Establishment and application of influent flow distribution expert system in step-feed A/O process
In 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.