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Method for removing chemical oxygen demand in wastewater through ozone coupled electro-Fenton catalysis

A chemical oxygen demand and coupled electricity technology, applied in the field of environmental pollution control, can solve the problems of inability to mineralize organic pollutants, secondary pollution, cost increase, etc.

Active Publication Date: 2021-09-10
HUAZHONG NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] (1) As a highly selective oxidant, ozone cannot effectively completely mineralize organic pollutants, and may also cause secondary pollution
[0009] (2) The cost increases after adding hydrogen peroxide, and some reactions need to be coupled
[0010] (3) The electro-Fenton reaction catalytic decomposition of sewage has narrow application scenarios, high by-products and secondary pollution

Method used

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  • Method for removing chemical oxygen demand in wastewater through ozone coupled electro-Fenton catalysis
  • Method for removing chemical oxygen demand in wastewater through ozone coupled electro-Fenton catalysis
  • Method for removing chemical oxygen demand in wastewater through ozone coupled electro-Fenton catalysis

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Example 1: Treatment of high COD pharmaceutical wastewater from a domestic pharmaceutical company

[0048] High COD pharmaceutical wastewater comes from the sewage outlet of a domestic pharmaceutical company. The initial pH value of the sewage is 7.5, and the initial COD concentration is 227ppm. Since the company is an antibiotic pharmaceutical company, there are many residues of antibiotic-like organic pollutants in the sewage.

[0049] Take (without any pretreatment) sewage, each portion is 50mL in a beaker.

[0050] Such as figure 1 As shown, the anode is an iron sheet, the iron sheet is 5cm long, 2cm wide, and 0.5mm thick, and the cathode is graphite felt, 5cm long and 2cm wide; use an air source ozone generator to feed ozone and oxygen into the cathode (the ratio is 1: 50), the control flow rate is 10mL / min; the constant current 32V power supply is connected, and the current density is set to 0.1mA / cm 2 ; The distance between the two electrodes is 2cm. Reactio...

Embodiment 2

[0059] Example 2 Treatment of high-concentration COD sewage from an auto parts company in Shanghai

[0060] High COD sewage comes from the sewage outlet of an auto parts company in Shanghai. The initial pH value of sewage is 10.2, and the initial COD concentration is 42794ppm. Since the company is an auto parts company, the COD concentration of the waste water generated during parts processing is extremely high, and there are many oily substances in the waste water, which seriously corrodes the iron electrodes during electrolysis.

[0061] This scheme adopts contact type ruthenium iridium titanium iron double anode.

[0062] Take (without any pretreatment) sewage, each portion is 100mL in a beaker.

[0063] Such as figure 2 As shown, the double anodes used are ruthenium iridium titanium sheet and iron sheet, and the two electrodes are fixed with stainless steel electrode clips, and the electrode clips do not contact sewage. The ruthenium, iridium, titanium and iron sheets...

Embodiment 3

[0074] Embodiment 3: Treatment of high-concentration COD sewage (after demulsification) of an auto parts company in Shanghai

[0075] (After demulsification) high-concentration COD sewage comes from the sewage outlet of an auto parts company in Shanghai. The sewage in Example 2 is treated with a demulsifier, and the initial COD concentration of the sewage after removing most of the oily substances is lower than that of the sewage before the demulsification to 8205ppm. The initial pH value of sewage is 2.6.

[0076] Take high-concentration COD sewage without any pretreatment (after demulsification), and put 100mL in a beaker each.

[0077]The contact type ruthenium iridium titanium iron double anode is used. The anode is a ruthenium iridium titanium sheet and an iron sheet, and the two electrodes are fixed with a stainless steel electrode clip, and the electrode clip does not touch the sewage. The ruthenium iridium titanium sheet and the iron sheet are both 5cm long, 2cm wid...

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Abstract

The invention discloses a method for removing chemical oxygen demand in wastewater through ozone coupled electro-Fenton catalysis, in a system for removing chemical oxygen demand in wastewater through electro-Fenton catalysis, an anode adopts a blunt anode and iron as contact type double anodes, and a cathode adopts graphite felt; or iron is adopted as the anode, and graphite felt is adopted as the cathode; or a blunt anode and a cathode adopt iron and graphite felt as contact type double cathodes, the electrolyte is used for constructing an electro-Fenton system for sewage to be degraded, constant direct current is externally connected, and an ozone generator is externally connected to introduce ozone into the cathode. Electro-Fenton and ozone oxidation technologies are coupled to quickly degrade organic pollutants in the solution so that efficient removal of COD is realized. The method does not need additional reagents, does not need to adjust the pH value, does not generate secondary pollution, and is very worthy of popularization.

Description

technical field [0001] The invention belongs to the field of environmental pollution control, and mainly relates to a method for efficiently removing chemical oxygen demand (COD) in sewage by using electro-Fenton coupling ozone oxidation technology, which is suitable for the treatment of sewage in industrial, agricultural and medical fields. Background technique [0002] COD (Chemical Oxygen Demand) is the oxygen equivalent of substances (generally organic matter) that can be oxidized by strong oxidants in polluted sewage. One of the comprehensive indicators. A high COD value indicates that the water contains a large amount of reducing substances, mainly organic pollutants. These organic pollutants are difficult to be degraded by microorganisms in the water, and will cause persistent poisoning to aquatic organisms, resulting in a large number of aquatic organisms dying, and the river ecosystem will be destroyed. In addition, if the poisoned aquatic organisms enter the huma...

Claims

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Application Information

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IPC IPC(8): C02F1/461C02F1/72C02F1/78C02F101/30
CPCC02F1/4672C02F2209/08C02F2101/30C02F2305/026
Inventor 张礼知李美琪贾法龙艾智慧
Owner HUAZHONG NORMAL UNIV