Table 2.

Operation stages of FIR.

Stage	Time (d)	EBRT (s)	Flow rate (m3/h)	Inlet concentration (mg/m3 or CFU/m3)
				H2S	NH3	VOCs	HB	TF
Ⅰ	0–37	48	4320	6.14 ± 5.33	4.18 ± 2.50	4.74 ± 3.51	2921 ± 1359	1381 ± 531
Ⅱ	38–127	48	4320	8.86 ± 5.00	4.28 ± 2.33	5.52 ± 5.28	3164 ± 1332	1601 ± 509
Ⅲ	128–217	36	5760	14.46 ± 10.83	3.72 ± 2.31	7.41 ± 4.96	3482 ± 1195	1254 ± 533
Ⅳ	218–307	24	8640	11.38 ± 7.09	3.78 ± 2.17	7.58 ± 3.27	3063 ± 1093	1522 ± 562