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Formaldehyde biodegradation using an immobilized bed aerobic bioreactor with pumice stone as a support

Ebrahimi, S ; Sharif University of Technology

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  1. Type of Document: Article
  2. DOI: 10.1016/j.scient.2011.01.001
  3. Abstract:
  4. The objective of this study is the investigation of formaldehyde degradation in a bioreactor with pumice stone as a support. The reactor was tested at different synthetic wastewater concentrations with total COD of 500, 1000 and 1500 mgL, respectively, at 24 h hydraulic retention time. The effect of feed composition was tested by changing the COD TCOD FA ratio in order to analyze the impact of formaldehyde concentration. The average formaldehyde and COD removal efficiencies obtained in the reactor were 97.1% and 88%, respectively. The maximum COD and formaldehyde removal efficiencies occurred at the COD TCOD F of 41 at COD T=1000mgL. The effect of toxic shock on reactor performance was examined; the reactor has good resistance against a sudden increase in formaldehyde concentration. The formaldehyde concentration threshold at which toxic effects severely inhibited the biological process was 1370 ppm. So a fixed film bioreactor packed with pumice stone could be recommended for the treatment of formaldehyde-containing wastewater
  5. Keywords:
  6. Biological treatment ; Pumice stone ; Toxic biodegradation ; Aerobic bioreactors ; Aerobic treatment ; Biological process ; COD removal efficiency ; Feed compositions ; Fixed film ; Formaldehyde concentrations ; Formaldehyde degradation ; Hydraulic retention time ; Reactor performance ; Removal efficiencies ; Synthetic waste water ; Toxic effect ; Toxic shocks ; Biodegradation ; Bioreactors ; Degradation ; Microbiology ; Toxic materials ; Wastewater ; Wastewater treatment ; Formaldehyde ; Chemical oxygen demand ; Oxic conditions ; Pumice ; Toxic substance ; Toxicity test
  7. Source: Scientia Iranica ; Volume 18, Issue 6 , December , 2011 , Pages 1372-1376 ; 10263098 (ISSN)
  8. URL: http://www.sciencedirect.com/science/article/pii/S1026309811002331