Method for treating odorous gas by utilizing solution of hexavalent ferric salt

A solution treatment, high iron salt technology, applied in separation methods, chemical instruments and methods, dispersed particle separation, etc., can solve the problems of long removal of odor, generation of treatment time, etc., and achieve good stability, long-lasting strong oxidation, high efficiency and stability Effect of removing bad smell gas

Inactive Publication Date: 2011-05-25
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the use of the above-mentioned oxidants to remove malodors requires a long treatment time and produces toxic by-products during the process. Therefore, it is necessary to explore an oxidation technology for removing malodorous gases that has stronger oxidation capabilities and does not produce toxic by-products.

Method used

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  • Method for treating odorous gas by utilizing solution of hexavalent ferric salt

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Preparation of hexavalent ferric salt solution

[0023] The hexavalent ferric salt was prepared as follows: 53.4 g KMnO 4 Added to 330 ml of 37% hydrochloric acid by volume to generate Cl 2 . Cl 2 Pass into the KOH solution that has been prepared and cooled in advance, and stir for more than two hours. Another 180 g of KOH was added to the solution, and the solution was cooled. The precipitated KCl was removed from the solution by filtration with GF / C filter paper, leaving a concentrated, strongly basic KClO yellow filtrate. 75 g of powdered Fe(NO 3 ) 3 9H 2 O was slowly added to the KClO filtrate with rapid stirring. Then 60 g KOH was added to the above solution, and the mixture was stirred for 20 minutes. The solution was allowed to stand for 40 minutes, and the resulting deep purple slurry was filtered through a glass filter, and the filtrate was discarded. Wash the precipitate with pre-cooled 1 mol / L KOH solution. The rinsed filtrate was collected and add...

Embodiment 2

[0026] Hexavalent ferric salt oxidation technology to treat H 2 S malodorous gas

[0027] The series of experiments were performed at H 2 The concentration of S gas is 50 ppm / v, and the Fe(VI) solution prepared by using different pH buffer solutions is sprayed out from the nozzle at the upper end of the purification equipment. The molar concentration range of ferrate was between 0.08-1.39 mM. At pH 7.0, when ferrate and H 2 The molar ratio of S ([Fe(VI)] / [H 2 S]) are 0.58, 0.83, 1.66, 2.49, 2.77, 3.00 and 4.15 respectively, H 2 S is converted to SO 4 2- The efficiencies were 26.4%, 35.0%, 68.6%, 94.7%, 98.0%, 99.3% and 100%, respectively. and OH is released during the reaction - ions, the pH of the mixed solution increased from the initial 8.4 to 9.5. At pH 9.0, when [Fe(VI)] / [H 2When the molar ratio of S] is 0.56, 0.84, 1.10, 1.68, 2.20, 2.52, 2.80 and 4.20, the H 2 S is converted to SO 4 2- The efficiencies were 37.9%, 44.5%, 58.5%, 66.9%, 87.2%, 96.2%, 97.9, an...

Embodiment 3

[0031] Treatment of CH by Hexavalent Ferric Salt Oxidation Technology 3 SH malodorous gas

[0032] The series of experiments were performed at CH 3 The concentration of SH gas is 50 ppm / v, and the Fe(VI) solution prepared by buffer solution is sprayed from the upper nozzle of the purification equipment. The molar concentration of ferrate ranges from 0.35 mM to 1.5 mM. At pH 9.0, when ferrate and CH 3 The molar ratio of SH ([Fe(VI)] / [CH 3 SH]) are 2.3, 3.0, 4.0, 4.6, 5.0, 6.0 and 8.0 respectively, the CH 3 The SH removal efficiencies were 14.5%, 34.3%, 60.3%, 95.0%, 97.3%, 99.0% and 100%, respectively. OH is released during the reaction - ions, the pH of the mixed solution increased from the initial 8.14 to 9.44.

[0033] Ferrate and CH 3 The stoichiometric equation for SH is as follows:

[0034] 14HFeO 4 - + 3CH 3 SH+9H 2 O → 14Fe(OH) 3 + 3SO 4 2- + 3CO 3 2- + 2OH - (II)

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Abstract

The invention belongs to the fields of treating odorous pollutants through chemical oxidation technology, and relates to a method for treating odorous gas by utilizing solution of hexavalent ferric salt. Odor is harmful to human respiratory, circulatory, digestive, endocrine and nervous systems, and odor pollution has become one of numerous environmental pollution problems to be solved; and in the method, the solution of hexavalent ferric salt and odorous substances are subjected to a chemical oxidation reaction, so that active groups in the odorous substances are changed. Due to oxidation of the hexavalent ferric salt on hydrogen sulfide, ammonia, methyl mercaptan and other odorous substances in the odorous gas, the active groups in the odorous waste gas are oxidized into non-toxic and harmless sulfate and other products. Therefore, the aim of purifying the odorous waste gas is fulfilled, and the odor of the odorous waste gas can be effectively removed.

Description

technical field [0001] The invention belongs to the field of chemical oxidation technology for treating odorous pollutants, and relates to a method for treating odorous gas with a hexavalent ferric salt solution. Background technique [0002] With the enhancement of people's awareness of environmental protection, the requirements for environmental quality are getting higher and higher, and they are more sensitive to environmental pollution caused by stench. The substances that produce foul smell not only can make people feel disgusted, but also many foul smelling substances are extremely harmful to the human body. The sources of stench are very extensive, such as sewage treatment plants, garbage transfer stations, landfills, and even food processing plants, etc. will produce different kinds of stench and toxic gases. Odor is harmful to human respiration, circulation, digestion, endocrine and nervous system, and odor pollution has become one of many environmental pollution p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/78B01D53/48B01D53/54
Inventor 何春夏德华李适宇苏敏华朱林飞
Owner SUN YAT SEN UNIV
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