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MERC ER01-12
2
2) Less than 10 viable [live] organisms per ml, less than 50 µm in minimum dimension and
greater than or equal to 10 µm in minimum dimension and
3) Less than the following concentrations of indicator microbes, as a human health standard:
1. Toxigenic
Vibrio cholerae
(serogroups O1 and O139), less than 1 colony forming unit
(cfu) per 100 ml
2.
Escherichia coli,
less than 250 cfu per 100 ml;
3. Intestinal Enterococci, less than 100 cfu per 100 ml.
4. Summary of Test Protocols
4.1 Overview
Please note that this report describes the specifics for the MERC evaluation of the Hyde
BWMS. Details on program policies and testing approaches/methodologies can be found in the
MERC Quality Management Plan (QMP), Quality Assurance Project Plan (QAPP) and various
Standard Operating Procedures (SOPs). The fundamental approach of MERC is to conduct
independent, scientifically-sound, rigorous, and quality assured evaluations of ballast water
treatment systems using the framework provided in the G8/G9 guidelines and specific
methodologies found in ETV protocols. MERC utilizes G8 MEPC 58/23 ANNEX 4, Part 2,
Section 2.3.36 as the standard for a valid test trial: “If in any test cycle the average discharge
results from the control water is a concentration less than or equal to 10 times the values in
regulation D-2.1, the test cycle is invalid”.
Prior to any evaluations of O&M and biological efficacy, commissioning runs of the
Hyde systems were conducted to assure appropriate treatment operations and to identify and
correct any initial mechanical or operating issues. The commissioning for the Hyde 40
µ
m
screen filter + UV was successful and no modifications to the BWMS were made prior to MERC
land-based testing (as confirmed by the email sent by Hyde to MERC dated 17 April 2012).
Based on the commissioning run for the Hyde 55
µ
m disc filter + UV, the following
modifications to the BWMS were made to allow for MERC land-based testing:
a)
By-pass installation (including additional valves, control panel modifications, and
software reconfiguration) to allow filter back-flush to function during testing without
completely stopping the flow of uptake water,
b)
BWMS UVT sensor calibrations and replacements,
c)
BWMS DP sensor replacement, and
d)
BWMS internal data logging system corrections.
Commissioning of the second Hyde BWMS option was also tested for functionality and
successfully commissioned prior to initiating O&M and biological efficacy trials (as confirmed
by the email sent by Hyde to MERC dated 14 May 2012).
After successful commissioning, two types of test trials to evaluate each of the Hyde
BWMS options (40
µ
m screen filter + UV and 55
µ
m disc filter + UV) were conducted: (a)
operations and maintenance (O&M) verification and (b) biological efficacy evaluations. Prior to
initiating biological testing, MERC evaluated the operational and mechanical reliability of both
Hyde BWMS options for 6 to 7 hours of continuous operations (corresponding to over 1,500 m
3
of treated water). Since an active substance was not used, water was treated (passed through the
filter + UV system), then discharged directly overboard using a sea-to-sea pumping mode.
Power consumption, the various other O&M parameters listed in the ETV protocols, and failures