Method for regenerating saturated active carbon adsorbing organic matters through microwave activation of potassium persulfate

A technology of potassium persulfate and microwave activation, applied in chemical instruments and methods, filter regeneration, separation methods, etc., can solve the problems of severe reaction between hydrogen peroxide and ferrous ions, inability to achieve complete desorption of adsorbate, and increased difficulty in operation , to achieve the effects of improving microwave utilization, shortening regeneration time, and short oxidation time

Inactive Publication Date: 2013-08-21
DONGHUA UNIV
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

However, the activated carbon for adsorbing dye wastewater is difficult to degrade the dye molecules, and the single advanced oxidation technology cannot achieve complete desorption of the adsorbate, and the regeneration is not complete.
At present, there are also some patent applications for the technology of regenerating activated carbon by advanced oxidation method, but when the Fenton reagent is regenerated, hydrogen peroxide reacts violently with ferrous ions, which is difficult to control in industry, and the pH is required to be in the range of 1 to 3, which increases the difficulty of operation.

Method used

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  • Method for regenerating saturated active carbon adsorbing organic matters through microwave activation of potassium persulfate
  • Method for regenerating saturated active carbon adsorbing organic matters through microwave activation of potassium persulfate
  • Method for regenerating saturated active carbon adsorbing organic matters through microwave activation of potassium persulfate

Examples

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Effect test

Embodiment 1

[0028] Take new activated carbon into a 500mL Erlenmeyer flask, then pour 300mL of dye biochemical wastewater into the horizontal oscillator at a frequency of 120 rpm for adsorption, and continuously replace the dye wastewater until the activated carbon is saturated, take it out, filter it and dry it at 50°C. Take 5 grams of dried saturated carbon in a polytetrafluoroethylene tank, add potassium persulfate solution so that the mass ratio of activated carbon to potassium persulfate is 1:1, put it in a microwave oven, adjust the power of the microwave digestion instrument to 200W, and irradiate for 10 minutes . Pour out the activated carbon after cooling, rinse the activated carbon with clean water, filter out excess water and dry the activated carbon. Weigh 1 gram of dry regenerated carbon, add 100mL dye wastewater into a 250mL Erlenmeyer flask, oscillate and absorb on a horizontal oscillator at a frequency of 120 rpm for 120min, measure the COD of the wastewater, calculate the...

Embodiment 2

[0031] The same activated carbon as in Example 1 was placed in an activated carbon adsorption tower to absorb dye biochemical wastewater, and it reached full saturation after half a year of continuous operation. Pump 5% potassium persulfate solution into the adsorption tower, and regenerate it by microwave irradiation. After the regeneration is completed, pump clean water for backwashing, wherein the mass ratio of potassium persulfate to activated carbon is 0.6:1, the microwave power is 200W, and the microwave temperature is 90°C. The COD after wastewater adsorption treatment was measured, and the regeneration efficiency was calculated to be 68.3%.

Embodiment 3

[0033] The same activated carbon as in Example 1 was placed in an activated carbon adsorption tower to absorb dye biochemical wastewater, and it reached full saturation after half a year of continuous operation. Pump 5% potassium persulfate solution into the adsorption tower, and regenerate it by microwave irradiation. After the regeneration is completed, clean water is pumped in for backwashing. The mass ratio of potassium persulfate to activated carbon is 0.6:1, the microwave power is 400W, and the microwave temperature is 90°C. The COD after wastewater adsorption treatment was measured, and the regeneration efficiency was calculated to be 78.21%.

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Abstract

The invention relates to a method for regenerating saturated active carbon adsorbing organic matters through microwave activation of potassium persulfate. The method comprises the following steps of: adding a potassium persulfate solution into saturated active carbon; performing microwave irradiation for 5 to 30 minutes; cooling to room temperature; and filtering and cleaning to obtain regenerated carbon, wherein the mass ratio of the saturated active carbon to the potassium persulfate is (1-5):1. Compared with the traditional active carbon regeneration method, the method has the advantages that the regeneration cost is reduced and the regeneration efficiency is improved. Advanced oxidation and microwave irradiation of persulfate are organically combined, so the regeneration efficiency of the active carbon is improved. A chemical catalyst is not used, so new pollutants are not introduced. Due to the action of microwave, the oxidation time is short, the regeneration time is shortened, and the regeneration efficiency is improved and can reach about 80 percent. According to the method, regeneration can be performed for times, namely more than eight times, and the mass loss and the strength loss of the active carbon after regeneration are small.

Description

technical field [0001] The invention belongs to the field of regeneration of saturated activated carbon, and in particular relates to a method for regenerating and adsorbing organic matter saturated activated carbon by activating potassium persulfate with microwaves. Background technique [0002] Activated carbon has a highly developed pore structure and a large specific surface area. It is an excellent adsorbent and can be used for drinking water purification and advanced treatment of wastewater. It can effectively remove the color, odor, heavy metals and organic matter of wastewater. When the activated carbon is saturated, it loses its original adsorption activity and becomes waste carbon. If waste charcoal is not treated and recycled, it will not only cause waste of resources, but also cause secondary pollution to the environment. Therefore, it is very necessary to choose the appropriate technology for activated carbon regeneration, no matter from the perspective of econ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/34B01J20/20B01J19/12
Inventor 陈泉源谭德俊石文静张慧慧钱吉苓杜申
Owner DONGHUA UNIV
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