k
0
A constant
k
00
A constant
K ace Coefficient used in the model developed by the US Army Corps of Engineers
K e
Rate of BOD removal, base e
K nrc Coefficient used in the National Research Council Model for trickling filter
design ¼ 0.0085
K p
Performance measurement parameter
K 10
Rate of BOD removal, base 10
L
Applied removable BOD, M/L
3
L a
Applied BOD after dilution by recirculation, M/L
3
L D
BOD remaining in the effluent at depth 0. M/L
3
L e
BOD of effluent, M/L
3
L o
BOD of influent, M/L
3
M
A constant
N
A constant
n
Number of electron moles transferred per mole of substrate utilized for
energy or station number downstream of each subaerator
Q
Hydraulic loading, L
3 /L
2 /T
Q
Flow rate, L
3 /T
Q
Influent wastewater flow rate, L
3 /T
Q ave Average daily flow, L
3 /T
Q pd Peak daily flow, L
3 /T
Q pm Peak monthly flow, L
3 /T
Q r
Recirculation flow rate, L
3 /T
Q r
Recirculated flow rate, L
3 /T
q w
Wetting rate (surface application rate), L
3 /T/L
2
Q w
Wasted sludge flow rate, L
3 /T
R
Recirculated flow ratio, Qr/Q
S
Substrate concentration, M/L
3
S
Substrate concentration, M/L
3
S ao
Initial concentration of organics removable by adsorption M/L
3
S a
Concentration of remaining organics removable by adsorption, M/L
3
S 1
Effluent substrate concentration of the plug flow process, M/L
3
S c
Substrate concentration within the biofilm cellular matrix, M/L
3
S e
Effluent substrate concentration, M/L
3
S i
Interior substrate concentration, M/L
3
S m
Substrate mass, M
S 0
Bulk liquid substrate concentration, M/L
3
S o
Initial substrate concentration, M/L
3
S s
Substrate concentration at the biofilm surface, M/L
3
t
Time, t
T
Temperature,
F or
C
U
Specific substrate utilization rate, change of soluble substrate concentration
per unit time per unit microbial mass, 1/t
76
L. K. Wang et al.
0
A constant
k
00
A constant
K ace Coefficient used in the model developed by the US Army Corps of Engineers
K e
Rate of BOD removal, base e
K nrc Coefficient used in the National Research Council Model for trickling filter
design ¼ 0.0085
K p
Performance measurement parameter
K 10
Rate of BOD removal, base 10
L
Applied removable BOD, M/L
3
L a
Applied BOD after dilution by recirculation, M/L
3
L D
BOD remaining in the effluent at depth 0. M/L
3
L e
BOD of effluent, M/L
3
L o
BOD of influent, M/L
3
M
A constant
N
A constant
n
Number of electron moles transferred per mole of substrate utilized for
energy or station number downstream of each subaerator
Q
Hydraulic loading, L
3 /L
2 /T
Q
Flow rate, L
3 /T
Q
Influent wastewater flow rate, L
3 /T
Q ave Average daily flow, L
3 /T
Q pd Peak daily flow, L
3 /T
Q pm Peak monthly flow, L
3 /T
Q r
Recirculation flow rate, L
3 /T
Q r
Recirculated flow rate, L
3 /T
q w
Wetting rate (surface application rate), L
3 /T/L
2
Q w
Wasted sludge flow rate, L
3 /T
R
Recirculated flow ratio, Qr/Q
S
Substrate concentration, M/L
3
S
Substrate concentration, M/L
3
S ao
Initial concentration of organics removable by adsorption M/L
3
S a
Concentration of remaining organics removable by adsorption, M/L
3
S 1
Effluent substrate concentration of the plug flow process, M/L
3
S c
Substrate concentration within the biofilm cellular matrix, M/L
3
S e
Effluent substrate concentration, M/L
3
S i
Interior substrate concentration, M/L
3
S m
Substrate mass, M
S 0
Bulk liquid substrate concentration, M/L
3
S o
Initial substrate concentration, M/L
3
S s
Substrate concentration at the biofilm surface, M/L
3
t
Time, t
T
Temperature,
F or
C
U
Specific substrate utilization rate, change of soluble substrate concentration
per unit time per unit microbial mass, 1/t
76
L. K. Wang et al.