Skip to Main content Skip to Navigation
Journal articles

UV spectrophotometry for monitoring the performance of a yeast-based deoxygenation process to treat ships' ballast water

Abstract : This study assessed the usefulness of UV spectrophotometry for the monitoring of a yeast-based deoxygenation process proposed for ships' ballast water treatment to prevent the transfer of aquatic invasive species. Ten-day laboratory experiments using three treatment concentrations and different water types were conducted and resulted in complete oxygen depletion of treated waters. The treatment performance and quality of treated waters were determined by measuring the UV-visible absorbance spectra of water samples taken over time. Samples were also used for laboratory analysis of water quality properties. The UV absorbance spectra values were strongly correlated (r = 0.96) to yeast cell density in treated waters. The second-order derivative (D (2)) of the spectra varied greatly over time, and the spectrum profiles could be divided into two groups corresponding to the oxygenated and anoxic phases of the treatment. The D (2) value at 215 nm was strongly correlated (r = 0.94) to ammonia levels, which increased over time. The D (2) value at 225 nm was strongly correlated (r \textgreater 0.97) to DO concentration. Our results showed that UV spectrophotometry may provide a rapid assessment of the behavior and performance of the yeast bioreactor over time by quantifying (1) the density of yeast cells, (2) the time at which anoxic conditions were reached, and (3) a water quality index of the treated water related to the production of ammonia. We conclude that the rapidity of the technique confers a solid advantage over standard methods used for water quality analysis in laboratory and would permit the direct monitoring of the treatment performance on-board ships
Document type :
Journal articles
Complete list of metadatas

https://hal-univ-rennes1.archives-ouvertes.fr/hal-01286253
Contributor : Nelly Brenner <>
Submitted on : Thursday, March 10, 2016 - 3:15:29 PM
Last modification on : Tuesday, March 3, 2020 - 5:15:37 PM

Identifiers

Citation

Éloïse Veilleux, Yves Lafontaine, Olivier Thomas. UV spectrophotometry for monitoring the performance of a yeast-based deoxygenation process to treat ships' ballast water. Environmental Monitoring and Assessment, Springer Verlag (Germany), 2016, 188 (4), pp.207. ⟨10.1007/s10661-016-5209-3⟩. ⟨hal-01286253⟩

Share

Metrics

Record views

114