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Treatment method of organic wastewater through synthesis-free heterogeneous Fenton treatment

A technology of heterogeneous Fenton and organic wastewater, applied in the field of environmental pollution control, can solve problems such as low treatment efficiency and complex synthesis process, and achieve the effects of avoiding loss, improving efficiency, and shortening purification treatment time

Inactive Publication Date: 2012-11-07
CHANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved in 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 treatment method for organic wastewater treatment without synthesis of heterogeneous Fenton

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Add FeCl directly to 1L of wastewater with a concentration of 30mg / L Golden Orange II 2 、H 2 o 2 and 50 mesh bentonite powder, 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, and stir the reaction 10min, solid-liquid separation, the removal rate of the measured pollutants was 91.1%; the separated solids were recycled, added to the same amount of waste water, and added the same amount of H 2 o 2 , adjust the pH value to 6, stir the reaction for 10 minutes, separate the solid and liquid from the precipitation, and the removal rate of the pollutants obtained is 90.6%.

[0015] For the same wastewater, under the same conditions, adding FeCl 2 and H 2 o 2 , but without adding bentonite, in the same treatment time, the pollutant removal rate was 75.1%, and the Fe 2+ Cannot be ...

Embodiment 2

[0017] Add FeSO directly to 1L concentration of 30mg / L methylene blue wastewater 4 、H 2 o 2 and 200 mesh bentonite powder, 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 stir the reaction 5min, solid-liquid separation, the removal rate of the measured pollutants was 93.8%; the separated solids were recycled, added to the same amount of waste water, and added the same amount of H 2 o 2 , adjust the pH value to 5, stir the reaction for 5 minutes, and separate the solid and liquid from the precipitate. The removal rate of the pollutants obtained is determined to be 92.7%.

[0018] For the same wastewater, under the same conditions, adding FeSO 4 and H 2 o 2 , but without adding bentonite, in the same treatment time, the removal rate of pollutants was 71.3%, and Fe 2+ Cannot ...

Embodiment 3

[0020] Add FeCl directly to 1 L of phenol wastewater with a concentration of 30 mg / L 2 、H 2 o 2 and 200 mesh bentonite powder, 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 wastewater is 1:2000 (mass ratio), adjust the pH value to 6, and stir the reaction 10min, solid-liquid separation, the removal rate of the measured pollutants was 95.1%; the separated solids were recycled, added to the same amount of waste water, and added the same amount of H 2 o 2 , adjust the pH value to 5, stir the reaction for 10 minutes, separate the solid and liquid from the precipitation, and the removal rate of the pollutants obtained is 93.6%.

[0021] For the same wastewater, under the same conditions, adding FeCl 2 and H 2 o 2 , but without adding bentonite, in the same treatment time, the pollutant removal rate was 61.9%, and Fe 2+ Cannot be reused.

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Abstract

The invention provides a treatment method of organic wastewater through synthesis-free heterogeneous Fenton treatment. The treatment method comprises the following steps of directly adding ferrous ion salt, H2O2 and bentonite powder in waste water, enabling solid-liquid mass ratio of bentonite and the waste water to be 1:1000-10000, enabling ferrous ionic charge mole number to be 50-100% of added bentonite cation exchange capacity, enabling molar ratio of Fe2+ and the H2O2 to be 500-1000:1, adjusting the pH value to be 5-6, stirring and reacting for 5-10min, conducting solid-liquid separation, and enabling the waste water to be discharged after reaching the standard. A series of complex synthesis steps of an original bentonite loaded ferric oxide catalytic agent before application are removed. Purification treatment time of the organic wastewater is shortened, and efficiency is improved. Cation exchange characteristics of the bentonite is used, iron ion is exchanged to a bentonite layer while the iron ion expresses catalytic action, loss of the iron ion is avoided, pollution of the iron ion in water is avoided, and possibility of reutilization is improved.

Description

technical field [0001] The invention relates to the technical field of environmental pollution control, in particular to a method for treating organic wastewater free from synthesis and heterogeneous Fenton treatment. Background technique [0002] Fenton's reagent generally refers to Fe 2+ and H 2 o 2 The oxidation system constituted, invented by French scientist H.J.H.Fenton in 1894, 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 reaction system usually loads th...

Claims

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Application Information

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