Generally, Sewage Treatment Plants(STPs) are complexes systems in which a range of physical,
chemical and biological processes occur. However, their performance strongly depends on the
know-how acquired by the field-engineer. Recently, in order to solve this situations, various
operation and management technologies based on the Instrumentation, Control and Automation(ICA)
have been developed. As a economies-environmental affect point of view, this study was for the
performance evaluation and assessment of results from the Smart Operation System(SOS) in fullscale
STP. The SOS in STP consisted of the process monitoring module, including real-time influent
prediction and effluent simulation, and the Smart Air Control(SAC) module. According to the
results from field test for 2 years, the results of economical evaluation, amount of benefits and cost
saving by the SOS have shown to be much higher than that of traditional operation. Nevertheless,
the removal load(kg/yr) of BOD 13.3 %, COD 28.2 %, TN 44.4 % and TP 20.8 % were increased,
respectively. Remarkable improvement of removal load could be achieved after the SOS was
adapted. It was concerned that the SOS offer a user friendly functionalities and cost saving needed
by the field-engineers. In addition, it was expected that the results of this study would supply
helpful information for design and cost saving for the SOS in full-scale STP.