2.2. Experimental equipment
The lab-scale equipment used in this study consisted of an illumination
incubator (GP-01, Hengfeng Medical Equipment, China),
four PMMA rectangle reactors (40 cm 25 cm 30 cm) with 15 L
cultures, a gas cylinder maintaining CO2 (99.99% purity), and three
flow meters used to control gas flow at a maximum rate of
100 mL min1. Each acidified reactor was sparged with CO2 from
the upper part of the reactor.