A1 Journal article (refereed), original research

A comparison of photolytic, photochemical and photocatalytic processes for disinfection of recirculation aquaculture systems (RAS) streams


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Publication Details
Authors: Moreno-Andrés Javier, Rueda-Márquez Juan José, Homola Tomáš, Vielma Jouni, Moríñigo Miguel Ángel, Mikola Anna, Sillanpää Mika, Acevedo-Merino Asunción, Nebot Enrique, Levchuk Irina
Publisher: Elsevier: 24 months
Publication year: 2020
Language: English
Related Journal or Series Information: Water Research
ISSN: 0043-1354
eISSN: 1879-2448
JUFO-Level of this publication: 3
Open Access: Open Access publication
Location of the parallel saved publication: http://urn.fi/URN:NBN:fi-fe2020051938365

Abstract

The development of technologically advanced recirculation aquaculture
systems (RAS) implies the reuse of water in a high recirculation rate
(>90%). One of the most important phases for water management in RAS
involves water disinfection in order to avoid proliferation of potential
pathogens and related fish diseases. Accordingly, different approaches
have been assessed in this study by performing a comparison of
photolytic (UV-LEDs) at different wavelengths (λ = 262, 268 and
262 + 268 nm), photochemical (UV-LEDs/H2O2, UV-LEDs/HSO5 and UV-LEDs/S2O82-) and photocatalytic (TiO2/SiO2/UV-LEDs and ZnO/SiO2/UV-LEDs)
processes for the disinfection of water in RAS streams. Different
laboratory tests were performed in batch scale with real RAS stream
water and naturally occurring bacteria (Aeromonas hydrophyla and Citrobacter gillenii) as target microorganisms. Regarding photolytic processes, higher inactivation rates were obtained by combining λ262+268
in front of single wavelengths. Photochemical processes showed higher
efficiencies by comparison with a single UV-C process, especially at
10 mg L−1 of initial oxidant dose. The inactivation kinetic
rate constant was improved in the range of 15–38%, with major efficiency
for UV/H2O2 ∼ UV/HSO5 > UV/S2O82-.
According to photocatalytic tests, higher efficiencies were obtained by
improving the inactivation kinetic rate constant up to 55% in
comparison with a single UV-C process. Preliminary cost estimation was
conducted for all tested disinfection methods. Those results suggest the
potential application of UV-LEDs as promoter of different photochemical
and photocatalytic processes, which are able to enhance disinfection in
particular cases, such as the aquaculture industry.


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Last updated on 2020-05-06 at 08:00