Oil-water mixture treatment device and method

An oil-water mixture treatment device (10), comprising a laminar separator (200) and an electric field separator (300) located downstream of said laminar separator,

• wherein said laminar separator (200) comprises a coalescing tube (210) with coalescing filler therein, a separating tube (220) arranged above said coalescing tube, and a discharging tube (230) arranged above said separating tube;
• wherein said coalescing tube, said separating tube and said discharging tube are arranged substantially parallel with and spaced apart from each other, said coalescing tube being connected to said separating tube by a first connecting tube group (240) and said separating tube being connected to said discharging tube by a second connecting tube group (260);
• and
• wherein, during operation, an oil-water mixture is treated in said coalescing tube, and then enters said separating tube through said first connecting tube group for laminar separation to form an oil phase and a water phase, and the oil phase enters into said discharging tube through said second connecting tube group and then is discharged from an upper portion of said discharging tube through an oil discharge pipeline (22), while the water phase enters into said electric field separator from a lower portion of said separating tube for a next stage of separation.