Symbol
Explanation
Dimension
Unit,
See
for example
page
Yobs,NH4
observed yield
MB·MN- 1
kg COD(B)/kg NH!-N
constant for Nitroso monas
Yobs,N02
observed yield conMB·MN- 1
kg COD(B) /kg N02-N
77
stant for Nitrobacter
Yobs,PAO
observed yield
MB· Ms- 1
kg COD(B)/kg COD(S)
constant for phosphorus accumulating
bacteria
a
dimensionless biofilm
145
constant
at
volume per floc
L3
3
3
m,mm
326
ap
volume per primary
L3
m 3 ,mm 3
326
particle
b
energy efficiency
67
b
degree of penetration
148
e
efficiency factor for
146
biofilm
ek
volume fraction
188
h
dimensionless depth
146
in filter
hg
fraction of denitrifying
137
bacteria
hh
hydrolysis reduction
by denitrification
q
hydraulic retention
T
d,h
125
time
qx
sludge age, solids
T
d
123
retention time
370