Investigation on series-wound orifice plate hydrodynamic cavitation (HC) degradation of Rhodamine B (RhB) assisted by several by-pass line orifice plates. (February 2023)

• Record Type: Journal Article
• Authors: Wang, Shinuo; Zhao, Li; Ruan, Yinghao; Qin, Jun; Yi, Ludong; Zhang, Zhaohong; Wang, Jun; Fang, Dawei
• Is Part Of: Journal of water process engineering. Volume 51(2023)
• Publication Date: 2023-02
• Subjects: Dye wastewater treatment -- Series-wound orifice plate HC device -- By-pass line orifice plate assist -- Inorganic oxidant -- Treatment cost; Water-supply engineering -- Periodicals; Saline water conversion -- Periodicals; Seawater -- Distillation -- Periodicals; Sanitary engineering -- Periodicals; Sewage -- Purification -- Periodicals; 627
• DOI: 10.1016/j.jwpe.2022.103404
• Languages: English
• ISSNs: 2214-7144

Abstract

Abstract: In order to overcome the disadvantages of low single treatment effect and long processing cycle of traditional hydrodynamic cavitation (HC) technology in organic dye degradation, a by-pass line orifice plate is used to assist series-wound orifice plates for strengthening the HC effect. In this work, several series-wound orifice plate HC systems with three by-pass line orifice plate connection modes, namely, D-2 (two series-wound orifice plates paralleled with by-pass line orifice plate), D-3 (series-wound orifice plate-1 paralleled with by-pass line orifice plate) and D-4 (series-wound orifice plate-2 paralleled with by-pass line orifice plate), were designed and RhB was used to act as simulated contaminant to conduct the HC degradation experiment. After 60 min treatment under the same conditions, the RhB degradation ratios are 46.12 %, 52.27 % and 31.20 %, respectively, for D-2, D-3 and D-4. And the corresponding mineralization effects are 15.68 %, 24.78 % and 9.83 %, respectively, for D-2, D-3 and D-4. Apparently, D-3 gives the highest degradation ratio and the mineralization effect. The addition of NaClO to D-3 HC system can further enhance the RhB degradation effect, which gives 1.97 synergetic index and 87.28 % RhB degradation ratio. In the future, through continuous modification, it is possible that the by-pass line orifice plate assisted series-wound orifice plate HC technology would be used for large-scale industrial wastewater treatment. Graphical abstract: In order to solve the problems of low single treatment effect and long processing cycle of traditional single orifice plate HC system, in this study the by-pass line orifice plate is adopted to assist series-wound orifice plate HC system. For a series-wound orifice plate HC system, the by-pass line orifice plate can be connected in three ways. For these three assisted HC systems, series-wound orifice plate-1 paralleled with by-pass line orifice plate and orifice plate-2 (D-3) can give a highest RhB degradation ratio (52.27 %), indicating that the use of by-pass line orifice plate can efficiently enhance the RhB degradation ratio compared with 41.17 % for single orifice plate HC system and 44.13 % for series-wound orifice plate HC system. When NaClO is add to the D-3 HC system, after 60 min circulation the RhB HC degradation ratio reaches 87.28 %. At this point, the treatment cost (21.119 USD/m 3 ) is the lowest. Compared with the treatment cost (61.526 USD/m 3 ) without NaClO, the corresponding treatment cost decreases by 65.67 %. Unlabelled Image Highlights: The treatment of dye wastewater via a series orifice plate HC system is realized. Three by-pass line connection modes in series orifice plate HC system are designed. Paralleled mode (D-3) of by-pass line with orifice plate-1 gives a highest HC effect. The 65.67 % treatment cost of RhB can be reduced via adding NaClO into D-3 HC system.