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Method for reinforcing performance of bio-trickling filter in treatment of toluene waste gas

A biological trickling filter tower and exhaust gas technology, applied in chemical instruments and methods, gas treatment, separation methods, etc., can solve the problems of mass transfer rate limitation and restrict the popularization and application of biological filtration technology, so as to improve degradation performance and overcome mass transfer inefficient effect

Active Publication Date: 2017-08-29
NANJING POLYTECHNIC INSITUTE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the limitation of the mass transfer rate of hydrophobic VOCs from the gas phase to the liquid phase, the popularization and application of biofiltration technology in the field of hydrophobic VOCs treatment is seriously restricted.

Method used

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  • Method for reinforcing performance of bio-trickling filter in treatment of toluene waste gas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Polyurethane foam blocks with a side length of 4-6mm are used as fillers to construct the packing layer, 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 to the biological trickling filter in a random way. In the tower, 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.

[0025] 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 7.0.

[0026] The sludge from the secondary sedimentation tank of the coking sewage treatment plant was used as the inoculation strain, and the gas-liquid circulation film-fo...

Embodiment 2

[0034] All the other operations are the same as in Example 1. After the biotrickling filter is successfully coated, adjust the pH value of the nutrient solution to 7.0, when the toluene concentration is 1640mg m -3 , when the concentration ratio of toluene to ethyl acetate is controlled at 1:1.1, the intake rate is 71.8m h -1 , when the residence time is 30s, the removal rate is 45.2±7.7%, and the removal load is 112.7g m -3 h -1 .

Embodiment 3

[0036] All the other operations are the same as in Example 1. After the biotrickling filter is successfully coated, adjust the pH value of the nutrient solution to 7.0, when the toluene concentration is 1640mg m -3 , when the concentration ratio of toluene to ethyl acetate is controlled at 1:1.7, the intake rate is 71.8m h -1 , when the residence time is 30s, the removal rate is 56.8±1.6%, and the removal load is 117.7g m -3 h -1 .

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Abstract

The invention relates to a method for reinforcing the performance of a bio-trickling filter in treatment of toluene waste gas. According to the method, polyurethane foam is used as a filling material, sludge in a secondary se bio-trickling filter dimentation tank of a coking waste water treatment plant is used as an inoculation bacterial strain, the pH value of a nutrient solution is adjusted to 7.0, and the bio-trickling filter is started; low-concentration ethyl acetate waste gas is introduced into toluene waste gas, so the diversity of organisms in the bio-trickling filter is improved, the abundance of functional microbes is enhanced, and the removal of toluene waste gas is improved; and when the concentration of toluene is 1640 mg / m<3> and a concentration ratio of toluene to ethyl acetate is controlled to be 1: 0.5, the removal rate of toluene can reach 95.4 + / -2.2%, and removal load can reach 180.3 g / m<3> / h.

Description

technical field [0001] The invention relates to the technical field of biological filtration for hydrophobic VOCs treatment, in particular to a method for strengthening a biological trickling filter tower to treat toluene waste gas. Background technique [0002] VOCs is the English abbreviation of volatile organic compounds (volatile organic compounds), which is a general term for a class of volatile organic compounds. It usually refers to organic compounds with a saturated vapor pressure greater than 70Pa at normal temperature and a boiling point below 260°C at normal pressure. 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", ref...

Claims

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Application Information

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IPC IPC(8): B01D53/84B01D53/72
CPCB01D53/72B01D53/84B01D2251/95B01D2257/7027B01D2257/708Y02A50/20
Inventor 翟建姜春华仓理耿迪
Owner NANJING POLYTECHNIC INSITUTE
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