期刊
JOURNAL OF HAZARDOUS MATERIALS
卷 347, 期 -, 页码 470-477出版社
ELSEVIER
DOI: 10.1016/j.jhazmat.2017.12.013
关键词
Ozonation; Optimization; Naphthenic acids; MLE-MBR; Refractory industrial wastewater
资金
- Helmholtz-Alberta Initiative (Theme 5) through the Alberta Environment and Parks' ecoTrust Program
- NSERC Senior Industrial Research Chair Program in Oil Sands Tailings Water Treatment
- Syncrude Canada Ltd.
- Suncor Energy Inc.
- Shell Canada
- Canadian Natural Resources Ltd.
- Total EP Canada Ltd.
- EPCOR Water Services
- IOWC Technologies Inc.
- Alberta Innovates - Energy and Environment Solution
- Meidensha Corporation
- Alberta Environment and Sustainable Resource Development
- Alberta Innovate Technology Futures (AITF) Graduate Scholarship
- Dr. Donald R. Stanley Graduate Scholarship
- China Scholarship Council (CSC) Award of Excellence
- Award of Distinction for Studying-Abroad Students from Xinjiang
Previously, anoxic-aerobic membrane bioreactor (MBR) coupled with mild ozonation pretreatment has been applied to remove toxic naphthenic acids (NAs) in oil sands process-affected water (OSPW). To further improve MBR performance, the optimal operation conditions including hydraulic retention time (HRT) and initial ammonia nitrogen (NH4+-N) need to be explored. In this study, the role of ozone pretreatment on MBR optimization was investigated. Compared with MBR treating raw OSPW, MBR treating ozonated OSPW had the same optimal operation conditions (HRT of 12 h and NH4+-N concentration of 25 mg/L). Nevertheless, MBR performance benefited from HRT adjustment more after ozone pretreatment. HRT adjustment resulted in NA removal in the range of 33-50% for the treatment of ozonated OSPW whereas NA removal for raw OSPW only fluctuated between 27% and 38%. Compared with the removal of classical NAs, the degradation of oxidized NAs was more sensitive to the adjustment of operation conditions. Adjusting HRT increased the removal of oxidized NAs in ozonated OSPW substantially (from 6% to 35%). It was also noticed that microbial communities in MBR treating ozonated OSPW were more responsive to the adjustment of operation conditions as indicated by the noticeable increase of Shannon index and extended genetic distances. (C) 2018 Elsevier B.V. All rights reserved.
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