PERFORMANCE OF THE ACTIVATED SLUDGE PROCESS – Statistical modelling
The performance of activated sludge treatment plants is usually influenced by input loads as well as by variations in biological and operational factors related to the treatment process. This implies that the assumption that steady-state conditions exist, is seldom true in practice. Conscientious control programs should be preceded by extensive plant studies concerning the variations of influent water as well as the characteristics of the treatment systems. Simple statistical analysis may further increase the knowledge of treatment processes and help to describe the variations involved. Specific examples are presented and discussed.