Oxidation of Bisphenol A in a Hybrid Oxidative System, Based on the Combined Action of Acoustic and Low-Pressure Hydrodynamic Cavitation

As an endocrine disruptor, bisphenol A (BPA) is a severe threat to human health. In this study, nitrate (NO3-) photolysis with a low-pressure UV lamp (LP-UV) was employed to degrade...

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Analysis on the Causes of Cracking at the Last Stage Blade of the Low-pressure Rotor in thermal power plant

E3S Web of Conferences ◽

10.1051/e3sconf/202016506010 ◽

2020 ◽

Vol 165 ◽

pp. 06010

Author(s):

Liming Xie ◽

Feng Tian ◽

Jun Liu ◽

Hao Chen

Keyword(s):

Power Plant ◽

Thermal Power Plant ◽

High Speed ◽

Static Load ◽

Thermal Power ◽

Low Pressure ◽

Transverse Cracking ◽

Combined Action ◽

Last Stage ◽

Sem Microstructure

Transverse cracking occurred in the blade body of the last stage of the low pressure rotor of a 200MW unit in a thermal power plant. The causes of blade cracking were analyzed by means of macro morphology, SEM, microstructure, mechanical properties, chemical composition and energy spectrum analysis. The results show that the corrosive Cl- accumulates on leaves, and then combined action of tensile stress is formed with the static load and dynamic load during the blade operation, and the stress corrosion microcracks had been conceived in the Cl- corrosion region. Under the long period cyclic excitation stress of the blade during the rotor rotation at high speed, the crack source extends in fatigue mode, finally resulting in cracking.

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

International Journal of Chemical Reactor Engineering ◽

10.1515/ijcre-2021-0052 ◽

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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