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Reaction method and device for strengthening Cr (VI) reduction based on square wave power supply

A reaction device and power supply technology, applied in chemical instruments and methods, water pollutants, water/sewage treatment, etc., can solve the problems of reducing Cr reduction efficiency, low mass transfer efficiency, etc., achieve stable reduction, reduce passivation reaction, The effect of low energy consumption

Pending Publication Date: 2021-06-04
JINAN UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to overcome the technical problems of reducing the reduction efficiency of Cr(VI) caused by the passivation of the porous electrode and the low mass transfer efficiency existing in the above prior art, and to provide a method for strengthening Cr(VI) reduction based on square wave power supply Reaction method and device thereof

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  • Reaction method and device for strengthening Cr (VI) reduction based on square wave power supply
  • Reaction method and device for strengthening Cr (VI) reduction based on square wave power supply
  • Reaction method and device for strengthening Cr (VI) reduction based on square wave power supply

Examples

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Effect test

Embodiment 1

[0039] Such as figure 1 Shown, a kind of reaction device based on square-wave power supply strengthening Cr(VI) reduction comprises reactor, insulating layer 3, porous electrode 7 and square-wave power supply 6, and the two ends of reactor are all provided with conical port, The two ports are respectively a water inlet 1 and a water outlet 5. The insulating layer 3 divides the reaction chamber into a first reaction chamber 2 and a second reaction chamber 4. A porous electrode 7 is installed in the first reaction chamber 2, and the other The porous electrodes 7 are installed in the second reaction chamber 4, and the two porous electrodes 7 are connected to the square wave power supply 6 through Ti wires or Pt wires. Materials for making porous electrodes include carbon-based or metal-based porous conductive materials, such as graphene sponge, carbon nanotube sponge, carbon fiber felt, glassy carbon, Ti foam, Ag foam, Au foam and other materials.

[0040] A kind of reaction met...

Embodiment 2

[0049] Except for the following technical features in this embodiment, other technical features are the same as those in Embodiment 1:

[0050] Both the porous electrode 7 of the first reaction chamber 2 and the porous electrode 7 of the second reaction chamber 4 in this embodiment are made of a 5 mm thick graphene sponge instead of a 10 mm thick carbon fiber felt.

[0051] In this embodiment, the diameters of the porous electrode 7 of the first reaction chamber 2 and the porous electrode 7 of the second reaction chamber 4 are both 5 cm instead of 10 cm.

[0052] The flux of the reaction device in the present embodiment adopts 1500L / h / m 2 Instead of 500L / h / m 2 .

[0053] The Cr(VI) solution in this embodiment uses 20 mg / L Cr(VI) solution (pH 6) instead of 20 mg / L Cr(VI) solution (pH 2).

[0054] The square wave power supply 6 in this embodiment uses AC current instead of AC voltage, and uses high-level current 10mA and low-level current -10mA instead of high-level voltage 1...

Embodiment 3

[0058] Except for the following technical features in this embodiment, other technical features are the same as those in Embodiment 1:

[0059] In this embodiment, the porous electrode 7 of the first reaction chamber 2 and the porous electrode 7 of the second reaction chamber 4 are both made of Ti foam with a thickness of 2.5 mm instead of carbon fiber felt with a thickness of 10 mm.

[0060] In this embodiment, the diameters of the porous electrode 7 of the first reaction chamber 2 and the porous electrode 7 of the second reaction chamber 4 are both 5 cm instead of 10 cm.

[0061] The throughput of the reaction device in this embodiment adopts 1000L / h / m 2 Instead of 500L / h / m 2 .

[0062] The Cr(VI) solution in this example is 5 mg / L Cr(VI) solution (pH 8) instead of 20 mg / L Cr(VI) solution (pH 2).

[0063] Such as Figure 5 Shown, a kind of reaction device (this embodiment) that strengthens Cr (VI) reduction based on square wave power supply: the power supply mode of squa...

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Abstract

The invention discloses a reaction device for strengthening Cr (VI) reduction based on a square wave power supply, which comprises a reactor, an insulating layer, porous electrodes and a square wave power supply, both ends of the reactor are provided with ports, the insulating layer divides a reaction chamber into a first reaction chamber and a second reaction chamber, one porous electrode is installed in the first reaction chamber, the other porous electrode is mounted in the second reaction chamber, and the two porous electrodes are both connected with the square wave power supply. The method reduces the passivation reaction of the porous electrodes, improves the mass transfer effect, has the remarkable advantages of sustainable operation and low energy consumption, is suitable for online treatment of large and medium-scale Cr (VI) sewage, and is particularly suitable for Cr (VI) sewage treatment of metallurgical and chemical enterprises.

Description

technical field [0001] The invention relates to the field of hexavalent chromium sewage treatment, in particular to a reaction method and a device for strengthening the reduction of Cr(VI) based on a square wave power supply. Background technique [0002] With the rapid development of modern industry, the large-scale development and application of heavy metals have caused serious soil and groundwater pollution. Among them, chromium is one of the most polluting heavy metals. It mainly exists in the form of Cr(III) and Cr(VI) in the environment, and the toxicity of Cr(VI) is 500 times that of Cr(III). Cr(VI) can exist stably in the environment, has strong solubility and mobility in water, is easily absorbed and enriched by living organisms, and is very carcinogenic and mutagenic to living organisms. Cr(VI) compounds are listed as priority pollutants and A-class human carcinogens by the US Environmental Protection Agency. my country's "Drinking Water Hygienic Standards" (GB 57...

Claims

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Application Information

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IPC IPC(8): C02F1/461C02F101/22
CPCC02F1/4678C02F1/46109C02F1/006C02F2001/46161C02F2101/22C02F2201/46175
Inventor 刘海王旸皮霜玉王文宜张佳春秀吴天舒范存霖
Owner JINAN UNIVERSITY
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