Amendments evaluated included native soil as a bulking agent and as a source of inoculum, rice hulls as a bulking agent to improve aeration and moisture retention, and urea as a source of nitrogen fertilizer. Soil was collected from a drilling site in Southeast Asia and soil microcosms were incubated in a sealed and controlled environment to mimic the dry season of the field site. In this study biological treatment of drill cutting wastes containing Saraline® (synthetic paraffin mineral oil) was examined using a variety of amendments to study the effect of different conditions on the biodegradability of synthetic drill cutting wastes. Biological treatment is an effective means of disposing of drill cutting wastes, but proper biodegradation conditions are critical. Drill cutting waste includes synthetic drilling fluids typically consisting of petroleum-based compounds mixed with clay-type materials and water. Oil and gas drilling operations create drill cutting wastes around the world.
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