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Purification method and system for VOCs exhaust gas in constructed wetlands

A technology for exhaust gas purification systems and constructed wetlands, applied in chemical instruments and methods, separation methods, gas treatment, etc., can solve the problems of high manufacturing and operating costs of membrane separation methods, unsuitable for large-scale industrial applications, and catalyst deactivation. , to achieve the effect of improving the quality of the atmospheric environment, eliminating adverse effects, and no secondary pollution

Active Publication Date: 2018-05-08
NANJING POLYTECHNIC INSITUTE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

(1) Combustion is the most widely used chemical oxidation method. This method is suitable for high-concentration volatile organic waste gas that is difficult to recycle. However, if the waste gas cannot be fully mixed with air and burned, the product will contain harmful substances such as dioxins. components, will cause secondary pollution, and for low-concentration organic waste gas, which cannot be directly burned, concentration pretreatment is required
On this basis, a small amount of combustion auxiliary agent is added to make the regenerative combustion method gradually mature, with low energy consumption and a treatment efficiency of 99%. However, when treating organic waste gas with complex components, it is easy to cause catalyst poisoning and reduce the treatment effect, and the catalyst is generally precious metal. , the cost is higher
(2) The physical separation method can recycle the separated organic matter. However, the condensation method needs to be concentrated first when dealing with low-concentration organic waste gas. The manufacturing and operation costs of the membrane separation method are relatively high, and the adsorption method needs to constantly replace the adsorbent. Operating cost, analysis and desorption process is also easy to cause secondary pollution
Most of the absorbents in the absorption method have certain toxicity and polluting organic solvents, which will cause secondary pollution in the subsequent absorption process
(3) The photolysis method is a new technology to deal with a variety of refractory and low-concentration organic compounds, but it is not suitable for large-scale industrial applications, because when the accumulation of organic matter on the surface of the catalyst is too high, the catalyst will lose its activity
However, when the conditions are not well controlled, the corresponding products are unstable

Method used

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  • Purification method and system for VOCs exhaust gas in constructed wetlands
  • Purification method and system for VOCs exhaust gas in constructed wetlands
  • Purification method and system for VOCs exhaust gas in constructed wetlands

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Embodiment 1

[0036] This embodiment specifically illustrates the technical solution of the system of the present invention.

[0037] Such as Figure 1-Figure 3 The shown constructed wetland VOCs exhaust gas purification system includes a constructed wetland pool body 1, a filler, a water inlet device, a water outlet device, an air distribution device 5 and aquatic plants 6; the constructed wetland pool body 1 is formed by excavating earth below the ground , And tamped clay on the inner wall as an impermeable layer; the constructed wetland pool body 1 is divided into filling area 2 and water distribution area 3 in the horizontal direction. Filling area 2 and water distribution area 3 are separated by perforated plates 7, and water distribution area 3 is provided with Water inlet device 31; there is a filler in the filler area 2, and the filler area 2 in the vertical direction from bottom to top is a water-saturated filler layer 22 and a water-unsaturated filler layer 21; above the filler layers...

Embodiment 2

[0043] This example illustrates the method of using the system described in Example 1.

[0044] In this embodiment, the system structure size is as specific as figure 1 As shown, the pool body: the pool body of the constructed wetland is rectangular on the plane (round, square or irregular shape can also be used), the thickness of the impermeable layer is 0.05m, and the degree of compaction is 97%; the height of the filling in the pool is 1.0m, the height of the saturated water layer at the bottom is 0.7m, the height of the top unsaturated layer is 0.3cm, the super height is 0.3m, and the total height is 1.3m.

[0045] The service area of ​​the air distribution device in this embodiment is 0.3-1.5m 2 / m, ventilation volume 1-10m 3 / m﹒ h, the pore density is 15000-20000 / m, the stroke bubble diameter is 0.5-5mm.

[0046] The system operating parameters are as follows:

[0047] The particle size of the medium volcanic slag is 2-3cm;

[0048] Air inlet flow rate 100-200m 3 / h;

[0049] Air...

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Abstract

The invention relates to a purification method and system for VOCs exhaust gas in constructed wetlands. A main functional area of the system consists of two parts, namely the water-saturation packinglayer and the water unsaturation packing layer; VOCs gas firstly enters the saturation packing layer through a gas distribution device, packing on the saturation packing layer and a biological film attached on the surface of the packing are completely immersed in sewage, and the VOCs exhaust gas degradation mechanism follows the 'absorption-biological-film theory'; then the VOCs gas enters the unsaturation packing layer, removal of a pollutant is in line with 'absorption-biological-film theory'; finally, the purified gas is discharged out of a wetland system from the top. The sewage uniformlyenters a medium through a perforated plate from a water distribution region and horizontally flows, meanwhile, nutrient elements are provided for the biological film attached on the packing layer, health and stable vital activities of the biological film are maintained, and finally, the sewage is discharged from the system through a water discharge device. According to the method and the system, the VOCs exhaust gas which is produced in industrial production, construction materials and transportation, is low in concentration and free from recovery value, and seriously pollutes the environmentcan be efficiently purified.

Description

Technical field [0001] The invention belongs to the technical field of environmental protection, and specifically relates to a biological ecological treatment technology that can treat volatile organic compounds (VOCs)-a constructed wetland VOCs waste gas treatment process. The method is aimed at low concentrations generated in industrial production, building materials, and transportation. , A new type of waste gas treatment method developed for organic waste gas with no recovery value and serious environmental pollution. Background technique [0002] With the rapid economic development, the pollution problem of volatile organic compounds (VOCs) is becoming more and more serious. Not only are there many types, but most of them are toxic, and have carcinogenic, teratogenic, and mutagenic effects. In particular, benzene, toluene and xylene are harmful to human health. Cause a lot of damage. In addition to its own hazards, VOCs can easily cause secondary pollution. In cities or in...

Claims

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Application Information

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IPC IPC(8): B01D53/85B01D53/44C02F3/32C02F3/00
CPCB01D53/44B01D53/85B01D2257/708C02F3/00C02F3/32Y02A50/20
Inventor 董婵
Owner NANJING POLYTECHNIC INSITUTE
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