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Interactive effects among the three parameters are present in the PHWE of OBDC-A but absent in the PHWE of OBDC-B. The results suggested that temperature is the dominant parameter, followed by water volume and extraction time. Response surface methodology (RSM) with a central composite design (CCD) was applied to investigate the effects and interactive effects of three independent operating parameters (temperature, extraction time, and water volume) and to ultimately optimize the PHWE process. Two typical OBDC samples, i.e., diesel-based drill cuttings (OBDC-A) and white oil-based drill cuttings (OBDC-B), were statically extracted in a homemade batch autoclave. In this study, pressurized hot water extraction (PHWE) was adapted to decontaminate OBDC for the first time. Separating organic pollutants from oil-based drill cuttings (OBDC) is the current trend for its safe disposal.
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