Effects of hourly load variation on treatment characteristics in anaerobic-aerobic activated sludge process

The effect of hourly load change on the treatment characteristics in an ana erobic-aerobic activated sludge process was compared for two types of varia tion. When the variation of wastewater concentration or flow rate was appli ed to the treatment unit according to normal distribution function like eff luent pattern in actual life, the treatment system gave relatively stable a nd successful removal of nitrogen and phosphorus compounds. When the mass f low rate of nitrogen applied to the treatment unit was equal, the performan ce of the present process was almost same regardless of load variation mode . The simulation of treatment behavior was carried out successfully by usin g the kinetic equations for sludge flee and the reactor models which consid ered the treatment unit as a completely mixed tank.