title: First study on oyster-shell-based phosphorous removal in saltwater - A proxy to effluent bioremediation of marine aquaculture.
abstract: The efficiency of oyster-shell waste for the removal of phosphorous (P) in saltwater was herein evaluated. For that, different factors were tested, being attained >56% and >98% P removal by natural oyster shell (NOS)-fraction <0.125mm and COS (calcined oyster shell)-fraction 0.5mm, respectively. Adsorption was the main mechanism suggested for NOS, whilst a co-mechanism of precipitation occurred with COS. NOS adsorption was consistent with Langmuir model and followed both the Elovich and Intraparticle Difusion kinetic models. COS followed only Pseudo-Second Order and, mainly, the Elovich model. Overall, optimal conditions for P removal from saltwater were established for NOS and COS, which will unquestionably allow to comply with regulated P levels for the discharge of wastewater from saltwater RAS.
authors.affiliation: Department of Biology, University of Aveiro, Campus Universitário de Santiago, 3810-193 Aveiro, Portugal.
authors.forename: Marta C
authors.initials: MC
authors.lastname: Martins
authors.affiliation: Department of Chemistry, University of Aveiro, Campus Universitário de Santiago, 3810-193 Aveiro, Portugal; Centre for Environmental and Marine Studies (CESAM), University of Aveiro, Campus Universitário de Santiago, 3810-193 Aveiro, Portugal.
authors.forename: Eduarda B H
authors.initials: EBH
authors.lastname: Santos
authors.affiliation: Department of Biology, University of Aveiro, Campus Universitário de Santiago, 3810-193 Aveiro, Portugal; Centre for Environmental and Marine Studies (CESAM), University of Aveiro, Campus Universitário de Santiago, 3810-193 Aveiro, Portugal. Electronic address: crmarques@ua.pt.
authors.forename: Catarina R
authors.initials: CR
authors.lastname: Marques
mesh_terms: D000327:Adsorption; D060105:Animal Shells; D000818:Animals; D017756:Aquaculture; D001673:Biodegradation, Environmental; D006863:Hydrogen-Ion Concentration; D010125:Ostreidae; D010758:Phosphorus / Q000302:isolation & purification*; D012623:Seawater / Q000737:chemistry; D014874:Water Pollutants, Chemical / Q000302:isolation & purification*; D018508:Water Purification
chemical_list: D014874:Water Pollutants, Chemical; D010758:Phosphorus
keywords: Adsorption isotherms; Biomaterial characterization; Kinetic models; Recirculating aquaculture system; Saline effluent treatment