Semi-continuous treatment of naphthenic acids using aerobic granular sludge

• Published in: Bioresource technology reports 2018-09, Vol.3, p.191-199
• Main Authors: Tiwari, S.S., Iorhemen, O.T., Tay, J.H.
• Format: Article
• Language: English
• Subjects: Aerobic granular sludge; Industrial wastewater treatment; Naphthenic acids (NAs); Oil sands process-affected water (OSPW)
• ISSN: 2589-014X; 2589-014X
• DOI: 10.1016/j.biteb.2018.08.007

Process-affected water from the Canadian oil sands industry contains long chain cycloalkane carboxylic acids called naphthenic acids (NAs). The present proof-of-concept study aimed at assessing the shock response and treatability of commercial NAs using aerobic granular sludge (AGS) over 21 days. Mature aerobic granules were cultivated in a 5 L sequencing batch reactor (SBR) using synthetic acetate-based wastewater, and subjected to the NA mixture in three stages with varying organic loading rates. The introduction, starvation and the monitoring phases each had COD (chemical oxygen demand) removal efficiencies of 54.8%, 23.9% and 96.1%, and NA removal efficiencies of 71.8%, 43.3% and 67.0%, respectively. AGS biomass concentrations requiring higher COD consumption, and AGS surface area facilitating biodegradation and biosorption produced high specific removal rates. Specific COD removal rates ranged between 2678 and 6864 g COD/m3/d, whereas specific NA removal rates ranged between 0.5 and 12.2 g NA/m3/d. Supplemental nutrients were also degraded with over 90% removal efficiencies. •Biodegradation of commercial NAs was studied over 21 days using AGS.•Steady-state COD and NA removal efficiencies were 96.1% and 67.0%, respectively.•Specific COD removal rates ranged between 2678 and 6864 g COD/m3/d.•Specific NA removal rates ranged between 0.5 and 12.2 g NA/m3/d.•Biosorption and biodegradation were major mechanisms of NA removal.