stir evenly, add 3.78g polyvinylidene fluoride after the polyvinylpyrrolidone dissolves, keep The temperature is 50-70°C. After polyvinylidene fluoride is dissolved, add 1.62g of the above sludge particles (polyvinylidene fluoride / modified water purification sludge particles=7:3), stir for 6 hours, and seal with plastic wrap bottle mouth, stand for degassing for 24 hours to obtain the casting solution;

[0025] (3) Preparation of membrane adsorbent: Control the temperature of the glass plate at 25°...

Embodiment 2

[0028] A preparation method of a membrane adsorbent for removing ammonia nitrogen in waste water, the preparation steps are as follows:

[0029] (1) Treatment of modified water purification sludge: Grinding, crushing and sieving the modified water purification sludge to produce ultrafine sludge particles with an average particle size of 1 μm;

[0030] (2) Preparation of casting solution: Add 0.9g polyvinylpyrrolidone into a conical flask containing 23.7mL dimethylacetamide, mix and stir evenly, add 3.24g polyvinylidene fluoride after the polyvinylpyrrolidone dissolves, keep The temperature is 50-70°C. After polyvinylidene fluoride is dissolved, add 2.16g of the above sludge particles (polyvinylidene fluoride / modified water purification sludge particles=6:4), stir for 6 hours, and seal with plastic wrap bottle mouth, stand for degassing for 24 hours to obtain the casting solution;

[0031] (3) Preparation of membrane adsorbent: Control the temperature of the glass plate at 25°...

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Abstract

The invention provides a preparation method of a membrane adsorbent for removing ammonia nitrogen in wastewater. The preparation method comprises the following steps: treating modified pure water sludge; adding polyvinylpyrrolidone into a tapered bottle containing dimethyl acetamide; adding polyvinylidene fluoride after uniformly stirring; re-adding pure water sludge after dissolution; after fully stirring, sealing the bottle mouth and leaving the mixture to stand for defoaming to prepare a casting solution, wherein the addition of polyvinylpyrrolidone accounts for 2-4% of the mass of the casting solution, the total mass of polyvinylidene fluoride and sludge particles accounts for 17-20% of the mass of the casting solution, the mass ratio of polyvinylidene fluoride to the sludge particles is (3:7)-(7:3), and the rest is dimethyl acetamide; striking the casting solution on a glass plate to manufacture a flat sheet membrane; then placing the flat sheet membrane in a pure water precipitating bath; soaking in deionized water after film forming, and then taking out; placing the membrane in anhydrous ethyl alcohol to be soaked; taking out the membrane; naturally cooling to obtain the membrane adsorbent. The membrane adsorbent can absorb ammonia nitrogen in water and is renewable.

Description

technical field [0001] The invention belongs to the field of waste water treatment, in particular to a preparation method of a membrane adsorbent for removing ammonia nitrogen in waste water. Background technique [0002] Water purification sludge is a by-product of tap water production, and its resource reuse is of great significance. Ammonia nitrogen is an important pollutant that causes eutrophication of water bodies and environmental pollution. When it enters water bodies, it can make water bodies lack oxygen and breed harmful aquatic organisms. Modification of water purification sludge can effectively adsorb ammonia nitrogen pollutants in wastewater. For example, the Chinese invention patent (patent number 201310308975.6, application date 2013.07.23) discloses a preparation method of a modified ammonia nitrogen adsorbent for water purification sludge. The water purification sludge was modified into a zeolite-like structure with loose structure and abundant pores and u...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/12B01D71/34B01D67/00B01J20/26C02F1/28C02F1/44
Inventor 杨兰王东田魏杰宫钦德
Owner SUZHOU UNIV OF SCI & TECH
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