The wastewater treatment system 10 is a liquid container 26 provided under at least one of the first devices 13, and a temporary storage tank 47 connected to the liquid container through a conduit to temporarily collect liquid collected in the liquid container. Temporary storage tank (47) for storing as, a discharge conduit (52) connected to the temporary storage tank and provided with a first valve (55), a discharge conduit (52) for discharging the liquid stored in the temporary storage tank to the sea, and It has a contaminated water storage tank 58 connected to a temporary storage tank through a conduit with two valves 57.
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