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Method for synchronously removing dissolved methane and NOx

A soluble and methane technology, applied in chemical instruments and methods, methods based on microorganisms, methods using microorganisms, etc., can solve the problems of glucose consumption and low utilization rate of carbon resources, and achieve less excess sludge and convenient operation and operation. , the effect of simple process

Inactive Publication Date: 2020-07-10
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Based on the problems of large consumption of glucose or sulfide and low utilization rate of carbon resources in the existing bioreduction coupled chemical absorption flue gas nitrogen oxide technology, the present invention proposes a high-efficiency flue gas NOx removal method, which can be used as CH 4 As an electron donor, it can complex and absorb NOx into Fe(II)EDTA-NO and NO 2 - converted to N 2 , while CH 4 converted to CO 2 , with good treatment effect, less residual sludge, simple operation and no N 2 The accumulation of intermediate metabolites such as O can realize the advantages of using waste to treat waste, etc.

Method used

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  • Method for synchronously removing dissolved methane and NOx
  • Method for synchronously removing dissolved methane and NOx
  • Method for synchronously removing dissolved methane and NOx

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A kind of efficient flue gas NOx removal method, comprises the following steps:

[0031] (1) The flue gas passes through the Fe(II)EDTA adsorbent with a concentration of 10mmol / L to absorb and convert NOx in the flue gas into Fe(II)EDTA-NO and NO 2 - ;

[0032] (2) Using the MBfR reactor, the mixture of river sediment, domesticated DAMO microorganisms, and sludge from the secondary sedimentation tank of the municipal sewage plant was used as the inoculum, and Fe(II)EDTA-NO and NO 2 - The mixed solution is influent water, which will contain CH 4 and CO 2 The mixed gas is passed into the membrane filament of the MBfR reactor, and the nutrient solution is added at the same time, and the Fe(II)EDTA-NO and NO 2 - When the removal rate reaches more than 90%, the removal of NOx in the methane-based flue gas is completed.

[0033] The temperature of the MBfR reactor is 20° C., the pH value is 6, the HRT is 24 hours, and the dissolved oxygen is 0.2 mg / L.

[0034] Fe(II)E...

Embodiment 2

[0041] The difference between this example and Example 1 is that in step 2, the temperature of the reactor is controlled at 25°C, the pH value is 7.0, and the HRT is 12h; at the same time, the concentration of Fe(II)EDTA-NO is calculated as N, and NO 2 - The concentration is in N, and the concentration ratio of the two is in the range of 5:1, and the concentration of the two is 100mg / L and 20mg / L respectively; in step (2), the paddy field soil with a mass ratio of 1:1 is respectively used in the DAMO microbial domestication condition And municipal sewage plant sludge is inoculation sludge, and inoculum amount is 15%; Be that the stock solution of 150mgN / L nitrate and 150mgN / L ammonia nitrogen stock solution are pulse water inflow with concentration, cultivate continuously 250 days; In step (2) The dissolved oxygen in the reactor is 0.15 mg / L; other steps and parameters are the same as in Example 1.

Embodiment 3

[0043] The difference between this example and Example 1 is that in step 2, the temperature of the reactor is controlled to be 30°C, the pH value is 7.2, and the HRT is 18h; at the same time, the concentration of Fe(II)EDTA-NO is calculated as N, and NO 2 - The concentration is in N, and the concentration ratio of the two is in the range of 7:1, and the concentration of the two is 210mg / L and 30mg / L respectively; in the step (2) DAMO microbial domestication conditions, the paddy field soil and The municipal sewage plant sludge is inoculated sludge, and the inoculum amount is 15%; the stock solution of 100mgN / L nitrate and the 100mgN / L ammonia nitrogen stock solution are pulsed water inflow with a concentration, and are continuously cultivated for 260 days; reaction in step (2) The dissolved oxygen in the container is 0.1 mg / L; other steps and parameters are the same as in Example 1.

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Abstract

A method for synchronously removing dissolved methane and NOx comprises the following steps: (1) flue gas passes through a Fe (II) EDTA adsorbent, NOx in the flue gas is absorbed and converted into Fe(II) EDTA-NO and NO2<-> mixed liquid; and (2) an MBfR reactor is adopted, a mixture of river sediment, domesticated DAMO microorganisms and secondary sedimentation tank sludge of a municipal sewage plant is used as an inoculum, the Fe (II) EDTA-NO and NO2<-> mixed liquid is used as inlet water, a mixed gas containing CH4 and CO2 is introduced into membrane filaments of the MBfR reactor, a nutrient solution is addded at the same time, and removal of NOx in the flue gas of a methane matrix is completed when the removal rate of Fe (II) EDTA-NO and NO2<-> reaches 90% or above. The method has theadvantages of good treatment effect, less residual sludge, simple operation, no accumulation of N2O and other intermediate metabolites, realization of treatment of wastes with processes of wastes against one another, and the like.

Description

technical field [0001] The invention belongs to the technical field of flue gas treatment, and relates to a 4 A method for removing NOx from flue gas. Background technique [0002] The combustion products of fossil fuels are one of the important sources of atmospheric environmental pollution, among which nitrogen oxides (NOx) include 90% NO, 5% to 10% NO 2 , easily lead to the formation of smog and acid rain. The source of NOx emissions is mainly from industrial emissions, and among the nitrogen oxides emitted by industry, the power and heat production industry is the most important source of pollution emissions. Secondly, the amount of nitrogen oxides emitted by urban life from mobile sources such as vehicle exhaust cannot be ignored. Existing flue gas NOx removal technologies mainly include low-carbon combustion technology and non-selective catalytic reduction technology. The catalytic reduction method is currently the most researched and most widely used pollutant NO....

Claims

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Application Information

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IPC IPC(8): B01D53/56B01D53/72B01D53/84C12N1/36C12N1/20C12R1/01C12R1/38
CPCB01D53/56B01D53/84C12N1/36C12N1/20B01D53/18B01D53/1493B01D53/72B01D2258/0283B01D2257/7025Y02E50/30Y02A50/20Y02C20/10Y02C20/20Y02P20/59
Inventor 刘春爽于海彤董琪王永兴国亚东刘芳赵朝成
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)