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
Published in : Ecological engineering
Volume(Issue) : 136
Pages : 1
Pages to: 9
Publisher / Ed. Institution : Elsevier
Issue Date: 2019
License (according to publishing contract) : Licence according to publishing contract
Type of review: Peer review (publication)
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 pro- tozoa. 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.
Departement: Life Sciences and Facility Management
Organisational Unit: Institute of Natural Resource Sciences (IUNR)
Publication type: Article in scientific journal
DOI : 10.1016/j.ecoleng.2019.05.021
ISSN: 0925-8574
URI: https://digitalcollection.zhaw.ch/handle/11475/17506
Appears in Collections:Publikationen Life Sciences und Facility Management

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