Investigation on the Removal of NO from SO2-Containing Simulated Flue Gas by an Ultraviolet/Fenton-Like Reaction

The removal process of NO from SO 2 -containing simulated flue gas using an ultraviolet (UV)/Fenton-like reaction in a photochemical reactor was investigated. The effects of several operating parameters, such as the H 2 O 2 concentration, Cu 2+ concentration, solution pH, NO concentration, solution temperature, gas flow, SO 2 concentration, and O 2 concentration on NO removal were studied using a single-factor method. The liquid anions were measured by ion chromatography, and the material balances for NO and SO 2 were also calculated. The results show that, with the increase in the Cu 2+ concentration, NO removal efficiency significantly increases. With the increase in the H 2 O 2 concentration, NO removal efficiency increases, but the changes gradually become smaller. NO removal efficiency greatly reduces with an increasing gas flow and NO concentration. An increasing solution temperature or SO 2 concentration slightly decreases NO removal efficiency. An increase in the O 2 concentration can promote the removal of NO. The anions in the liquid phase are mainly SO 4 2– and NO 3 – . The calculated values of SO 4 2– and NO 3 – are overall in agreement with the measured values.