2.2
Convention
–
the International Convention for the Prevention of Pollution from
Ships, 1973, as modified by the 1978 and 1997 Protocols (MARPOL).
2.3
Dilution (Qd)
–
is dilution water, grey water, process water, and/or seawater introduced
to the sewage treatment plant after the influent sample point and
after the influent flow measurement device, see figure 1.
2.4
Effluent (Qe)
–
treated wastewater produced by the sewage treatment plant, see figure
1.
2.5 Flush water – transport medium used
to carry sewage or other wastes from toilets or urinals to the treatment
system.
2.6
Geometric mean – the nth
root of the product of n numbers.
2.7
Grey water – is drainage
from dishwater, galley sink, shower, laundry, bath and washbasin drains
and does not include drainage from toilets, urinals, hospitals, and
animal spaces, as defined in regulation
1.3 of MARPOL Annex IV and does not include drainage from cargo
spaces.
2.8
Hydraulic loading – system
design flow rate of waste water (Qi) into the sewage treatment
plant.
2.9
Influent (Qi)
–
Liquid containing sewage, grey water or other liquid streams, to be
processed by the treatment plant, see figure 1.
2.10
Sample point – A point
for manual collection of a representative sample of influent and effluent
without opening tanks, voids or vents, see figure 1.
2.11
Testing on board – testing,
for the purpose of type approval, carried out on a sewage treatment
plant installed on a ship.
2.12
Testing ashore – testing
ashore, for the purpose of type approval, carried out on a sewage
treatment plant.
2.13
Thermotolerant coliforms –
the group of coliform bacteria which produce gas from lactose in 48
hours at 44.5°C. These organisms are sometimes referred to as
"faecal coliforms"; however, the term "thermotolerant coliforms" is
now accepted as more appropriate, since not all of these organisms
are of faecal origin.