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Method for treating desulfurization wastewater by electrolysis

A technology for electrolytic treatment and desulfurization wastewater, applied in chemical instruments and methods, multi-stage water/sewage treatment, water/sludge/sewage treatment, etc., can solve the problem that COD is difficult to meet the standard, achieve good treatment effect, and simple operation , the effect of saving medicine

Inactive Publication Date: 2013-05-08
ZHEJIANG TIANLAN ENVIRONMENTAL PROTECTION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The invention provides a method for treating desulfurization wastewater by electrolysis, which solves the problem that the COD of high COD desulfurization wastewater is difficult to meet the standard

Method used

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  • Method for treating desulfurization wastewater by electrolysis
  • Method for treating desulfurization wastewater by electrolysis
  • Method for treating desulfurization wastewater by electrolysis

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] Take 800ml of calcium carbide slag-gypsum desulfurization wastewater and place it in an electrolytic cell with a volume of 1050ml. The ruthenium-based coated titanium electrode is used as the anode, and the size of the ruthenium-based coated titanium electrode is 120mm*50mm*1mm. Customized by Industry Co., Ltd., the stainless steel plate is used as the cathode, stirred with a stirrer, heated and energized for electrolysis, and electrolyzed while stirring. Then add polyacrylamide to the effluent of electrolytic treatment at 8 mg / L for flocculation, and measure the pollution indicators of the effluent.

[0051] Electrolysis reaction process parameters: electrode water ratio 1:16, current density 0.75mA / cm 2 , the distance between the plates is 15mm, and the electrolysis temperature is 30°C. The stirring intensity is 250r / min, the electrolytic reaction time is 60min, and the power consumption is 0.27kwh / t.

[0052] The experimental results are as follows:

[0053]

...

Embodiment 2

[0056] Take 800ml of white mud-gypsum desulfurization wastewater and place it in an electrolytic cell with a volume of 1050ml. The ruthenium-based coated titanium electrode is used as the anode. The size of the ruthenium-based coated titanium electrode is 120mm*50mm*1mm. Customized by Industry Co., Ltd., the stainless steel plate is used as the cathode, stirred with a stirrer, heated and energized for electrolysis, and electrolyzed while stirring. Then add polyacrylamide to 10 mg / L of electrolytic treatment effluent for flocculation, and measure the pollution indicators of effluent.

[0057] Electrolysis reaction process parameters: electrode water ratio 1:16, current density 1.0mA / cm 2 , the distance between the plates is 10mm, and the electrolysis temperature is 40°C. The stirring intensity is 250r / min, the electrolytic reaction time is 60min, and the power consumption is 0.36kwh / t.

[0058] The experimental results are as follows:

[0059]

[0060]

[0061] It can ...

Embodiment 3

[0063] Take 800ml of another white mud-gypsum method desulfurization wastewater and place it in an electrolytic cell with a volume of 1050ml. The ruthenium-based coated titanium electrode is used as the anode. The size of the ruthenium-based coated titanium electrode is 120mm*50mm*1mm. Customized by Xin Titanium Industry Co., Ltd., the stainless steel plate is used as the cathode. Stir with a stirrer and heat and energize for electrolysis. Electrolyze while stirring. Then add polyacrylamide to the effluent of electrolytic treatment at 9 mg / L for flocculation, and measure the pollution indicators of the effluent.

[0064] Electrolysis reaction process parameters: electrode water ratio 1:8, current density 2.0mA / cm 2 , the distance between the plates is 20mm, and the electrolysis temperature is 25°C. The stirring intensity is 400r / min, the electrolytic reaction time is 80min, and the power consumption is 0.72kwh / t.

[0065] The experimental results are as follows:

[0066] ...

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Abstract

The invention discloses a method for treating desulfurization wastewater by electrolysis. The method comprises the following steps of: (1) feeding the desulfurization wastewater into an open diaphragm-free electrolytic cell, electrifying direct current to a titanium-based coating electrode which is used as a positive electrode and a stainless steel plate which is used as a negative electrode, and electrolyzing and stirring the desulfurization wastewater; and (2) adding polyacrylamide into the water treated in step (1) for flocculation. According to the method, the desulfurization wastewater with a high chemical oxygen demand (COD) is treated by electrolysis; the desulfurization wastewater contains a great amount of chloride, the chloride ion concentration is generally 8000-20000mg / L, and electrolyte sodium chloride is not required during electrolysis; in the process of electrolysis, oxygen and chlorine are released on the positive electrode; and being new ecological, the released oxygen and chlorine have strong oxidation capacity, so that the organic matters in the wastewater can be decomposed as a result of intense oxidation.

Description

technical field [0001] The invention relates to the technical field of desulfurization wastewater treatment, in particular to a method for treating desulfurization wastewater by electrolysis. Background technique [0002] my country is the world's largest coal producer and consumer. Coal accounts for 76.2% of China's energy structure, and 90% of my country's sulfur dioxide emissions come from coal combustion. Sulfur dioxide and acid rain produced by coal burning have caused huge economic losses to crops, forests, buildings and human health. Therefore, the control of sulfur dioxide emissions is very important. In recent years, flue gas desulfurization of thermal power plants has been rapidly carried out in my country. By the end of 2010, more than 560 million kilowatts of flue gas desulfurization units had been put into operation nationwide, accounting for about 86% of the national coal-fired unit capacity. Among many desulfurization technologies, wet flue gas desulfurizatio...

Claims

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Application Information

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IPC IPC(8): C02F9/06C02F1/56
Inventor 周觅夏纯洁莫建松程常杰
Owner ZHEJIANG TIANLAN ENVIRONMENTAL PROTECTION TECH
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