Method for treating active scarlet BES (Biological Electrochemical System) dye wastewater by using intermittent pulsed current electric flocculation technology

A technology of active scarlet and technical treatment, applied in water/sewage treatment, chemical instruments and methods, textile industry wastewater treatment, etc., can solve problems such as high energy consumption, electrode passivation, and reduced treatment efficiency, and achieve simple equipment and ease Concentration polarization and the effect of reducing power supply time

Active Publication Date: 2015-07-01
江苏通瑞环保科技发展股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the main problem at present is that the energy consumption is high, and concentration polarization is prone to occur in the reaction process, which leads to electrode passivation and reduces the processing efficiency.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0007] Example 1: The active scarlet BES wastewater content is 300mg / L, the pH value is adjusted to 4, the conductivity is 1500us / cm, the cathode and anode adopt aluminum electrodes, the distance between the plates is 0.5cm, and the average current density is 12mA / cm 2 , the duty cycle of the single pulse power supply is 0.6, the frequency is 0.5KHz, the power-on period is 0.5ms, the power-off period is 0.3ms, the electrolysis time is 40min, the static settling time is 30min, the centrifugation time is 10min, and the treated active scarlet BES wastewater is decolorized The rate is 96.5%, and the COD removal rate is 97.1%.

Embodiment 2

[0009] Example 2: The active scarlet BES wastewater content is 300mg / L, the pH value is adjusted to 6, the conductivity is 1000us / cm, the cathode and anode adopt iron electrodes, the distance between the plates is 3cm, and the average current density is 6mA / cm 2 , the duty cycle of the double pulse power supply is 0.7, the frequency is 1KHz, the power-on period is 0.8ms, the power-off period is 0.5ms, the electrolysis time is 35min, the static settling time is 30min, and the centrifugation time is 10min. The decolorization of the treated active scarlet BES wastewater The rate is 98.7%, and the COD removal rate is 99.3%.

[0010] Comparative example: the wastewater of the same type, concentration, and pH value as above is electrolyzed with a DC power supply, and the decolorization rate of the treated wastewater is 94.9%, and the COD removal rate is 96.8%. After calculation, the power consumption increases by 21.3%.

Embodiment 3

[0011] Example 3: The active scarlet BES wastewater content is 300mg / L, the pH value is adjusted to 3, the conductivity is 3000us / cm, the anode uses an aluminum electrode, the cathode uses an iron electrode, the distance between the plates is 0.4cm, and the average current density is 18mA / cm 2 , the single-pulse power supply duty cycle is 1, the frequency is 2KHz, the power-on period is 1ms, the power-off period is 1ms, the electrolysis time is 40min, the static settling time is 33min, and the centrifugation time is 15min. The decolorization rate of the treated active scarlet BES wastewater is 97.3%, COD removal rate is 97.8%.

[0012] Comparative example: the above-mentioned wastewater of the same type, concentration, and pH value is electrolyzed with a DC power supply, and the decolorization rate of the treated wastewater is 96.1%, and the COD removal rate is 95.2%. After calculation, the power consumption increases by 23.3%.

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Abstract

The invention discloses a method for treating active scarlet BES (Biological Electrochemical System) dye wastewater by using an intermittent pulsed current electric flocculation technology. The method comprises the following steps of: firstly, adjusting the pH value of the wastewater to 3-7 and the conductivity to 700-3000us / cm; then, carrying out electric flocculation treatment; controlling the output current density at 3.5-18mA / cm<2>, the polar plate distance at 0.4-4cm, the electrolysis time at 30-40min and the sediment time at 30-35min by using a pulsed power supply; and carrying out centrifugal treatment after the reaction is ended, wherein the centrifuging time is 8-15min. The method has the advantages that the intermittent power supply mode of the pulsed power supply is as follows: connection-disconnection-connection; and ions on the surface of a pole under the mode are well diffused during disconnection, the mass transfer effect is improved, the concentration polarization is relieved, and furthermore, the defects of poor treatment effect and electricity energy waste caused by pole passivation are overcome to a great extent.

Description

technical field [0001] The invention relates to a treatment method of dye waste water, in particular to a method for treating reactive scarlet BES dye waste water by using intermittent pulse electrocoagulation technology. Background technique [0002] Reactive bright red BES is a kind of reactive dyes, reactive dyes, also known as reactive dyes, is a new type of dyes. Reactive dye molecules mainly include two components: parent dye and active group. Among them, the active group can react with the fiber and form a covalent bond with the fiber to form a whole, which improves the washing and rubbing fastness of the dye. This kind of wastewater has deep color, high content of organic pollutants, high biological toxicity, difficult biodegradation, strong resistance to photolysis and oxidation. At the same time, there are many kinds of raw materials and complicated processes for the production of reactive dyes. Wastewater, which makes the components of wastewater complex, increas...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/06C02F1/463C02F1/66C02F1/38C02F103/30
Inventor 陆君刘玉玲潘龙陆鸿飞李艳马晓云
Owner 江苏通瑞环保科技发展股份有限公司
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