Improved hydrodynamic cavitation device with expanded orifice plate for effective chlorotetracycline degradation: Optimization of device and operation parameters

2022 ◽  
Vol 280 ◽  
pp. 119840
Author(s):  
Ludong Yi ◽  
Jun Qin ◽  
Haosheng Sun ◽  
Yinghao Ruan ◽  
Li Zhao ◽  
...  
Keyword(s):  
Orifice Plate ◽  
Hydrodynamic Cavitation ◽  
Operation Parameters

Experimental and Numerical Study of Hydrodynamic Cavitation of Orifice Plates with Multiple Triangular Holes

2012 ◽  
Vol 256-259 ◽  
pp. 2519-2522 ◽  
Author(s):  
Zhi Yong Dong ◽  
Qi Qi Chen ◽  
Yong Gang Yang ◽  
Bin Shi
Keyword(s):  
Velocity Profile ◽  
High Speed ◽  
Numerical Study ◽  
Three Dimensional ◽  
Flow Characteristics ◽  
Orifice Plate ◽  
Hydrodynamic Cavitation ◽  
High Speed Photography ◽  
Hydraulic Characteristics ◽  
Image Velocimetry

Hydraulic characteristics of orifice plates with multiple triangular holes in hydrodynamic cavitation reactor were experimentally investigated by use of three dimensional particle image velocimetry (PIV), high speed photography, electronic multi-pressure scanivalve and pressure data acquisition system, and numerically simulated by CFD software Flow 3D in this paper. Effects of number, arrangement and ratio of holes on hydraulic characteristics of the orifice plates were considered. Effects of arrangement and ratio of holes and flow velocity ahead of plate on cavitation number and velocity profile were compared. Distribution of turbulent kinetic energy and similarity of velocity profile were analyzed. And characteristics of cavitating flow downstream of the orifice plate were photographically observed by high speed camera. Also, a comparison with flow characteristics of orifice plate with hybrid holes (circle, square and triangle) was made.

Influence of Orifice Shape on Reaction Rate by Hydrodynamic Cavitation

2014 ◽  
Vol 625 ◽  
pp. 718-721 ◽  
Author(s):  
Keiji Yasuda ◽  
Toa Kaji ◽  
Zheng Xu
Keyword(s):  
Reaction Rate ◽  
Reaction Rates ◽  
Hole Diameter ◽  
Orifice Plate ◽  
Hydrodynamic Cavitation ◽  
Hole Area ◽  
Upstream Pressure ◽  
Shaped Hole

Hydrodynamic cavitation is expected to apply to the decomposition of chemicals and the disinfection in wastewater. In this study, the effects of upstream pressure, hole diameter and shape of orifice plate on the reaction rate of I3- formation were investigated. The reaction rate increases with increasing upstream pressure of orifice plate. The reaction rates have maximum values, when hole diameters of orifice plate are 2.7 mm at the upstream pressure of 0.9 MPa gauge and 3.0 mm at 0.7 MPa gauge. The reaction rate increases in the order of triangle < square < hexagon < circle shaped hole of orifice plate at the same hole area.

scholarly journals COD removal from sucrose solution using hydrodynamic cavitation and hydrogen peroxide: a comparison between Venturi device and orifice plate

RBRH ◽  
2019 ◽  
Vol 24 ◽  
Author(s):  
Paulo Henrique Lopes Alves ◽  
Pedro de Souza Lopes Silva ◽  
Deusmaque Carneiro Ferreira ◽  
Julio Cesar de Souza Inácio Gonçalves
Keyword(s):  
Removal Efficiency ◽  
Degradation Kinetics ◽  
Sucrose Solution ◽  
Soft Drink ◽  
Cod Removal ◽  
Orifice Plate ◽  
Hydrodynamic Cavitation ◽  
Inlet Pressure ◽  
Cod Removal Efficiency ◽  
Experimental Apparatus

ABSTRACT The aim of the current study is to compare the chemical oxygen demand (COD) removal efficiency of a Venturi device to that of an orifice plate. The inlet pressure in the devices was optimized and the degradation kinetics was analyzed. In addition, the synergistic effect resulting from the combination between cavitation and H2O2 was investigated. An experimental apparatus was built to achieve these goals. A sucrose solution and an effluent from a sucrose-based soft drink industry were treated. Results showed that the Venturi device recorded 90% COD removal efficiency after three treatment minutes. On the other hand, the orifice plate recorded 90% COD removal efficiency after 9 min. The degradation kinetics-reaction order was 3.5, except for the highest Venturi inlet pressure (7.3 bar), which led to coalescence of cavities and to reduced degradation rate. The synergistic coefficient (Sc) was 185.20 and showed that the hybrid process (HC + H2O2) was much more efficient than the cavitation process applied alone. The high COD concentration in the effluent generated by the soft drink industry (2,512.8 mg L-1) was significantly decreased by 72%. The combined use of cavitation and Venturi has significant potential to remove high organic matter concentrations in short treatment periods.

Intensification of advanced oxidation processes (AOPs) for the degradation of bisphenol-A

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Mahendra Chinthala ◽  
Badrinarayana K. Ashwathanarayanaiah ◽  
Soundarya Kulkarni ◽  
Yajnesh Udayakishore ◽  
Aishwarya Halyal ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Bisphenol A ◽  
Orifice Plate ◽  
Hydrodynamic Cavitation ◽  
Inlet Pressure ◽  
Fenton’S Reagent ◽  
Fenton's Reagent ◽  
Initial Concentration ◽  
Oxidation Processes ◽  
Aqueous Streams

Abstract Bisphenol-A (BPA), a precursor for many polymers, is a harmful compound for living organisms if present beyond permissible limits in aqueous streams. The combinations of oxidation processes like Hydrodynamic Cavitation (HC), hydrogen peroxide (H2O2), and Fenton’s reagent (H2O2 + FeSO4) were examined for the degradation of BPA in the present study. The effects of operating parameters like inlet pressure, initial concentration of BPA, orifice geometry were investigated on BPA degradation. The degradation rates of BPA increased with inlet pressure up to 0.5 MPa and then showed a decreasing trend beyond 0.5 MPa. The initial concentration of BPA had an inverse relation with the degradation percentage. The multiple hole orifice plate showed better degradation of BPA compared to the single hole orifice plate. In the intensification studies, the addition of hydrogen peroxide to BPA in the cavitation reactor favored BPA degradation. A combination of HC + Fenton’s reagent (0.1 M H2O2 + 0.01 M FeSO4) significantly degraded BPA present in the aqueous streams.

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