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Device and method for removing hexavalent chromium from electroplating wastewater for electrocoagulation-electric flotation

A technology of electroplating wastewater and electric floatation, applied in metallurgical wastewater treatment, chemical instruments and methods, water pollutants, etc., can solve the problems of low removal efficiency, high treatment cost, inconvenient equipment and methods, etc., and reduce electricity consumption , improve the collection efficiency, improve the effect of removal efficiency

Active Publication Date: 2021-10-08
ZHEJIANG ZHIYUAN ENVIRONMENTAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This invention adopts electroflocculation equipment and method to deal with the heavy metal ions in the electroplating wastewater, but the cathode will produce H in the electroflocculation reactor 2 , which prevents the floc from fully settling on the way out of the electrolyzer
At the same time, in order to meet the removal standard, because the particle size of the floc is very small, the filtration step, ultrafiltration step and reverse osmosis step must be carried out after electrocoagulation, which increases the tediousness and production cost of electroflocculation treatment of electroplating wastewater
Chinese patent 201510995773.2 discloses a treatment system and method for electroplating chromium-containing wastewater, and specifically discloses that the system includes a regulating tank, an acidification tank, an electroflocculation reduction device, a neutralization tank, a flocculation tank, a buffer tank, and a separation tank. The electro-flocculation reduction device is also used to reduce the hexavalent chromium ions in the electroplating wastewater under acidic conditions, and the neutralization step is separated from the flocculation step and the electro-flocculation step, but the membrane separation method is still used for the treatment of flocs , and the hexavalent chromium ions not completely reduced in the electro-flocculation step cannot be completely removed, which has caused the disadvantages of inconvenient equipment and methods protected by this invention, high processing costs and low removal efficiency

Method used

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  • Device and method for removing hexavalent chromium from electroplating wastewater for electrocoagulation-electric flotation
  • Device and method for removing hexavalent chromium from electroplating wastewater for electrocoagulation-electric flotation
  • Device and method for removing hexavalent chromium from electroplating wastewater for electrocoagulation-electric flotation

Examples

Experimental program
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Effect test

Embodiment 1

[0033] Such as figure 1 The shown electrocoagulation-electroplating wastewater hexavalent chromium removal device for electroplating wastewater includes an electroflocculation unit 1, a neutralization reaction unit 2, a first electric floating unit 5 and a second electric floating unit 6 arranged and connected in sequence; The flocculation unit 1 is provided with an acid solution pool 8 for maintaining the acidic pH of the electrocoagulation reaction and a first micro-processing pump 9 for pumping the acid solution, and the electrocoagulation unit 1 is provided with a mixed iron-aluminum electrode system 1-1, which It consists of 4 anodes 111, 113, 115, 117 and 3 cathodes 112, 114, 116. Any two anodes in the 4 anodes are iron electrodes, and the other two anodes are aluminum electrodes. For example, 111 and 115 are iron electrodes. Electrodes, while 113 and 117 are aluminum electrodes; also can be 111 and 113 are iron electrodes, while 115 and 117 are aluminum electrodes; also...

Embodiment 2

[0052] Such as figure 2 The electroflocculation-electroplating wastewater hexavalent chromium removal device for electroflocculation shown in the example 2 differs from the electroplating wastewater hexavalent chromium removal device for electroflocculation-electric flotation in that:

[0053] 1) The three cathodes 112, 114 and 116 of the mixed iron-aluminum electrode system 1-1 are aluminum electrodes, and are connected to a pulse power supply in a unipolar mode;

[0054] 2) Any two of the four anodes 111, 113, 115, and 117 of the mixed iron-aluminum electrode system 1-1 are iron electrodes, and the other two anodes are aluminum electrodes. Inconsistent;

[0055] 3) A vacuum ultraviolet photocatalytic reaction unit 7 with a peristaltic pump 70 is arranged between the neutralization reaction unit 2 and the first electric floating unit 5, and the vacuum ultraviolet photocatalytic reaction unit is sequentially provided with an ultraviolet lamp 71, a quartz Sleeve 72 and photo...

Embodiment 3

[0067] 1) The electroplating waste water is passed into the electroflocculation unit 1, and the sulfuric acid with a volume fraction of 15% in the acid solution pool 8 is pumped into the electroflocculation unit 1 through the first micro-treatment pump 9 to control the pH value in the electroflocculation unit 1 In 5, a cresol acid surfactant with a volume fraction of 0.11% is also added in the acid pool 8, and the power supply device 1-3 is connected, and under the action of an external voltage, the anode of the mixed iron-aluminum electrode system 1-1 111, 113, 115, 117 release cations, and cathodes 112, 114, 116 release OH - , carry out flocculation and sedimentation to the wastewater, and react for 40 minutes;

[0068] 2) The waste water after flocculation and reduction in the electrocoagulation unit 1 is sent into the neutralization reaction unit 2, and is pumped into the lye pool 10 by the second micro-processing pump 11, and is composed of 0.2M NaOH and 0.1M NaOH 2 CO ...

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Abstract

The invention provides a device and method for removing hexavalent chromium from electroplating wastewater for electrocoagulation-electric flotation, wherein the device includes an electrocoagulation unit and a neutralization reaction unit arranged in sequence and communicated with each other, and a pump for pump is arranged beside the neutralization reaction unit An air compressor for feeding compressed air, a communication pipe for preventing liquid backflow is provided between the electrocoagulation unit and the neutralization reaction unit; a flow guide pipe for guiding compressed air is arranged in the neutralization reaction unit After the neutralization reaction unit, a first electric floating unit and a second electric floating unit are sequentially arranged, and the first electric floating unit is provided with a first interlocking electrode and a first three-phase separator; The second electric floating unit is provided with a second interlocking electrode and a second three-phase separator. The device and method provided by the invention have high electrical conductivity and low power consumption, can effectively reduce operating costs, do not need to add polymer flocculants, and can effectively improve the removal efficiency of hexavalent chromium and total chromium.

Description

technical field [0001] The invention relates to the technical field of electroplating wastewater treatment, in particular to a device and method for removing hexavalent chromium from electroplating wastewater for electroflocculation-electric flotation. Background technique [0002] Electroplating is an industrial process that uses chemical or electrochemical methods to decorate, protect or obtain certain new properties on metal or non-metal surfaces. It has strong industrial versatility and wide application. The functional requirements of different components are different, and the operation methods and processes are also inconsistent, resulting in a variety of heavy metal ions in the water quality components of electroplating wastewater, among which hexavalent chromium ions are seriously harmful to the human body. Traditional electroplating wastewater treatment methods include adsorption, chemical precipitation, biodegradation, ion exchange, and electrochemical methods. Th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/08C02F101/22C02F103/16
CPCC02F1/32C02F1/463C02F1/465C02F1/5236C02F1/5281C02F1/70C02F9/00C02F2101/22C02F2103/16C02F2301/08
Inventor 武永强周刚沈勘力谢传建
Owner ZHEJIANG ZHIYUAN ENVIRONMENTAL TECH CO LTD
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