RT journal article
T1 The potential of different marine microalgae species to recycle nutrients from recirculating aquaculture systems (RAS) fish farms and produce feed additives
A1 Villar Navarro, Elena
A1 Garrido Pérez, Carmen
A1 Perales Vargas-Machuca, José Antonio
A2 Tecnologías del Medio Ambiente
K1 Marine microalgae
K1 Fish farm
K1 Nutrient removal
K1 Microalgae biomass composition
AB This study researched the use of six microalgae species (N. gaditana, P. lutheri, I. galbana, T. chuii, P. tricornutum and C. gracilis) and a bloom to treat effluent from a marine fish farm and produce quality biomass. More specifically, simulated water from a recirculating aquaculture system (RAS) was used. Microalgae culture was carried out under controlled conditions using 18 L bubble column photoreactors under batch and semi-continuous operation. The main parameters analysed were micronutritional requirements, biomass productivity, nutrient removal rate (nitrogen and phosphorus), biomass composition, and quality. Also, based on the results obtained, a quantitative classification of the microalgae was carried out. The results showed that all microalgae required at least trace metals. In certain species, the addition of vitamins was also required for viable cultivation. In the case of biomass productivity under batch operation, values were between 67 mg L−1 d−1 and 7 mg L−1 d−1 using T. chuii and C. gracilis, respectively, and between 71 mg L−1 d−1 and 9 mg L−1 d−1 using T. chuii and N. gaditana under semi-continuous operation. In the case of total dissolved phosphorus removal, no differences were found between species, reaching in all cases final concentrations <0.01 mg L−1. Total dissolved nitrogen removal rate varied between species and operating conditions, being the highest obtained using T. chuii under semi-continuous operation (12.6 mg L−1 d−1) and the lowest with C. gracilis batch operation (0.15 mg L−1 d−1). Biomass composition in terms of protein and lipids varied between species and operating conditions, but quality in terms of amino acids and fatty acids profile remained homogeneous in all cases. Finally, according to the developed score methodology, I. galbana was the microalgae with the highest biomass production score, while T. chuii was for wastewater treatment. © 2021
PB ELSEVIER
SN 2211-9264
YR 2021
FD 2021-10
LK http://hdl.handle.net/10498/25766
UL http://hdl.handle.net/10498/25766
LA eng
NO This work was carried out within the SUNRAS Project ?Sustainable and Efficient Management of Marine Aquaculture Effluents using Solar Technologies? (N? AGL2016-80507-R; Plan Nacional de I+D+i 2013?2016) funded by Ministry of Economy and Competitiveness, Government of Spain. This study was also supported by a Personal Investigador en Formaci?n (PIF) contract (Ref. UCA/REC01VI/2017) funded by Universidad de C?diz. We also would like to acknowledge the technicians of Servicio Central de Investigaci?n en Cultivos Marinos at the Faculty of Marine and Environmental Science (Universidad de C?diz) and Centro Tecnol?gico de Acuicultura de Andaluc?a (CTAQUA) for their support.
DS Repositorio Institucional de la Universidad de Cádiz
RD 12-nov-2026