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Method for treating phenol wastewater by using intermittent pulse electrocoagulation technology

A technical treatment, pulse electricity technology, applied in the field of intermittent treatment of phenol wastewater by pulse electrocoagulation, can solve the problems of reduced treatment efficiency, electrode passivation, high energy consumption, etc., to reduce power supply time, alleviate concentration polarization, and simple equipment Effect

Active Publication Date: 2015-04-08
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

[0008] Example 1: The content of phenol wastewater is 200mg / L, the pH value is adjusted to 5, the conductivity is 600us / cm, the cathode and anode adopt iron electrodes, the distance between the plates is 0.6cm, and the average current density is 4.0mA / cm 2 , the duty ratio of the single pulse power supply is 0.4, the frequency is 1KHz, the power-on period is 0.6ms, the power-off period is 0.4ms, the electrolysis time is 35min, the static settling time is 45min, the centrifugation time is 15min, and the phenol content after treatment is 6.2mg / L.

Embodiment 2

[0010] Example 2: The content of phenol wastewater is 200mg / L, the pH value is adjusted to 6.5, the conductivity is 1000us / cm, the cathode and anode are aluminum electrodes, the distance between the plates is 1cm, and the average current density is 3.5mA / cm 2 , the duty cycle of the single pulse power supply is 0.8, the frequency is 2KHz, the power-on period is 0.8ms, the power-off period is 0.6ms, the electrolysis time is 30min, the static settling time is 35min, the centrifugation time is 15min, and the phenol content after treatment is 5.6mg / L.

[0011] Comparative example: the wastewater of the same type, concentration, and pH value above is electrolyzed by DC power supply, and the phenol content after treatment is 6.7mg / L. After calculation, the power consumption increases by 21%.

Embodiment 3

[0012] Example 3: The content of phenol wastewater is 200mg / L, the pH value is adjusted to 4, the conductivity is 2000us / cm, the anode uses aluminum electrodes, the cathode uses iron electrodes, the distance between the plates is 0.5cm, and the average current density is 15mA / cm 2 , the duty cycle of the single pulse power supply is 0.3, the frequency is 0.5KHz, the power-on period is 0.5ms, the power-off period is 0.4ms, the electrolysis time is 60min, the static settling time is 30min, the centrifugation time is 13min, and the phenol content after treatment is 4.8mg / L.

[0013] Comparative example: the waste water of the same type, concentration, and pH value above is electrolyzed by DC power supply, and the phenol content after treatment is 6.3mg / L. After calculation, the power consumption increases by 40.1%.

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Abstract

The invention discloses a method for treating phenol wastewater by using an intermittent pulse electrocoagulation technology. The method comprises the steps of: firstly adjusting the phenol wastewater to have the pH of 4-7 and the conductivity of 500-2,000 us / cm; then carrying out electrocoagulation treatment, wherein a single-pulse power supply is used for controlling the output current density to be 2-15 mA / cm<2>, the pole plate spacing is 0.5-3 cm, the electrolysis time is 15-60 min, and the static settling time is 30-45 min; and carrying out centrifugation for 5-15 min after the reaction is completed. The method has the advantages that the diffusion of ions in a matrix solution is good due to the intermittent power supply mode of a pulse power supply, the mass transfer effect is improved, and the concentration polarization is alleviated, thus the disadvantages of poor treatment effect and power waste caused by electrode passivation are overcome to a great extent. Meanwhile, compared with direct-current power supply electrocoagulation, the pulse electrocoagulation has the advantages that the power supplying time is reduced, and the energy consumption is reduced.

Description

technical field [0001] The invention relates to a method for treating phenol wastewater, more specifically to a method for intermittently treating phenol wastewater by pulse electrocoagulation. Background technique [0002] Phenol, also known as carbolic acid, is a highly toxic substance that is highly corrosive to human tissues. If it is discharged into water, it will cause immeasurable adverse effects. At present, phenol-containing wastewater mainly comes from coking plants, petrochemical plants, resin factories, insulating material factories, spice factories, plastic factories, etc. This kind of wastewater is difficult to treat due to its high toxicity and high COD properties. Traditional phenol wastewater treatment processes include adsorption, activated sludge, oxidation, and extraction. The adsorption method has the problems of difficult desorption and difficult utilization of desorbed substances; the activated sludge method has high requirements for operation and man...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/463C02F9/06
Inventor 陆君陆鸿飞潘龙李艳马晓云
Owner 江苏通瑞环保科技发展股份有限公司
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