Tertiary treatment using ultrafiltration in an existing sewage treatment plant for industrial reuse - a modelling approach using an artificial neural network with uncertainty estimation

Navi Mumbai Municipal Corporation of Maharashtra state, India, unified a tertiary treatment plant (TTP) of 20 million litres per day (MLD) capacity with ultrafiltration technology in an existing Koparkhairane sewage treatment plant (STP) for producing effluent quality usable for industrial purposes. As prior art, an artificial neural network-genetic algorithm (ANN-GA) along with uncertainty estimation using prediction interval is employed to model secondary treated effluent (STE) flow rate (Q(T)) and other quality parameters, such as biochemical oxygen demand, chemical oxygen demand and total suspended solids (TSS) to conclude the reliability of the range in which the input is available to TTP. ANN-GA model provides a coefficient of determination above 0.90 for all STE parameters modelled other than TSS. Inferring that a good quantity and quality of 20 MLD STP treated water is currently available, where a decreasing trend of Q(T) is also noticed and highlighted. Further, the Wilcoxon signed-rank test on the quality parameter of effluent TTP for industrial reuse standard infers that TSS shows infringement during the initial period but started adhering to standards over time. The research delineates at the outset of exploring water reuse policy in India, emphasizing Maharashtra state, modelling STE using ANN-GA and performance evaluation of TTP.