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Method for controlling toxic biogas sol in gas-solid phase bioreactor tail gas

A bioreactor and bioaerosol technology, applied in the field of environmental management, achieves significant social and economic benefits, improves air quality, and reduces concentrations

Active Publication Date: 2008-12-24
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

During the operation of the reactor, the high-speed air flow through the reactor will often bring out some harmful microorganisms and form a high concentration of toxic bioaerosols, which will bring certain ecological risks to the surrounding environment and human health.

Method used

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  • Method for controlling toxic biogas sol in gas-solid phase bioreactor tail gas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] figure 1 It is the comparison of bioaerosol concentration in the exhaust gas of the biological filter tower corresponding to the ultraviolet pretreatment of embodiment 1 and a single biological filter tower. A cylindrical ozone-generating ultraviolet lamp reactor with an effective volume of 2.3L is used as an ozone generating device, and a 3.4L biological filter tower is used as a gas-solid phase bioreactor. The ozone concentration produced in the exhaust gas of the ultraviolet lamp reactor is 140mg / m 3 , the relative humidity of the waste gas stream is 50%, and the gas flow rate in the bioreactor is 0.1m 3 / h, the superficial flow rate is 0.22m / min, under this condition, the concentration of the treated bioaerosol in the outlet gas of the bioreactor is 60CFU / m 3 , which is close to the background value in the surrounding environment, and under the same conditions, the bioaerosol concentration in the exhaust gas of the biological filter tower without pretreatment is 13...

Embodiment 2

[0013] The ozone generator is used as the ozone generating device, and the 3.4L biological filter tower is used as the gas-solid phase bioreactor, and the ozone concentration is 120mg / m 3 , the relative humidity of the waste gas stream is 50%, and the gas flow rate in the bioreactor is 0.2m 3 / h, the superficial flow velocity is 0.44m / min, under this condition, the bioaerosol concentration in the outlet gas of the bioreactor is 106CFU / m 3 , while under the same conditions, the concentration of bioaerosol in the exhaust gas of the biological filter tower without pretreatment is 1580CFU / m 3 .

Embodiment 3

[0015] The ozone generator is used as the ozone generating device, and the 3.4L biological filter tower is used as the gas-solid phase bioreactor, and the ozone concentration is 120mg / m 3 , the air relative humidity is 70%, and the gas flow rate in the bioreactor is 0.3m 3 / h, the superficial flow velocity is 0.66m / min, under this condition, the bioaerosol concentration in the outlet gas of the bioreactor is 240CFU / m 3 , while under the same conditions, the bioaerosol concentration in the exhaust gas of the biological filter tower without pretreatment is 1240CFU / m 3 .

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Abstract

The invention belongs to the technical field of environmental control, in particular to a method for controlling toxic bioaerosol of a tail gas in a gas-solid phase bioreactor. The frontal end of the gas-solid phase bioreactor is provided with an ozone generator or an ozone-generating ultraviolet light. Exhaust gas enters into the gas-solid phase bioreactor after being handled by ozone. The ozone concentration in the gas phase at the outlet of the ozone generator is not less than 100 mg / m <3> (1atm, 20 DEG C), and the relative humidity of exhaust gas is not less than 50 percent, and the internal flow rate of an empty tower in the gas-solid phase bioreactor ranges from 0.2 m / min to 1.2 m / min. The ozone of high concentration is used for killing the microorganism in the air flow, thus effectively reducing the bioaerosol concentration in the air flow at the outlet of the bioreactor. The invention can be applied into controlling the bioaerosol of a tail gas in various gas-solid phase bioreactors, lowering ecological risks and improving the air quality, thus producing remarkable social and economic benefits.

Description

technical field [0001] The invention belongs to the technical field of environmental treatment, and in particular relates to a method for controlling toxic bioaerosol in the tail gas of a gas-solid phase bioreactor. Background technique [0002] Gas-solid phase bioreactors (such as biofiltration towers, biotrickling filtration towers, etc.) are widely used to control environmental pollution of odorous gases and volatile organic compounds, and are one of the research hotspots in gas pollution control technology. The gas-solid phase reactor degrades gaseous pollutants mainly through microorganisms attached to the surface of the filler inside the reactor. The source of microorganisms in the gas-solid phase reactor mostly comes from the sludge or polluted soil of the sewage treatment plant. The inoculated sludge or soil contains a certain amount of pathogenic microorganisms or viruses, and these toxic microorganisms remain in the gas-solid phase reactor and grow and reproduce. ...

Claims

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Application Information

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IPC IPC(8): A61L9/015A61L9/20B01D53/85A61L101/10
CPCY02A50/20
Inventor 胡洪营王灿席劲瑛
Owner TSINGHUA UNIV
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