Abstract: In order to guide the treatment and reuse of fire sewage, two typical refined oils of diesel and gasoline and two micron solid powders of silica gel and silicon dioxide were selected to mix sewage with different mass fraction, and the influence of oil and solid content on foaming properties is tested. The experimental results show that when the mass fraction is 0~3%, diesel mainly affects the expansion ratio, with a decrease of 40.15%, gasoline mainly affects the 25% drainage time, with a decrease of 33.05%. Solid particles (Φ>10 µm) have an effect on both expansion ratio and 25% drainage time, with the former decreasing by 25.22% and the latter decreasing by 18.49%.

Key words: foam, oil mass fraction, solid mass fraction, drainage time, expansion ratio