Symbol
Explanation
Dimension
Unit,
See
for example
page
Dooo
diffusion coefficient
Lz.rl
cm 2 /s
for BOD in biofilm
DH
degree of hydrolysis
184
Doz
diffusion coefficient
Lz.rl
cm 2 /s
178
for oxygen (frequently
in biofilm)
dp
particle diameter
L
mm,mm
319
Dcoo
diffusion coefficient
Lz.rl
cm 2 /s
234
for (organic) matter in
biofilm
E
treatment efficiency
120
f
floc
f(pH)
growth kinetics contri- variable
variable
71
bution from pH
f(S)
growth kinetics
variable
variable
zero order, first order
or Monod kinetics
f(So2)
growth kinetics for
variable
variable
71
oxygen
f(T)
growth kinetics
variable
variable
71
contribution from ternperature
fc/N
efficiency factor for
251
denitrification
fd,max
diurnal constant in
24
max. month (infiltration)
fh,max
constant for max.
23
hour
th,min
constant for min. hour
23
355