Biologic filtering method for simultaneously desorbing NOX (Nitric Oxide), SO2 and PM2.5 in aerobic environment

A biological filtration, SO2 technology, applied in chemical instruments and methods, separation methods, combined devices, etc., can solve the problems of reduced activity, reduced removal efficiency, troubles, etc., to achieve less secondary pollution, overcome the problem of oxygen inhibition, operation low cost effect

Active Publication Date: 2014-04-16
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the implementation of this method is troubled by the concentration of oxygen in the exhaust gas. Most of the denitrifying bacteria and sulfur bacteria have reduced activity due to the inhibitory effect of oxygen, resulting in SO 2 and NO X The removal efficiency is greatly reduced

Method used

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  • Biologic filtering method for simultaneously desorbing NOX (Nitric Oxide), SO2 and PM2.5 in aerobic environment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Synthetic waste gas: NOx0.5mg / m 3 , SO 2 0.3mg / m 3 , O 2 3%, CO 2 18%. The average volume flow rate of exhaust gas is 10m 3 / h.

[0027] (1) Due to the low intake air volume and intake concentration, only one filler layer 2 is required. The filler is made of polypropylene multifaceted hollow spheres, the diameter of the filler is 25mm, the porosity reaches 0.81, and the density is 0.14g / cm 3 , the specific surface area is 50m 2 / m 3 , a distributor 1 is arranged above the filler.

[0028] (2) Inoculate the cultured composite bacteria on the filler, and regularly measure the waste gas treatment efficiency. After half a month of circulating the film, the net gas efficiency of the waste gas reaches 90%, and the film is successfully formed.

[0029] (3) The main components and proportions of circulating nutrient solution 3 are as follows: glucose 9g / L, NaCl 5g / L, phosphate buffer pH=6.8-7.2, MgSO 4 ·7H 2 O0.1g / L, trace element solution 2ml / L. Trace element rati...

Embodiment 2

[0031] The main components and concentration of exhaust gas from a small boiler: NOx90mg / m 3 , SO 2 60mg / m 3 , O 2 8.1%, CO 2 11.2%, PM 2.5 The content is 400μg / m 3 . The average volume flow rate of exhaust gas is 1762.5m 3 / h.

[0032] (1) According to the amount of gas to be treated, it is determined that the packing is stacked in two layers. The size of the biological trickling filter tower: the inner diameter is 2m, the height is 10m, and the effective volume is about 31.4m 3 .

[0033] (2) In the biological filter tower, there is a distributor above each layer of packing. The hanging film adopts the method of mixed culture of filler and culture medium, so that the microorganisms are well loaded on the surface of the filler, and then loaded into the packed tower. And hang the film for a period of time, so that the biofilm on the filler can adapt to the flue gas treatment environment.

[0034] (3) The main components and proportions of the circulating nutrient s...

Embodiment 3

[0037] Main components and concentrations of flue gas from a coal-fired power plant: NO400mg / m 3 , SO 2 120mg / m 3 , O 2 7.5%, CO 2 10.6%, PM 2.5 The content is 500μg / m 3 . Exhaust gas volume flow is about 10000m 3 / h. (1) According to the amount of gas to be treated, it is determined that the packing is stacked in three layers. The size of the biological trickling filter tower is 4m in inner diameter, 20m in height, and the effective volume is about 251.2m 3 .

[0038] (2) In the biological filter tower, there is a distributor above each layer of packing. The hanging film adopts the method of mixed culture of filler and culture medium, so that the microorganisms are well loaded on the surface of the filler, and then loaded into the packed tower. And hang the film for a period of time, so that the biofilm on the filler can adapt to the flue gas treatment environment.

[0039] (3) The main components and proportions of the circulating nutrient solution are as follow...

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Abstract

The invention discloses a biologic filtering method for simultaneously desorbing NOX (Nitric Oxide), SO2 and PM2.5 in an aerobic environment. A water distribution tank of a circulation nutrient liquid is arranged at the bottom of a bio-trickling filter; the nutrient liquid and fume which is subjected to wetcleaning by using a washing tank are delivered to the top of the bio-trickling filter; the fume carries oxygen; subsequently, the nutrient liquid and the fume pass through a filler layer to which a biologic film is adhered in the bio-trickling filter; fillers are polypropylene multi-surface hollow spheres; NOx and SO2 in the fume are absorbed by liquid phases when passing through the filler layer, and are subsequently absorbed and utilized by microorganisms in the aerobic environment; the PM2.5 in the fume is intercepted by the nutrient liquid and the biologic film; the treated gas is discharged from the bottom of the bio-trickling filter. According to the biologic filtering method, a composite microorganism system is adopted, so that the NOx, SO2 and MP2.5 in the fume can be simultaneously desorbed, and moreover, the problem of inhibiting of the oxygen in the environment is solved, and the biologic filtering method has the advantages of simple process equipment, low energy consumption, low operation cost, small secondary pollution, and the like.

Description

technical field [0001] The invention relates to waste gas treatment technology, biological filtration technology, and environmental pollution control technology in the field of environmental protection, and specifically refers to a method for simultaneously removing NO in an aerobic environment. x and SO 2 biological filtration method. Background technique [0002] There are hundreds of desulfurization technologies currently developed, among which the more practical and feasible technical solutions are raw coal washing, fluidized bed combustion technology, furnace spray absorbent / N wet activation desulfurization process, wet lime / limestone desulfurization process, seawater desulfurization technology, simple wet desulfurization process, spray drying desulfurization process, absorbent regeneration desulfurization process, flue spray absorbent desulfurization process, electron beam irradiation method and more than 10 kinds of technologies. The coal-fired power plant flue gas ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/84B01D53/78B01D53/60B01D50/00
CPCY02A50/20
Inventor 黄少斌吴智导张永清邱灼华
Owner SOUTH CHINA UNIV OF TECH
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