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MERC ER01-12
6
required in Section 5.2.4 of the G9 document (IMO, 2008). Statistical analyses were performed
using ToxCalc statistical software (TSS, 2006) according to methods from USEPA (2002) and
ASTM (2006) guidance documents.
5. Summary of Results
Mechanical Performance:
For both Hyde BWMS options, there were no major operational issues or mechanical
errors resulting in the termination of a test trial. However, the following BWMS specific issues
were noted during testing:
a)
18 April – Hyde O&M (40
µ
m screen filter + UV), UV Transmittance (UVT) sensor
failed, external flow meter required recalibration.
b)
24 April – Hyde-01-Uptake (40
µ
m screen filter + UV), UVT sensor replaced and
calibrated prior to uptake run.
c)
27 April – Hyde-01-Discharge (40
µ
m screen filter + UV), UVT sensor removed and
cleaned, UV treatment chamber opened to check for fouling. Upon restarting the
BWMS, a ground-fault was detected and the system shut down. The issue was resolved
and testing continued.
d)
30 April – Hyde-02-Uptake (40
µ
m screen filter + UV), Hyde manually turned on all 8
available UV lamps (as opposed to default setting of 6 lamps) for the entire treatment
uptake.
e)
3 May – Hyde-02-Discharge (40
µ
m screen filter + UV), Hyde manually turned on all 8
available UV lamps (as opposed to default setting of 6 lamps) for the entire treatment
discharge.
f)
15 May – Hyde-03-Uptake (55
µ
m disc filter + UV), faulty UVT sensor readings caused
the 6 UV lamps to immediately go to the high intensity mode (from 70% to 100%) at the
initiation of treatment uptake.
g)
21 May – Hyde-04 Uptake (55
µ
m disc filter + UV), faulty UVT sensor readings caused
the 6 UV lamps to immediately go to the high intensity mode (from 70% to 100%) at the
initiation of treatment discharge.
Complete data sets for operational parameters and performance during O&M and biological
trials (e.g., filter back-flush frequency, BWMS power consumption, etc.) are available upon
request.
Biological Performance
:
Water quality conditions and planktonic communities during this evaluation were typical
of spring in the upper Chesapeake Bay, including a bloom of the dinoflagellate
Prorocentrum
minimum
. In some trials,
P. minimum
died off in surrounding waters, and in the experimental
ballast tanks during hold times, resulted in significant decreases in dissolved oxygen levels (from
the microbial decomposition of dead
P. minimum
) but these conditions did not compromise the
validity of results.
The MERC evaluation of the Hyde BWMS was terminated prior to the completion of all
trials described in the Test Plan because results from the first two consecutive biological test
trials, for both options, clearly demonstrated that treated water on discharge did not meet USCG
and IMO ballast water discharge standards. In all biological test trials, treated discharge water