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Discharge gas surface biofiltration scouring method

A biological filtration and exhaust gas technology, applied in chemical instruments and methods, separation methods, air quality improvement, etc., to achieve the effect of large processing capacity, no secondary pollution, and short residence time of exhaust gas

Inactive Publication Date: 2011-04-20
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] To sum up, all kinds of existing biological filtration technologies have the problems of excessive filter layer height, long residence time, low volume load, unstable long-term operation performance or Disadvantages such as relatively small processing capacity severely limit the industrial practical application of gas-phase biological filtration technology

Method used

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  • Discharge gas surface biofiltration scouring method
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  • Discharge gas surface biofiltration scouring method

Examples

Experimental program
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Effect test

Embodiment 1

[0029] Embodiment 1: see figure 1 As shown, the single-stage process flow treatment concentration is 2000mg / m 3 ether exhaust gas. Adopting porosity 90%, aperture is the filter material of the cuboid polyurethane sponge of 20 orders (about 1 millimeter) as the filter material of biological filter medium layer 2, and concrete size is high to be 20cm, wide to be 10cm, thick to be 5cm, and volume is 1L. After the exhaust gas passes through the exhaust gas humidification unit 1, it passes through the biological filter medium layer 2 vertically and horizontally, and the flow rate is about 10m 3 / day, the air velocity of the empty bed is 0.5cm / s, and the residence time of the empty bed is 10s. The amount of nutrient solution containing nitrogen, phosphorus and other nutrient elements and buffers added every day is 1L, and the control unit 6 is sprayed evenly on the whole biological filter medium layer from the top of the filler through the nutrient solution supply unit 3 and the ...

Embodiment 2

[0031] Example 2: see figure 2 As shown, the concentration of 2000mg / m 3 h 2 S and 500mg / m 3 Mixed waste gas of toluene. Every level of biological filtration medium layer 2 all adopts the porosity of filter material to be 90%, and the aperture is a rectangular parallelepiped polyurethane sponge of 20 orders (about 1 millimeter). The height is 20 cm, the width is 10 cm, the thickness is 5 cm, and the volume is 1 L (same implementation example 1). The exhaust gas vertically passes through the filter layer of the first-stage biological filter medium layer 2, and the outlet gas of the first stage flows through the second-stage biological filter medium layer 2, and the H in the outlet air of each stage is measured 2 S and toluene concentrations. Exhaust gas flow is about 1m 3 / day, the air velocity of the empty bed is 0.5cm / s, and the residence time of the empty bed is 10s. Each level supplements 1.5L of nutrient solution containing nitrogen, phosphorus and other nutrient e...

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Abstract

The invention provides a method for filtrating and purifying organisms on the surface of exhaust gas. The method comprises the steps that: (1) a biofiltration dielectric layer is provided: a multihole synthetic filler thin layer with the thickness ranging from 0.02m to 0.2m is used as the biofiltration dielectric layer so that microbes such as bacteria or fungi and so on are attached to and grow on the biofiltration dielectric layer; the filter media is made of the material with the porosity ranging from 90 percent to 98 percent, the aperture ranging from 1mm to 10mm, the opening rate more than 95%, the tensile strength more than 5000Pa, the compressive strength more than 1000Pa, the stacking density ranging from 20kg / m<3> to 600kg / m<3>, and the specific area ranging from 100m<2> / m<3> to 1000m<2> / m<3>; (2) exhaust gas is filtered: the exhaust gas to be purified passes through the biofiltration dielectric layer at the lower flow speed ranging from 0.005 m / s to 0.05m / s and stops on the biofiltration dielectric layer for one to twenty seconds. The device comprises an exhaust gas humidification cell, a biofiltration dielectric layer, a nutrient solution supply cell, a liquid waste disposal cell, a nutrient solution spray header and a control cell. The method and the device provided by the invention have the advantages of uniform distribution of gas, small pressure drop, small height of bed, high cubage and load, large handling capacity, low running cost, stable performance during long running and so on.

Description

technical field [0001] The invention mainly relates to the technical field of biological filtration for air pollution control, in particular to a waste gas surface biological filtration purification method and device, which is especially suitable for removing waste gas containing hydrophilic and easily biodegradable pollutants. Background technique [0002] At present, odor and volatile organic waste gas have seriously polluted the atmospheric environment, destroyed forests and ecosystems, and damaged human health, which has aroused widespread concern. In recent years, biological filtration technology to control air pollution is being increasingly applied to purify odor and organic waste due to its advantages of cost-effectiveness, environmental friendliness, wide application range and low operating cost. [0003] In 1957, patent US2793096 was granted with the concept of soil bed biofiltration. The earliest gas-phase biological filtration system was only covered with loose...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/85
CPCY02A50/20
Inventor 杨春平陈宏曾光明牛秋雅甘海明钟袁元余关龙陈发源
Owner HUNAN UNIV
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