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A modified molecular sieve adsorbent for ammonia nitrogen wastewater treatment and preparation method thereof

A technology of ammonia nitrogen wastewater and molecular sieve, which is applied in water/sewage treatment, adsorption water/sewage treatment, water/sludge/sewage treatment, etc., can solve the problems of unsatisfactory ammonia nitrogen adsorption rate and regeneration rate, and achieve favorable adsorption, The effect of improving the use intensity and reducing the loss rate

Active Publication Date: 2020-07-03
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Description
  • Claims
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Problems solved by technology

[0005] The present invention aims at the above-mentioned problem that the ammonia nitrogen adsorption rate and regeneration rate of the existing molecular sieve adsorbent are not ideal, and proposes a modified molecular sieve adsorbent for ammonia nitrogen wastewater treatment and a preparation method thereof. The modified molecular sieve adsorbent not only has a higher Ammonia nitrogen adsorption capacity, but also has a high ammonia nitrogen adsorption rate and regeneration rate

Method used

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  • A modified molecular sieve adsorbent for ammonia nitrogen wastewater treatment and preparation method thereof
  • A modified molecular sieve adsorbent for ammonia nitrogen wastewater treatment and preparation method thereof
  • A modified molecular sieve adsorbent for ammonia nitrogen wastewater treatment and preparation method thereof

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preparation example Construction

[0022] The embodiment of the present invention provides a method for preparing a modified molecular sieve adsorbent for ammonia nitrogen wastewater treatment, comprising the following steps:

[0023] S1: uniformly mix ZSM-5 molecular sieve with binder, cross-linking agent, pore-forming agent and water to obtain mixed raw materials; wherein, the binder is pseudo-boehmite, and the cross-linking agent is hydrochloric acid and A mixed acid of nitric acid, and the pore-forming agent is squash powder.

[0024] S2: extruding the mixed raw materials, and calcining at 600° C. for 5 hours to obtain a modified molecular sieve adsorbent.

[0025] In the above preparation method, it should be noted that the ZSM-5 molecular sieve is a molecular sieve with a high silicon-aluminum ratio, which belongs to the medium-pore zeolite, and its skeleton is composed of two kinds of intersecting pore systems. Ellipse, the major axis is Minor axis is The other is a "Z"-shaped transverse channel wit...

Embodiment 1

[0034] (1) Weigh 50g ZSM-5 molecular sieve, 10g pseudo-boehmite and 2g scallop powder, place them in a blender and stir and mix evenly; take hydrochloric acid and nitric acid mixed with a mass ratio of 2:3 as cross-linking agent, weigh 3g Dissolve the cross-linking agent in 18g of water, then add the mixed cross-linking agent and water into the mixer under stirring conditions, mix with ZSM-5 molecular sieve, binder and pore-forming agent, and stir until completely uniform to obtain the mixed raw material;

[0035] (2) Pour the above mixed raw materials into an extruder and knead them, apply external pressure to make them extrude from a porous mold, let them dry for 24 hours, put them in an oven at 103°C for 2 hours, and then place them in a muffle furnace The modified molecular sieve adsorbent was obtained by calcining at 600°C for 5 hours.

Embodiment 2

[0037] (1) Weigh 50g ZSM-5 molecular sieve, 15g pseudoboehmite and 2.5g scallop powder, place them in a blender and stir and mix evenly; use hydrochloric acid and nitric acid mixed with a mass ratio of 2:3 as a crosslinking agent, weigh Dissolve 3g of cross-linking agent in 20g of water, then add the mixed cross-linking agent and water into the mixer under stirring conditions, mix with ZSM-5 molecular sieve, binder and pore-forming agent, and stir until completely uniform to obtain a mixed raw material;

[0038] (2) Pour the above mixed raw materials into an extruder and knead them, apply external pressure to make them extrude from a porous mold, let them dry for 24 hours, put them in an oven at 103°C for 2 hours, and then place them in a muffle furnace The modified molecular sieve adsorbent was obtained by calcining at 600°C for 5 hours.

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Abstract

The invention proposes a modified molecular sieve adsorbent for treating ammonia nitrogen wastewater and a preparation method thereof, belonging to the technical field of adsorbents. The modified molecular sieve adsorbent not only has a relatively high ammonia nitrogen adsorption capacity, but also has a relatively high ammonia nitrogen adsorption rate and Regeneration rate, when it is used to treat ammonia nitrogen wastewater, the loss rate is small, and the treatment process is more efficient. The preparation method of the modified molecular sieve adsorbent for ammonia nitrogen wastewater treatment comprises the following steps: uniformly mixing ZSM-5 molecular sieve with binder, cross-linking agent, pore-forming agent and water to obtain mixed raw materials; wherein, the binder It is pseudo-boehmite, the cross-linking agent is a mixed acid of hydrochloric acid and nitric acid, and the pore-forming agent is squash powder; the mixed raw material is extruded and calcined at 600°C for 5 hours to obtain a modified molecular sieve Adsorbent.

Description

technical field [0001] The invention belongs to the technical field of adsorbents, in particular to a modified molecular sieve adsorbent for treating ammonia nitrogen wastewater and a preparation method thereof. Background technique [0002] my country is a country with poor water resources. In recent years, with the rapid development of my country's economic construction, water pollution has become increasingly serious. Among them, ammonia nitrogen wastewater pollution has become the main pollution source of surface water in my country. For example, when the ammonia nitrogen content in the water body is too high, it will cause the algae plants in it to multiply rapidly, form algal blooms, consume a large amount of dissolved oxygen in the water body, and cause water quality Deterioration, deterioration, blackening and smelly. At the same time, the ammonia nitrogen in the water body can be oxidized to nitrite nitrogen under the action of microorganisms, and the combination of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/30B01J20/18C02F1/28C02F101/16
CPCB01J20/18C02F1/281C02F2101/16
Inventor 陈爽张东生张晓敏徐红燕刘会娥范俊琦
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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