A method for recovering volatile organic compounds in exhaust gas as a carbon source for denitrification

Abstract

A method for recovering volatile organic compounds in waste gas as a carbon source for denitrification involves volatile organic compounds. The method comprises the following steps: 1) multi-stage countercurrent absorption of volatile organic waste gas; 2) pumping part of the absorption liquid in the first absorption device in step 1) into a fermentation tank for fermentation to obtain a fermentation liquid; 3) converting Step 2) the obtained fermentation liquid is introduced into the absorption liquid of the first absorption device; 4) the fermentation liquid in the fermentor in step 2) is used for denitrification carbon source; 5) the gas produced by the fermenter is introduced with a pipeline into the first absorber. It is suitable for the recovery and comprehensive utilization of volatile organic waste gas, that is, to treat waste gas containing volatile organic compounds with less investment and operation and maintenance costs, and to obtain denitrification carbon sources for sewage, that is, to treat the environment and save resources.

Description

technical field [0001] The invention relates to volatile organic compounds, in particular to a method for recovering volatile organic compounds in waste gas as a carbon source for denitrification. Background technique [0002] Volatile organic compounds are O in the atmosphere 3 The important precursors of PM2.5 and PM2.5 are the focus and difficulty of air pollution control. The accumulation of a large amount of volatile organic compounds in the air can also easily lead to high COD concentration in the first rain in the urban rainfall process, and become an important pollution source of rivers, lakes, soil and other environments together with nitrogen and phosphorus. [0003] The organic components of waste gas containing volatile organic compounds are usually alcohols (methanol, ethanol, propanol, ethylene glycol, etc.), aldehydes (formaldehyde, acetaldehyde, etc.), ketones (acetone, methyl ethyl ketone, etc.), organic acids (formic acid, acetic acid, propionic acid, but...

AI Technical Summary

Problems solved by technology

[0009] Chinese patent 201710416548.8 discloses a method for concentrating and treating low-concentration waste gas containing volatile organic compounds. It introduces a method for absorbing and concentrating organic waste gas in multi-stage countercurrent, but long-term use has the problem of emulsification and difficulty in separation.

Chinese patent application 201810615466.0 discloses a formula and preparation method of a composite carbon source for denitrification, and introduces a scheme containing ethanol, sodium acetate, calcium acetate, and glucose as a composite carbon source for denitrification, but the ingredients are all derived from industrial products, and the cost It is relatively high and also has the problem of volatile organic pollution in the process of production, transportation and use

The survey results show that various technologies have a certain removal rate, but the differences in the use place, configuration and operation and maintenance lead to large fluctuations in the removal rate

[0011] Water spray + solution absorption has a higher removal rate of volatile organic compound waste gas containing alcohols, ketones and ethers with higher solubility. The lower removal rate may be due to the low solubility or volatility of volatile organic compounds. After the absorption of organic matter is saturated, the absorption capacity decreases to

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