Table 1.

Overview the biotrickling filter performances and operational parameters (average values over period April 2016 till March 2017 or ranges)

	Biotrickling filter 1 3‐stage non‐inoculated	Biotrickling filter 2 2‐stage inoculated
NH3 removal (%)	50.51 ± 29.73	70.02 ± 27.43
N2O production (%)	39.1 ± 28.5	31.0 ± 23.9
pH (−)	7.5 ± 0.6	7.1 ± 0.6
EC (mS cm−1)	18.7 ± 13.0	20.6 ± 11.3
${\text{NH}}_4^{+}$ (gN l−1)	2.5 ± 1.9	2.8 ± 1.8
${\text{NO}}_2^{-}$ (gN l−1)	2.1 ± 1.5	0.6 ± 0.8
${\text{NO}}_3^{-}$ (gN l−1)	0.5 ± 0.3	1.8 ± 1.3
FA (mgN l−1)	0–119	0–90
FNA (mgN l−1)	0–1.96	0–0.66