In the second stage from day 8 to day 47, which was initiated by addition of both the immobilized bead and ORCs; for each pollutant of the BTEX, biodegradation efficiency gradually increased up to the maximum because of continuous growth of Mycobacterium sp. CHXY119 and Pseudomonas sp. YATO411,
followed by a rather stable duration of bioremediation efficiency owing to the maximum biomass of Mycobacterium sp. CHXY119 and Pseudomonas sp. YATO411, and then a continuous decline in biodegradation efficiency occurred due to the shortage of oxygen supply and slow accumulation of intrinsic microorganisms