The Mycobacterium sp. CHXY119 and Pseudomonas sp. YATO411
immobilized bead harvested almost 100% of removal for the BTEX
in batch test. The actual oxidation rate was 10.8% for benzene,
10.5% for toluene, 5.8% for ethylbenzene and 11.4% for p-xylene.
The very low mineralization rate meant that a limited oxygen supply
could meet the biodegradation of much more amount of BTEX.
The bioaugmentation PRB process achieved an efficiency increase
of 37.8% for benzene, 14.2% for toluene and 9.4% for p-xylene compared
with biostimulation. The toxicity of the groundwater fell by
91.2% after remediation by the bioaugmentation. The bioaugmentation
PRB of the Mycobacterium sp. CHXY119 and Pseudomonas sp.
YATO411 immobilized bead exhibited great potential for remediating
high-concentration contaminated groundwater.