title: Environmental Benefits and Burdens of Phosphorus Recovery from Municipal Wastewater.
abstract: The environmental benefits and burdens of phosphorus recovery in four centralized and two decentralized municipal wastewater systems were compared using life cycle assessment (LCA). In centralized systems, phosphorus recovered as struvite from the solids dewatering liquid resulted in an environmental benefit except for the terrestrial ecotoxicity and freshwater eutrophication impact categories, with power and chemical use offset by operational savings and avoided fertilizer production. Chemical-based phosphorus recovery, however, generally required more resources than were offset by avoided fertilizers, resulting in a net environmental burden. In decentralized systems, phosphorus recovery via urine source separation reduced the global warming and ozone depletion potentials but increased terrestrial ecotoxicity and salinization potentials due to application of untreated urine to land. Overall, mineral depletion and eutrophication are well-documented arguments for phosphorus recovery; however, phosphorus recovery does not necessarily present a net environmental benefit. While avoided fertilizer production does reduce potential impacts, phosphorus recovery does not necessarily offset the resources consumed in the process. LCA results indicate that selection of an appropriate phosphorus recovery method should consider both local conditions and other environmental impacts, including global warming, ozone depletion, toxicity, and salinization, in addition to eutrophication and mineral depletion impacts.
authors.affiliation: †School of Chemical Engineering, The University of New South Wales, Kensington 2052, Sydney, New South Wales, Australia.
authors.forename: Zenah
authors.initials: Z
authors.lastname: Bradford-Hartke
authors.affiliation: ‡School of Chemical Engineering, The University of Queensland, St. Lucia 4072, Brisbane, Queensland, Australia.
authors.forename: Joe
authors.initials: J
authors.lastname: Lane
authors.affiliation: ‡School of Chemical Engineering, The University of Queensland, St. Lucia 4072, Brisbane, Queensland, Australia.
authors.forename: Paul
authors.initials: P
authors.lastname: Lant
authors.affiliation: †School of Chemical Engineering, The University of New South Wales, Kensington 2052, Sydney, New South Wales, Australia.
authors.forename: Gregory
authors.initials: G
authors.lastname: Leslie
mesh_terms: D002947:Cities; D054750:Ecotoxicology; D004777:Environment; D005068:Eutrophication; D057232:Global Warming; D006801:Humans; D008903:Minerals / Q000032:analysis; D010084:Oxidation-Reduction; D010126:Ozone / Q000032:analysis; D052638:Particulate Matter / Q000032:analysis; D010758:Phosphorus / Q000302:isolation & purification*; D055668:Photochemical Processes; D054712:Salinity; D012623:Seawater / Q000737:chemistry; D062065:Wastewater / Q000737:chemistry*
chemical_list: D008903:Minerals; D010126:Ozone; D052638:Particulate Matter; D010758:Phosphorus; D062065:Wastewater