Device and method for treating ship sewage through ultrasonic strengthening internal electrolysis coupling biological method

The invention provides a device and method for treating ship sewage through an ultrasonic strengthening internal electrolysis coupling biological method. Ship sanitary sewage in a raw water tank enters a catalytic iron internal electrolysis column through a peristaltic pump, an ultrasonic vibration bar mounted in the catalytic iron internal electrolysis column emits ultrasonic waves to strengthen an internal electrolysis reaction, the sewage subjected to the ultrasonic strengthening internal electrolysis reaction enters an aeration tank, pollutants in the sewage are further treated through activated sludge in an MBR, a time relay controls an aeration pump to be started and stopped, and when the aeration pump runs, nitrobacteria in the aeration tank are subjected to an aerobiotic nitration reaction, and meanwhile a reverse suction pump carries out suction and water output; when the aeration pump is stopped, nitrogen removal by denitrification effect is achieved in the aeration tank, and the suction pump stops suction. According to the device and method, the requirement in a guide rule for the emission of nitrogen and phosphorus in the ship sanitary sewage can be effectively met, by means of the device, the space of a ship is saved, nitration liquid does not need to flow back, operation and management are convenient, and the device and method are suitable for being used for the ship.