Co-treatment of an oily sludge and aged contaminated soil: permanganate oxidation followed by bioremediation

ROSSO, JANINA A.; MORELLI, IRMA S.; MORA, VERÓNICA C.

JOURNAL OF ENVIRONMENTAL MANAGEMENT

ACADEMIC PRESS LTD-ELSEVIER SCIENCE LTD

Lugar: Amsterdam; Año: 2020 vol. 261

0301-4797

The bioremediation of an oily sludge (321 � 30 mg of polycyclic aromatic hydrocarbons/kgDRY SLUDGE and13420 � 1300 mg of aliphatic hydrocarbons/kgDRY SLUDGE) by mixture with contaminated soil (23 � 2 mg ofpolycyclic aromatic hydrocarbons/kgDRY SOIL and 98 � 10 mg of aliphatic hydrocarbons/kgDRY SOIL) was studied.Furthermore, the effect of oxidative pretreatments (persulfate and permanganate) on the performance of theglobal process was examined.The treatments reached contamination levels lower than the original residues, indicating the presence ofsynergic processes between a highly contaminated sludge and soil with a selected hydrocarbon-degradingcommunity.Pretreatment with permanganate significantly improved biodegradation, possibly due to the increase inbioavailability and biodegradability of petroleum hydrocarbons. Two months of incubation was enough to reachthe complete elimination of polycyclic aromatic hydrocarbons and 92% elimination of aliphatic hydrocarbons.Monitoring using five parameters (concentration of total petroleum hydrocarbons, total cultivable heterotrophicbacteria count, lipase and dehydrogenase activities, and polycyclic aromatic hydrocarbon-degrading bacteriacount) as an approach for a preliminary scanning of the effectiveness of a treatment is proposed based onprincipal components analysis.