| Although there was not direct correlation between modified Gompertz model (MGM) and ratio of feedstock to inoculum (RFI) and fermentative concentration (FC),the changes of RFI and FC absolutely resulted in the change of MGM's parameters,so it could make a suitable estimation for RFI and FC by means of the characteristic value of MGM's parameters.Based on this theory,MGM was used to investigate the effect of both RFI and FC on batch mesophilic anaerobic digestion of organic fraction of municipal solid waste (OFMSW) by using single-factor experiment and Uniform Design multi-factor experiment.The results showed that accumulative biogas yield as a function of time had an strong excellent correlation with MGM from which kinetic parameters of anaerobic digestion,such as the maximum accumulative biogas yield,the maximum biogas rate,lag-phase time,biogas potential of VS,and biogas rate of VS,could be directly or indirectly obtained.The characteristics of these kinetic parameters indicated that fermentative concentration had a greater influence on the maximum accumulative biogas yield,the maximum biogas rate,biogas potential of VS,and biogas rate of VS,while the ratio of feedstock to inoculum had a less or no impact on those parameters,especially biogas potential of VS and biogas rate of VS.It also indicated that the optimum VS concentration for anaerobic digestion of OFMSW was 4%-8% and ratio of feedstock to inoculum was 1.5∶1-2.5∶1. |
