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May 29, 2026ToxicsOpen Access

Regional Variations in Physicochemical Properties and Oil–Solid Interaction Mechanisms of Oily Sludge from Three Chinese Oilfields

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Systematic evaluation of oily sludge characteristics in three Chinese oilfields, revealing effective treatments for resource recovery.

This study aims to analyze the variations in physicochemical properties and oil–solid interactions of oily sludge from different Chinese oilfields.
Integrated analyses of elemental composition, oil composition, X-ray diffractometer (XRD), Fourier-transform infrared (FT-IR), Gas chromatography (GC), and Confocal laser scanning microscope (CLSM).
Application of a novel high-speed stirring cleaning method to evaluate oil removal efficiency under ambient conditions.
Residual oil contents after treatment were 4.43% (PJ-OS), 1.65% (DQ-OS), and 1.22% (XJ-OS) with removal efficiencies of 80.86%, 86.74%, and 90.33%, respectively.
Panjin oil sludge showed the lowest oil mobility and recovery potential due to high oxidation and compact structures.
The treatability of oily sludge was strongly influenced by its intrinsic physicochemical properties, with higher O/C ratios leading to increased oil–solid adhesion.

Bao et al. (2026) studied this question.

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