n the step-feed anoxic/oxic (A/O) process

influent flow distribution ratio is a crucial control parameter

which promises steady operation of the system and dominates this processThree different influent flow distribution methods proposed in this paper include: (i) same F/M ratio to nitrifiers; (ii) optimal coefficient and (iii) voluminous influent at the end of systemBased on the distribution methods presented above

a technically feasible and economically favorable expert control system of flow distribution was established on the basis of the data obtained from a pilot-scale domestic wastewater treatment systemThe related information from literature and the knowledge of human experts acquired through years of experience were also incorporatedThe suggested influent flow distribution method defined by expert system is directly decided by influent loading and raw wastewater characteristics

as well as effluent qualityFinally

the application of this expert system was illustrated by using one day’s data from a real plant

which represents the typical changes of influent flows and wastewater characteristics.