• • SDS-Na2SiO3 composite microemulsion achieved 92.47% oil removal efficiency, outperforming single-surfactant systems (86.33% for SDS, 87.45% for AOS), demonstrating enhanced performance for hazardous waste remediation.
• • Optimal single-surfactant formulations were determined: SDS microemulsion (SDS:alcohol:NaCl = 2.72%:13.21%:2.17%) and AOS microemulsion (SDS:alcohol:NaCl = 2.72%:15.41%:2.17%), providing precise formulation guidelines for industrial application.
• • The composite microemulsion could be recycled up to 5 times while meeting national secondary utilization standards, indicating significant cost reduction potential for large-scale operations.
• • AOS-Na2SiO3 composite exhibited superior salt resistance, whereas SDS-Na2SiO3 showed better alcohol resistance, enabling tailored selection based on specific field conditions (e.g., salinity, cosurfactant availability).