The Hydogen-Production Capacity Comparision Of Different Biomass Fermentation Types And The Operation Control Of The Reactor

Bio-hydrogen production technology by fermentation uses biomass as raw materials to produce the renewable hydrogen energy. This technology meets the sustainable development strategy, and has become one of the high technology attracting the scientists all over the world. On the base of the continuous flow test of mixed micro-flora, our research were the fermentation types and their H2-production capacity ,the operation control and recoverability of over-acidification state of the bio-hydrogen production reactor.By the researches and analyses of the fermentation type in the bio-hydrogen production system, alcohol type fermentation bacteria have the largest H2-production capability, butyric acid type fermentation bacteria take the second place, and propyl acid type fermentation bacteria have the least H2-production capability. When the influence's COD is 5000mg/L, HRT is 8 hour, and temperature is 35±1℃, the highest H2-production capability corresponding are 3.62, 0.77 and 0.03 mol/kgVSS·d. So we confirm that alcohol type fermentation is the most suitable fermentation type.It's a common phenomenon of acidification for anaerobic biomass reactor. For the fermentation biomass H2-production reactor, in case of ph under 4.0, the reactor will tend to be over-acidification. If the ph fall to 3.8, the reactor must be over-acidification. So the control of ph is the key of avoiding it. And the research result manifest that alkalinity modulation is a more effect way than the reduction of sludge load. When the reactor presents propyl acid type fermentation, we can make the system transition from propyl acid type fermentation to alcohol type fermentation through the addition of 2g cysteine every 3 days. After 20 days, the fermentation type change to propyl acid type fermentation, and the system recovered the H2-production capability.