Degradation kinetics of reactive dye by UV/H2O2/US process under continuous mode operation

P. C. Fung, Chi Sun Poon, C. W. Chu, S. M. Tsui

Research output: Journal article publicationJournal articleAcademic researchpeer-review

15 Citations (Scopus)


Degradation of a dye, C.I. Reactive Red 120, in dyeing wastewater by the process of UV/H2O2/US was studied with a bench-scale reactor under the continuous mode of operation. The effects of dyeing wastewater flow rate and the feeding rate of an oxidant, H2O2, on the color removal efficiency of the process were investigated. The significance of ultrasonic (US) combined with UV irradiation was also investigated and the performance of the process on color removal were evaluated. The results showed that the decoloration process followed a pseudo first-order kinetic model and the UV light is the most significant factor on dye removal. Besides, at higher flow rates, incomplete color removal was observed due to relatively insufficient irradiation time (low degradation rate). In order to achieve a higher degradation rate, the feeding rate of H2O2should be increased.
Original languageEnglish
Pages (from-to)67-72
Number of pages6
JournalWater Science and Technology
Issue number6
Publication statusPublished - 17 Nov 2001


  • Continuous operation
  • Feeding rate
  • Hydrogen peroxide
  • Photodecoloration
  • Sonication

ASJC Scopus subject areas

  • Environmental Engineering
  • Water Science and Technology


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