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Static decontamination of oil-based drill cuttings with pressurized hot water using response surface methodology
- Source :
- Environmental Science and Pollution Research. 26:7216-7227
- Publication Year :
- 2019
- Publisher :
- Springer Science and Business Media LLC, 2019.
-
Abstract
- Separating organic pollutants from oil-based drill cuttings (OBDC) is the current trend for its safe disposal. In this study, pressurized hot water extraction (PHWE) was adapted to decontaminate OBDC for the first time. 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. 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. The results suggested that temperature is the dominant parameter, followed by water volume and extraction time. Interactive effects among the three parameters are present in the PHWE of OBDC-A but absent in the PHWE of OBDC-B. The suitable conditions for the effective PHWE of OBDC-A were found to be a temperature of 284-300 °C, water volume of 15-35 ml, and extraction time of 20-60 min. The corresponding conditions were 237-300 °C, 15-35 ml, and 20-60 min for the PHWE of OBDC-B. These different phenomena are caused by the different characteristics of the two OBDC samples. All of the polynomial models obtained from the RSM experiments are very valid and can adequately describe the relationship among the three independent operating parameters and responses. The experimental results also confirmed that PHWE is a more efficient separation technique for decontaminating OBDC than single organic solvent extraction or low-temperature thermal desorption because PHWE integrates the advantages of both these processes.
- Subjects :
- Hot Temperature
Central composite design
Health, Toxicology and Mutagenesis
Extraction (chemistry)
Oil and Gas Industry
Water
Drill cuttings
General Medicine
010501 environmental sciences
Pulp and paper industry
01 natural sciences
Pollution
Autoclave
Hot water extraction
Diesel fuel
White oil
Solvents
Environmental Chemistry
Environmental science
Environmental Pollutants
Response surface methodology
Decontamination
Environmental Restoration and Remediation
0105 earth and related environmental sciences
Subjects
Details
- ISSN :
- 16147499 and 09441344
- Volume :
- 26
- Database :
- OpenAIRE
- Journal :
- Environmental Science and Pollution Research
- Accession number :
- edsair.doi.dedup.....e53ec504b5dc357f68433450011f1d92