Treatability study of using low frequency ultrasonic pretreatment to augment continuous biohydrogen production

Publication year: 2011
Source: International Journal of Hydrogen Energy, In Press, Corrected Proof, Available online 12 June 2011

Wan-Qian, Guo , Jie, Ding , Guang-Li, Cao , Nan-Qi, Ren , Fu-Yi, Cui

Low frequency ultrasonic treatment was investigated to enhance hydrogen production by bacteria under both batch and continuous operation. Optimal ultrasonic time and intensity as examined in batch experiments were found to be 10 s and 100 W, respectively. Hydrogen production was increased by 20% while ultrasonic treatment could effectively shorten batch test reaction times. Using these optimized conditions, continuous experiments were conducted in two parallel expanded granular sludge bed (EGSB) reactors. The ultrasonic treated EGSB reactor obtained a specific hydrogen production rate of 4.38 L/g VSS·d, which was 32% higher than that in the control reactor. Ethanol-type fermentation was achieved at a faster…

 Highlights: ► Applying low frequency ultrasonic treatment to continuous flow hydrogen production reactor. ► Proposing an effective pretreatment method to promote startup process of the system. ► Biomass was well-activated to resist lower pH and to maintain satisfactory hydrogen production.