Ozonation control and effects of ozone on water quality in recirculating aquaculture systems

Aikaterini Spiliotopoulou, Paula Andrea Rojas-Tirado, Ravi K. Chetri, Kamilla Marie Speht Kaarsholm, Richard Martin, Per Bovbjerg Pedersen, Lars-Flemming Pedersen, Henrik Rasmus Andersen*

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

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Abstract

To address the undesired effect of chemotherapeutants in aquaculture, ozone has been suggested as an alternative to improve water quality. To ensure safe and robust treatment, it is vital to define the ozone demand and ozone kinetics of the specific water matrix to avoid ozone overdose. Different ozone dosages were applied to water in freshwater recirculating aquaculture systems (RAS). Experiments were performed to investigate ozone kinetics and demand, and to evaluate the effects on the water quality, particularly in relation to fluorescent organic matter. This study aimed at predicting a suitable ozone dosage for water treatment based on daily ozone demand via laboratory studies. These ozone dosages will be eventually applied and maintained at these levels in pilot-scale RAS to verify predictions. Selected water quality parameters were measured, including natural fluorescence and organic compound concentration changes during ozonation. Ozone reactions were described by first order kinetics. Organic matter, assessed as chemical oxygen demand and fluorescence, decreased by 25% (low O3), 30% (middle O3) and 53% (high O3), while water transmittance improved by 15% over an 8-day period. No fish mortality was observed. Overall, this study confirms that ozone can improve RAS water quality, provides a better understanding of the ozone decay mechanisms that can be used to define further safe ozone treatment margins, and that fluorescence could be used as a monitoring tool to control ozone. This study might be used as a tool to design ozone systems for full-scale RAS by analysing water sample from the specific RAS in the laboratory.
Original languageEnglish
JournalWater Research
Volume133
Pages (from-to)289-298
ISSN0043-1354
DOIs
Publication statusPublished - 2018

Cite this

@article{22d7402820754ccdb89c4b102ed8a7cd,
title = "Ozonation control and effects of ozone on water quality in recirculating aquaculture systems",
abstract = "To address the undesired effect of chemotherapeutants in aquaculture, ozone has been suggested as an alternative to improve water quality. To ensure safe and robust treatment, it is vital to define the ozone demand and ozone kinetics of the specific water matrix to avoid ozone overdose. Different ozone dosages were applied to water in freshwater recirculating aquaculture systems (RAS). Experiments were performed to investigate ozone kinetics and demand, and to evaluate the effects on the water quality, particularly in relation to fluorescent organic matter. This study aimed at predicting a suitable ozone dosage for water treatment based on daily ozone demand via laboratory studies. These ozone dosages will be eventually applied and maintained at these levels in pilot-scale RAS to verify predictions. Selected water quality parameters were measured, including natural fluorescence and organic compound concentration changes during ozonation. Ozone reactions were described by first order kinetics. Organic matter, assessed as chemical oxygen demand and fluorescence, decreased by 25{\%} (low O3), 30{\%} (middle O3) and 53{\%} (high O3), while water transmittance improved by 15{\%} over an 8-day period. No fish mortality was observed. Overall, this study confirms that ozone can improve RAS water quality, provides a better understanding of the ozone decay mechanisms that can be used to define further safe ozone treatment margins, and that fluorescence could be used as a monitoring tool to control ozone. This study might be used as a tool to design ozone systems for full-scale RAS by analysing water sample from the specific RAS in the laboratory.",
author = "Aikaterini Spiliotopoulou and Rojas-Tirado, {Paula Andrea} and Chetri, {Ravi K.} and Kaarsholm, {Kamilla Marie Speht} and Richard Martin and Pedersen, {Per Bovbjerg} and Lars-Flemming Pedersen and Andersen, {Henrik Rasmus}",
year = "2018",
doi = "10.1016/j.watres.2018.01.032",
language = "English",
volume = "133",
pages = "289--298",
journal = "Water Research",
issn = "0043-1354",
publisher = "I W A Publishing",

}

Ozonation control and effects of ozone on water quality in recirculating aquaculture systems. / Spiliotopoulou, Aikaterini; Rojas-Tirado, Paula Andrea; Chetri, Ravi K.; Kaarsholm, Kamilla Marie Speht; Martin, Richard; Pedersen, Per Bovbjerg; Pedersen, Lars-Flemming; Andersen, Henrik Rasmus.

In: Water Research, Vol. 133, 2018, p. 289-298.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - Ozonation control and effects of ozone on water quality in recirculating aquaculture systems

AU - Spiliotopoulou, Aikaterini

AU - Rojas-Tirado, Paula Andrea

AU - Chetri, Ravi K.

AU - Kaarsholm, Kamilla Marie Speht

AU - Martin, Richard

AU - Pedersen, Per Bovbjerg

AU - Pedersen, Lars-Flemming

AU - Andersen, Henrik Rasmus

PY - 2018

Y1 - 2018

N2 - To address the undesired effect of chemotherapeutants in aquaculture, ozone has been suggested as an alternative to improve water quality. To ensure safe and robust treatment, it is vital to define the ozone demand and ozone kinetics of the specific water matrix to avoid ozone overdose. Different ozone dosages were applied to water in freshwater recirculating aquaculture systems (RAS). Experiments were performed to investigate ozone kinetics and demand, and to evaluate the effects on the water quality, particularly in relation to fluorescent organic matter. This study aimed at predicting a suitable ozone dosage for water treatment based on daily ozone demand via laboratory studies. These ozone dosages will be eventually applied and maintained at these levels in pilot-scale RAS to verify predictions. Selected water quality parameters were measured, including natural fluorescence and organic compound concentration changes during ozonation. Ozone reactions were described by first order kinetics. Organic matter, assessed as chemical oxygen demand and fluorescence, decreased by 25% (low O3), 30% (middle O3) and 53% (high O3), while water transmittance improved by 15% over an 8-day period. No fish mortality was observed. Overall, this study confirms that ozone can improve RAS water quality, provides a better understanding of the ozone decay mechanisms that can be used to define further safe ozone treatment margins, and that fluorescence could be used as a monitoring tool to control ozone. This study might be used as a tool to design ozone systems for full-scale RAS by analysing water sample from the specific RAS in the laboratory.

AB - To address the undesired effect of chemotherapeutants in aquaculture, ozone has been suggested as an alternative to improve water quality. To ensure safe and robust treatment, it is vital to define the ozone demand and ozone kinetics of the specific water matrix to avoid ozone overdose. Different ozone dosages were applied to water in freshwater recirculating aquaculture systems (RAS). Experiments were performed to investigate ozone kinetics and demand, and to evaluate the effects on the water quality, particularly in relation to fluorescent organic matter. This study aimed at predicting a suitable ozone dosage for water treatment based on daily ozone demand via laboratory studies. These ozone dosages will be eventually applied and maintained at these levels in pilot-scale RAS to verify predictions. Selected water quality parameters were measured, including natural fluorescence and organic compound concentration changes during ozonation. Ozone reactions were described by first order kinetics. Organic matter, assessed as chemical oxygen demand and fluorescence, decreased by 25% (low O3), 30% (middle O3) and 53% (high O3), while water transmittance improved by 15% over an 8-day period. No fish mortality was observed. Overall, this study confirms that ozone can improve RAS water quality, provides a better understanding of the ozone decay mechanisms that can be used to define further safe ozone treatment margins, and that fluorescence could be used as a monitoring tool to control ozone. This study might be used as a tool to design ozone systems for full-scale RAS by analysing water sample from the specific RAS in the laboratory.

U2 - 10.1016/j.watres.2018.01.032

DO - 10.1016/j.watres.2018.01.032

M3 - Journal article

C2 - 29407710

VL - 133

SP - 289

EP - 298

JO - Water Research

JF - Water Research

SN - 0043-1354

ER -