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Ref No. [UMCES[CBL 11-020
10
19 Jan 2011
Time Point
Total Phyto
10-50 µm (#/ml)
Total Phyto
5-10 µm (#/ml)
CW
Post 0.1 µm
CW
Post 0.1 µm
T-0 Initial
11,840
0
14,871
4.5
T-1 Mid
13,006
0
16,753
0
T-2 Final
14,726
0
22,156
0
Cells after 0.1µm filtration included
H. rotundatum
and
S. costata.
Trial # 6 -
Pre filter 20µm > pre filter 10µm > pre filter 5µm > Test Filter #5, 0.1µm.
20 Jan 2011
Time Point
Total Phyto
10-50 µm (#/ml)
Total Phyto
5-10 µm (#/ml)
CW
Post 0.1 µm
CW
Post 0.1 µm
T-0 Initial
21,710
0
11,728
0
T-1 Mid
16,120
0
10,597
0
T-2 Final
21,414
0
13,903
0
No cells detected at either time point after the 0.1 µm filter.
4.7. Microbial Community
Samples for bacteria (
Vibrio, E. coli
,
Enterococci
and heterotrophic bacteria) were taken
just before entering the filter system (after the 35-µm net) and after the last filter (0.1 µm) at the
three time points.
Trial # 1 –
Test Filter #1, 0.1 µm (no pre filters). 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
26,300
5
12.1
0
T-1 Mid
N/A
N/A
N/A
N/A
T-2 Final
20,400
0
11.1
0
Mean
23,350
2.5
11.6
0
After the 0.1 µm test filter, a 99.98% reduction (3.8 log) in heterotrophic bacteria and a 100%
reduction in
E. coli
were found.