The goal and scope of this study is to assess the environmental impacts of sewage treatment plant (STP) and four different nutrient recovery systems. The International Organization for Standardization (ISO) had established a standardized methodology for conducting LCAs that involves four steps: the definition of a goal and scope, inventory analysis, impact assessment, and interpretation of result . All four steps have been considered in this study, where cradle-to-gate approach was used to carry out LCA. The functional unit used to assess the environmental impacts was 1-m 3 of WW treated/day for 365days operating period.