An efficient treatment for degradation of high-concentration xylene gas via water falling film discharge in synergy with silver catalysis

In this paper, an efficient treatment using water falling film discharge combined with silver catalysis to degrade xylene gas with high concentration was reported. It is found that the composite technique not only effectively removed gaseous xylene, but also eliminated the emission of unexpected by-products (e.g. ozone, toxic organic intermediates and NOX). Under the control voltage of 60V and gas-water ratio of 100:1, the reactor could continuously operate for 6 days to degrade xylene with concentration of 2400 mg/m(3), of which the removal rate could still meet the requirement of discharge standard. More-over, the content of undesirable products in circulating water was also kept at a low level. The synergistic effect of plasma oxidation and selective catalytic reduction of NOX with O-3 over Ag catalyst played a key role in mineralization of target pollutant. The research could provide a reference for the design of efficient hybrid system with high safety for the degradation of high-concentration hydrophobic volatile organic compounds. (C) 2020 Elsevier Ltd. All rights reserved.