摘要
Anaerobic biotreatment of real field petroleum refinery oily sludge(PROS)was investigated under using four different organic loads(OLs)in the order ofOL4>OL3>OL2>OL1,in bench-scale bioreactors.The bioremediation of raw PROS was carried out using mixed culture biocatalyst without chemicals addition or any type of pretreatment.The results revealed a potential performance of the used biocatalyst dominated by Pseudomonas aeruginosa(class:Gammaproteo)and Staphylococcus spp.(class:Bacilli)achieving significant removal of chemical oxygen demand(COD)and total petroleum hydrocarbons(TPH).The highest organic removal rate was recorded in OL4 followed by OL3,0L2,OL1,respectively indicating a positive relationship between the percentage removal of organics and their content.Maximum removal efficiencies of 96.7%and 90%were observed for COD and TPH,respectively in OL4 within 14 days only.Analysis of polycyclic aromatic hydrocarbons(PAHs)demonstrated that acenaph-thylene and phenanthrene exhibited the maximum removal efficiency(almost complete)among the 8-priority PAHs tested in this study.However,the overall degradation of PAHs in the oily sludge was 83.3%.
