Process for purifying volatile organic waste gas

Abstract

The invention relates to a process for purifying volatile organic waste gas. The process is characterized in that after being pressurized, high-concentration volatile organic waste gas is conveyed into a biological washing tower to flow through a filler layer in the tower from bottom to top and form countercurrent contact with a solution adhered on the filler surface, a liquid phase obtained at the bottom of the tower after washing is conveyed into a biological reactor, and waste gas overflowing from the top of the tower is conveyed into an oxidation furnace; low-concentration volatile organicwaste gas is conveyed into a biological trickling filter for washing from the bottom part, then a gas phase part enters a first filler layer at the middle part of the biological trickling filter, andfirst spraying liquid is sprayed downwards from the top part of the biological trickling filter; after being adsorbed by the filler layer, the mixed waste gas enters the biological filtering pond from the upper part of the biological filtering pond; second spraying liquid is sprayed downwards, is mixed with the gas phase overflowing from the washing tower; after adsorption by a second filler layer, the gas phase is led out and is conveyed to a dehumidifier, the dehumidified gas phase is conveyed to an active-carbon adsorbing tower, and after adsorption by active carbon, the tail gas purifiedto reach the standard can be emptied.

Description

technical field [0001] The invention relates to the treatment of industrial pollutants, in particular to the purification process of volatile organic waste gas VOCs. Background technique [0002] As a characteristic pollutant in the petrochemical industry, VOCs mainly come from organized emissions, unorganized emissions from storage tanks, leakage from production equipment, volatilization during wastewater treatment, process emissions, and solvent volatilization, etc. Among them, wastewater collection, transportation and treatment systems are important. source of emission. In the process of wastewater treatment, due to the VOCs concentration gradient difference between the gas and liquid phases, the influence of changes in ambient temperature and pressure, and the aeration treatment process, most of the volatile organic compounds escape from the wastewater and are discharged in the form of fugitive emissions. way into the atmospheric environment, bringing a series of safety...

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is to provide an organic waste gas purification process that can simultaneously treat multiple pollutants in order to solve the problems of poor pertinence, high investment costs, low safety, A series of problems such as poor stability, high energy consumption, expensive absorption solvent, and low purification efficiency

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