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Method for regulating nitrous oxide recovery based on NO denitrification process

A nitrous oxide and process regulation technology, applied in nitrous oxide, nitrous oxide capture, chemical instruments and methods, etc., can solve the problems of high cost of N2O collection and reuse, low conversion and enrichment efficiency, etc. , to achieve the effect of reducing cost input, cutting costs and high production rate

Pending Publication Date: 2020-05-19
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a method for regulating nitrous oxide recovery based on the NO denitrification process in order to overcome the above-mentioned defects in the prior art. 2 O conversion and enrichment efficiency is low, N 2 Technical problems of high cost of collection and reuse of O

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Utilize the same amount of FeSO 4 and Na 2 EDTA dissolves and reacts in an anaerobic environment to generate Fe(II)EDTA, and absorbs gaseous NO to complex into liquid Fe(II)EDTA-NO through the scrubber;

[0033] Using NaNO 3 Acclimate as nitrogen source and sodium acetate as carbon source, add 1200mg NaNO per liter of denitrifying microbial mixture 3 , add 1000mg of sodium acetate per liter of denitrifying microbial mixture. The domesticated denitrifying microorganisms were washed three times with phosphate buffer, and inoculated into a reactor with an effective volume of 0.5L. Add 10 mM Fe(II) EDTA-NO solution and sodium acetate stock solution, adjust the COD / N value to 1.14, and adjust the pH to 7.2±0.2. Use argon to continuously purge for 5 minutes to keep no nitrogen and oxygen residues in the reactor, and then seal the reactor and place it in a constant temperature incubator at 35-37°C for reaction. During the period, the headspace gas composition of the react...

Embodiment 2

[0035] Utilize the same amount of FeSO 4 and Na 2 EDTA dissolves and reacts in an anaerobic environment to generate Fe(II)EDTA, and absorbs gaseous NO to complex into liquid Fe(II)EDTA-NO through the scrubber;

[0036] Using NaNO 3 Acclimate as nitrogen source and sodium acetate as carbon source, add 1214mg NaNO per liter of denitrifying microbial mixture 3 , Add 1025 mg of sodium acetate per liter of denitrifying microbial mixture. The domesticated denitrifying microorganisms were washed three times with phosphate buffer, and inoculated into a reactor with an effective volume of 0.5L. Add 10 mM Fe(II) EDTA-NO solution and sodium acetate stock solution, adjust the COD / N value to 0.57, and adjust the pH to 7.2±0.2. Use argon to continuously purge for 5 minutes to keep no nitrogen and oxygen residues in the reactor, and then seal the reactor and place it in a constant temperature incubator at 35-37°C for reaction. During the period, the headspace gas composition of the reac...

Embodiment 3

[0038] Utilize the same amount of FeSO 4 and Na 2 EDTA dissolves and reacts in an anaerobic environment to generate Fe(II)EDTA, and absorbs gaseous NO to complex into liquid Fe(II)EDTA-NO through the scrubber;

[0039] Using NaNO 3 Acclimate as nitrogen source and sodium acetate as carbon source, add 1230mg NaNO per liter of denitrifying microbial mixture 3 , add 1050mg sodium acetate per liter of denitrifying microbial mixture. The domesticated denitrifying microorganisms were washed three times with phosphate buffer, and inoculated into a reactor with an effective volume of 0.5L. Add 10 mM Fe(II) EDTA-NO solution and sodium acetate stock solution, adjust the COD / N value to 0.35, and adjust the pH to 7.2±0.2. Use argon to continuously purge for 5 minutes to keep no nitrogen and oxygen residues in the reactor, and then seal the reactor and place it in a constant temperature incubator at 35-37°C for reaction. During the period, the headspace gas composition of the reactor ...

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Abstract

The invention relates to a method for regulating nitrous oxide recovery based on a NO denitrification process. The gaseous pollutant NO is immobilized into a solution to form Fe (II) EDTA-NO in a complex state as a denitrification substrate, the yield of N2O in the reaction process is controlled by adjusting the addition amount of a carbon source, enrichment is achieved, and energy recovery in thedenitrification process is facilitated. Compared with the prior art, the method is simple in process, low in energy consumption and free of by-products, the conversion rate of Fe (II) EDTA-NO to N2Ois high and can reach about 0.45, and the obtained N2O gas can be used as an oxidizing agent, a combustion improver and the like.

Description

technical field [0001] The invention belongs to the technical field of environmental engineering denitrification treatment, and in particular relates to a NO denitrification process-based regulation of N 2 O capacity recovery method. Background technique [0002] NO is one of the main gaseous pollutants, which poses a great threat to the atmospheric environment and human health. At present, chemical methods such as selective catalytic reduction (SCR), selective non-catalytic reduction (SNCR), pulsed corona plasma and pressure swing adsorption are commonly used in actual production to remove NO from gas. However, these chemical methods have certain defects, including high cost and secondary pollution. [0003] Complex absorption-biological reduction removal technology (BioDeNOx) combines chemical absorption and biological denitrification technology. It is considered as a new technology for removing NO in exhaust gas. It has the advantages of low investment, low cost, short ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C12P3/00C01B21/22B01D53/56B01D53/78
CPCC12P3/00C01B21/22B01D53/56B01D53/78B01D2251/902B01D2251/95Y02C20/10Y02P20/59Y02P20/151
Inventor 倪丙杰王丽坤孙婧徐秋翔
Owner TONGJI UNIV
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