OXIDATION DITCH TREATMENT IN ACTIVATED SLUDGE METHOD

摘要

PROBLEM TO BE SOLVED: To provide an oxidation ditch treatment method in an activated sludge method in which energy conservation is achieved by preventing increase of power consumption caused by excess operation of a return sludge pump and reduction in water quality of treated water is prevented by preventing sludge from being precipitated and accumulated in a ditch during the time when transfer of raw water from a flow rate regulation tank to the ditch is interrupted, and avoiding reduction of activity due to solution of activated sludge. SOLUTION: Surface aeration-agitators 6 and a return sludge pump 10 are operated by interlocking to operation of a flow rate regulation pump 2 provided in a flow rate regulation tank 1. Operation of the return sludge pump 10 is stopped at time of stopping of operation of the flow rate regulation pump 2 and thereby excess operation of the return sludge pump 10 is prevented. Also, sludge is prevented from being precipitated and accumulated in a ditch 5 by intermittently operating the surface aeration-agitators 6.