NOVELTY - Raw corn is soaked, crushed and wet byproduct is dried to obtain secondary steam material and high-temperature condensate. Resultant high-temperature steam and secondary steam material are mixed, and condensate is further separated. Steam portion for corn syrup, is concentrated-preheated, and organic wastewater is subjected to anaerobic reactor, to produce biogas. Unreacted organic waste is used for supplementary reaction and water discharged after supplementary reaction is subjected to aerobic nitrification and denitrification, and discharged water is used for re-production.    USE - Recovery of secondary steam produced during corn starch wet milling (claimed).    ADVANTAGE - The method efficiently recovers secondary steam produced during corn starch wet milling, by simple method with reduced consumption of energy. Also, organic wastewater treatment is carried out with reduced consumption of energy.    DETAILED DESCRIPTION - Raw corn is soaked, crushed, and wet byproduct is isolated. The resultant wet byproduct is added to drying tubes, dried and secondary steam material and high-temperature condensate are generated. The high-temperature condensate is injected into condensate collector which conduct a separator, and several cycles of spraying is carried out in the condensate recovery separator, until high-temperature steam and cold condensate temperature decreases. The cold condensate as process water enters the water cycle. The resultant high-temperature steam and secondary steam material are mixed, and the condensate is further subjected to separator. The steam portion for corn syrup, is concentrated-preheated, and the organic wastewater is discharged into conditioning tank, and pH is adjusted to 7.5-9. The resultant organic wastewater is subjected to anaerobic reactor, to produce biogas. The unreacted organic waste is further used for supplementary reactions, and pH is adjusted to 6.3-6.8. Water discharged after supplementary reaction is simultaneously subjected to aerobic nitrification and denitrification method, and discharged water is used for re-production.