Zheng X.,Environmental Protection Science Institute of Light Industry |
Li B.,Environmental Protection Science Institute of Light Industry |
Li Y.,Environmental Protection Science Institute of Light Industry |
Chen L.,Environmental Protection Science Institute of Light Industry
Chinese Journal of Environmental Engineering | Year: 2014
To analyze the start-up performances of different inoculation ratio on dry anaerobic digestions for kitchen waste, two parallel treatments with different inoculation ratios (according to the volatile solid amount of substrates and inocula) 0.36 and 0.90 were investigated, and the change of parameters including pH, NH4-N, COD, VFA, content of methane were studied. The results indicated that pH of the two treatments quickly dropped to 4.74 and 5.68, respectively at initial phase, which resulted in acidified conditions, by adjusting of alkali, the treatment that under inculcation ratio of 0.36, still couldn't produce methane, The treatment that under inculcation ratio 0.90, could run stably after self-repairing. Over 72 days operating period, the removal rate of COD reached to 90.29%, biogas with methane content of higher than 60%, yielded up to 255.4 L. Therefore, the inoculation ratio is a significant parameter for dry anaerobic digestion of kitchen waste. Moreover, comparing with traditional wet anaerobic digestion, dry anaerobic digestion can run at higher concentrations of VFA and NH4-N, it is a feasible processing technology for kitchen waste recycling.