Adsorption and flotation in one step: A new method for treating petroleum wastewater

Area of Science:

• Environmental Science
• Chemical Engineering
• Materials Science

Background:

• Petroleum wastewater (PW) treatment is critical for economic and environmental sustainability in oil production.
• Existing methods often struggle with high salinity and complex organic pollutant mixtures.
• Process intensification technologies offer promising solutions for efficient PW remediation.

Purpose of the Study:

• To develop and evaluate a one-step adsorption and flotation technique for removing organic compounds from petroleum wastewater.
• To assess the efficacy of a novel biochar-derived composite in this combined treatment process.
• To compare the performance of the biochar composite with a commercial surfactant in PW treatment.

Main Methods:

• A biochar-derived composite was synthesized and utilized in a one-step combined adsorption and flotation process.
• The method was tested using both synthetic and real high-salinity petroleum wastewater samples from Brazilian oil wells.
• Performance was evaluated based on the removal efficiency of organic compounds, oil, and grease.

Main Results:

• The biochar composite demonstrated high efficiency in removing organic compounds from synthetic PW, outperforming a commercial surfactant.
• In real PW, the composite achieved up to 83.89% removal of oil and grease concentrations.
• The technique proved effective even in complex, high-salinity, and competitive wastewater environments.

Conclusions:

• The one-step adsorption and flotation using a biochar-derived composite is a highly efficient and viable technology for petroleum wastewater treatment.
• This method offers significant technical and environmental potential for managing produced water from oil extraction.
• The developed composite presents a promising alternative for sustainable and cost-effective PW remediation.