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Ref No. [UMCES[CBL 11-020
12
Trial # 5 -
Pre filter 20µm > pre filter 10µm > pre filter 5µm > Test Filter #1, 0.1µm.
19 Jan 2011
Time Point
Heterotrophic
Bacteria
(CFU / 1 ml)
E. coli
(MPN / 100 ml)
CW
Post 0.1 µm
CW
Post 0.1 µm
T-0 Initial
14,450
5
21
0
T-1 Mid
17,700
0
15
0
T-2 Final
15,350
0
12
0
Mean
15,833
1.7
16
0
After the 0.1 µm test filter, a 99.99% reduction (4 log) in heterotrophic bacteria and a 100%
reduction in
E. coli
counts were found.
Trial # 6 -
Pre filter 20µm > pre filter 10µm > pre filter 5µm > Test Filter #5, 0.1µm.
20 Jan 2011
Time Point
Heterotrophic
Bacteria
(CFU / 1 ml)
E. coli
(MPN / 100 ml)
CW
Post 0.1 µm
CW
Post 0.1 µm
T-0 Initial
16,050
0
12
0
T-1 Mid
17,250
10
16
0
T-2 Final
17,850
0
12
0
Mean
17,050
3.3
13
0
After the 0.1 µm test filter, a 99.98% reduction (3.7 log) in heterotrophic bacteria and a 100%
reduction in
E. coli
were found.
5.0 Acknowledgments
The MERC Testing Team included J. Barnes, B. Haley, A. Huq, R. Kanzleiter, T.
Mullady, G. Ruiz, G. Smith, D. Sparks, M. Tamburri, E. Taviani, M. Wilkinson, and K.
Ziombra. We wish thank the crew of the
MV Cape Washington
who provided critical input and
support on all aspects of these trials, and the Maryland Port Administration and U.S. Maritime
Administration for funding and supporting this ballast water treatment evaluation.