Abstract

Activated sludge acclimated to biodegrade phenol was allowed to attach on and in light porous ceramic carriers and to function as a biofilm in a photolytic circulating-bed bioreactor (PCBBR). Phenol degradation in the PCBBR was investigated following three protocols: photolysis with ultraviolet light alone (P), biodegradation alone (B), and the two mechanisms operating simultaneously (P/B). Phenol was degraded at approximately equal rates by B and P/B, each of which was much faster than the rate by P. Furthermore, phenol was mineralized to a significantly greater extent with P/B than with either P or B. SEM showed that the biofilm survived well inside macropores that presumably shaded the microorganisms from UV irradiation, even though the UV light greatly reduced biofilm on outer surface of the carriers in the P/B experiments. Rapid biodegradation of phenol, enhanced mineralization, and survival of bacteria inside macropores demonstrated that being in a biofilm inside the porous carriers protected the bacteria from UV-light toxicity, allowing intimate coupling of photolysis and biodegradation.

Original languageEnglish (US)
Pages (from-to)881-887
Number of pages7
JournalBiodegradation
Volume21
Issue number6
DOIs
StatePublished - Nov 2010

Fingerprint

Biofilms
Ceramics
Phenol
ceramics
Phenols
biofilm
phenol
irradiation
Irradiation
Ultraviolet Rays
Biodegradation
biodegradation
Photolysis
macropore
Bioreactors
photolysis
Ultraviolet radiation
bioreactor
Bacteria
bacterium

Keywords

  • Biofilm
  • Circulating-bed bioreactor
  • Phenol
  • Photobiodegradation
  • Photolysis

ASJC Scopus subject areas

  • Environmental Engineering
  • Pollution
  • Environmental Chemistry
  • Microbiology
  • Bioengineering

Cite this

Photobiodegradation of phenol with ultraviolet irradiation of new ceramic biofilm carriers. / Zhang, Yongming; Liu, Hong; Shi, Wen; Pu, Xuejing; Zhang, Husen; Rittmann, Bruce.

In: Biodegradation, Vol. 21, No. 6, 11.2010, p. 881-887.

Research output: Contribution to journalArticle

Zhang, Yongming ; Liu, Hong ; Shi, Wen ; Pu, Xuejing ; Zhang, Husen ; Rittmann, Bruce. / Photobiodegradation of phenol with ultraviolet irradiation of new ceramic biofilm carriers. In: Biodegradation. 2010 ; Vol. 21, No. 6. pp. 881-887.
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