Basic HTML Version
MERC ER02-10
13
V. cholerae –
No detectable culturable toxigenic
Vibrio cholerae
were detected in any
samples during any of the trials.
Heterotrophic
Bacteria
T0
cfu/1ml
TF
cfu/1ml
Control
950 (300)
55 (31)
Treated
0 (0)
13,780 (2,560)
Toxicity Summaries
Residual Chlorine
Analysis
- Levels of residual chlorine (or total residual oxidants -
TRO) were below the permissible discharge limit of 0.10 ppm in all TF treated samples. Values
ranged from 0.06 ppm to below the method detection limit (MDL) of 0.02 ppm.
Chronic Toxicity
- Results showed that ballast water discharge was not chronically toxic
to any of the three tested species.
Disinfection By-Products
(µg/l)
Control
Treated
BW
Treated RDL/MRL
T0
T0
T0
TF
Trihalomethanes
0
27
0.63
168.2
0.5
Trichloromethane
< 0.5
< 0.5
< 0.5
< 0.5
0.5
Bromodichloromethane
< 0.5
1.2
< 0.5
2.3
0.5
Dibromochloromethane
< 0.5
10.6
< 0.5
17.9
0.5
Tribromomethane
< 0.5
15.2
0.63
148
0.5
Haloacetic Acids
0
71.1
1.9
6.9
1.0
Monochloroacetic acid
< 2.0
< 2.0
< 2.0
< 2.0
2.0
Dichloroacetic acid
< 1.0
< 1.0
< 1.0
< 1.0
1.0
Trichloroacetic acid
< 1.0
< 1.0
< 1.0
1.4
1.0
Bromochloroacetic acid
< 1.0
2.9
< 1.0
< 1.0
1.0
Monobromoacetic acid
< 1.0
1.4
< 1.0
< 1.0
1.0
Dibromoacetic acid
< 1.0
28.4
< 1.0
5.5
1.0
Tribromoacetic acid
< 4.0
38.4
1.9
0
1.0
Other
Sodium chlorate
< 10
170
< 10
< 10
10
Sodium bromate
< 50.0
< 50.0
< 50.0 < 50.0
50.0
Monochloroacetonitrile
<0.5
<0.5
<0.5
<0.5
Dichloroacetonitrile
<0.5
<0.5
<0.5
<0.5
0.5
Monobromoacetonitrile
<0.5
<0.5
<0.5
<0.5
Dibromoacetonitrile
<0.5
15
<0.5
7.4
0.5
BW = backwash
RDL = reporting detection limit
MRL = method reporting limit