Treatment of oil sands process-affected water using moving bed biofilm reactors: With and without ozone pretreatment

Yijing Shi, Chunkai Huang, Ketley Costa Rocha, Mohamed Gamal El-Din, Yang Liu

Research output: Contribution to journalReview articlepeer-review

42 Scopus citations

Abstract

Two moving bed biofilm reactors (MBBRs) were operated to treat raw (untreated) and 30. mg/L ozone-treated oil sands process-affected water (OSPW). After 210. days, the MBBR process showed 18.3% of acid-extractable fraction (AEF) and 34.8% of naphthenic acids (NAs) removal, while the ozonation combined MBBR process showed higher removal of AEF (41.0%) and NAs (78.8%). Biodegradation of raw and ozone treated OSPW showed similar performance. UPLC/HRMS analysis showed a highest NAs removal efficiency with a carbon number of 14 and a -. Z number of 4. Confocal laser scanning microscopy (CLSM) showed thicker biofilms in the raw OSPW MBBR (97. ±. 5. μm) than in the ozonated OSPW MBBR (71. ±. 12. μm). Quantitative polymerase chain reaction (. q-PCR) results showed higher abundance of gene copies of total bacteria and nitrogen removal relevant bacteria in the ozonated OSPW MBBR, but no significant difference was found. MiSeq sequencing showed Proteobacteria, Nitrospirae, and Acidobacteria were dominant.

Original languageEnglish (US)
Pages (from-to)219-227
Number of pages9
JournalBioresource Technology
Volume192
DOIs
StatePublished - Sep 1 2015

Keywords

  • Biofilm
  • Microbial community
  • Moving bed biofilm reactor (MBBR)
  • Oil sands process-affected water (OSPW)
  • Ozonation

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