Symbol
Explanation
Dimension
Unit,
See
for example
page
SN03
concentration of
MN· L- 3
gN03-N/m 3
90
nitrate nitrogen
Sorg.P
dissolved organic
M· L- 3
gP/m 3
49
phosphorus
So2
oxygen concentration M· L- 3
g02/m 3
94
So2,2
oxygen concentration M· L- 3
g02/m 3
72
in reactor
Sp04
dissolved inorganic
M· L- 3
gP04-P/m 3
49
orthophosphate
Sp-P
dissolved inorganic po- M . L-3
gP/m 3
49
lyphosphate
Ss
dissolved biological,
M· L- 3
kg COD(S)/m 3
43
easily degradable organic matter
52
substrate concentraM· L- 3
kg BOD(S)/m 3 ,
tion in reactor
gCOD/m 3
SDI
sludge density index
M L-3
g/1, kg/m 3
50
SVI
sludge volume index L3 ~1
rnl/g ss
50
ss
suspended solids (dry M
kgSS
solids)
SS(B)
biomass or sludge
M
kgSS
measured as suspended solids, SS
time
T
h,d
tonne
M
tonnes
T
temperature
oc
td,year
diurnal factor
T-1 1
d/year
23
th,d
time factor
T-1 1
h/d
366