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Method for improving COD (Chemical Oxygen Demand) degradation efficiency and biochemical property of wastewater

A technology for degradation efficiency and waste water, applied in chemical instruments and methods, water/sewage treatment, special compound water treatment, etc., can solve problems that limit the practical application of waste water treatment, achieve improved electrolysis efficiency, biochemical properties, and good results Effect

Inactive Publication Date: 2016-12-21
WUXI ZHONGTIAN SOLID WASTE DISPOSAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] At present, fenton oxidation, ozone oxidation, and electrochemical advanced oxidation technologies have been widely used in wastewater treatment, but each has some shortcomings and limitations, which limit the practical application of wastewater treatment; for wastewater with high COD and difficult to biochemical Features, combining fenton oxidation, ozone oxidation and electrocatalytic oxidation, learning from each other, can efficiently treat this type of wastewater

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Put 1L of waste water with an initial COD of 89000mg / L and BOD / COD less than 0.05 through fenton oxidation (the amount of ferrous sulfate is 10g, and hydrogen peroxide is 25ml), react at a pH of 4 for 1.5h, adjust the pH to 8.2, and filter , after the filtrate was oxidized with ozone for 1h, sodium chloride was added, the dosage was 0.5wt%, the titanium iridium-ruthenium plate was used as the anode, the stainless steel plate was used as the cathode, and the current density was 1.5A / dm 2 Conduct electrolysis for 3 hours. After the treatment, the COD of the effluent is 15575mg / L, the COD removal rate is 82.5%, and the BOD / COD is 0.42.

Embodiment 2

[0027] 1L of wastewater with an initial COD of 96000mg / L and a BOD / COD of less than 0.05 was first oxidized by fenton (12g of ferrous sulfate and 40ml of hydrogen peroxide), reacted at pH 4 for 1.5h, and then adjusted the pH to 8. Filtrate, after the filtrate is oxidized with ozone for 1h, add sodium chloride, the dosage is 1wt%, with the titanium iridium-ruthenium plated plate as the anode, the stainless steel plate as the cathode, and the current density as 2A / dm 2 Perform electrolysis for 4 hours. After the treatment, the COD of the effluent is 18240mg / L, the COD removal rate is 81%, and the BOD / COD is 0.41.

Embodiment 3

[0029] 1L of wastewater with an initial COD of 96000mg / L and a BOD / COD of less than 0.05 is first oxidized by fenton (the amount of ferrous sulfate is 12g, hydrogen peroxide is 50ml), under the condition of pH 4, after 1.5h of reaction, adjust the pH to 8.4 , filtered, after the filtrate was oxidized with ozone for 1h, sodium chloride was added, and the dosage was 1wt%. The titanium iridium-ruthenium plate was used as the anode, the stainless steel plate was used as the cathode, and the current density was 2A / dm 2 Conduct electrolysis for 2 hours. After the treatment, the COD of the effluent is 15168mg / L, the COD removal rate is 84.2%, and the BOD / COD is 0.44.

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Abstract

The invention discloses a method for improving COD (Chemical Oxygen Demand) degradation efficiency and a biochemical property of wastewater. The method adopts a fenton oxidization-ozone oxidization-electrocatalytic oxidation combined method, and comprises the following steps: (1) firstly, carrying out oxidization on the wastewater by adopting a fenton oxidization method; (2) secondly, oxidizing the wastewater through ozone; (3) finally, carrying out electrocatalytic oxidation on the wastewater. The method disclosed by the invention can be used for oxidizing the wastewater for a plurality of times and the limitation of a single method is made up, so that treatment range and capability are improved.

Description

technical field [0001] The invention relates to the technical field of wastewater treatment, in particular to a method for jointly treating high-COD and difficult-to-biochemical wastewater by using fenton oxidation-ozone oxidation-electrocatalytic oxidation. Background technique [0002] In recent years, with the rapid development of modern industry, the types and quantities of industrial wastewater with refractory organic pollutants are increasing, and the harm to the ecological environment is becoming increasingly serious, especially in industries such as chemical industry, medicine, pesticide, papermaking and metallurgy; due to economic and Due to technical reasons, traditional wastewater treatment technologies such as physical, chemical and biochemical methods can no longer meet the increasingly high environmental protection requirements. It has become a major issue in the chemical industry to explore efficient and economical methods to treat highly toxic and biodegradabl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/72C02F1/78C02F1/461C02F9/06
CPCC02F1/4672C02F1/5245C02F1/66C02F1/72C02F1/722C02F1/725C02F1/78C02F9/00C02F2305/026
Inventor 吴晓奕卑康宁
Owner WUXI ZHONGTIAN SOLID WASTE DISPOSAL CO LTD
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