Performance Evaluation of a Common Effluent Treatment Plant (CETP): Reliability Analysis and Removal Efficiency Assessment

It is important to have a common wastewater treatment facility to treat the effluent coming out of numerous units because many small and medium-sized businesses cannot afford to have their own effluent treatment facilities. One such CETP has been established in Rajkot district, Gujarat for a textile manufacturing cluster, to treat wastewater at a common treatment facility. This study aims to evaluate the CETP's removal efficiency by utilizing the data received from the GPCB website. CETP’s treatment efficiency in terms of pollutant removal was assessed using data collected over 6 years period. An established methodology known as reliability analysis was used to assess the mean concentration required to achieve the confidence level at different ranges. In addition, the observed level of confidence in the CETP's operation was determined. The primary water quality indicators, which include pH, Biological Oxygen Demand (BOD), Chemical Oxygen Demand (COD), Total Suspended Solids (TSS), Ammoniacal Nitrogen (NH3-N), and Phenolic compounds, were utilized to evaluate the CETP performance. Overall, the CETP showed good treatment efficiency and reliability with discharge standards. It was noted that CETP failed to control suspended particles in the effluent, which can be related to the poor performance of the clariflocculator and secondary clarifier.