▸ Biological – citric acid test
▸ Rouge – citric acid test and visual examination
of reddish (rouge) particles. High amounts of iron oxide compounds
will cause turbidity and lack of transparency of the water sample.
The sample will look characteristically rouge or red. Lower concentrations
of rouge can cause what appears to be discoloration of the water without
apparent turbidity. The sample will look clear, but have reddish or
rouge colour. This is simply because the human eye is not sensitive
enough to detect the turbidity difference at these low concentrations.
▸ Soot – citric acid followed by ERT pH test, and
visual evaluation of black or brownish particles. High amounts of
soot will cause turbidity and lack of transparency of the effluent
sample. The sample will look characteristically brown or black. Lower
concentrations of soot can cause what appears to be discoloration
of the water without apparent turbidity. The sample will look clear,
but have a brownish or black colour. This is simply because the human
eye is not sensitive enough to detect the turbidity difference at
this low concentration. Confirmation may require laboratory analysis.
Sampling Instructions
-
• Take a small container and draw bilge water
before OWS. (To diagnose bilge water contamination.)
• Take a small container and draw bilge water at
OWS outlet. (To diagnose OWS capability to handle contaminated bilge
water.)
• Take a small container and draw bilge water after
post-treatment polishing and particulate filters if installed. (To
diagnose post-treatment capability to handle contaminated bilge water.)