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Clean flue gas bio-desulfurization and denitrification method and apparatus thereof

A biological desulfurization and flue gas technology, applied in the field of environmental biology, can solve the problems of difficult treatment, increase the difficulty and cost of wastewater treatment, and the inability to realize sulfur recovery, and achieve the effect of high purity

Active Publication Date: 2016-05-11
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are two significant problems in the above-mentioned flue gas biological desulfurization process: 1. High sulfate wastewater is one of the most difficult wastewater to treat and is a research hotspot in the field of wastewater treatment. The sulfide produced by sulfate reduction has a strong effect on anaerobic digestion. Inhibition, the sulfur oxides in the flue gas are absorbed into the wastewater, which increases the difficulty and cost of wastewater treatment
Therefore, existing flue gas biological desulfurization methods cannot achieve cost-effective sulfur recovery

Method used

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  • Clean flue gas bio-desulfurization and denitrification method and apparatus thereof
  • Clean flue gas bio-desulfurization and denitrification method and apparatus thereof
  • Clean flue gas bio-desulfurization and denitrification method and apparatus thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0067] Embodiment 1 Clean flue gas biological desulfurization and denitrification process flow

[0068] Such as figure 1 As shown, the clean flue gas biological desulfurization and denitrification integrated process of the present invention is mainly composed of flue gas absorption, sulfide stripping / hydrogen sulfide absorption, facultative denitrification, anaerobic sulfate reduction, anaerobic methanogenesis, micro-oxygen sulfur oxidation It is composed of elemental sulfur production, sulfur recovery and aerobic aeration tank. The specific process is as follows:

[0069] 1) Take 0.2~0.5M NaHCO 3 As the absorption liquid, the sulfur oxides and nitrogen oxides in the flue gas to be treated after dedusting and cooling are absorbed in the absorption tower 1, and the pH value of the absorption rich liquid is reduced to 4.0-5.0 by controlling the gas-liquid ratio.

[0070] 2) Absorb the rich liquid and anaerobic sulfate reduction reactor 4 backflow and mix in the mixing tank 2 ...

Embodiment 2

[0082] Embodiment 2 The treatment effect of the present invention on simulated flue gas with different sulfur oxide concentrations

[0083] Simulated flue gas: SO x Concentration (as SO 2 Total) is 500, 1000, 2000, 3000, 4000mg / Nm 3 (Stage1~5).

[0084] Gas flow rate: 1.0Nm3 / h.

[0085] Absorption of poor solution: with 0.2M NaHCO 3 The pH of the solution was adjusted to 7.5.

[0086] Hydrogen sulfide absorbent: Na 2 CO 3 solution.

[0087] Supplementary carbon source: The control system automatically adds ethanol according to the pH difference between the absorbed poor solution and the rich solution.

[0088] What kind of strain is the biological sulfur oxidation reactor? The denitrifying bacteria were taken from the denitrification sludge of the municipal sewage treatment plant and inoculated in the facultative denitrification reactor; the anaerobic sludge of the municipal sewage treatment plant was inoculated in the anaerobic sulfate reduction reactor and the meth...

Embodiment 3

[0093] Example 3 The treatment effect of the present invention on simulated flue gas with different ratios of sulfur oxides and nitrogen oxides

[0094] Simulated flue gas: SO x Concentration (as SO 2 Total) 2000mg / Nm 3 , NO x Concentration (as NO 2 Total) 50, 100, 200, 400mg / Nm 3 (Stage1~4).

[0095] Other processing conditions are identical with embodiment 2.

[0096] The experimental results are attached image 3 shown. Simulated flue gas treated SO x Concentration down to 3 , SO x Removal rate>99%. due to NO x Including insoluble NO in water, NO x The removal rate is as low as 50-70%. After flue gas is treated with biological desulfurization and denitrification, NO x Concentration down to 200mg / Nm 3 Hereinafter, the removal rate of nitrate nitrogen generated after nitrogen oxides are absorbed is 100%. Indexes such as sulfur recovery rate, sulfur purity, and effluent COD are similar to those in Example 2, being >90%, >98%, and 3 .

[0097] This example show...

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Abstract

The invention belongs to the biotechnical field of environment, and concretely relates to a clean flue gas bio-desulfurization and denitrification method and an apparatus thereof. Four bio-reactions comprising denitrification, sulfate reduction, methane production and sulfur oxidation elemental sulfur production and sulfide stripping / hydrogen sulfide absorption combination are adopted to collect oxysulfides in flue gas and directly convert the oxysulfides into highly pure sulfur and convert nitrogen oxide into nitrogen; and an absorption liquid can be regenerated, so the consumption of alkalis and water is saved. Solid wastes and wastewater are not generated in the treatment process, and secondary pollution is avoided.

Description

technical field [0001] The invention belongs to the field of environmental biology technology, in particular, the invention relates to a clean flue gas biological desulfurization and denitrification method and device. Background technique [0002] The flue gas produced by the combustion of coal and other fuels contains a large amount of sulfur oxides and nitrogen oxides, which are the main pollutants in the atmosphere. The country has listed flue gas sulfur oxides and nitrogen oxides as the main monitoring indicators for air pollution control. At present, people have proposed a variety of flue gas desulfurization and denitrification methods, and some methods have achieved industrial application. However, these methods still have serious secondary pollution problems, and produce a large amount of difficult-to-treat waste liquid and waste solids, such as high-sulfate wastewater and calcium sulfate solids. In actual production, due to the high cost of treatment or the inabili...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/78B01D53/60B01D53/52C01B17/05C02F3/30
CPCY02A50/20Y02W10/10
Inventor 宋子煜邢建民
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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