Table 2. The options of running parameters of biofilter.

Run time (d)	Inlet concentration of benzene (mg m−3)	Benzene load of biofilter (gm−3 h−1)	Gas flow rate (m3 h−1)
1–30	1000	42.46	2.4
31–60	2000	84.92	2.4
61–90	3000	127.42	2.4