Study of the Craftwork Inpilot Scale Reactor of Hydrogen Generation from Kitchen Waste

Kitchen waste disposal was laid more and more importance since its using as forage was forbidden. On the other hand, as one kind of reproducible, clean and efficient resource, H2 biological producing attracted much interesting these years. This paper focus on influences of substrate refreshing manners on the hydrogen generation in SARD with mixed substrate kitchen waste and sludge, in which kitchen waste was inoculated with sludge, and mineralized garbage and composite alkali as buffering agent and activator. It was concluded that the less ratio and more frequent refreshingof substrate manner (plan A) could gain better performances, which include higher hydrogen generation rate (102.5 mL/g-VS) and longer operation period of the reactor. These results were 76% and 119% better than the dramatic substrate refreshing manner of B. From the analysis reasons caused above difference could be attributed to their different influences extent on pH. Hydrogenogens was very sensitive to pH. Reasonable pH value could improve the effect of hydrogen production. When the accumulation of organic acid resulted in pH declined to 4.7 or below, the hydrogenogens would be inactivation and hydrogen production process would stop. It could be concluded that the dramatic refreshing manner resulted in the excess accumulation of organic acid and pH declining. Therefore, the refreshing of substrate afterwards should pay attention on this.