NITROGEN/PHOSPHOR REMOVAL TREATMENT METHOD AND NITROGEN/PHOSPHOR REMOVAL TREATMENT APPARATUS

摘要

PROBLEM TO BE SOLVED: To provide a nitrogen/phosphor removal treatment apparatus and a nitrogen/phosphor removal treatment method, capable of efficiently removing nitrogen and phosphor from sewage and industrial waste water at low energy costs.;SOLUTION: Nitrogen compounds and phosphor compounds are detected from a gas phase and/or a liquid phase in an aerobic tank, wherein: (i) in a case of NH4-NNlim and PO4-P≤Plim, a DTA is subjected to high-speed mode driving so that the anaerobic cum aerobic tank is brought into an aerobic treatment atmosphere; (ii) in a case of NH4-N≤Nlim and PO4-PPlim, the DTA is subjected to low-speed mode driving so that the anaerobic cum aerobic tank is turned into an anaerobic treatment atmosphere; (iii) in a case of NH4-NNlim and PO4-PPlim, a sewage inflow amount is reduced or the DTA is switched to a low-speed mode or the driving is stopped; and (iv) in a case of NH4-N≤Nlim and PO4-P≤Plim, the DTA is subjected to the high-speed mode driving until the concentration of the nitrogen compounds becomes equal to a threshold or the concentration of the phosphor compounds becomes equal to a threshold.;COPYRIGHT: (C)2014,JPO&INPIT