Využití metody fotochemické oxidace při eliminaci emisí z odpadního vzduchu

Abstract

This diploma thesis deals with the elimination of emissions of organic matter from the exhaust air using innovative technology using advanced oxidation processes. Styrene was chosen as a model contaminant, while the effect of varying initial styrene concentrations and different airflow rates on the resulting conversion was studied. The whole technology consists of two stages. The first stage is photochemical, consisting of a flow reactor with 4 built-in low-pressure ozone-generating UV lamps (λ = 190 nm). In the case of the lowest tested styrene inputs and air flow rates, 100% conversion of styrene was achieved. However, with increasing air flow and increasing input concentration conversions have fallen sharply. The inlet styrene concentration ranged from 50 ppm to 200 ppm with air flow ranging from 0,5 to 1,5 m.s-1. The second stage, which followed the photochemical stage, involved oxidation using UV irradiation and hydrogen peroxide, which took place in an absorber in which water with hydrogen peroxide was sprayed through the nozzles. Conversion of styrene was the highest at low entry styrene levels, the effect of air flow was no longer unambiguous. The cost of running the technology for the elimination of organic matter from the exhaust air in the current design is relatively high, yet it is an innovative technology capable of eliminating exhaust emissions in real conditions. Further research will focus on adjusting and optimizing individual steps.