Performance Evaluation of Nesapakkam Sewage Treatment Plant using STOAT Software

IJEP 42(10): 1263-1267 : Vol. 42 Issue. 10 (October 2022)

Rana Sen and A.R. Quaff*

National Institute of Technology, Department of Civil Engineering, Patna – 800 005, Bihar, India


In this study STOAT software has been applied to evaluate the performance of an activated sludge process (ASP) based sewage treatment plant (STP) located at Nesapakkam, Chennai based on total suspended solids (TSS) and biochemical oxygen demand (BOD5) concentrations in the effluent. This paper aims to evaluate effluent characteristics and then set-up a linear relationship between TSS and BOD5 removal efficiencies of the STP. The removal efficiencies of TSS and BOD5 were obtained as 89.64% and 93.13%, respectively. The linear regression equation that gives the relationships between TSS (x-axis) and BOD5 (y-axis) removal efficiencies was found to be y=0.5932x+39.942. This study work gives an overview for predicting output quality of existing sewage treatment plant.


STOAT, STP modelling, Total suspended solids, Biological oxygen demand, Efficiency evaluation


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