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Table 3

Hydraulic load, observed inflow and outflow concentrations and outflow concentrations modelled using the Tanks-in-Series model (P = 3, Θ = 1.08 for temp adjustment of k20)

VariableTime periodHydraulic load m/dInflow conc. mg/lLoad g/(m2*d)Remov. rate, k m/dC* mg/lPredicted outflow conc mg/lObserved outflow conc mg/l
BOD5 Sept-Dec-17 0.58 7.5 4.3 0.235a 1a 5.4 6.6 
Feb-Jul-18 0.47 11.4 5.3 0.235a 1a 7.5 6.4 
TN Sept-Dec-17 0.58 10.5 6.1 0.089b 9.3 9.4 
Feb-Jul-18 0.47 10.4 4.9 0.089b 9.0 8.5 
NH4+-N Sept-Dec-17 0.58 0.72 0.42 0.056b 0.66 0.06 
Feb-Jul-18 0.47 0.40 0.18 0.056b 0.35 0.03 
VariableTime periodHydraulic load m/dInflow conc. mg/lLoad g/(m2*d)Remov. rate, k m/dC* mg/lPredicted outflow conc mg/lObserved outflow conc mg/l
BOD5 Sept-Dec-17 0.58 7.5 4.3 0.235a 1a 5.4 6.6 
Feb-Jul-18 0.47 11.4 5.3 0.235a 1a 7.5 6.4 
TN Sept-Dec-17 0.58 10.5 6.1 0.089b 9.3 9.4 
Feb-Jul-18 0.47 10.4 4.9 0.089b 9.0 8.5 
NH4+-N Sept-Dec-17 0.58 0.72 0.42 0.056b 0.66 0.06 
Feb-Jul-18 0.47 0.40 0.18 0.056b 0.35 0.03 

aFor inflow concentrations 3–30 mg/l, 50% percentile, no temp adjustment of k (Kadlec & Wallace 2009).

bAdjusted k-value for 25 °C.

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