Comprehensive treatment method and device for ship exhaust gas pollutants and ballast water

The invention discloses a comprehensive treatment method and device for ship exhaust gas pollutants and ballast water. The device comprises a water pump I, a chlorine-containing oxidant tank, a lye tank, a fresh water tank, a water pump VI, a seawater pipe, a hydrocyclone, a sludge tank, a water pump V, a main washing liquid pipe, a water pump II, a water tank, a waste liquid storage tank, a ballast water chamber, a water pump III, a main spray pipe, a water pump IV, a stirrer, a washing tower, a cooler, a waste liquid discharge pipe, a stop valve I, a stop valve II, a stop valve III, a three-way valve and a stop valve IV. The ship exhaust gas pollutant treatment system provided by the invention adopts a wet washing technology, has two different operation modes, i.e. separate desulfurization and simultaneous desulfurization and denitrification, wherein the separate desulfurization mode can employ closed and open wet washing ways. According to different emission requirements of ship navigation areas to exhaust