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Application of sodium azide in degradation of organic matters and method for treating organic wastewater by ozone

A technology of organic wastewater and sodium azide, which is applied in special compound water treatment, chemical instruments and methods, oxidized water/sewage treatment, etc., can solve the problems of economic and convenience limitations, metal ion pollution, etc., and achieve improved reliability Biochemical properties, the effect of simplifying the operation process

Inactive Publication Date: 2021-08-24
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional homogeneous ozone catalytic method usually needs to add metal ions, or be triggered by UV, electricity, ultrasonic and other methods. The former will introduce metal ions to cause pollution, while the latter needs to input a large amount of energy into the system. Other large equipment, so the economy and convenience are limited

Method used

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  • Application of sodium azide in degradation of organic matters and method for treating organic wastewater by ozone
  • Application of sodium azide in degradation of organic matters and method for treating organic wastewater by ozone
  • Application of sodium azide in degradation of organic matters and method for treating organic wastewater by ozone

Examples

Experimental program
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Effect test

Embodiment 1

[0029] The organic pollutant in organic wastewater is atrazine. The initial concentration of atrazine is 1mg / L, the reaction temperature is 10°C, the reaction pH value is 3, NaN 3 The dosage of ozone is 0.3mg / L, the dosage of ozone is 3mg / L, NaN 3 The dosing method is one-time dosing, and the reaction time is 30 minutes. After testing, the removal rate of atrazine was 100%.

[0030] The degradation effect of organic matter atrazine in embodiment 1 sees as figure 2 As shown, among them, the dotted line indicates that there is no NaN 3 Degradation curve of atrazine, □ dotted line indicates NaN 3 Degradation curve of atrazine in the presence. From figure 2 It can be seen that when atrazine was treated for 10 minutes, no NaN was added 3 The remaining rate of atrazine in the solution was about 50% and NaN was added 3 The remaining rate of atrazine in the solution is about 10%. As reaction time increases without NaN addition 3 The remaining rate of atrazine in the soluti...

Embodiment 2

[0032] The organic pollutant in organic wastewater is atrazine. The initial concentration of atrazine is 10mg / L, the reaction temperature is 20°C, the reaction pH value is 3, NaN 3 The dosage is 5mg / L, the dosage of ozone is 30mg / L, NaN 3 The dosing method is continuous dosing for 10 minutes, and the reaction time is 60 minutes. After testing, the removal rate of atrazine was 95%.

Embodiment 3

[0034] The organic pollutant in organic wastewater is atrazine. The initial concentration of atrazine is 100mg / L, the reaction temperature is 15°C, the reaction pH value is 7, NaN 3 The dosage of ozone is 100mg / L, the dosage of ozone is 200mg / L, NaN 3 The dosing method is continuous dosing for 60 minutes, and the reaction time is 60 minutes. After testing, the removal rate of atrazine was 100%.

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Abstract

The invention discloses an application of sodium azide in degradation of organic matters and a method for treating organic wastewater by ozone. Organic matters in part of wastewater have stable structures and are difficult to degrade in a conventional oxidation process, and the organic matters generally have relatively strong biotoxicity, so that the biodegradability is relatively poor. According to the method, sodium azide is added in the process of oxidizing degradation-resistant organic matters by ozone, and electron-poor degradation-resistant organic matters are oxidized by utilizing azide free radicals (N3.) and hydroxyl free radicals (.OH) generated by reaction of the ozone and the sodium azide, so that ring-carrying degradation-resistant organic matters are subjected to ring opening, then the deep degradation of the degradation-resistant organic matters is realized, and the biodegradability of organic wastewater is improved. The azide free radicals generated in the reaction can be converted into nitrite and nitrate or directly added to the organic matters after reacting with the organic matters, a nitrogen source can be provided for subsequent biological treatment, and the subsequent biological treatment operation process is simplified.

Description

technical field [0001] The invention belongs to the technical field of organic wastewater treatment, and in particular relates to the application of sodium azide in ozone oxidation treatment of organic wastewater. Background technique [0002] Some pesticides (such as atrazine, etc.) and odorant substances (such as 2,6-dimethylpyrazine, etc.) in water have very stable structures, which are difficult to degrade in conventional oxidation processes, and these substances are usually It has strong biological toxicity, so its biodegradability is poor, and it is difficult to remove organic pollutants such as atrazine and 2,6-dimethylpyrazine in water by biodegradation methods. [0003] Ozone oxidation is a commonly used method in water pollution control engineering. In drinking water treatment, sewage treatment and environmental water purification technology, ozone is usually used as a pretreatment or advanced treatment process. However, ozone oxidation usually only oxidizes elect...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/72C02F1/78C02F101/30C02F101/32C02F101/36C02F101/38
CPCC02F1/725C02F1/78C02F2305/023C02F2101/30C02F2101/32C02F2101/38C02F2101/306C02F2101/36
Inventor 杨帆汪达何银宁杨喆胡航恺傅思琪宋爽
Owner ZHEJIANG UNIV OF TECH
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