Method for organic wastewater electro-fenton treatment adopting bentonite

A technology of organic waste water and bentonite, which is applied in the field of environmental pollution control, can solve the problems of difficult removal of iron ions, low pollutant removal efficiency, complicated process of bentonite-supported iron catalyst, etc., and achieves the effect of promoting decomposition and saving electric energy.

Active Publication Date: 2014-04-30
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 to the electrolytic cell, and then add dry bentonite crushed through a 100-mesh sieve. The solid-liquid mass ratio of bentonite to wastewater is 1:500. Add 0.2mLH per liter of wastewater. 2 O 2 (30%, mass fraction), the anode electrode of the electrolytic cell is an iron sheet electrode, and the cathode is a graphite electrode. The electrolytic cell current is connected to 40mA. After every 20min, it is disconnected for 40min, and the cycle is operated. Stirring is continued during the whole process. It is 150r / min. After a total time of 3h, the organic matter in the wastewater is oxidized and degraded, separated by precipitation, and the concentration of pollutants in the wastewater is analyzed. The removal rate reaches 98.7%, and the residual iron ion concentration in the wastewater is 1.4mg / L.

[0021] After the bentonite obtained by precipitation is dried at 105°C, it is used as a catalyst to continue to treat w...

Embodiment 2

[0025] Add dye acid red wastewater with a concentration of 25mg / L to the electrolytic cell, and then add dry bentonite crushed through a 50-mesh sieve. The solid-liquid mass ratio of bentonite to wastewater is 1:100, and 0.1mLH is added to each liter of wastewater. 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 current is connected to 5mA, after every 15min, disconnected for 30min, cycle operation, continuous stirring and stirring throughout the process The rotation speed is 50r / min. After a total time of 6h, 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 bentonite obtained by precipitation is dried at 105°C, it is used as a catalyst...

Embodiment 3

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

[0031] After the bentonite obtained by precipitation is dried at 105°C, it is used as a catalyst to continue t...

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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, and 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 ions (Fe 2+ ) Is hydrogen peroxide (H 2 O 2 ), which produces a kind of free radicals with high oxidizing ability, (hydroxide free radicals, ·OH), which ultimately oxidizes the organic matter in the wastewater to 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 electrolytic cell is energized, the iron anode loses two electrons and is oxidized to Fe 2+ ,Fe 2+ With joined H 2 O 2 The Fenton reaction generates ·OH. [0003] In this system, the factors that cause the degradation of organic matter are not only ·OH, but also Fe 2+ , Fe 3+ , Although part of Fe 2+ , Fe 3+ Can b...

Claims

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Application Information

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Patent Type & AuthorityPatents(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