Method for regulating multistage-cascade induction electro-Fenton by graded addition of H2O2 on basis of pH indication

A technology of H2O2 and induction electricity, applied in the direction of sterilization/microdynamic water/sewage treatment, etc., can solve the problems of decreased treatment efficiency of Fenton technology, waste of input materials, lack of scientific basis, etc., so as to save project implementation costs and improve Utilize efficiency, optimize the effect of implementation parameters

Active Publication Date: 2014-08-13
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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  • Application Information

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Problems solved by technology

[0008] 2. Numerous studies have found that H 2 o 2 There is no direct relationship between the residual concentration and the reaction time, when H 2 o 2 After depletion, the processing efficiency of Fenton technology drops significantly
For example: adding H again 2 o 2 The time point and dosage...

Method used

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  • Method for regulating multistage-cascade induction electro-Fenton by graded addition of H2O2 on basis of pH indication
  • Method for regulating multistage-cascade induction electro-Fenton by graded addition of H2O2 on basis of pH indication
  • Method for regulating multistage-cascade induction electro-Fenton by graded addition of H2O2 on basis of pH indication

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Embodiment 1

[0034] Wastewater from an enterprise (COD about 315mg / L, pH about 6.5) such as figure 1 As shown, the three-stage homogeneous induction electro-Fenton process is adopted, and the residence time of the designed reactor is 30min. H 2 o 2 Concentration C 1 Adjust to 0.02mol / L, pH 0 After being adjusted to 3, it passes through the first-stage induction electric Fenton reactor and then enters the second and third-stage reactors in turn. After connecting the external power supply and running stably for 30 minutes, the pH 0 to pH 3 They were 3, 4.2, 5.3 and 6.5 respectively, and the COD value of the effluent was 235mg / L, which did not meet the third-level standard for wastewater discharge (COD is less than or equal to 100mg / L). found to meet the pH 0 +11 2 n Conditions, take measures 1 to make the following adjustments: At the same time, add H 2 o 2 , such that C 1 0.04mol / L, C 2 0.03mol / L, C 3 It is 0.02mol / L. After adjusting and running for 30 minutes, the pH 0 to pH ...

Embodiment 2

[0038] A chemical factory produces biochemical effluent (COD value is about 450mg / L, pH is about 6.6) using such as figure 2 The shown 4-stage homogeneous induction electro-Fenton process treatment, the design reactor residence time is 20min, the influent pH 0 Adjust to 3, and add H at the same time before the 4th grade reactor 2 o 2 , so that C 1 to C 4 The concentration is 1mol / L. After connecting the external power supply and running stably for 20 minutes, the pH 1 to pH 4 They were 3, 4.1, 5.2, 5.9 and 6.6 in turn, and the COD value of the final effluent was reduced to 180mg / L, but it still did not meet the emission requirements. found to meet the pH 0 +11 2 n Conditions, take measures 1 to adjust as follows: at the same time, adjust the H 2 o 2 Dosage, so that C1 1.5mol / L, C 2 1.5mol / L, C 3 1.5mol / L and C 4 It is 1.5mol / L. After adjusting and running for 20 minutes, the COD value of the effluent is 88mg / L, and the pH 0 to pH 3 3, 3.3, 3.6 and 3.9 respectiv...

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Abstract

The invention discloses a method for regulating multistage-cascade induction electro-Fenton by graded addition of H2O2 on the basis of pH indication, belonging to the field of electrochemical water treatment. The invention is characterized in that the method can determine whether to regulate the concentration value of H2O2 entering multiple stages of induction multistage reactors according to the pH value change and determine the concentration of H2O2 of each stage to be regulated. The method mainly comprises the following steps: regulating influent water entering the first-stage induction electro-Fenton reactor, H2O2 concentration and pH value while controlling the total hydraulic retention time Tn of all stages of induction electro-Fenton reactors at 0.1-12 hours, introducing treated water into all stages of cascade induction electro-Fenton reactors, and switching on the external power supply; and when the stable operation time of the system is greater than or equal to Tn, comparing the pH values of all stages, and performing corresponding treatment. The method effectively solves the problems that the high-to-low turning point of the induction electro-Fenton treatment efficiency can not be easily determined and the H2O2 addition time can not be easily determined in the organic wastewater treatment in the electro-Fenton oxidation technique.

Description

technical field [0001] The present invention relates to an electrochemical water treatment method, in particular to a pH indicator-based dosing H 2 o 2 A method for regulating a multistage series-induced electro-Fenton. Background technique [0002] Inductive electro-Fenton technology is a method in the field of electrochemical advanced oxidation technology that uses sacrificial iron anode and external source of H 2 o 2 A high-efficiency water treatment technology that generates hydroxyl radicals (OH) through Fenton reaction to oxidize organic matter to degrade it. Due to its wide application range, strong oxidation capacity and stable treatment effect, it has been widely used in the field of industrial wastewater treatment and disposal, especially in the field of refractory organic industrial wastewater treatment. However, in recent years, with the rapid development of wastewater treatment technology demand in various industries in my country, how to deal with the varia...

Claims

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Application Information

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IPC IPC(8): C02F1/467
Inventor 刘锐平孙猛曲久辉兰华春
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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