Research On Hydrogen Performance Of Representative Components Of Food Waste In Anaerobic Fermentation

With the increase of food waste,The environmental problems are becoming more and more obvious.Hydrogen production from anaerobic fermentation not only can realize food waste stabilization,but also obtain clean energy.Through batch experiment,the studies used the rice,lean pork,peanut oil and greengrocery as characteristic substrate to simulate starch,protein,lipids and fibers in food waste,respectively,and using the feature objects aided strategy to evaluate the biohydrogen production from raw and cooked feature food waste components in different sludge inoculum conditions.The result indicated that the sludge A was more suitable for seed of anaerobic digestion for raw and cooked.The highest hydrogen cumulating hydrogen production was 225.15 mL gVS-1 and 186.12 mL gVS-1 when carried from optimal S/I= 0.5:1(VS based).While the highest hydrogen cumulating hydrogen production was obtained from S/I=1:1 when inoculated in sludge B,which was 59.62 mL gVS-1 and 166.97 mL gVS-1,respectively.Meanwhile,the anaerobic digestion inoculated with sludge B showed a longer lag time.The by-production of anaerobic digestion was dominated by acetate and butyric,indicated a butyric acid path in the anaerobic digestion.During the digestion,part of ammonia nitrogen was utilized as a nitrogen source.Moreover,the system showed inhibition phenomenon causing by acetic acid,molecular acetic acid,molecular butyric acid and pH.As for the raw and cooked pork,no matter what sludge inoculated,the highest hydrogen cumulating hydrogen production was found to be no obviously difference,which was low value of 0.6 mL gVS-1 and 0.73 mL gVS-1,indicated that the substrate was not suitable for biohydrogen production.And there was no obvious relevant between hydrogen production efficiency and S/I.By-product of digestion was mainly contained acetate,propionic,butyric and isovaleric,indicating a mixed digestion form in the anaerobic digestion.The generation of ammonia nitrogen,propionic acid and high pH all have an effect on performance.Showed an equally low performance with the pork,the peanut oil achieve a cumulating hydrogen production of 2.97 mL gVS-1 and 3.28 mL gVS-1,which was not suitable for hydrogen fermentation.And the lag time even can attain a 100 h especially.There was also no obviously relevant between hydrogen production efficiency and S/I.By-product of digestion was mainly contained acetate,butyric,propionic and isovaleric,indicating a mixed digestion form in the anaerobic digestion.The high concentration of 2377.27 mg·L-1 for propionic was one reason which causing a low degree of hydrogen production efficiency.For vegetables,the optimal S/I for hydrogen generation was 2.5:1 when inoculated with sludge A.The maximum cumulating hydrogen production for fresh raw vegetable,fresh cooked vegetable,roasted raw vegetable and roasted cooked vegetable was 21.82 mL·gVS-1,41.86 mL gVS-1,32.09 mL·gVS-1 and 7.70 mL·gVS-1,respectively.An increasing concentration of ammonia nitrogen caused a longer lag time for roasted vegestable.Alternatively,for the fresh raw vegetable,fresh cooked vegetable and its juice,residue of lag time and duration appear an order of residue>raw>juice.During the digestion,the pH,high concentration of ammonia nitrogen and generation of propionic was harmful for hydrogen production.