Fossil resource scarcity corresponds to the amount of fossil energy used for various operations during the process. Net fossil oil scarcity was reported in a unit of g oil Eq. The fossil oil scarcity ranged between -36 to 313 g oil Eq. based on the scenario adopted. Bisinella de Faria et al., (2015) reported a fossil oil depletion in the range of 120-130 g oil Eq., when urine from WW was separated and used for nutrient recovery as struvite. Figure represents the characterization of the major impact categories such as a) ozone formation-human health, b) fine particulate matter formation, c) ozone formation-terrestrial ecosystems, d) terrestrial acidification, e) freshwater ecotoxicity, f) marine ecotoxicity, g) human carcinogenic toxicity, and h) human non carcinogenic toxicity for the five scenarios.