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Method for simultaneously treating hexavalent chrome wastewater and organic dye wastewater

An organic dye and simultaneous treatment technology, applied in chemical instruments and methods, water pollutants, neutralized water/sewage treatment, etc., can solve the problems of difficult composition control, complex electroplating wastewater quality, etc., achieve fast reaction rate, reduce heavy metals Effects of ionic toxicity, mild reaction conditions

Inactive Publication Date: 2015-06-17
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The water quality of electroplating wastewater is complex and its composition is difficult to control. In addition to cyanide and acid-base, it also contains a large amount of heavy metal ions, such as chromium, cadmium, nickel, copper, zinc, gold, silver, etc.

Method used

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  • Method for simultaneously treating hexavalent chrome wastewater and organic dye wastewater
  • Method for simultaneously treating hexavalent chrome wastewater and organic dye wastewater
  • Method for simultaneously treating hexavalent chrome wastewater and organic dye wastewater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Prepare 100 mL of reaction solution, so that the concentration of Orange II in it is 28.6 μM (10 mg L ?1 ), Cr 6+ The concentration is 0.1mM, with H 2 SO 4 Quickly adjust the pH of the solution to slightly lower than 3.0, take 3mL of the solution to measure the initial concentration of orange II (put it back into the original solution to reduce the volume change), take 2mL of the solution to measure Cr 6+ initial concentration (without replacement), then add 1.1 mL of stock solution with a concentration of 50 mM Na 2 SO 3 , so that the concentration is 0.55mM, add a magnet, turn on the magnet stirrer, and the pH of the solution is 3.0 at this time. Then take samples at 1, 3, 5, 7, 10, 15, 20, and 30 minutes to measure orange II, Cr 6+ concentration, the final orange Ⅱ decolorization efficiency was 57.7%, Cr 6+ The reaction was rapid within 1 min and the final reduction efficiency was 97.8%.

[0033] Change the pH of the solution to 4.0, 5.0, 6.0, 7.0, and use the...

Embodiment 2

[0035] Prepare 100 mL of reaction solution, so that the concentration of Orange II in it is 28.6 μM (10 mg L ?1 ), Na 2 SO 3 The concentration is 0.55mM, with H 2 SO 4 Quickly adjust the pH of the solution to 3.0, take 3 mL of the solution to measure the initial concentration of orange II (put it back into the original solution to reduce the volume change), and then add 50 μL of Cr with a concentration of 0.2M 6+ stock solution, making Cr 6+ The concentration is 0.1mM, add magneton, turn on the magnetic stirrer, take samples at 1, 3, 5, 7, 10, 15, 20, and 30 minutes, measure the concentration of Orange II, and finally obtain the decolorization efficiency of Orange II as 57.7%.

[0036] Change Cr 6+ with Na 2 SO 3 Concentration ratios of the concentration ratios are 0.15:0.55, 0.1:1.0, 0.05:0.55, 0.1:0.1, and other conditions remain unchanged. The measured orange-yellow II decolorization efficiencies are 71.5%, 50.6%, 33.3%, and 26.5%, respectively.

[0037] In addition...

Embodiment 3

[0039] Prepare 100 mL of reaction solution so that the concentration of Orange II is 286 μM (100 mg L ?1 ), Na 2 SO 3 The concentration is 0.55mM, with H 2 SO 4 Quickly adjust the pH of the solution to 3.0, take 3 mL of the solution to measure the initial concentration of orange II (put it back into the original solution to reduce the volume change), and then add 75 μL of 0.2M Cr 6+ stock solution, making Cr 6+ The concentration is 0.15mM, add magnets, turn on the magnetic stirrer, take samples at 1, 3, 5, 7, 10, 15, 20, and 30 minutes, measure the concentration of Orange II, and finally obtain the decolorization efficiency of Orange II is 17.2%.

[0040] Change Cr 6+ - with Na 2 SO 3 The concentration ratio of the concentration ratio is 1.5:5.5, 0.75:2.75, 1.5:2.75, 2.25:4.125, and other conditions remain unchanged. The measured orange yellow II decolorization efficiency is 22.4%, 34.1%, 52.7%, 66.8%.

[0041] Set Cr 6+ Concentration is 2.25mM, without Na 2 SO 3 In...

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Abstract

The invention discloses a method for simultaneously treating hexavalent chrome wastewater and organic dye wastewater. The preparation method comprises the following steps: adding sulfite and hexavalent chrome wastewater into organic dye wastewater, regulating the pH value to 3-7, and stirring or aerating until the organic dyes are decolorized or the hexavalent chrome is completely reduced. In the reaction, the complex formed by the hexavalent chrome and sulfurous acid generates intramolecular electron transfer, so that the hexavalent chrome is reduced into trivalent chrome, and the sulfuric acid free radical and hydroxy free radical are simultaneously generated to initiate the oxidizing decolorization on the coexisting dyes. The concentration of the sulfite is 1.9-35.0 times of that of the dyes, the concentration of the hexavalent chrome is 0.5-7.9 times of that of the dyes, and the pH value is 3-7. The hexavalent chrome is reduced into the lower-toxicity trivalent chrome during dye decolorization without adding any other catalyst or oxidizer; and thus, the method is simple to operate and is quick and efficient. Therefore, the method has very wide application prospects.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and in particular relates to a simultaneous treatment method for decolorizing organic dyes and reducing heavy metal hexavalent chromium ions based on sulfur-oxygen free radicals. Background technique [0002] Water pollution has always been a common problem and contradiction faced by economic development and environmental protection. With the development of industry and the improvement of scientific and technological level, there are more and more types of pollutants in water bodies, and their concentrations are getting higher and higher, which will seriously threaten the environment. quality and human health. Therefore, the removal of water pollutants has great theoretical and practical significance, especially the removal of multiple pollutants at the same time, which puts forward higher requirements for sewage treatment technology. The invention proposes a feasible simultaneo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/70C02F1/72C02F1/66C02F101/22C02F103/30
Inventor 吴峰袁亚男杨少杰李进军
Owner WUHAN UNIV
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