Method for electrolyzing organic waste water using iridium tantalum stannum oxide coating titanium electrode

A tin oxide, electrolytic treatment technology, applied in the field of electrochemistry and environmental chemistry, can solve problems such as electrode life

Inactive Publication Date: 2007-05-16
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The existing problems are mainly two problems: one is the problem of wastewater treatment time, that is, how to improve the effic...

Method used

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  • Method for electrolyzing organic waste water using iridium tantalum stannum oxide coating titanium electrode
  • Method for electrolyzing organic waste water using iridium tantalum stannum oxide coating titanium electrode

Examples

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Effect test

Embodiment 1

[0019] Example 1 Direct current electrolytic treatment of actual oil refinery wastewater. The initial COD value is 90mg / L. Using electrodes as SnO 2 / IrO 2 -Ta 2 o 5 / Ti, NaCl concentration 5%, current density 1600A m -2 , anode area 5cm -2 , The distance between the plates is 0.5cm. After 10 minutes of electrolysis, the removal rate of COD value reached 92.8%. From 10 to 45 minutes, the COD remained basically unchanged. The relationship between processing time and COD is shown in Figure 2.

Embodiment 2

[0020] Example 2 Direct current electrolytic treatment of actual ethylene production wastewater. The initial COD value is 50mg / L. The electrode used is SnO 2 -IrO 2 -Ta 2 o 5 / Ti, NaCl concentration 0.1%, current density 1600A m -2 , anode area 5cm -2 , plate spacing 1cm. The concentration of NaCl added is very low, and after 1 minute of electrolysis, the removal rate of COD value reaches 90.8%. The water quality standard complies with the requirements for boiler circulating water. Calculate the electric energy consumed by the electrolysis of 1 ton of this ethylene waste water to be 2.0 degrees. The relationship between processing time and COD is shown in Figure 3.

Embodiment 3

[0021] Example 3 Pulse electrolysis treatment of ethylene wastewater, comprehensive wastewater and ethylene synthesis hexanediol wastewater of a petrochemical company. Using electrodes as SnO 2 -IrO 2 -Ta 2 o 5 / Ti, anode area 4cm -2 , plate spacing 1cm. Using sawtooth wave, the peak current density is 2500Am -2 , The pulse period is 1ms, the on-off ratio is 1:1 and the additional DC component is 0. The test results show that the solid matter (SS) and turbidity of the organic wastewater before electrolysis have basically met the water reuse standard, but it is still difficult to completely remove the COD and chroma in the wastewater. Pulse current electrolysis is used to treat organic wastewater. After electrolysis, COD, chroma, and solid matter (SS) of organic wastewater can be effectively removed. Among them, the COD of organic wastewater can basically meet the standard of reclaimed water reuse (COD is lower than 20mg / L), especially the COD of comprehensive wastewater...

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Abstract

The invention discloses an organic waste water disposing method through coating electrode electrolytic disposal of iridium tantalum tin oxide in the electrochemical and environmental chemical technique domain, which is characterized by the following: adding additive in the electrolytic procedure; adopting DC or pulse current with DC density at 1000-2000A .m-2 and electrode board gap at 0.3-1.0cm; possessing saw pulse current with peak current density at 1200-3000A .m-2 and pulse period at 0.5-2.0ms; setting the on-off rate at 1: 3-3: 1 with auxiliary DC component at 0-1000A .m-2 and electrode board gap at 0.5-1.5cm.

Description

technical field [0001] The invention belongs to the technical field of electrochemistry and environmental chemistry, and particularly relates to a method for efficiently electrolytically treating organic wastewater by using nanocrystalline iridium-tantalum-tin oxide-coated titanium electrodes, adding additives for synergistically oxidizing organic matter, and direct current or pulse current electrolysis. . Background technique [0002] Electrolytic treatment of organic wastewater is a comprehensive treatment method of redox, decomposition, coagulation and precipitation. Because of its non-secondary pollution, rapidity and simplicity, it has been extensively studied in recent years. The selection of electrode materials in electrolytic treatment of wastewater is very important. Improper selection can reduce the efficiency of electrolysis, the treatment effect cannot meet the requirements, and the power consumption will increase. The methods currently used for electrolytic tr...

Claims

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Application Information

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IPC IPC(8): C02F1/461C25B11/06
Inventor 孟惠民孙冬柏俞宏英樊自栓王旭东
Owner UNIV OF SCI & TECH BEIJING
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