An efficient treatment for degradation of high-concentration xylene gas via water falling film discharge in synergy with silver catalysis. (20th September 2020)

• Record Type: Journal Article
• Authors: Zhao, Chunfeng; Liu, Shuai; Hu, Jianchen; Yang, Xiaojing; Huang, Lei; Su, Yanyu; Liu, Deqi
• Is Part Of: Journal of cleaner production. Volume 268(2020)
• Publication Date: 2020-09-20
• Subjects: Water falling film discharge -- Synergistic catalytic effect -- Xylene degradation -- Toxic organic intermediates -- NOX selective Catalytic reduction; Factory and trade waste -- Management -- Periodicals; Manufactures -- Environmental aspects -- Periodicals; Déchets industriels -- Gestion -- Périodiques; Usines -- Aspect de l'environnement -- Périodiques; 628.5
• DOI: 10.1016/j.jclepro.2020.122277
• Languages: English
• ISSNs: 0959-6526

Abstract

Abstract: 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. Moreover, 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 O3 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. Graphical abstract: Image 1 Highlights: A hybrid system was proposed for degradation of xylene gas with high concentration. Water film absorbed hydrophilized VOCs and hence enhanced gas-liquid mass transfer. Water falling film DBD with Ag catalysis strongly increased removal rate of xylene gas. Water falling film DBD with Ag catalysis eliminated emission of toxic by-products. The hybrid system presented excellent long-term working stability.