Photocatalytic treatment of high concentration carbamazepine in synthetic hospital wastewater

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Abstract

Effective and sustainable treatment of hospital wastewater containing high concentration of pharmaceutical compounds presents a pivotal challenge to wastewater and environmental engineers worldwide. In this study, a titanium dioxide (TiO 2) nanofiber based wastewater treatment process was assessed as a pre-treatment system to treat and enhance the biodegradability of a representative pharmaceutical compound, 5000μg/L of carbamazepine (CBZ), in synthetic hospital wastewater. Results showed that the stand-alone TiO 2 pre-treatment system was capable of removing 78% of CBZ, 40% of COD and 23% of PO 4 concentrations from the influent wastewater within a 4h reaction time. High performance size exclusion chromatography demonstrated that a simultaneous biodegradability enhancement of hospital wastewater was observed, whereby an apparent shift in molecular weight from higher fraction (>10-1000kDa) to a lower fraction (<10kDa) was induced after 0.5h of photocatalytic treatment. Eventually, it was found that the photodegradation profile for high concentration CBZ in synthetic hospital wastewater was perfectly fitted to the Langmuir-Hinshelwood kinetics model. It is anticipated that this TiO 2 pre-treatment process can be further integrated with a biological wastewater treatment process to deliver treated hospital effluent of better quality that can minimise the associated human health and environmental risks.

Original languageEnglish
Pages (from-to)135-142
Number of pages8
JournalJournal of Hazardous Materials
Volume199-200
DOIs
Publication statusPublished - 15 Jan 2012
Externally publishedYes

Keywords

  • Carbamazepine
  • Hospital wastewater
  • Nanofiber
  • Photocatalysis
  • Pre-treatment
  • TiO

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