The complex wastewater treatment system of the present invention comprises a water collecting tank (20) for collecting and storing wastewater, a first digester (30) for primarily treating wastewater transferred from the water collecting tank, and a first A second digester 40 for secondarily treating the treated wastewater, and a settling tank 110 for discharging the treated water treated in the second digester. In addition, when the first and second digestion tanks are operated as an anaerobic digestion system, an external blower (230, 240) for selectively supplying air into the first digestion tank and the second digestion tank, and a gas collecting device 210 ). In the wastewater treatment system of the present invention, both the first digestion tank and the second digestion tank can be operated as a high-temperature aerobic digestion system, they can be operated as an anaerobic digestion system, and the first digester can be operated as a second The digester can be operated as an anaerobic digestion system or vice versa. The present invention is easier to maintain than a wastewater installed in a digester and can easily process a mechanical configuration in a small scale digester.
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