Intensive study of fermentative biohydrogen production for food residues by inoculum pretreatment

The batch fermentative hydrogen production at 36 ℃ from food residues with different pretrement of anaerobic digested sludge of non-pretreatment,preheated(80 ℃,15 min),preheated(80 ℃,15 min) and pH value at 6.0 were studied,and efficiency of fermentative hydrogen production was investigated.The results by Gompertz model show that:(1)the lag-phase time(λ),the maximal specific hydrogen rate,the specific hydrogen potential and the maximal hydrogen contents of biogas of the four pretreatment are 7.68,5.06,2.04 h,3.05,10.10,9.24 mL/gVS·h,43.54,167.10,161.93 mL/gVS,18.4%,41.2%,47.2%,respectively.Therefore,preheated(80 ℃,15 min) and pH value at 6.0 pretreatment can enhance hydrogen production.(2)The process of fermentative hydrogen production is an acidification process,so the pH value is among 4.70 to 5.10 in the fermentative end products of the three pretreatments.