title: Impact of an external electron acceptor on phosphorus mobility between water and sediments.
abstract: The present work assessed the impact of an external electron acceptor on phosphorus fluxes between water and sediment interface. Microcosm experiments simulating a sediment microbial fuel cell (SMFC) were carried out and phosphorus was extracted by an optimized combination of three methods. Despite the low voltage recorded, ~96 mV (SMFC with carbon paper anode) and ~146 mV (SMFC with stainless steel scourer anode), corresponding to a power density of 1.15 and 0.13 mW/m(2), it was enough to produce an increase in the amounts of metal bound phosphorus (14% vs 11%), Ca-bound phosphorus (26% vs 23%), and refractory phosphorus (33% vs 28%). These results indicate an important role of electroactive bacteria in the phosphorus cycling and open a new perspective for preventing metal bound phosphorus dissolution from sediments.
authors.affiliation: Institute for Biotechnology and Bioengineering, Centre of Biological Engineering, University of Minho, Campus de Gualtar, 4710-057 Braga, Portugal. Electronic address: gilberto.martins@deb.uminho.pt.
authors.forename: G
authors.initials: G
authors.lastname: Martins
authors.forename: L
authors.initials: L
authors.lastname: Peixoto
authors.forename: S
authors.initials: S
authors.lastname: Teodorescu
authors.forename: P
authors.initials: P
authors.lastname: Parpot
authors.forename: R
authors.initials: R
authors.lastname: Nogueira
authors.forename: A G
authors.initials: AG
authors.lastname: Brito
mesh_terms: D001674:Bioelectric Energy Sources; D005591:Chemical Fractionation; D004560:Electricity; D004566:Electrodes; D004583:Electrons; D019015:Geologic Sediments / Q000737:chemistry* / Q000382:microbiology; D010758:Phosphorus / Q000302:isolation & purification*; D013997:Time Factors; D014867:Water / Q000737:chemistry*
chemical_list: D014867:Water; D010758:Phosphorus
keywords: Eutrophication; Lake sediments; Phosphorus; Sediment microbial fuel cell; Wastewater