High-concentration emulsified oily wastewater is difficult to treat due to its high interfacial stability and complex composition. Herein, a sequential coagulation-adsorption process (CAP) integrating PAC, wood-based activated carbon (WAC), and 15-million-molecular-weight anionic polyacrylamide (15APAM) was developed for simulated and real oily wastewater treatment. Process parameters were optimized via response surface methodology (RSM), and the coupling mechanism was elucidated using ζ-potential, floc size evolution, adsorption kinetics/thermodynamics, fluorescence spectroscopy, and molecular dynamics (MD) simulation. Under optimized conditions (45 °C, pH 7, 5.2 min; PAC 30 mg·L-1, WAC 0.75 g·L-1, 15APAM 6 mg·L-1), CAP achieved 98.73% COD, 99.38% oil, 99.35% turbidity, and 71.34% NH3-N removal in simulated wastewater, with only 0.02-0.07% deviation between experimental and model-predicted COD removal. Compared with PAC-15APAM (PA) system, CAP produced larger shear-resistant flocs (max 504 μm, Sf = 24.6%, Rf = 93.4%). Adsorption followed pseudo-second-order model (R2 = 0.999), with PAC pretreatment doubling equilibrium adsorption capacity (323.44-660.85 mg·g-1), and thermodynamic analysis indicated that the adsorption was spontaneous and exothermic, with ΔHo = -34.07 kJ·mol-1. For real wastewater at pH 4, CAP achieved 80.12% COD and 85.32% NH3-N removal, validating it as an efficient, reliable strategy for high-concentration emulsified oily wastewater remediation.
Liu et al. (Sun,) studied this question.
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