Method for treating nitrobenzene exhaust gas by coupling bacterium biological filter bed

A biological filter bed, nitrobenzene technology, applied in gas treatment, separation methods, chemical instruments and methods, etc., can solve the problems of long start-up period of fungal filter bed, easy to contaminate bacteria, low metabolism rate, etc.

Active Publication Date: 2017-07-04
NANJING POLYTECHNIC INSITUTE
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the fungal reactor itself also has disadvantages. Compared with the aerobic bacterial biological filter bed, the metabolic rate is low, which makes the fungal filter bed start-up period longer.
The fungal filter bed also has the disadvantages of poor biodiversity and easy contamination
In addition, due to its filamentous structure, the reaction is prone to clogging, which restricts the application of fungal filter beds in VOCs exhaust gas treatment
[0006] In summary, there are various problems in the treatment of hydrophobic VOCs waste gas in both bacterial biofiltration bed and fungal biofiltration bed, which seriously restricts the promotion and application of biofiltration technology in the field of hydrophobic VOCs treatment.

Method used

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  • Method for treating nitrobenzene exhaust gas by coupling bacterium biological filter bed
  • Method for treating nitrobenzene exhaust gas by coupling bacterium biological filter bed

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The polyurethane foam blocks with a side length of 4-6mm are used as fillers to construct the packed tower, which not only has a large surface area, but also does not cause compaction after the filler is filmed; the polyurethane foam blocks are filled into the packed tower by random stacking , the porosity of the polyurethane foam block filler is 95%, the pore diameter is 0.8mm, and the bulk density is 0.015g cm -3 , surface area is 1.7cm 2 cm -3 , water holding capacity of 55g-H 2 O g -1 ; The temperature of the packing layer is controlled at 20-25°C.

[0030] Prepared nutrient solution: Contains 0.5g K per liter 2 HPO 4 , 0.1g MgSO 4 ·7H 2 O, 4.5g KH 2 PO 4 , 2g NH 4 Cl and 2mL vitamin and trace mineral solution, the pH value of the nutrient solution was adjusted to 5.0.

[0031]Take the sludge from the secondary settling tank of the sewage treatment plant of the nitrobenzene production enterprise as the inoculation strain, and use the gas-liquid circulatio...

Embodiment 2

[0040] All the other operations are the same as in Example 1. After the biofilter bed is successfully coated, adjust the pH value of the nutrient solution to 5.0, when the nitrobenzene intake concentration is 400mg m -3 , the intake velocity is 107.6m h -1 , the residence time is 20s, the removal rate is 96%, and the removal capacity can reach 69.1g m -3 h -1 .

Embodiment 3

[0042] All the other operations are the same as in Example 1. After the biofilter bed is successfully coated, adjust the pH value of the nutrient solution to 5.0, when the nitrobenzene intake concentration is 350mg m -3 , the intake velocity is 107.6m h -1 , the residence time is 20s, the removal rate is 96.6%, and the removal capacity can reach 60.9g m -3 h -1 .

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Abstract

The invention relates to a method for treating nitrobenzene exhaust gas by a coupling bacterium biological filter bed. Polyurethane foam is used as a filler, the aerobic activated sludge of a nitrobenzene wastewater treatment plant is used as an inoculated strain, and the pH of the nutrient solution is adjusted to 5.0 so that a fungal-bacterial coupled biological filter bed is constructed. Fungi can directly contact with nitrobenzene exhaust gas through hyphae so that the problem that hydrophobic VOCs in the traditional bacterial filter bed have low mass transfer efficiency is solved. Based on the high biological diversity and mineralization capacity of bacteria, fungal metabolites can be further mineralized into carbon dioxide and water. When the nitrobenzene concentration is 300 to 500 mg*m<-3>, the removal rate can reach 95% to 97%, and the removal load can reach 52.4 to 85.5 g*m<-3>*h<-1>.

Description

technical field [0001] The invention relates to the technical field of biological filtration for hydrophobic VOCs treatment, in particular to a method for treating nitrobenzene waste gas with a coupled bacterial biological filter bed. Background technique [0002] VOCs is the English abbreviation of volatile organic compounds (volatile organic compounds), which refers to a class of active volatile organic compounds. VOCs themselves are harmful, such as benzene series and formaldehyde, which can cause cancer. At the same time, VOCs are also precursors of photochemical smog, which will generate O 3 And secondary pollutants such as peroxyacetyl nitrate also play a vital role in the generation of smog. In September 2013, the State Council issued the "Action Plan for the Prevention and Control of Air Pollution", referred to as the "Ten Air Pollution Measures", which clearly pointed out that the control of volatile organic compound pollution should be promoted. The newly revised...

Claims

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Application Information

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IPC IPC(8): B01D53/84B01D53/54
CPCB01D53/54B01D53/84B01D2251/95B01D2257/708Y02A50/20
Inventor 翟建姜春华仓理耿迪
Owner NANJING POLYTECHNIC INSITUTE
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