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Method for organic wastewater electro-fenton treatment adopting bentonite

A technology of organic wastewater and bentonite, applied in the field of environmental pollution control, can solve the problems of difficult removal of iron ions, low efficiency of pollutant removal, complicated process of bentonite loading iron catalyst, etc., and achieve the effect of saving electric energy and promoting decomposition

Active Publication Date: 2013-02-27
江阴智产汇知识产权运营有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved in the present invention is: to overcome the deficiencies in the prior art that the iron ions produced by electro-fenton are difficult to remove, the removal efficiency of pollutants is low, and the process of bentonite-loaded iron catalyst is complicated, and provide an electro-fenton-treated organic wastewater method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Add dye orange II wastewater with a concentration of 30mg / L in the electrolytic cell, and then add dry bentonite crushed through a 100-mesh sieve. The solid-liquid mass ratio of bentonite and wastewater is 1:500, and 0.2mL of H 2 o 2 (30%, mass fraction), the anode electrode of the electrolytic cell is an iron sheet electrode, the cathode is a graphite electrode, the electrolytic cell is connected to a current of 40mA, and after every 20min, it is disconnected for 40min, and the cycle operation is continued throughout the process. Stirring speed After a total time of 3 hours, the organic matter in the wastewater was oxidized and degraded, precipitated and separated, and the concentration of pollutants in the wastewater was analyzed. The removal rate reached 98.7%, and the residual iron ion concentration in the wastewater was 1.4mg / L.

[0021] After the precipitated bentonite was dried at 105°C, it was used as a catalyst to treat wastewater. Add 1 g of the precipitated b...

Embodiment 2

[0025] Add dye acid red wastewater with a concentration of 25mg / L into the electrolytic cell, and then add dry bentonite crushed through a 50-mesh sieve. The solid-liquid mass ratio of bentonite and wastewater is 1:100, and 0.1mLH 2 o 2 (30%, mass fraction), the anode electrode of the electrolytic cell is an iron sheet electrode, the cathode electrode is a graphite electrode, the electrolytic cell is connected to a current of 5mA, and after every 15 minutes, it is disconnected for 30 minutes, and the cycle operation is continued throughout the process. The rotation speed is 50r / min, and after a total time of 6 hours, the organic matter in the wastewater is oxidized and degraded, precipitated and separated, and the concentration of pollutants in the wastewater is analyzed. The removal rate reaches 99.1%, and the residual iron ion concentration in the wastewater is 2.1mg / L.

[0026] After the precipitated bentonite was dried at 105°C, it was used as a catalyst to treat wastewate...

Embodiment 3

[0030] Add phenol wastewater with a concentration of 15 mg / L into the electrolytic cell, and then add dry bentonite crushed through a 100-mesh sieve. The solid-liquid mass ratio of bentonite and wastewater is 1:500, and 0.1 mL of H 2 o 2 (30%, mass fraction), the anode electrode of the electrolytic cell is an iron sheet electrode, the cathode electrode is a graphite electrode, the current of the electrolytic cell is 40mA, and after every 20min, it is disconnected for 40min, and the cycle operation is continued throughout the process. The rotation speed is 100r / min. After a total time of 5 hours, the organic matter in the wastewater is oxidized and degraded, precipitated and separated, and the concentration of pollutants in the wastewater is analyzed. The removal rate reaches 96.7%, and the residual iron ion concentration in the wastewater is 1.7mg / L.

[0031]After the precipitated bentonite was dried at 105°C, it was used as a catalyst to treat wastewater. Add 1 g of the preci...

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PUM

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Abstract

The invention provides a method for organic wastewater electro-fenton treatment adopting bentonite. The method comprises the following steps of 1, adding organic wastewater in an electrolytic cell, 2, adding dried bentonite into the electrolytic cell, 3, adding 0.1 to 0.2mL of a H2O2 solution into each liter of the organic wastewater, and 4, electrifying in the electrolytic cell at an electrolytic cell current of 5 to 40mA with continuous stirring for 3 to 6 hours so that organics in the organic wastewater are degraded by oxidation and is precipitated and separated, wherein an anode of the electrolytic cell is an iron sheet electrode; a cathode is a graphite electrode; after being carried out for 15 to 20min, an electrifying process is stopped for 30 to 40min and the electrifying cycle is repeated; and a stirring rate is in a range of 50 to 150r / min. Organic wastewater treated by the method satisfies discharge standards. Through cation exchange performances of bentonite, iron ions produced by electrolysis are transferred to bentonite layers so that the concentration of iron ions residual in wastewater is reduced and iron ion-modified bentonite having catalytic activity is obtained.

Description

technical field [0001] The invention relates to the technical field of environmental pollution control, in particular to a method for treating organic wastewater by electro-fenton with the participation of bentonite. Background technique [0002] Discovered by Fenton in 1894, ferrous ion (Fe 2+ ) to hydrogen peroxide (H 2 o 2 ) catalyst, which produces a free radical with high oxidizing ability, (hydroxyl radical, OH), and finally oxidizes the organic matter in the wastewater into carbon dioxide and water to eliminate pollution. Fe produced by electrochemical method 2+ and H 2 o 2 As a continuous source we call it the electrolytic Fenton method. When the electrolyzer is energized, the iron anode loses two electrons and is oxidized to Fe 2+ ,Fe 2+ with added H 2 o 2 A Fenton reaction occurs to generate OH. [0003] In this system, besides OH, the factors leading to the degradation of organic matter also include Fe 2+ , Fe 3+ , although some Fe 2+ , Fe 3+ Can be...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/461C02F1/28
Inventor 马建锋邹静姚超李定龙
Owner 江阴智产汇知识产权运营有限公司
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