Acute effect of benzo[a]anthracene on the biodegradation of peptone under aerobic conditions

作者：Basak Serden; Cokgor Emine Ubay^*; Insel Guclu; Orhon Derin

来源：Environmental Science and Pollution Research, 2012, 19(8): 3412-3420.

DOI：10.1007/s11356-012-0866-4

• Benzo[a]anthracene
• Polycyclic aromatic hydrocarbons
• Biodegradation
• Inhibition
• Modeling
• Oxygen uptake rate
• Polyhydroxyalkanoates
• Xenobiotics

This study investigated the acute effect of benzo[a]anthracene, a significant compound among polycyclic aromatic hydrocarbons, on the biodegradation of a synthetic organic substrate-a peptone/meat extract mixture-under aerobic conditions. %26lt;br%26gt;A laboratory-scale sequencing batch reactor was sustained at steady state at a sludge age of 10 days with substrate feeding. Inhibition tests involved running a series of batch reactors initially seeded with the biomass obtained from the parent reactor. After the biomass seeding, the reactors were started with the peptone mixture and a range of initial benzo[a]anthracene concentrations between 0.5 and 88 mg/L. Experimental profiles of oxygen uptake rates and polyhydroxyalkanoates were evaluated by calibration of a selected model. %26lt;br%26gt;Lower doses of benzo[a]anthracene had no effect on process kinetics. The noticeable acute impact was only observed with the addition of 88 mg/L of benzo[a]anthracene, but it was limited with the storage mechanism: the amount of organic substrate diverted to polyhydroxyalkanoates was significantly reduced with a corresponding decrease in the maximum storage rate, k (STO), from 2.7 down to 0.6 day(-1). Similarly, the maximum growth rate from internally stored polyhydroxyalkanoates was lowered from 2.3 to 1.0 day(-1). %26lt;br%26gt;Among the mechanisms for direct substrate utilization, only the hydrolysis rate was slightly reduced, but otherwise, the overall COD removal efficiency was not affected.

• 出版日期2012-9