Method for treating Cr(VI)-containing waste water

A wastewater and pretreatment technology, applied in water/sewage treatment, chemical instruments and methods, multi-stage water/sewage treatment, etc., can solve the problems of low water volume, high energy consumption, and restrictions on large-scale application, and achieve increased treatment Effects of scale, reduced energy consumption and processing costs, value for large industrial applications

Inactive Publication Date: 2019-01-15
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, experiments have found that the application of discharge technology in wastewater treatment often has problems such as less water directly treated and high energy consumption, which limits its large-scale application in industry
After searching, there is no report on the application of large-scale, economical and efficient treatment of Cr(VI)-containing wastewater by using dielectric barrier discharge technology

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  • Method for treating Cr(VI)-containing waste water

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Embodiment 1

[0028] A method for processing waste water containing Cr(VI), the specific steps are as follows:

[0029] (1) pre-determining the Cr(VI)-containing wastewater to be treated, and determining that its Cr(VI) content is 1mg / L; then a part of the Cr(VI)-containing wastewater is passed into a reaction vessel equipped with a dielectric barrier discharge device , wherein the dielectric barrier discharge device is provided with a plate-type high-voltage electrode and a ground electrode, and a barrier medium is installed below the high-voltage electrode; when the incoming Cr (VI) wastewater is submerged into the ground electrode and the distance between the water surface and the barrier medium above it is 6mm , turn on the plasma generating power supply, adjust the power supply input voltage to 30V, output frequency is 8KHz and make the discharge uniform and stable, the hydraulic retention time of the Cr(VI) wastewater in the reaction vessel is 10s; Reduction of Cr(VI) in the medium pr...

Embodiment 2

[0033] A method for processing waste water containing Cr(VI), the specific steps are as follows:

[0034] (1) Continuously feed simulated Cr(VI)-containing wastewater into the dielectric barrier discharge reaction vessel, wherein the Cr(VI) content is 50mg / L, and when the distance between the barrier medium and the liquid surface is 8mm, turn on the plasma generating power supply and adjust the power The input voltage of the power supply is 70V, the output frequency is 12KHz, and the hydraulic retention time is 60s; the Cr(VI) in the wastewater is reduced by generating low-temperature plasma, and at the same time, high-energy active particles such as hydroxyl radicals and hydrogen radicals are generated to obtain Cr(VI ) to remove pretreated wastewater rich in active particles.

[0035] (2) Rapidly pass the pretreated wastewater rich in active particles into the wastewater containing Cr(VI) to be treated, the mixing ratio is 1:1, and react for 25 minutes after mixing evenly to...

Embodiment 3

[0038] A method for processing waste water containing Cr(VI), the specific steps are as follows:

[0039] (1) Continuously feed the simulated Cr(VI)-containing wastewater into the dielectric barrier discharge reaction vessel, wherein the Cr(VI) content is 10mg / L, and the distance between the barrier medium and the liquid surface is 7mm; (VI) Reduction is carried out, and high-energy active particles such as hydroxyl radicals and hydrogen free radicals are produced at the same time to obtain pretreated wastewater rich in active particles after removal of Cr(VI). The input voltage is 50V, the output frequency is 10KHz, and the hydraulic retention time is 30s. ; Reduce Cr(VI) in wastewater by generating low-temperature plasma, and simultaneously generate high-energy active particles such as hydroxyl radicals and hydrogen free radicals, so as to obtain pretreated wastewater rich in active particles after removal of Cr(VI).

[0040] (2) Rapidly pass the pretreated wastewater rich in ...

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Abstract

The invention discloses a method for treating Cr(VI)-containing waste water. According to the method, a part of waste water is introduced into a reaction container provided with a medium blocking discharging device; plasmas are conducted to generate a power supply; the reduction is performed on Cr(VI) in the waste water through generating low-temperature plasmas; meanwhile, hydroxyl radical or hydrogen radical type high-energy active particles are generated to obtain the pretreated waste water containing rich active particles; then, the obtained pretreated waste water is fast introduced into the rest part of Cr(VI)-containing waste water to be treated to be proportionally mixed with waste water to be treated; after the reaction, the goal of eliminating Cr(VI) contaminants in the waste water is realized. The method has the advantages that in the whole process, the additional addition of chemical reagents is not needed; the Cr(VI) removal rate being 90 percent or higher can be realized;meanwhile, organic contaminants in the waste water can be eliminated; the energy consumption and cost of the discharging technology applied to Cr(VI) elimination in waste water can be greatly reduced;great industrial application values are realized.

Description

technical field [0001] The invention relates to a method for treating waste water, in particular to a method for treating waste water containing Cr(VI), and belongs to the technical field of sewage treatment. Background technique [0002] Chromium and chromium salts are important industrial raw materials, which are widely used in electroplating, tanning and other industrial production, but at the same time, a large amount of chromium-containing wastewater is produced, causing pollution to the water environment and ecological environment. [0003] Chromium in chromium-containing wastewater mainly exists in the form of Cr(III) and Cr(VI): Cr(III) is easily hydrolyzed in water or reacts with carbonate plasma to form insoluble precipitates, which are easily separated from the water environment ; At the same time, the biological toxicity of Cr(III) is relatively low, and taking a small amount also has the physiological functions of preventing and treating diabetes, arterioscleros...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/06C02F101/22
CPCC02F1/00C02F1/4678C02F2101/22
Inventor 宋超刘华瑜王曙光
Owner SHANDONG UNIV
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