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Underground water nitrogen-fixation remediation filtering material and preparation method thereof

A groundwater and filter material technology, applied in chemical instruments and methods, water/sewage treatment, water/sludge/sewage treatment, etc., can solve the problems of limited use range, single composition and mechanism of action, etc., and achieve a small water resistance coefficient. Effect

Active Publication Date: 2011-06-29
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The problem in practice is that the composition and mechanism of action are single, and the scope of use is limited

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Proportioning 70% by weight of clinoptilolite, 25% by weight of clinoptilolite, 5% by weight of diatomite powder, clinoptilolite and perolite are pulverized to 200 mesh, fully mixed evenly, and granulated While adding water in the machine, roll it to make a spherical filter material with a particle size of 3mm, and calcinate it at 800°C for 4 hours to make an ammonia nitrogen adsorption filter material. Its material characteristics are BET=25m2 / g, porosity 80%, particle strength 55N / particle. Using this filter material for groundwater with an initial ammonia nitrogen concentration of 1.0 mg / l, after 1 hour of equilibrium adsorption, the feed ratio is 1:20 (filter material: water), and the ammonia nitrogen removal rate reaches 12.5%.

Embodiment 2

[0026] 80% by weight of mordenite, 19% by weight of kaolin, 1% by weight of activated carbon powder, crushed mordenite and kaolin to 200 mesh, fully mixed, rolled in a granulator while adding water A spherical filter material with a particle size of 3mm is calcined at 500°C for 2 hours under the protection of a reducing atmosphere to make an ammonia nitrogen adsorption filter material. Its material characteristics are BET 42m2 / g, porosity 93%, particle strength 41N / particle. Using this filter material for groundwater with an initial concentration of ammonia nitrogen of 1.0 mg / l, after 1 hour of equilibrium adsorption, the feed ratio is 1:20 (filter material: water), and the removal rate of ammonia nitrogen reaches 31%.

Embodiment 3

[0028] Proportioning 80% by weight of hydrotalcite, 10% by weight of montmorillonite, and 10% by weight of diatomite, fully mixed evenly, adding water while rolling in the granulator to make a spherical filter with a particle size of 3mm The material is calcined at 800°C for 1 hour to make a nitrate nitrogen adsorption filter material. Its material characteristics are BET 76m2 / g, porosity 42%, particle strength 61N / grain. Using this filter material for groundwater with an initial concentration of nitrate nitrogen of 1.0 mg / l, after 1 hour of equilibrium adsorption, the feed ratio is 1:20 (filter material: water), and the removal rate of nitrate nitrogen reaches 53%.

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Abstract

The invention discloses an underground water nitrogen-fixation remediation filtering material and a preparation method thereof, belonging to the field of underground water remediation. The filtering material is prepared from the following components in percentage by weight: 10-50% of plastic binding mineral, 1-10% of permeable substrate and 40-80% of inorganic cation exchange substrate or inorganic anion exchange substrate. The preparation method comprises the following steps: preparing raw materials according to the percentage by weight, and pulverizing the plastic binding mineral and the inorganic cation exchange substrate or inorganic anion exchange substrate to 200 meshes for later use; pulverizing the permeable substrate to 50 meshes for later use; thoroughly mixing the pulverized raw materials, granulating, and rolling to obtain balls; and calcining the obtained ball-shaped filtering material. The remediation filtering material can be combined with other biological curing materials, and has the technical advantages of low water resistance coefficient, almost no short stream or circle stream, and the like.

Description

technical field [0001] The invention relates to a filter material for groundwater in-situ restoration and a preparation method thereof, more specifically to a groundwater nitrogen immobilization restoration filter material and a preparation method thereof. Background technique [0002] The main forms of inorganic nitrogen in groundwater are ammonia nitrogen, nitrite nitrogen and nitrate nitrogen. The former is a cation, and the latter two are anions, and the amount is dominated by ammonia nitrogen. Groundwater inorganic nitrogen pollution removal technology is divided into biological treatment technology and physical and chemical treatment technology. The so-called in-situ remediation is to use biological treatment or physical and chemical treatment technology to achieve the purpose of removing groundwater pollutants in the original position without pumping out the groundwater. [0003] Since the 1970s, a variety of in-situ remediation technologies such as permeable reacti...

Claims

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Application Information

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IPC IPC(8): C02F1/42C02F1/00
Inventor 阮晓红尹琳孙翰朱晓明毛韵喆
Owner NANJING UNIV
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