Characteristics of Start-Up and Hydrogen Production in Ultrasonic Photo-Biological Reactor

Experimental study on the start-up process and hydrogen production in an ultrasonic photo-biological reactor were conducted in the present study and the effects of ultrasonic time and ultrasonic output power on hydrogen production performance of the biorcactor were investigated.The biomass and pH value of the culture were adopted as indexes to evaluate the start-up process of the bioreactor,and they kept stable after 96 h of start-up,which indicated the start-up process succeeded. In the stable operation stage,the hydrogen production rate and hydrogen yield of the ultrasonic bioreactor firstly increased and then dropped with increases in the ultrasonic time and output power, respectively.However,the glucose removal rate always increased with increasing ultrasonic time.