Utilizing Clay Minerals for Efficient Treatment of Oilfield Wastewater

Summary Oilfield wastewater, constituting approximately 75% of global oil production, poses significant environmental and economic challenges due to its high pollutant content. Produced water accounts for 80% of waste in the oil and gas sector, incurring treatment costs of around $40 billion annually. Effective treatment is essential for regulatory compliance and environmental protection, particularly in mitigating harmful contaminants. This study investigates the potential of clay minerals, such as palygorskite, as adsorbents for removing oil and organic contaminants from oilfield produced water. Various clay samples were characterized for their mineralogical properties using techniques such as Fourier Transform Infrared Spectroscopy (FTIR), X-ray Diffraction (XRD), and Scanning Electron Microscopy (SEM). The oilfield wastewater exhibited a Total Organic Carbon (TOC) of 7940 ± 39 mg/L and an oil content of 496 mg/L. Notably, the local shale rock, rich in palygorskite, demonstrated a removal efficiency of 78.98%. The study highlights the effectiveness of natural clays and their composites in treating oilfield wastewater, paving the way for sustainable and cost-effective remediation solutions. Further exploration of modified clays could enhance sorption capacities, contributing to improved water treatment strategies in the oil and gas industry.