4.4 Article

Impact of ozonation pre-treatment of oil sands process-affected water on the operational performance of a GAC-fluidized bed biofilm reactor

期刊

BIODEGRADATION
卷 25, 期 6, 页码 811-823

出版社

SPRINGER
DOI: 10.1007/s10532-014-9701-6

关键词

Fluidized bed biofilm reactor; Oil sands process-affected water; Ozonation; Naphthenic acids; Polymerase chain reaction; Acid-extractable fraction

资金

  1. Helmholtz-Alberta Initiative
  2. NSERC Industrial Research Chair Program in Oil Sands Tailings Water Treatment
  3. Syncrude Canada Ltd.
  4. Suncor Energy Inc.
  5. Shell Canada
  6. Canadian Natural Resources Ltd.
  7. Total EP Canada Ltd.
  8. EPCOR Water Services
  9. IOWC Technologies Inc.
  10. Alberta Innovates-Energy and Environment Solution
  11. Alberta Environment and Sustainable Resource Development

向作者/读者索取更多资源

Treatment of oil sands process-affected water (OSPW) using biodegradation has the potential to be an environmentally sound approach for tailings water reclamation. This process is both economical and efficient, however, the recalcitrance of some OSPW constituents, such as naphthenic acids (NAs), require the pre-treatment of raw OSPW to improve its biodegradability. This study evaluated the treatment of OSPW using ozonation followed by fluidized bed biofilm reactor (FBBR) using granular activated carbon (GAC). Different organic and hydraulic loading rates were applied to investigate the performance of the bioreactor over 120 days. It was shown that ozonation improved the adsorption capacity of GAC for OSPW and improved biodegradation by reducing NAs cyclicity. Bioreactor treatment efficiencies were dependent on the organic loading rate (OLR), and to a lesser degree, the hydraulic loading rate (HLR). The combined ozonation, GAC adsorption, and biodegradation process removed 62 % of chemical oxygen demand (COD), 88 % of acid-extractable fraction (AEF) and 99.9 % of NAs under optimized operational conditions. Compared with a planktonic bacterial community in raw and ozonated OSPW, more diverse microbial communities were found in biofilms colonized on the surface of GAC after 120 days, with various carbon degraders found in the bioreactor including Burkholderia multivorans, Polaromonas jejuensis and Roseomonas sp.

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