Biological method for simultaneously removing SO2,NOX,heavy metal and granule from gas

A technology for heavy metals and particulates, applied in the fields of denitrification, simultaneous desulfurization of exhaust gas, heavy metals and particulates, can solve the problems of high cost of pollutant treatment and simultaneous removal, and achieve the effect of improving the denitrification rate and realizing comprehensive treatment

Inactive Publication Date: 2006-12-20
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

[0005] The purpose of the invention is to solve the problem that the existing exhaust gas purification technology cannot remove the four kinds of pollutants (SO 2 , NO x , heavy metals and particles) simultaneous removal, high cost of pollutant treatment

Method used

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  • Biological method for simultaneously removing SO2,NOX,heavy metal and granule from gas
  • Biological method for simultaneously removing SO2,NOX,heavy metal and granule from gas
  • Biological method for simultaneously removing SO2,NOX,heavy metal and granule from gas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] 1) Set the temperature to 120°C, containing SO 2 (5000mg / m 3 ), NO x (500mg / m 3 ), Hg (20mg / m 3 ), dust (10000mg / m 3 ) of flue gas at 10m 3 The rate of / h is passed into the packed column, containing 10 9 cells / ml nitrifying bacteria, 10 8 cells / ml The biological absorption solution of sulfur oxidizing bacteria is sprayed from the top of the tower at a rate of 50l / h, and the gas discharged from the top of the tower contains SO 2 3 , NO x 3 , Hg3 , Dust3 ;

[0039] 2) The absorption liquid is passed into an anaerobic reactor containing SRB bacteria and denitrifying bacteria. After 30 hours of treatment, the S in the liquid 4+ +S 6+ Concentration3+ +N 5+ Concentration <40mg / L, Hg concentration <0.1mg / L;

[0040] 3) The effluent from the anaerobic reactor enters the aerobic reactor, and after 2 hours of treatment, the effluent S 2- Less than 2mg / L, the content of elemental sulfur in solid particles in water is about 80%.

Embodiment 2

[0042] 1) Set the temperature at 20°C, containing SO 2 (1000mg / m 3 ), NO x (500mg / m 3 ), Zn (50mg / m 3 ) simulated exhaust gas at 10m 3 The rate of / h is passed into the packed column, containing 10 10 cells / ml nitrifying bacteria, 10 6 cells / ml The biological absorption solution of sulfur oxidizing bacteria is sprayed from the top of the tower at a rate of 5l / h, and the gas discharged from the top of the tower contains SO 2 3 , NO x 3 , Zn3 ;

[0043] 2) The absorption liquid is passed into an anaerobic reactor containing SRB bacteria and denitrifying bacteria. After 5 hours of treatment, the S in the liquid 4+ +S 6+ Concentration3+ +N 5+ Concentration < 20mg / L, Zn concentration < 0.05mg / L;

[0044] 3) The effluent from the anaerobic reactor enters the aerobic reactor, and after 0.4h treatment, the effluent S 2- Less than 2mg / L, the content of elemental sulfur in solid particles in water is about 70%.

Embodiment 3

[0046] 1) Set the temperature to 150°C, containing SO 2 (3000mg / m 3 ), NO x (1000mg / m 3 ), Hg (50mg / m 3 ), dust (5000mg / m 3 ) simulated exhaust gas at 10m 3 The rate of / h is passed into the packed column, containing 10 11 cells / ml nitrifying bacteria, 10 7 cells / ml The biological absorption solution of sulfur oxidizing bacteria is sprayed from the top of the tower at a rate of 20l / h, and the gas discharged from the top of the tower contains SO 2 3 , NO x 3 , Hg3 , Dust3 ;

[0047] 2) The absorption liquid is passed into an anaerobic reactor containing SRB bacteria and denitrifying bacteria. After 20 hours of treatment, the S in the liquid 4+ +S 6+ Concentration3+ +N 5+ Concentration <50mg / L, Hg concentration <0.05mg / L;

[0048] 3) The effluent from the anaerobic reactor enters the aerobic reactor, and after 1.0 hours of treatment, the effluent S 2- Less than 3mg / L, the content of elemental sulfur in solid particles in water is about 75%.

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Abstract

The invention relates to a method for removing SO2, NOx, heavy metal and particle of waste gas, wherein it comprises: using the common-temperature absorb liquid of nitrifying bacteria and sulfur oxidizing bacteria, in the biological absorb tower A, to be reacted with the waste gas, to transfer SO2, NOx, heavy metal and particle to liquid phase; then feeding the liquid and electric carrier to the anaerobic reactor B; under the condition that the pH value is 6.0-9.5, the temperature is 45-65Deg. C and the CODGr/S is 2-10, reducing sulfur into passive-two sulfur, reducing nitrogen into nitrogen gas, and transforming the heavy metal into sulfide deposition; then feeding the reacted water to the aerobic reactor C; under the condition that the pH value is 6.0-9.5, the temperature is 20-40Deg. C and the dissolved oxygen is 1.5-5mg/L, oxygenizing the sulfur selectively into single sulfur; the liquid separated from single sulfur is refluxed as the absorb liquid; for confirming there is enough nitrifying bacteria in the absorb liquid, keeping adding nitrifying bacteria.

Description

field of invention [0001] The invention relates to a method for purifying exhaust gas, in particular to a method for simultaneously desulfurizing, denitrifying, removing heavy metals and removing particulate matter through the biological method of exhaust gas. Background technique [0002] Coal and petroleum are important strategic resources of our country, and more than 90% of domestic energy is related to them. During chemical reactions (such as combustion), SO 2 , NO x , heavy metals and particulate matter are common main components of reactor (including boiler) tail gas, which seriously pollute the atmospheric environment on which we live. According to the World Health Organization's monitoring of 60 countries for 10-15 years, my country has 8 of the 10 most polluted cities in the world. Of the 340 cities monitored in my country in 2003, only 142 cities reached the second-level standard of the national ambient air quality (reaching the livin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/84B01D53/60B01D53/64
CPCY02A50/20
Inventor 曹宏斌张懿
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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