A study of natural attenuation processes involved in a microcosm model of a crude oil-impacted wetland sediment in the Niger Delta.

Abstract:

:Sediment sample from a previously impacted Ochani stream was recreated in four glass chambers (A-D) as microcosms. The aim was to model and compare natural attenuation processes to forced aeration for remediation of a crude oil-impacted ecosystem. The initial hydrocarbon concentration was 90,212 mg/kg of sediment. After 60 days, the natural attenuation processes of photooxidation, evaporation, volatilization and biodegradation accounted for 31.9% of the total hydrocarbon removed while 13% was attributable to forced aeration, bringing the cumulative hydrocarbon removed to 44.9%. Photooxidation, evaporation and volatilization accounted for 15.6% of the total hydrocarbon removed. Biodegradation alone accounted for 24.7% removal. Gas chromatographic tracings showed appreciable reductions in peak heights and base. Hydrocarbon utilizing bacteria genera isolated included Pseudomonas, Micrococcus, Flavobacterium, Staphylococcus, Serratia, Bacillus, Chromobacterium, and Alkaligenes. Temperature was mesophilic (26-31 degrees C), while the pH tended towards acidity. The study revealed the applicability and the effectiveness of natural attenuation and forced aeration in the remediation of oil-impacted sediment in a typical Niger Delta setting.

journal_name

Bioresour Technol

journal_title

Bioresource technology

authors

Abu GO,Dike PO

doi

10.1016/j.biortech.2007.09.063

subject

Has Abstract

pub_date

2008-07-01 00:00:00

pages

4761-7

issue

11

eissn

0960-8524

issn

1873-2976

pii

S0960-8524(07)00810-3

journal_volume

99

pub_type

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