title: Bioremediation of oxytetracycline in seawater by living and dead biomass of the microalga Phaeodactylum tricornutum.
abstract: Due to its use, a large amount of Oxytetracycline (OTC) is released into water, which has a detrimental impact on aquatic ecosystems and human health. Although there are different physicochemical methods (mainly photodegradation) to remove OTC, there is increasing interest in the use of bioremediation. The sorption characteristics of OTC using living and dead biomass of the microalga Phaeodactylum tricornutum have been investigated in this study. Kinetics, isotherms and maximum elimination capacity were tested and discussed. Kinetic studies showed that the OTC removal by living biomass followed a sigmoidal model. However, the dead biomass followed a pseudo-first order model. The living biomass showed higher efficiency than the dead biomass with maximum sorption capacities of 29.18mgg-1and 4.54mgg-1, respectively. Combination of living biomass and photodegradation under the culture conditions eliminated 13.2mgL-1of OTC during 11h of culture and with an initial OTC concentration of 15mgL-1. With an initial OTC concentration of 2.5mgL-1, 97% of OTC was removed. This removal was mainly caused by bioremediation than by photodegradation. The results proved the potential practical application of the living P. tricornutum biomass for a low-cost and efficient removal of OTC from seawater.
authors: Laboratorio de Microbiología, Facultad de Ciencias, Universidade da Coruña. Campus da A Coruña. 15071A Coruña, Spain.
authors: Sergio
authors: S
authors: Santaeufemia
authors: Laboratorio de Microbiología, Facultad de Ciencias, Universidade da Coruña. Campus da A Coruña. 15071A Coruña, Spain. Electronic address: torres@udc.es.
authors: Enrique
authors: E
authors: Torres
authors: Laboratorio de Microbiología, Facultad de Ciencias, Universidade da Coruña. Campus da A Coruña. 15071A Coruña, Spain.
authors: Roi
authors: R
authors: Mera
authors: Laboratorio de Microbiología, Facultad de Ciencias, Universidade da Coruña. Campus da A Coruña. 15071A Coruña, Spain.
authors: Julio
authors: J
authors: Abalde
mesh_terms: D001673:Biodegradation, Environmental; D018533:Biomass; D007700:Kinetics; D058086:Microalgae; D010118:Oxytetracycline / Q000302:isolation & purification*; D010782:Photolysis; D012623:Seawater; D013816:Thermodynamics; D014874:Water Pollutants, Chemical / Q000302:isolation & purification*
chemical_list: D014874:Water Pollutants, Chemical; D010118:Oxytetracycline
keywords: Bioremediation; Living biomass; Oxytetracycline; Phaeodactylum tricornutum; Sorption