FRESHWATER VERIFICATION OF THE BALLAST EYE COMPLIANCE MONITORING DEVICE

Abstract

This technical report presents findings from freshwater verification tests evaluating the performance of the Satake Ballast Eye Viable Organism Analyzer VOA1000K compliance monitoring device, hereafter Ballast Eye. Ballast Eye was developed by Satake Corporation of Hiroshima, Japan.

The compliance monitoring device evaluation began in August 2020 and ended in December 2020 at the Lake Superior Research Institute (LSRI) of the University of Wisconsin-Superior (UWS) in Superior, Wisconsin, USA. Ballast Eye estimates the number of viable organisms and associated risk based on IMO D-2 ballast water discharge standards in the ≥10 and <50 µm (nominally protists) and ≥50 µm (nominally zooplankton) regulated size classes by measuring the fluorescence pulse number from fluorescein diacetate (FDA) stained organisms within a water sample.

The verification testing was composed of three phases. Phase I testing was completed in two water types with laboratory-cultured organisms in the two regulated size classes, utilizing the single-celled protist Haematococcus pluvialis and colonial protist Scenedesmus quadricauda, and the zooplankton Daphnia magna and Eucyclops spp. Phase II was completed using naturally occurring Great Lakes organisms in the Duluth-Superior Harbor of western Lake Superior in the two regulated size classes. Phase III testing was completed using Duluth-Superior harbor water and ambient organisms before and after treatment with a ballast water treatment technology (BWT) during three land-based trials. Data from all phases were analyzed for precision, accuracy, and reliability. Quantification/detection limits were calculated for Phase I data.

Phase I testing showed Ballast Eye was able to accurately estimate the number of zooplankton in high and low transparency water, while protist concentrations were not accurately determined. Phase II testing showed Ballast Eye was unable to accurately estimate the number or risk of ambient zooplankton or protists in Duluth-Superior harbor water. Phase III testing showed that Ballast Eye was able to accurately classify risk of ambient zooplankton or protists within uptake and treated discharge samples collected during land-based ballast water treatment technology testing at the Montreal Pier Facility located on the Duluth-Superior harbor.