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Method for enhancing high-concentration ethylbenzene waste gas treatment by using biological trickling filter

A bio-trickling, high-concentration technology, applied to chemical instruments and methods, separation methods, air quality improvement, etc., can solve the problems of unsatisfactory removal effect, limited biodegradation rate, low mass transfer efficiency, etc., and achieve biological The effects of high diversity, increased biodegradation rate, and shortened domestication time

Active Publication Date: 2013-06-26
ZHEJIANG GONGSHANG UNIVERSITY
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  • Abstract
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AI Technical Summary

Problems solved by technology

[0004] However, conventional bio-trickling filtration technology can only achieve high removal efficiency when dealing with atmospheric volume and low-concentration organic waste gas. When the concentration is high (>1200 mg / m 3 ), the removal effect is not satisfactory
The reason for the low efficiency of conventional bio-trickling filtration technology to remove high-concentration VOCs is mainly due to the low mass transfer efficiency of hydrophobic VOCs from the gas phase to the microbial phase that can be utilized by microorganisms, thereby limiting the subsequent biodegradation rate.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0023] The present invention will be further described in detail below in conjunction with specific embodiments.

[0024] In this example, a four-layer biological trickling filter is used to treat ethylbenzene waste gas, and a surfactant and its co-solvent are used to enhance the removal efficiency of the device for ethylbenzene.

[0025] The main body of the device is two plexiglass columns with an inner diameter of 100 mm and a height of 780 mm. The column is equipped with four layers of polyurethane sponge packing (10 PPI) with a diameter of 100 mm and a height of 100 mm, and the layers are separated by sieve plates with dense small holes. The wetted ethylbenzene gas is passed into the column through the upper air inlet, and is discharged from the lower air outlet after being treated by the microorganisms grown on the filter material. The nutrient distribution system of the device consists of a spray device at the top of the column, a water pump, and a nutrient solution st...

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Abstract

The invention discloses a method for enhancing high-concentration ethylbenzene waste gas treatment by using a biological trickling filter. According to the invention, a biological trickling filter device is inoculated by using active sludge; domestication is carried out under low-concentration ethylbenzene waste gas; when domestication is finished, the ethylbenzene is regulated to a high concentration range; when high-concentration ethylbenzene removing efficiency is stabilized, a non-ionic surfactant and an inorganic salt cosolvent are added into a nutrient solution; with a solubilization effect of the surfactant, a mass transfer process of slightly soluble organics between three phases of gas, liquid, and bio-membrane is promoted. Therefore, bioavailability is improved, and degradation efficiency is improved. With the method provided by the invention, running device and other running conditions are not changed, and operation process continuous long-time running can be ensured. The method is economical, and has the advantages of high efficiency, environment friendliness, and convenient operation and maintenance.

Description

technical field [0001] The invention belongs to the technical field of organic waste gas treatment, and relates to a method for improving the treatment efficiency of ethylbenzene in a biological trickling filter by using a surfactant and a cosolvent thereof. Background technique [0002] Ethylbenzene is one of the important components of BTEX in crude oil and petroleum. It is an important chemical raw material. It is mainly used as an intermediate for the production of styrene by dehydrogenation, an intermediate for synmycin in medicine, and nitro in the paint industry. It is used as a thinner for spray paint and as a solvent for various organic substances in organic synthesis. Due to its good volatility, a considerable amount of ethylbenzene gas will volatilize into the air during the process of manufacture and use. The ethylbenzene waste gas will not only pollute the atmospheric environment, but also damage human health to a large extent. , and even produce three effects ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/84B01D53/72
CPCY02A50/20
Inventor 杨春平王璐程燕涂燕虹吕黎何慧军陈昆柏赵跃华张其殿
Owner ZHEJIANG GONGSHANG UNIVERSITY
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