A study on simultaneous removal of NO and SO2 by using sodium persulfate aqueous scrubbing  

作　　者：Xue Kang Xiaoxun Ma Jian'an Yin Xuchun Gao 

机构地区：[1]School of Chemical Engineering,Northwest University,Xi'an 710069,China [2]Chemical Engineering Research Center of the Ministry of Education(MOE)for Advanced Use Technology of Shanbei Energy,Xi'an 710069,China [3]Shaanxi Research Center of Engineering Technology for Clean Coal Conversion,Xi'an 710069,China [4]International Scientific and Technological Cooperation Base of the Ministry of Science and Technology(MOST)for Clean Utilization of Hydrocarbon Resources.Xi'an 710069,China [5]Xi'an Shaangu Power Co.,Ltd.,Xi'an 710075,China

出　　处：《Chinese Journal of Chemical Engineering》2018年第7期1536-1544,共9页中国化学工程学报（英文版）

基　　金：Supported by the National Natural Science Foundation of China(21536009);Science and Technology Plan Projects of Shaanxi Province(2017ZDCXL-GY-10-03)

摘　　要：Nitric oxide （NO） removal and sulfur dioxide （SO2） removal by sodium persulfate （Na2S2O8） were studied in a Bubble Column Reactor. The proposed reaction pathways of NO and SO2 removal are discussed. The effects of temperatures （35-90℃）, Na25208 （0.05-0.5 mol·L-1）, FeSO4 （0.5-5.0 m mol·L-1） and H2O2 （0.25 mol·L-1） on NO and SO2 removal were investigated. The results indicated that increased persulfate concentration led to increase in NO removal at various temperatures. SO2 was almost completely removed in the temperature range of 55-85 ℃. Fe2 ＋ accelerated persulfate activation and enhanced NO removal efficiency. At 0.2 mol· L- 1 Na2S2O8 and 0.5-1.0 mmol· L-1Fe2 ＋, NO removal of 93.5%-99% was obtained at 75-90 ℃, SO2 removal was higher than 99% at all temperatures. The addition of 0.25 mol. L i H202 into 0.2 mol·L-1· Na2S2O8 solution promoted NO removal efficiency apparently until utterly decomposition of H2O2, the SO2 removal was as high as 98.4% separately at 35 ℃ and 80 ℃.Nitric oxide(NO) removal and sulfur dioxide(SO_2) removal by sodium persulfate(Na_2S_2O_8) were studied in a Bubble Column Reactor. The proposed reaction pathways of NO and SO_2 removal are discussed. The effects of temperatures(35–90 °C), Na_2S_2O_8(0.05–0.5 mol·L^(-1)), Fe SO4(0.5–5.0 m mol·L^(-1)) and H_2O_2(0.25 mol·L^(-1))on NO and SO_2 removal were investigated. The results indicated that increased persulfate concentration led to increase in NO removal at various temperatures. SO_2 was almost completely removed in the temperature range of 55–85 °C. Fe^(2+)accelerated persulfate activation and enhanced NO removal efficiency. At 0.2 mol·L^(-1) Na_2S_2O_8 and 0.5–1.0 mmol·L^(-1) Fe^(2+), NO removal of 93.5%–99% was obtained at 75–90 °C, SO_2 removal was higher than 99% at all temperatures. The addition of 0.25 mol·L^(-1) H_2O_2 into 0.2 mol·L^(-1) Na_2S_2O_8 solution promoted NO removal efficiency apparently until utterly decomposition of H2 O2, the SO_2 removal was as high as98.4% separately at 35 °C and 80 °C.

关 键 词：SIMULTANEOUS removal of NO and SO2 Sodium persulfate Ferrous sulfate Hydrogen peroxide Active radicals 

分 类 号：TQ028.2[化学工程] X701[环境科学与工程—环境工程]