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Human health risk assessment of volatile organic compounds in oil-based drill cuttings of shale gas

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Abstract

Waste oil-based drill cuttings contain dioxins and volatile organic compounds (VOCs), which have the potential to cause serious health effects in humans. Therefore, this paper took oil-based drill cuttings (OBDCs) as the research object and carried out the testing of VOCs and dioxins content by using GC–MS and HRGCS-HRMS and comprehensively evaluated the content, composition and distribution pattern of VOCs and dioxins and the risk to human health posed by the two pollutants in OBDCs. The results showed that the VOCs did not exceed the emission limits in ESPPI (GB 31571–2015), but it is vital to recognise that 1,2-dichloropropane has the potential to cause cancer risk, with soil and groundwater risk control values of 662.95 mg·kg−1 and 0.066 mg·kg−1, respectively. Benzene, 1,2-dichloropropane and 8 other VOCs pose a non-carcinogenic risk to humans. The levels of polychlorinated dibenzofurans (PCDFs) exceeded those of polychlorinated dibenzo-p-dioxins (PCDDs), which accounted for 95.76 percent of the total PCDD/Fs, 2,3,4,7,8-P5CDF (56.00%), 2,3,7,8-T4CDF (9.20%), 1,2,3,6,7,8-H6CDF (8.80%) and 1,2,3,7,8-P5CDF (8.00%) were the main contributing monomers. The findings of the assessment on exposure risk indicate that there is a respiratory risk to oil-based drill cuttings dioxins for adults and children exceeded the World Health Organisation (WHO) acceptable daily intake (ADI) (1–4 pgTEQ/kg/d). Finally, three aspects of solid waste pre-treatment prior to incineration, the incineration process and post incineration were used to reduce the environmental and human health risks from dioxins.

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Data availability

All data generated or analysed during this study are included in this published article.

Abbreviations

VOCs:

Volatile organic compounds

OBDCs:

Oil-based drill cuttings

ESPPI:

Emission standards for pollutants in the petrochemical industry

PCDFs:

Polychlorinated dibenzofurans

PCDDs:

Polychlorinated dibenzo-p-dioxins

WHO:

World Health Organisation

ADI:

Acceptable daily intake

GC-MS:

Gas chromatography-mass spectrometry

HRGCS-HRMS:

High-resolution gas chromatography-high resolution mass spectrometry

USEPA:

The United States Environmental Protection Agency

HI:

Hazard index

ILCR:

Lifetime cancer risk

EB:

Ethylbenzene

MX:

M-Xylene

OX:

O-Xylene

IPB:

Isopropylbenzene

1,3,5-TMB:

1,3,5-Trimethylbenzene

1,2-DCP:

1,2-Dichloropropane

DCM:

Dichloromethane

PhH:

Benzene

PhMe:

Toluene

PERC:

Tetrachloroethylene

MCB:

Chlorobenzene

EB:

Ethylbenzene

2,3,7,8-T4CDF:

2,3,7,8-Tetrachlorodibenzofuran

1,2,3,7,8-P5CDF:

1,2,3,7,8-Pentachlorodibenzofuran

2,3,4,7,8-P5CDF:

2,3,4,7,8-Pentachlorodibenzofuran

1,2,3,4,7,8-H6CDF:

1,2,3,4,7,8-Hexachlorodibenzofuran

2,3,4,6,7,8-H6CDF:

2,3,4,6,7,8-Hexachlorodibenzofuran

1,2,3,7,8,9-H6CDF:

1,2,3,7,8,9-Hexachlorodibenzofuran

1,2,3,4,6,7,8-H7CDF:

1,2,3,4,6,7,8-Heptachlorodibenzofuran

1,2,3,4,7,8,9-H7CDF:

1,2,3,4,7,8,9-Heptachlorodibenzofuran

O8CDF:

Octachlorodibenzofuran

2,3,7,8-T4CDD:

2,3,7,8-Tetrachlorodibenzo-p-dioxins

1,2,3,7,8-P5CDD:

1,2,3,7,8-Pentachlorodibenzo-p-dioxins

1,2,3,4,7,8-H6CDD:

1,2,3,4,7,8-Hexachlorodibenzo-p-dioxins

1,2,3,6,7,8-H6CDD:

1,2,3,6,7,8-Hexachlorodibenzo-p-dioxins

1,2,3,7,8,9-H6CDD:

1,2,3,7,8,9-Hexachlorodibenzo-p-dioxins

1,2,3,4,6,7,8-H7CDD:

1,2,3,4,7,8,9-Heptachlorodibenzo-p-dioxins

O8CDD:

Octachlorodibenzo-p-dioxin

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Funding

This study was funded by science and technology research project of Chongqing Municipal Education Commission of China (KJQN202100723), Open Project of State Key Laboratory of Solid Waste Reuse for Building Materials (SWR-2023–003) and Key Special Project of Technology Innovation and Application Development of Chongqing, China (CSTB2023TIAD-KPX0074).

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Chao-qiang Wang mainly contribute to material preparation, manuscript preparation and manuscript editing and revision mainly. Yan Ying contribute to study design, experimental studies, data analysis and manuscript editing and revision. Xu-dong Mei mainly contribute to manuscript editing and experimental design. Feng-lin Xu mainly contribute to manuscript editing and experimental design. Zhong Chen mainly contribute to manuscript editing and experimental design. All authors read and approved the final manuscript.

Corresponding author

Correspondence to Chao-qiang Wang.

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This study does not contain any studies with human participants and/or animals.

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The authors declare no competing interests.

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Wang, Cq., Ying, Y., Mei, Xd. et al. Human health risk assessment of volatile organic compounds in oil-based drill cuttings of shale gas. Environ Sci Pollut Res 31, 16092–16105 (2024). https://doi.org/10.1007/s11356-024-32322-0

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