Treatment of aquaculture effluent with Chlorella vulgaris and Tetradesmus obliquus : the effect of pretreatment on microalgae growth and nutrient removal efficiency

Tejido-Nuñez, Yaiza; Aymerich, Enrique; Sancho, Luis; Refardt, Dominik

doi:10.1016/j.ecoleng.2019.05.021

Publication type:	Article in scientific journal
Type of review:	Peer review (publication)
Title:	Treatment of aquaculture effluent with Chlorella vulgaris and Tetradesmus obliquus : the effect of pretreatment on microalgae growth and nutrient removal efficiency
Authors:	Tejido-Nuñez, Yaiza Aymerich, Enrique Sancho, Luis Refardt, Dominik
et. al:	No
DOI:	10.1016/j.ecoleng.2019.05.021
Published in:	Ecological Engineering
Volume(Issue):	136
Page(s):	1
Pages to:	9
Issue Date:	2019
Publisher / Ed. Institution:	Elsevier
ISSN:	0925-8574
Language:	English
Subjects:	Aquakultur; Mikroalge; Protozoa; Nährstoff; Abwasserreinigung
Subject (DDC):	630: Agriculture
Abstract:	The ongoing and increasing worldwide demand for fish has caused a steady increase in aquaculture production during the last decades. This emphasizes the importance of farming systems with a low ecological footprint, like recirculating aquaculture systems (RAS), which are an alternative to traditional open systems. Furthermore, implementing microalgae treatments in RAS, sustainable water management and low discharge of concentrated wastewater could be achieved, allowing its reuse in the system. The influence of three factors on microalgae treatment efficiency in RAS water were studied: i) microalgae species (Chlorella vulgaris, Tetradesmus obliquus), ii) water pre-treatment (sterile filtration), and iii) sampling location within the RAS (e.g. from fish tank, after UV- disinfection, etc.). To this end, fully factorial, replicated cultivations were carried out in 100-ml flasks, and nutrient removal, microalgae growth, and density of bacteria and protozoa were measured for up to 18 days. Results show that both species are able to grow in RAS water and effectively remove nutrients in it, yet their performance depended greatly on water quality. In sterile RAS water, growth and nutrient removal efficiency of C. vulgaris surpassed that of T. obliquus. In non-sterile RAS water, the pattern reversed because of grazing protozoa. The location of sampling within the RAS had no discernible effect on microalgae growth or nutrient removal efficiency. The results confirm that a microalgae-based technology to treat and valorise RAS water is technically feasible, yet caution that inferences made can be reversed depending on the choice of the species and the pretreatment of the RAS water prior to cultivation.
URI:	https://digitalcollection.zhaw.ch/handle/11475/17506
Fulltext version:	Published version
License (according to publishing contract):	Licence according to publishing contract
Departement:	Life Sciences and Facility Management
Organisational Unit:	Institute of Natural Resource Sciences (IUNR)
Appears in collections:	Publikationen Life Sciences und Facility Management

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Tejido-Nuñez, Y., Aymerich, E., Sancho, L., & Refardt, D. (2019). Treatment of aquaculture effluent with Chlorella vulgaris and Tetradesmus obliquus : the effect of pretreatment on microalgae growth and nutrient removal efficiency. Ecological Engineering, 136, 1–9. https://doi.org/10.1016/j.ecoleng.2019.05.021

Tejido-Nuñez, Y. et al. (2019) ‘Treatment of aquaculture effluent with Chlorella vulgaris and Tetradesmus obliquus : the effect of pretreatment on microalgae growth and nutrient removal efficiency’, Ecological Engineering, 136, pp. 1–9. Available at: https://doi.org/10.1016/j.ecoleng.2019.05.021.

Y. Tejido-Nuñez, E. Aymerich, L. Sancho, and D. Refardt, “Treatment of aquaculture effluent with Chlorella vulgaris and Tetradesmus obliquus : the effect of pretreatment on microalgae growth and nutrient removal efficiency,” Ecological Engineering, vol. 136, pp. 1–9, 2019, doi: 10.1016/j.ecoleng.2019.05.021.

TEJIDO-NUÑEZ, Yaiza, Enrique AYMERICH, Luis SANCHO und Dominik REFARDT, 2019. Treatment of aquaculture effluent with Chlorella vulgaris and Tetradesmus obliquus : the effect of pretreatment on microalgae growth and nutrient removal efficiency. Ecological Engineering. 2019. Bd. 136, S. 1–9. DOI 10.1016/j.ecoleng.2019.05.021

Tejido-Nuñez, Yaiza, Enrique Aymerich, Luis Sancho, and Dominik Refardt. 2019. “Treatment of Aquaculture Effluent with Chlorella Vulgaris and Tetradesmus Obliquus : The Effect of Pretreatment on Microalgae Growth and Nutrient Removal Efficiency.” Ecological Engineering 136: 1–9. https://doi.org/10.1016/j.ecoleng.2019.05.021.

Tejido-Nuñez, Yaiza, et al. “Treatment of Aquaculture Effluent with Chlorella Vulgaris and Tetradesmus Obliquus : The Effect of Pretreatment on Microalgae Growth and Nutrient Removal Efficiency.” Ecological Engineering, vol. 136, 2019, pp. 1–9, https://doi.org/10.1016/j.ecoleng.2019.05.021.