A method for the enhanced treatment of high-concentration ethylbenzene waste gas by a biological trickling filter

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 ...

AI Technical Summary

Problems solved by technology

[0004] However, the conventional bio-trickling filtration technology can only achieve high removal efficiency when dealing with atmospheric volume and low concentration of organic waste gas. When the concentration is high (>1200mg / 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.