A method of removing pollutants from water by utilizing a magnesium oxide adsorbent

A technology of magnesium oxide and pollutants, applied in water pollutants, adsorbed water/sewage treatment, chemical instruments and methods, etc., can solve problems such as poor sewage treatment effect, achieve high social and economic benefits, simple equipment, Easy to operate effect

Inactive Publication Date: 2017-03-15
营口东吉科技(集团)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention mainly aims at the technical problem of poor sewage treatment effect in the prior art, and provides a method for removing pollutants in water by using magnesium oxide adsorbent

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] A method for removing pollutants in water by using a magnesia adsorbent, comprising: (1) after magnesia is heated at 500 degrees for 2 hours, pour into the stirring water containing low concentration of heavy metal pollutants, magnesia reacts with water immediately Generate nano-scale flake magnesium hydroxide and adsorb heavy metal ions at the same time; (2) continue to stir until the adsorption equilibrium, and separate the magnesium hydroxide adsorbed with heavy metals from water by filtration, centrifugation or sedimentation drainage to form hydrogen containing heavy metals For magnesium oxide mud, if the treated water meets the discharge standard, it will be discharged directly, and if it fails to meet the discharge standard, it will undergo secondary treatment. (3) Recover the magnesium hydroxide mud that has adsorbed heavy metals in step (2), and recycle. Wherein, the heavy metal ions include CrO42-, Cr2O72-, AsO43- and AsO33-heavy metal anions, and the heavy met...

Embodiment 2

[0018] A method for utilizing magnesia adsorbent to remove pollutants in water, comprising: (1) after magnesia is heated at 600 degrees for 1.5 hours, it is poured into stirring water containing low-concentration heavy metal pollutants, and magnesia reacts with water immediately Generate nano-scale flake magnesium hydroxide and adsorb heavy metal ions at the same time; (2) continue to stir until the adsorption equilibrium, and separate the magnesium hydroxide adsorbed with heavy metals from water by filtration, centrifugation or sedimentation drainage to form hydrogen containing heavy metals For magnesium oxide mud, if the treated water meets the discharge standard, it will be discharged directly, and if it fails to meet the discharge standard, it will undergo secondary treatment. (3) Recover the magnesium hydroxide mud that has adsorbed heavy metals in step (2), and recycle. Wherein, the heavy metal ions include CrO42-, Cr2O72-, AsO43- and AsO33-heavy metal anions, and the he...

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Abstract

A method of removing pollutants from water by utilizing a magnesium oxide adsorbent is disclosed. The method includes (1) heating magnesium oxide at 100-700 DGE C for 1-3 h, then adding the heated magnesium oxide into water under stirring containing low-concentration heavy metal pollutants to allow the magnesium oxide and water to react to generate nanometer flake magnesium hydroxide, and absorbing heavy metal ions, and (2) continuously stirring until reaching adsorption balance, separating the magnesium hydroxide to which the heavy metals are adsorbed from the water through filtration, centrifugation or settlement drainage to form magnesium hydroxide slurry containing the heavy metals, discharging the treated water if the water reaches a discharge standard, and performing secondary treatment if the treated water fails to reach the discharging standard. The purification speed of the method for waste water is high, and a reaction product is stable, pollution-free and recoverable.

Description

technical field [0001] The invention relates to the field of sewage treatment, in particular to a method for removing pollutants in water by using a magnesium oxide adsorbent. Background technique [0002] With the development of my country's industry and the increase of wastewater discharge, heavy metal pollution has become an urgent problem to be solved. The treatment methods of heavy metal-containing wastewater adopted by countries all over the world mainly include: chemical method, ion exchange method, membrane separation method, microbial method, adsorption method, etc. Among them, the chemical method is relatively mature and has been widely used on a large scale. However, for water containing low concentrations of heavy metals, if chemical treatment is used, a large amount of chemical agents will be consumed and the amount of sludge will be increased; while ion exchange and membrane separation methods will require high equipment investment and maintenance costs; bio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/28C02F1/52C02F101/10C02F101/22
CPCC02F1/281C02F1/5254C02F2101/101C02F2101/22
Inventor 王福明曾凡东林宇
Owner 营口东吉科技(集团)有限公司
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