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Electro-catalytic Fenton oxidation-electrochemical oxidation coupling process and device for efficient treatment of chemical wastewater

A technology of Fenton oxidation and chemical wastewater, applied in special compound water treatment, water/sewage treatment, water/sewage multi-stage treatment, etc., can solve the problem that iron sludge cannot be recycled

Active Publication Date: 2020-05-26
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0016] Furthermore, in view of the technical problem that the iron sludge formed by the iron ions produced after Fenton oxidation cannot be recycled, the pH adjustment pool is connected in series with the electrocatalytic Fenton oxidation coupling electrochemical oxidation device, so that the iron sludge is dissolved into iron ions and returned to the The electrochemical oxidation step is reduced to ferrous ions, and the coupled treatment process that realizes near-zero generation of iron sludge

Method used

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  • Electro-catalytic Fenton oxidation-electrochemical oxidation coupling process and device for efficient treatment of chemical wastewater
  • Electro-catalytic Fenton oxidation-electrochemical oxidation coupling process and device for efficient treatment of chemical wastewater
  • Electro-catalytic Fenton oxidation-electrochemical oxidation coupling process and device for efficient treatment of chemical wastewater

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Embodiment 1

[0085] The water quality of the industrial tail water to be treated in this embodiment is the discharge tail water after the biochemical treatment of a certain pesticide production enterprise, the COD content is 200-300mg / L, and the main pollutants are triconazole, tebuconazole, cyclazoles, etc. Nitrogen-containing heterocyclic organic compounds such as rimsulfuron-methyl.

[0086] The coupling process flow and mechanism diagram of "Narrow Channel Electrocatalytic Fenton Oxidation-Narrow Channel Electrochemical Oxidation-pH Adjustment" for advanced treatment of chemical tail water is similar to figure 1 shown in ( figure 1 In the electrocatalytic Fenton oxidation into a tubular electrode, a flat electrode is used in this embodiment; in this embodiment, the electrochemical oxidation cathode adopts a modified graphite porous electrode), including sequentially connected narrow channel electrocatalytic Fenton oxidation units, narrow channel The circulation treatment device formed...

Embodiment 2

[0102] Other conditions and processing object are identical with embodiment 1, difference is:

[0103] The distance between the anode and cathode of the narrow-channel electrocatalytic Fenton oxidation unit in the device is 2cm; the distance between the cathode and anode of the narrow-channel electrochemical oxidation tubular reactor unit is 1cm;

[0104] Tuning the current density in narrow channel electrocatalytic Fenton oxidation to about 13.5-15mA / cm 2 , get ΔCOD and H 2 o 2 The mass ratio of iron (II) to H is about 1:0.75 2 o 2 The molar ratio of is about 1:10, closes the power supply of electrocatalytic Fenton oxidation step after concentration reaches;

[0105] The current density of the narrow-channel electrochemical oxidation tubular reactor unit is about 15mA / cm 2 , The reaction time is 24h.

[0106] Compared with a single electrocatalytic Fenton oxidation direct series pH adjustment unit, the reaction process of the coupling system of "narrow channel electroca...

Embodiment 3

[0112] Other conditions are identical with embodiment 1 with the waste water to be treated, difference is:

[0113] The distance between the cathode and the anode of the tubular electrode (closed space) of the narrow channel electrochemical oxidation unit is 3cm, and the current density is about 20mA / cm 2 .

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Abstract

The invention discloses an electro-catalytic Fenton oxidation-electrochemical oxidation coupling process and device for efficient treatment of chemical wastewater, which belong to the field of sewagetreatment. The method comprises an electro-catalytic Fenton oxidation step, an electrochemical oxidation step and a pH adjustment step. The distance between a cathode and an anode in the electro-catalytic Fenton oxidation step is controlled, so that oxygen generated by the anode reacts at the cathode to generate H2O2; the electro-catalytic Fenton oxidation step is carried out by adopting a narrowchannel, so that oxygen generated by anode oxygen evolution reaction is in contact with the cathode to generate H2O2 for Fenton reaction, the treatment requirement can be met without additionally adding aeration or externally adding H2O2, and meanwhile, the efficiency of efficiently removing COD by electro-Fenton oxidation is effectively improved. Furthermore, a pH regulating tank is connected with an electro-catalytic Fenton oxidation coupling electrochemical oxidation device in series, so that a coupling treatment process for near-zero generation of the iron sludge is realized.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment, and more specifically relates to an electrocatalytic Fenton oxidation-electrochemical oxidation coupling process and a device thereof for efficient treatment of chemical wastewater. Background technique [0002] Nitrogenous Heteraromatic Compounds (NHCs) and Oxygenous Heteraromatic Compounds (OHCs), are refractory toxic and harmful organic compounds, NHCs and OHCs such as cyclic azoles, pyrimidines, pyridines, furans Compounds, etc., are typical chemical industry compounds, and are widely used in medicine, cosmetics, disinfectants, dyes, pesticides and other industries. The wastewater treatment process produced by the production of NHCs and OHCs fine chemicals generally adopts pretreatment processes such as precipitation, air flotation or chemical redox to improve the biodegradability of wastewater, and then undergoes a series of biological treatment processes to make the water quality C...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/06
CPCC02F9/00C02F1/66C02F1/4672C02F1/722C02F2305/026C02F2001/46133C02F2001/46171C02F1/46109C02F2101/38C02F2101/34C02F2201/4614C02F2301/046
Inventor 韩卫清崔韬魏卡佳李维王连军刘晓东孙秀云李健生沈锦优
Owner NANJING UNIV OF SCI & TECH