Typical Application of Sound Field in Wastewater Treatment with Fluidized Bed Photocatalytic Reactor

Author： Si Chong-dian Zhou Jing Gao Hong-tao Liu Guang-jun Wu Jian-jun

E-ISSN： 1554-7531|87|4|378-383

ISSN： 1061-4303

Source： Water Environment Research, Vol.87, Iss.4, 2015-04, pp. : 378-383

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Abstract

ABSTRACT: The effect of a sound field on wastewater treatment with a fluidized bed photocatalytic reactor (FBPR) was investigated. With Alizarin Green (AG) being the sole infectant, the Fe-doped TiO₂ catalyst prepared was used as the fluidized media. According to the Langmuir-Hinshelwood model, the photocatalytic degradation follows the pseudo-first-order reaction kinetics with respect to the concentration of AG. Sound field application allowed the fluidization of the fine powder at high liquid flow rates; thus, the mass transfer rate between organic pollutant and particle photocatalyst was enhanced and the efficiency of degradation was increased. As expected, the degradation rate constant increased with increasing sound pressure level, as well as increased with increasing sound frequency ranging from 50 to 100 Hz, then further decreased with increasing sound frequency from 100 to 200 Hz. In addition, Fe doping is also responsible for the enhanced photocurrent response of the Fe-doped TiO₂ nanoparticle in FBPR relative to pure TiO₂.