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A method for membrane filtration coupling photoreduction removal and recovery of chromium

A technology of membrane filtration and light coupling, applied in chemical instruments and methods, reduced water/sewage treatment, improvement of process efficiency, etc., to achieve the effects of no secondary pollution, promotion of reduction rate, and broad application prospects

Active Publication Date: 2019-09-24
BEIJING GENERAL RES INST OF MINING & METALLURGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The method also addresses the question of how to regenerate and reuse polymers

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A solution with a Cr(VI) concentration of 0.5 mg / L has a pH value of 6. The average molecular weight is added to be 10000 polyoxyethylene-polyoxypropylene copolymer (wherein the polyethylene oxide block accounts for 40% of the mass fraction of the copolymer), and the concentration of the copolymer in the solution is 10g / L, using polytetrafluoroethylene The flat membrane is used for filtration, and the removal rate of Cr(VI) reaches 95.8%. Put the retained high polymer solution containing Cr(VI) under 500W tungsten halogen light for 50 minutes, and 99.1% of hexavalent chromium is reduced to trivalent chromium. The membrane stripping of Cr(III)-containing high polymer is carried out by dilute sulfuric acid aqueous solution with pH=2.0, and the stripping rate of Cr(III) reaches 94.5%.

Embodiment 2

[0026] A certain Cr(VI) concentration is 1g / L solution, and the pH value of the solution is adjusted to 3 with sulfuric acid. Polyethylene glycol with an average molecular weight of 20,000 was added, and the concentration of polyethylene glycol in the solution was 75g / L. It was filtered with a polytetrafluoroethylene flat membrane, and the removal rate of Cr(VI) reached 94.2%. Put the retained high polymer solution containing Cr(VI) under 500W tungsten halogen light for 70min, and 99.5% of hexavalent chromium is reduced to trivalent chromium. The membrane stripping of Cr(III)-containing high polymer was carried out by dilute sulfuric acid aqueous solution with pH=1.0, and the stripping rate of Cr(III) reached 92.1%.

Embodiment 3

[0028] A certain Cr(VI) concentration is 0.2g / L solution, and the pH value of the solution is adjusted to 2 with hydrochloric acid. Polyethylene glycol with an average molecular weight of 100,000 was added, and the concentration of polyethylene glycol in the solution was 5g / L. Polysulfone ultrafiltration membrane was used for filtration, and the removal rate of Cr(VI) reached 95.2%. The trapped Cr(VI)-containing polymer solution was placed under a 300W xenon lamp for 50 minutes, and 99.1% of the hexavalent chromium was reduced to trivalent chromium. The high polymer containing Cr(III) is stripped by membrane with dilute hydrochloric acid aqueous solution with pH=2.0, and the stripping rate of Cr(III) reaches 94.5%.

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Abstract

The invention discloses a method for membrane filtration coupling light reductive removal and chromium recycling, and belongs to the field of wastewater heavy metal ion treatment. A high polymer is added into a water solution containing hexavalent chromium, the high polymer and the hexavalent chromium form a macromolecular complex which is intercepted through membrane filtration to be removed from water, under illumination, the intercepted Cr(VI) is reduced into Cr(III), and recycling is achieved through membrane reverse extraction. Removal of hexavalent chromium in chromate waste water can be achieved, the hexavalent chromium can be reduced into trivalent chromium to be recycled, the green technological method is simple, efficient and low in energy consumption, and the wide application prospect is achieved for environment sewage treatment and comprehensive resource utilization.

Description

technical field [0001] The invention belongs to the field of wastewater heavy metal ion treatment, in particular, the invention relates to a method for removing and recovering chromium through membrane filtration coupled with photoreduction. Background technique [0002] Chromium is a common heavy metal pollutant, mainly in the form of Cr(VI) and Cr(III). Among them, Cr(VI) is mostly found in industrial wastewater such as electroplating factories, tanneries, smelters and printing and dyeing factories. Cr(VI) is highly toxic and belongs to carcinogenic, teratogenic and abrupt-causing substances. If it is discharged directly, it will cause serious harm to humans, animals and plants. All countries have formulated strict chromium-containing wastewater discharge standards. In my country's wastewater discharge standard (GB8978-1996), the maximum allowable discharge concentration of Cr(VI) is 0.5mg / L. Since the toxicity of Cr(III) is much lower than that of Cr(VI), and Cr(III) is...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/08C22B7/00C22B34/32C02F101/22
CPCC02F1/26C02F1/30C02F1/44C02F1/442C02F1/444C02F1/70C02F9/00C02F2101/22C02F2103/007C02F2103/06C02F2103/10C02F2103/16C02F2103/24C02F2209/06C22B7/006C22B34/32Y02P10/20
Inventor 谢铿王海北刘三平
Owner BEIJING GENERAL RES INST OF MINING & METALLURGY
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