Symbol
Explanation
Dimension
Unit,
See
for example
page
k1/2A,02
half order area specific M1/2-L-1/2. T1(g0 2 )112. m-1/2 d-1
rate constant for
oxygen
k1/2V,N03
half order specific vo- M1/2.L -3/2. T1g1/2. m-3/2 d-1
235
lumetric rate constant
for nitrate
k1
first order rate
r1
h-1, d-1
constant
k1Vf
first order rate
r1
h-1, d- 1
144
constant in biofilm
k1A
first order area specific rl. L-2
h-1 -2
·m
149
rate constant
litre
L3
l!
L
biofilm thickness
L
mm,J.l
145
m
metre
L
m!
MN
mass of nitrogen
MN
kg TN
260
Mr,p
mass of phosphorus in M
g P /primary particle
327
one primary particle
Mx
sludge mass
Mx
kg SS, kg COD, kg
121
COD(B)
Mx,aerobic
aerobic sludge mass
Mx
kg SS(B), kg COD, kg
COD(B)
MR
molar ratio (P precimol· mor 1
mole precipitation
340
pitation)
chemical/mol P
MWbiom
molar weight for bio- Mx·mor 1
g/mol
67
mass or sludge (often
set at 113 g/mol)
360