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Modified zeolite filling material BMZ-1 and its preparation method and application

A technology for modifying zeolite and zeolite powder, applied in chemical instruments and methods, other chemical processes, silicates, etc., can solve the problems of high framework density, low porosity and small specific surface area of ​​natural zeolite

Inactive Publication Date: 2012-08-08
PEKING UNIV +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, natural defects such as high skeleton density, low porosity, and small specific surface area of ​​natural zeolite limit the effective entry of microorganisms into the zeolite crystal cavity for attachment and growth, and poor adaptability to hydraulic loads during high-concentration and large-volume water treatment operations. The biological nitrification regeneration of zeolite is affected to a certain extent

Method used

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  • Modified zeolite filling material BMZ-1 and its preparation method and application
  • Modified zeolite filling material BMZ-1 and its preparation method and application
  • Modified zeolite filling material BMZ-1 and its preparation method and application

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Effect test

Embodiment 1

[0035] According to the following proportions and methods, the modified zeolite filler BMZ-1 provided by the invention is prepared:

[0036] Natural zeolite particles with a particle size of 0.5-2mm, that is, zeolite sand, are composed of 60 parts by weight of zeolite powder with a fineness of 200-400 mesh, 10 parts by weight of starch with a fineness of 50-150 mesh, and coal with a fineness of 60-120 mesh. The zeolite powder mixture composed of 5 parts by weight of powder and 25 parts by weight of white Portland cement is placed in the mixer and mixed with a volume ratio of 1:1. Concentration is 10%, the aqueous solution of carboxymethyl cellulose that weight-average molecular weight is 19900) mixes with the ratio of accounting for 15% of zeolite sand and zeolite powder mixture total volume, stirs to obtain mixed matrix, this mixed matrix is ​​put into particle Extruded by a granulator, dried at 105°C for 1 hour, and then put into a baking furnace for sintering at 650°C for 2...

Embodiment 2

[0079] Example 2, Application of Modified Zeolite Filler BMZ-1 in High Nitrogen Wastewater Treatment

[0080] 1. Adsorption-degradation test in MSM liquid medium

[0081] Pyridine and quinoline are two typical toxic and harmful nitrogen-heterocyclic aromatic compounds, and it is difficult for ordinary microorganisms to degrade these two pollutants. The present invention designs a group of adsorption-degradation experiments in which zeolite is added to a simple degradation system to investigate the control of the modified zeolite to the concentration of ammonia nitrogen.

[0082] In the MSM liquid medium of adding high-efficiency pyridine-degrading strain Paracoccus sp.BW001, preservation number (EU192073) and quinoline-degrading strain Pseudomonas sp.BW003, preservation number (EU371554), the natural zeolite and modified zeolite BMZ-1 were paired. Adsorption-degradation test of ammonia nitrogen, pyridine and quinoline. It was found that the presence of zeolite did not interf...

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Abstract

The invention discloses a modified zeolite filling material BMZ-1 and its preparation method and application. The zeolite filling material is prepared by the following method: uniformly mixing natural zeolite sand, a zeolite powder mixing agent and a bonding agent; carrying out extrusion moulding, followed by drying and sintering to obtain the modified zeolite filling material, wherein the zeolite powder mixing agent is composed of a zeolite powder, starch, coal dust and portland cement. The filling material has selective ion exchange type adsorption capability of NH4<+> in a solution. The adsorption kinetics accords with quasi-second-order equation and the adsorption isotherm accords with Freundlich model. The filling material can be used in a high-concentration ammonia-nitrogen wastewater treatment system, being more conducive to adhesion growth of microorganisms to form biological zeolite. By the synergism of continuous ''exchange adsorption-biodegradation'', impact resistance of the treatment system is significantly raised, and the problem that it is hard to regenerate traditional zeolite for treating ammonia-nitrogen can be solved.

Description

technical field [0001] The invention relates to a modified zeolite filler BMZ-1 and its preparation method and application. Background technique [0002] Zeolite (Zeolite) was discovered by the Swedish mineralogist Kronsty in 1756. It is a cluster of hydrous silicate minerals with a framework structure and is the general term for zeolite minerals. Zeolite is mainly formed by devitrification of volcanic lava or pyroclastic rock. It is often found in the pores of extrusive rocks, especially basalts, and also in sedimentary rocks, metamorphic rocks, hydrothermal deposits and some modern hot spring deposits. More than 40 types of natural zeolite ore have been found so far. [0003] Zeolite is a porous crystal of hydrous aluminosilicate with a skeleton structure, and its chemical composition formula can be expressed as: (Na, K, Li) x (Mg, Ca, Ba, Sr) y [Al x+2y Si n-(x+2y) o 2n ]·mH 2 O. The chemical composition of zeolite is AlO, SiO, H 2 O and metal cations are compose...

Claims

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Application Information

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IPC IPC(8): B01J20/16B01J20/30C02F1/28C02F3/10
CPCY02W10/10
Inventor 温东辉孙庆华柏耀辉吕安平
Owner PEKING UNIV
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