HIGH STRENGTH NITROGEN REMOVAL FROM NIGHTSOIL AND PIGGERY WASTES

The study evaluated the nitrogen removal characteristics with the existing and modified nightsoil and piggery waste treatment plants. A combined treament with anaerobic digestion with the adjustment of influent bypass rates was proposed to reduce the reactor temperature and the external carbon requirement. The biological treatment could discharge about 1.1 mg/l soluble COD and 50 mg/l soluble nitrogen respectively.