Method for reducing Fe(III)EDTA in solution and uses thereof

A solution and mixed solution technology, applied in the field of environmental pollution control, can solve the problems of reducing NO absorption rate, low regeneration rate, loss of complexation ability, etc., and achieve the effects of avoiding secondary pollution, increasing reduction rate, and saving raw materials

Inactive Publication Date: 2009-10-14
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, using Fe(II)EDTA as an absorber to complex absorb NO x Have following shortcoming simultaneously (Sada E, " Ind.Eng.Chem.Res ", 1987,26,1468-1472; Zang V, " Inorg.Chem. ", 1990,29 (9), 1705-1711):( 1) Absorbed NO and dissolved SO 2 react to become N 2 O, N 2 and some other N-S compounds, however, these by-product N-S compounds are difficult to separate from the solution due to their high water solubility
(2) Since the flue gas generally contains 3% to 8% of O 2 , Fe(II) in such absorbents is easily absorbed by O 2 It is oxidized to Fe(III) and loses its ability to complex NO, thereby reducing the absorption rate of NO
Na 2 S 2 o 4 , Vitamin C, SO 3 2- 、HSO 3 - , Glyoxal and other reducing agents can regenerate the oxidized absorbent, but the generation of high cost, low regeneration rate or intractable by-products; Tsai et al. studied the use of electrochemical methods to reduce Fe(III)EDTA to Fe( II) Feasibility of EDTA, NO removal rate can be stabilized at 70% to 80% (Tsai SS, "Environ.Prog.", 1989, 8, 126-129) in the continuous operation process, but this method is applied in industry Production is uneconomical because a high amount of electrical energy is required to reduce other components such as dissolved oxygen that have a lower reduction potential than Fe(III) present in the solution; resulting in a single Fe(II)EDTA complex absorption method Cannot be used in industry

Method used

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  • Method for reducing Fe(III)EDTA in solution and uses thereof
  • Method for reducing Fe(III)EDTA in solution and uses thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] 3mmol FeCl 3 4H 2 O, 3mmol Na 2 h 2 EDTA was dissolved in water to make Fe(III)EDTA solution, then 30mmol glucose and basal medium concentrate were dissolved in the above solution to make 1L mixed solution, the pH value of the mixed solution was adjusted to 6.5, and the concentration of Fe(III)EDTA in the solution The concentration of the basal medium is 3mmol / L, the concentration of the basal medium is consistent with the concentration of the basal medium of the enrichment culture, and then the mixed solution is poured into the reactor; at a temperature of 50°C, the physical electrode with the iron-reducing bacteria film Put it into the mixed solution and electrify, where the current density is 0.03mA / cm 2 , after reduction reaction 3 hours, the Fe(III)EDTA in the reactor is 0.2mmol / L.

Embodiment 2

[0032] 5mmol Fe 2 (SO 4 ) 3 , 10mmolNa 2 h 2 EDTA is dissolved in water and makes Fe(III)EDTA solution, then 30mmol ethanol and basal medium concentrate are dissolved in above-mentioned solution to make 1L mixed solution, the pH value of adjusting mixed solution is 5, the Fe(III)EDTA in the solution The concentration of the basal medium is 10mmol / L, the concentration of the basal medium is the same as that of the enriched culture, and then the mixed solution is poured into the reactor; at a temperature of 30°C, the electrode with the iron-reducing bacteria film is placed Into the mixed solution and electrified, where the current density is 0.01mA / cm 2 , after reduction reaction 6 hours, the Fe(III)EDTA in the reactor is 3.4mmol / L.

Embodiment 3

[0034] 10mmol FeCl 3 4H 2 O, 10mmol Na 3 HEDTA is dissolved in water, then 30mmol sodium acetate and basal medium concentrate are dissolved in above-mentioned solution and make 1L mixed solution, the pH value of adjusting mixed solution is 6.5, the Fe(III)EDTA concentration in the solution is 10mmol / L, basic The concentration of the medium is consistent with the concentration of the basal medium for enrichment culture, and then the mixed solution is poured into the reactor; at a reaction temperature of 60°C, the electrode with the iron-reducing bacteria film is placed in the mixed solution and energized , where the current density is 0.59mA / cm 2 , after reducing for 6 hours, the Fe(III)EDTA in the reactor was 2.9mmol / L

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Abstract

The invention discloses a method for reducing Fe(III)EDTA in a solution and its application. A physical electrode made of a porous carbon material is subjected to iron-reducing bacteria film formation and domestication to obtain an electrode with iron-reducing bacteria film; Dissolving the external electron donor, carbon source and basal medium in a solution containing Fe(III) EDTA to prepare a mixed solution, then placing an electrode with an iron-reducing bacterial membrane into the mixed solution and electrifying, the method of the present invention can be applied Fe(III)EDTA in the reduction of nitrogen oxide-containing flue gas absorption liquid. The method of the invention greatly improves the reduction rate of Fe(III)EDTA, has simple operation, stable operation and small floor space.

Description

technical field [0001] The invention relates to the field of environmental pollution control, in particular to a method for reducing Fe(III)EDTA in a solution and an application thereof. Background technique [0002] Nitrogen oxides (NO x ) emission is one of the main causes of a series of serious air pollution problems such as acid rain and photochemical smog. With the emphasis on nitrogen oxide pollution and the promulgation and implementation of relevant laws and regulations in recent years, the control of nitrogen oxide emissions in my country will become increasingly strict. NO in coal flue gas x , more than 95% are NO, NO 2 Therefore, the essence of flue gas denitrification is the removal of NO. Since NO is basically insoluble in water, in common wet desulfurization devices, NO can not be removed at the same time as desulfurization. If a chemical additive can be found and added to the existing wet desulfurization process, it will be a very economical and ideal met...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/14C02F1/70C02F3/34C02F1/461
Inventor 李伟糜徐红张士汉邵科
Owner ZHEJIANG UNIV
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