Discharge gas surface biofiltration scouring method and device

A biological filtration and purification device technology, applied in chemical instruments and methods, separation methods, air quality improvement, etc., can solve the problems of restricting the practical application of gas-phase biological filtration technology in industry, unstable long-term operation performance, high construction and operation costs, etc., to achieve No secondary pollution, short residence time of waste gas and large treatment capacity

Inactive Publication Date: 2008-08-27
HUNAN UNIV
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  • Abstract
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Problems solved by technology

However, it also has disadvantages such as high construction and operation costs, and it is not suitable for large-scale waste gas treatment.
[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 and device
  • Discharge gas surface biofiltration scouring method and device

Examples

Experimental program
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Effect test

Embodiment 1

[0027] Embodiment 1: see figure 1 As shown, the single-stage process flow treatment concentration is 2000mg / m 3 ether exhaust gas. Adopting porosity 90%, the cuboid polyurethane sponge that aperture is 20 orders (about 1 millimeter) is used as the filter material of biological filter medium layer 2, and specific size is high and is 20cm, and width is 10cm, and thickness is 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 sprays evenly on the whole biological filter medium layer from the top of the filler through the nutrient solution supply unit 3 and the nutrient s...

Embodiment 2

[0029] 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. The porosity of filter material 2 all adopts 90% of filter material, and the aperture is the cuboid polyurethane sponge of 20 orders (about 1 millimeter), and height is 20cm, and width is 10cm, and thickness is 5cm, and volume is 1L (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 elements and buffers every day. The control unit 6 sprays evenly...

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Abstract

The invention provides a method for filtrating and purifying organisms on the surface of exhaust gas and a device thereof. 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 Applications(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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