Fig. 3

Produced water samples immediately after adding surfactant at the concentration of (a) 0.024 g/mL, (b) 0.015 g/mL, and (c) 0.006 g/mL at room temperature.

Produced water samples immediately after adding surfactant at the concentration of (a) 0.024 g/mL, (b) 0.015 g/mL, and (c) 0.006 g/mL at room temperature.