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Ultrasonic-assisted bentonite synthesis-free heterogeneous Fenton method for treating organic waste water

A technology of heterogeneous Fenton and organic wastewater, applied in the field of environmental pollution control, can solve the problems of complex synthesis process and low treatment efficiency, and achieve the effects of avoiding loss, improving efficiency and promoting cation exchange

Inactive Publication Date: 2012-10-31
CHANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is: to overcome the shortcomings of complex synthetic process and low treatment efficiency of bentonite-loaded Fenton catalyst in the prior art, and to provide a method for ultrasonically assisted bentonite-free synthesis of heterogeneous Fenton to treat organic wastewater

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Add FeCl directly to 1L of wastewater with a concentration of 30mg / L Golden Orange II 2 、H 2 o 2 and 200 mesh bentonite, Fe 2+ :H 2 o 2 =500:1 (molar ratio), the molar number of ferrous ion charge is 50% of the cation exchange capacity of the added bentonite, the solid-liquid ratio of bentonite and wastewater is 1:10000 (mass ratio), adjust the pH value to 6, the Put the waste water into an ultrasonic reactor, apply ultrasonic waves with a frequency of 120KHz and a power of 1200W, and perform ultrasonic treatment for 1min for purification treatment while stirring. After the reaction is completed, it precipitates and separates solid and liquid. The removal rate of pollutants obtained by measurement is 98.3%; Add the separated solid to the same amount of wastewater, and then add the same amount of H 2 o 2 , adjust the pH value to 6, apply ultrasonic waves of the same frequency and power for 5 minutes, and stir at the same time. After the reaction is completed, preci...

Embodiment 2

[0023] Add FeSO directly to 1L acid red wastewater with a concentration of 30mg / L 4 、H 2 o 2 and 50 mesh bentonite, Fe 2+ :H 2 o 2 =1000:1 (molar ratio), the molar number of ferrous ion charge is 100% of the cation exchange capacity of the added bentonite, the solid-liquid ratio of bentonite and wastewater is 1:1000 (mass ratio), adjust the pH value to 5, and the Put the waste water into an ultrasonic reactor, apply ultrasonic waves with a frequency of 20kHz and a power of 100W, and perform ultrasonic treatment for 5 minutes for purification, while stirring. After the reaction is completed, it precipitates and separates solids and liquids. The removal rate of pollutants measured is 98.6%. ; Add the separated solid to the same amount of waste water, then add the same amount of H 2 o 2 , adjust the pH value to 5~6, apply ultrasonic waves with a frequency of 20kHz and a power of 500W for 1 min, and stir at the same time. After the reaction is completed, precipitation, solid...

Embodiment 3

[0026] Add FeCl directly to 1 L of phenol wastewater with a concentration of 30 mg / L 2 、H 2 o 2 and 100 mesh bentonite, Fe 2+ :H 2 o 2 =800:1 (molar ratio), the molar number of ferrous ion charge is 100% of the cation exchange capacity of the added bentonite, the solid-liquid ratio of bentonite and waste water is 1:2000 (mass ratio), adjust the pH value to 6, the Put the wastewater into an ultrasonic reactor, apply ultrasonic waves with a frequency of 20kHz and a power of 800W, and perform ultrasonic treatment for 3 minutes, while stirring. After the reaction is completed, it precipitates and separates solids and liquids. The removal rate of pollutants measured is 96.5%. ; Add the separated solid to the same amount of waste water, then add the same amount of H 2 o 2 , adjust the pH value to 5.5, apply ultrasonic waves with a frequency of 20kHz and a power of 800W for 4 minutes, and stir at the same time. After the reaction is completed, precipitation, solid-liquid separa...

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Abstract

The invention provides an ultrasonic-assisted bentonite synthesis-free heterogeneous Fenton method for treating organic waste water. The method includes the following steps of (1) directly adding a ferrous ion salt, hydrogen peroxide (H2O2) and bentonite into the waste water, and adjusting the potential of hydrogen (pH) value to 5 to 6; and (2) adding the waste water into an ultrasonic reactor, performing an ultrasonic action for 1 to 5 minutes, then performing a purification treatment, simultaneously stirring, precipitating after reaction, and performing a solid-liquid separation to complete the waste water treatment. The ultrasonic-assisted bentonite synthesis-free heterogeneous Fenton method for treating the organic waste water has the advantages that series of cumbersome synthetic steps of prior bentonite load iron oxide catalysts before application are omitted, the organic waste water purification treatment time is shortened, the efficiency is improved, a cation exchange characteristic of the bentonite is utilized, iron ions can be exchanged to the interlayer of the bentonite while the iron ions exert an catalytic action, the iron ions are prevented from losing, the iron ions in water are prevented from being polluted, the possibility of reutilization is improved, and the reaction can be completed within a short time by the aid of a dispersing function and a cavitation characteristic of ultrasonic waves.

Description

technical field [0001] The invention relates to the technical field of environmental pollution control, in particular to a method for ultrasonic-assisted bentonite-free synthesis-free heterogeneous Fenton treatment of organic wastewater. Background technique [0002] Fenton's reagent generally refers to Fe 2+ and H 2 o 2 The oxidation system formed by the French scientist H.J.H. Fenton was invented in 1894. It is a chemical oxidation water treatment technology that does not require high temperature and high pressure and has simple equipment. Early Fenton reagents were mainly used in organic analytical chemistry and organic synthesis reactions. In 1964, Eisenhouser first used Fenton reaction as a wastewater treatment technology, and succeeded in phenol and alkylbenzene wastewater treatment experiments. The traditional Fenton reaction will cause the loss of iron ions. In order to solve this problem, the heterogeneous Fenton reaction has been gradually developed. This reacti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/72C02F1/36
Inventor 马建锋李良银姚超李定龙
Owner CHANGZHOU UNIV
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