Biological Treatment Of Petroleum
Contaminated Soils By Soil Slurry-sequencing
Batch Reactors (SS-SBRs)
Author(s)
B. Torabifar, A. Torabian, A. A. Azimi & M. Vossoughi
Abstract
The soil slurry-sequencing bath reactor (SS-SBR) was studied to treat poorly
graded sand with clay (SP-SC) contaminated by aged petroleum hydrocarbons
and polycyclic aromatic hydrocarbons (PAHs) with concentrations of 23000
mg/kg and 750 mg/kg respectively. An 8 L bioreactor was operated with a 10%
solid concentration (0.1 kg dry soil/L slurry). The fill period was relatively
instantaneous, and the draw period lasted approximately 1 minute so the react
period comprised essentially the entire cycle time. In the draw period a fraction
of slurry (10%) was removed from the SS-SBR weekly and it was replaced with
untreated slurry. This volumetric replacement strategy provided 70 days
hydraulic retention time (HRT). The process performance was assessed by
monitoring total petroleum hydrocarbons (TPH) and PAH concentrations, pH,
dissolved oxygen (DO), oxygen uptake rate (OUR) and colony forming units
(CFU). Due to a high concentration of TPH, silica gel clean up was performed to
specify PAH degradation. The results have shown high overall removal
efficiency for TPH close to 97% whereas biodegradation of PAHs has been
performed with a removal efficiency of 90%.
Keywords: petroleum contaminated soils, bioslurry, SS-SBR, TPH, PAH.
1 Introduction
For many years the soils of Azimabad, in the vicinity of the Tehran refinery
plant, have been contaminated with petroleum hydrocarbons through spills,
leakage of oil reservoirs, decay pipelines and refinery wastes. The intensity of
Keywords
petroleum contaminated soils, bioslurry, SS-SBR, TPH, PAH.
Related Book
Other papers in this volume
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