INTERMITTENT AERATION TYPE SEPTIC TANK

摘要

PURPOSE:To provide an intermittent aeration type septic tank which exhibits high and stable denitrification performance to fluctuation of loading and is energy saving and is easy for maintenance. CONSTITUTION:In an intermittent aeration type septic tank 1 wherein a partition wall 2 is formed in the central part of the aeration tank and a plurality of mechanical aeration apparatus 3 are installed in the tank, at least two mechanical aeration apparatus 3 are arranged on a diagonal line of the aeration tank and the numbers of rotation of at least two motors for the aeration apparatus 3 are intermittently repeated to perform high speed rotational driving and low speed rotational driving simultaneously by controlling both concn. of dissolved oxygen in the aeration tank and timer 5.