Natural zeolite multifunctional modification method for improving ammonia nitrogen removal rate of water body

A technology of ammonia nitrogen removal rate and natural zeolite, which is applied in the field of multifunctional modification of natural zeolite, can solve problems such as damage, secondary pollution, and waste of resources, and achieve the effects of improving ion exchange capacity, sufficient modification, and reducing the ratio of silicon to aluminum

Pending Publication Date: 2020-04-24
CHINA JILIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Solution impregnation needs to strictly control the concentration and time of impregnation, otherwise excessive impregnation will destroy the original pore structure and cause waste of resources
Most of the current research focuses on the single-functional modification of zeolite, and there are few reports on multi-functional combined modification, and the modified zeolite needs to be washed to remove the influence of anions, which brings significant secondary pollution problems

Method used

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  • Natural zeolite multifunctional modification method for improving ammonia nitrogen removal rate of water body

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] The natural zeolite is crushed and sieved to obtain zeolite particles with a mesh size of 20-50 mesh. Ultrasonic cleaning was performed for 20 minutes under the conditions of a power of 300W and a solid-to-liquid ratio of zeolite to water of 1g:20mL. Mix the pretreated zeolite with 0.20mol / L sodium metaaluminate solution at a solid-to-liquid ratio of 1g:10mL, and impregnate and modify for 20h. After solid-liquid separation, the zeolite is dried at 105° C., and then calcined at 300° C. for 150 minutes to obtain a multifunctional modified zeolite. The zeolite modified by this method has a removal rate of 60.53% for ammonia nitrogen.

Embodiment 2

[0036] The natural zeolite is crushed and sieved to obtain zeolite particles with a mesh size of 20-50 mesh. Ultrasonic cleaning was performed for 10 minutes at a power of 360W and a solid-to-liquid ratio of zeolite to water of 1g:20mL. Mix the pretreated zeolite with 0.10mol / L sodium metaaluminate solution at a solid-to-liquid ratio of 1g:20mL, and impregnate and modify for 20h. After solid-liquid separation, the zeolite is dried at 105° C., and then calcined at 200° C. for 120 minutes to obtain a multifunctional modified zeolite. The zeolite modified by this method has a removal rate of 59.67% for ammonia nitrogen.

Embodiment 3

[0038] The natural zeolite is crushed and sieved to obtain zeolite particles with a mesh size of 20-50 mesh. Ultrasonic cleaning was performed for 30 minutes at a power of 480W and a solid-to-liquid ratio of zeolite to water of 1g:20mL. Mix the pretreated zeolite with 0.50mol / L sodium metaaluminate solution at a solid-to-liquid ratio of 1g:20mL, and impregnate and modify for 24h. After solid-liquid separation, the zeolite is dried at 105° C., and then calcined at 300° C. for 120 minutes to obtain a multifunctional modified zeolite. The zeolite modified by this method has a removal rate of 66.75% for ammonia nitrogen.

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Abstract

The invention discloses a natural zeolite multifunctional modification method for improving the ammonia nitrogen removal rate of a water body. The method comprises the following steps: (1) crushing and screening natural zeolite, and carrying out ultrasonic cleaning pretreatment; (2) immersing the pretreated zeolite into a sodium metaaluminate solution, carrying out solid-liquid separation a certain time later, and drying the zeolite for later use; and (3) calcining the zeolite impregnated with the sodium metaaluminate solution to obtain the multifunctional modified zeolite. Sodium ions are used for increasing the ion exchange capacity, part of silicon element of zeolite is removed by utilizing solution alkalinity, the aluminum element is increased, and the silicon-aluminum ratio is reduced; and the exogenous aluminum element is embedded into a zeolite framework through calcination, meanwhile, and pore channels are dredged, so the mesoporous proportion is increased, the pore structure is improved, multifunctional modification of the natural zeolite is achieved, secondary pollution caused by the washing link after solution impregnation is avoided, and the removal rate of the modifiednatural zeolite on ammonia nitrogen in water body is remarkably increased.

Description

technical field [0001] The invention relates to the field of wastewater treatment, in particular to a multifunctional modification method of natural zeolite for improving the removal rate of ammonia nitrogen in water bodies. Background technique [0002] Ammonia nitrogen is widely used in industry, agricultural production and people's daily life. It is one of the main pollutants that cause eutrophication and environmental pollution in the wastewater discharged from petroleum, chemical, meat processing, aquaculture and other industries. Ammonia nitrogen in water can be converted into nitrite under certain conditions. If consumed for a long time, nitrite in water can combine with protein to form nitrosamines. Nitrosamines are strong carcinogens and are extremely harmful to human health. [0003] At present, the treatment methods of ammonia nitrogen wastewater mainly include: air stripping method, breakpoint chlorination method, chemical precipitation method, membrane separati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/16B01J20/28B01J39/14B01J20/30C02F1/28C02F1/42C02F101/16
CPCB01J20/165B01J20/04B01J39/14B01J20/28097C02F1/288C02F1/42C02F2001/425C02F2101/16
Inventor 付海陆于子瑶李祎沈路明董文杰曹爽李金页徐立恒
Owner CHINA JILIANG UNIV
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