Biological treatment of PAH-contaminated sediments in a Sequencing Batch Reactor.
The technical feasibility of a sequential batch process for the biological treatment of sediments contaminated by polycyclic aromatic hydrocarbons (PAHs) was evaluated through an experimental study. A bench-scale Sediment Slurry Sequencing Batch Reactor (SS-SBR) was fed with river sediments contaminated by a PAH mixture made by fluorene, anthracene, pyrene and crysene. The process performance was evaluated under different operating conditions, obtained by modifying the influent organic load, the feed composition and the hydraulic residence time. Measurements of the Oxygen Uptake Rates (OURs) provided useful insights on the biological kinetics occurring in the SS-SBR, suggesting the minimum applied cycle time-length of 7 days could be eventually halved, as also confirmed by the trend observed in the volatile solid and total organic carbon data. The removal efficiencies gradually improved during the SS-SBR operation, achieving at the end of the study rather constant removal rates above 80% for both 3-rings PAHs (fluorene and anthracene) and 4-ring PAHs (pyrene and crysene) for an inlet total PAH concentration of 70 mg/kg as dry weight (dw).
Chiavola
Agostina
A
Department of Hydraulics, Transportation and Roads, Faculty of Engineering, University of Rome Sapienza, Via Eudossiana, 18, Zip code 00184, Rome, Italy. Electronic address: agostina.chiavola@uniroma1.it.
Baciocchi
Renato
R
Department of Civil Engineering, Faculty of Engineering, University of Rome Tor Vergata, Via del Politecnico 1, Zip code 00133, Rome, Italy. Electronic address: baciocchi@ing.uniroma2.it.
Gavasci
Renato
R
Department of Civil Engineering, Faculty of Engineering, University of Rome Tor Vergata, Via del Politecnico 1, Zip code 00133, Rome, Italy. Electronic address: gavasci@ing.uniroma2.it.
D019149:Bioreactors; D019015:Geologic Sediments / Q000737:chemistry*; D010100:Oxygen / Q000032:analysis; D011083:Polycyclic Compounds / Q000032:analysis*
D011083:Polycyclic Compounds; D010100:Oxygen