Granular filtering material for adsorbing and removing heavy metals in water and preparation method thereof

A granular filter material and heavy metal technology, applied in the direction of adsorption of water/sewage treatment, chemical instruments and methods, water pollutants, etc., can solve secondary pollution and other problems, reduce the increase of structures, good economic and social benefits, and low cost Effect

Active Publication Date: 2015-01-21
BEIJING FORESTRY UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Directly using zeolite, fly ash, etc. to treat heavy metal-containing wastewater has achieved good treatment results, but the gray-water separation process requires coagulation, sedimentation, filtration and other structures, and direct addition will produce a large amount of sludge containing heavy metals. Improper sludge treatment is likely to cause secondary pollution problems

Method used

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  • Granular filtering material for adsorbing and removing heavy metals in water and preparation method thereof
  • Granular filtering material for adsorbing and removing heavy metals in water and preparation method thereof
  • Granular filtering material for adsorbing and removing heavy metals in water and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Preparation of 1mol / L acid modified granular filter material and its adsorption performance test.

[0031]The fly ash and zeolite powder were soaked in 1mol / L hydrochloric acid for 24 hours respectively, then washed with deionized water until neutral, and then freeze-dried at -50°C and a vacuum of 20 Pa for 40 hours. Crush chitin to a particle size of less than 5 mm, add sulfonated coal and mix well, and then pyrolyze at 150°C for 2 hours under nitrogen, and then at 400°C for 2 hours. Weigh fly ash, zeolite powder, magnesium aluminum hydrotalcite, biochar, magnesium lignosulfonate and bentonite according to the mass ratio of 55:35:5.5:3:0.5:1 and mix them evenly. Add 2 % deionized water, stirred evenly, aged at 4°C for 36 hours to make spherical particles, and air-dried for 40 minutes. Spherical particles were dried at 90°C for 3 hours, then roasted in a muffle furnace at 500°C for 3 hours, and cooled to room temperature with the furnace to obtain a particle filter mat...

Embodiment 2

[0034] Preparation of 2mol / L acid-modified granular filter material and its adsorption performance test.

[0035] The fly ash and zeolite powder were soaked in 2mol / L hydrochloric acid for 36 hours respectively, then washed with deionized water until neutral, and then freeze-dried at -50°C and a vacuum of 20 Pa for 48 hours. Crush the cellulose to a particle size of less than 5mm, add sulfonated coal and mix evenly, and pyrolyze at 150°C for 2h under the condition of nitrogen gas, and then pyrolyze at 350°C for 2h. Weigh fly ash, zeolite powder, magnesium-aluminum hydrotalcite, biochar, magnesium lignosulfonate and bentonite according to the mass ratio of 60:30:5:6:0.7:2.5 and mix them evenly. Add 3 % deionized water, stirred evenly, aged at 3°C ​​for 24 hours to make spherical particles, and air-dried naturally for 60 minutes. Spherical particles were dried at 110°C for 2 hours, then roasted in a muffle furnace at 600°C for 2 hours, and cooled to room temperature with the fu...

Embodiment 3

[0038] Preparation of 3mol / L acid-modified granular filter material and its adsorption performance test.

[0039] The fly ash and zeolite powder were soaked in 3mol / L hydrochloric acid for 30h, and then washed with deionized water until neutral, and then freeze-dried at -50°C and vacuum degree of 20Pa for 36h. Chitosan was crushed to a particle size below 5mm, sulfonated coal was added and mixed evenly, and pyrolyzed at 150°C for 2h under nitrogen, and then pyrolyzed at 500°C for 2h. Weigh fly ash, zeolite powder, magnesium aluminum hydrotalcite, biochar, magnesium lignosulfonate and bentonite according to the mass ratio of 65:40:7:3.5:0.5:1.5 and mix them evenly. Add 2 % deionized water, stirred evenly, aged at 2°C for 30 hours to make spherical particles, and air-dried for 30 minutes. Spherical particles were dried at 120°C for 1 hour, then roasted in a muffle furnace at 400°C for 4 hours, and cooled to room temperature with the furnace to obtain a particle filter material ...

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Abstract

The invention discloses a granular filtering material for adsorbing and removing heavy metals in water and a preparation method thereof. The granular material consists of the following components in part by mass: 80-120 parts of an adsorbent, 7-14 pats of an additive and 0.5-3 parts of a binding agent, wherein the adsorbent consists of the following components in part by mass: 50-70 parts of coal ash and 30-50 parts of zeolite powder or sea-foam stone powder; the additive consists of the following components in part by mass: 5-7 parts of Mg-Al hydrotalcite, 2-6 parts of biochar and 0.5-1 part of magnesium Lignosulfonate; the binding agent is bentonite. The granular filtering material is prepared through the steps of adsorbent acid modification, biochar preparation, granulation and heat treatment process. According to the invention, the prepared granular filtering material is 3-6 mm in granule size, is large in adsorption capacity and excellent in adsorption effect and can effectively remove heavy metals in water, and no secondary pollutants are dissolved out, so that the granular filtering material can be applied to the treatment on heavy metal micro-polluted water and industrial waste water containing heavy metals, and has good economic and social benefits.

Description

technical field [0001] The invention belongs to the technical field of heavy metal-polluted water treatment, in particular to a granular filter material for adsorbing and removing heavy metals in water and a preparation method thereof. Background technique [0002] Most of the heavy metals in natural water come from the discharge of industrial wastewater. The excessive concentration of heavy metals not only has a series of effects on the growth and development of aquatic animals and plants in the environment, physiological metabolism and other processes, but also endangers human health through the food chain; Its use in life and production. The survey results of the seven major water systems in my country show that the Yangtze River has certain pollution of cadmium (Cd) and mercury (Hg), second only to chemical oxygen demand (COD) and biochemical oxygen demand (BOD); The total Cd content of the Hailuan River exceeded the standard; in the monitoring of 26 state-controlled lak...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/22B01J20/30C10B53/02C02F1/28C02F101/20
CPCB01J20/08B01J20/103B01J20/12B01J20/18B01J20/20B01J20/223B01J2220/46C02F1/288C02F1/62C02F2101/103C02F2101/20C10B53/02Y02E50/10
Inventor 马伟芳聂超郭浩韩东梅严玉林
Owner BEIJING FORESTRY UNIVERSITY
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