The condensed water treatment system for an internal combustion engine

Condensate processing apparatus acquires the water volume of the condensed water tank (Qw) (S1), water content (Qw) is greater than the threshold value (tu), and the urea water for selective reduction of NOx catalyst exhaust if it is supplied to the passage (S2), to drain the condensed water in the condensed water tank to the exhaust passage (S4). Thus, the condensed water is drained to the outside of the internal combustion engine through the exhaust passage after it is neutralized.