Anaerobic Fermentation Features Of Different Parts Of Corn Stalks At Low Concentrations

In this paper, we studied anaerobic fermentation of different parts of cornstalks：Stem Bark（SB）, Leaf（L）, Stem pith （SP）, corn stalks（CS）, mixed withcow dung, at the aim of providing some theory and data for future using of corn stalks.Based on some biogas projects’ parameters, we carried out a batch experiment to findout the best optimal total solid (TS) concentration of each part of SB, L, SP, CS. Andthe results are as follows:a) Carrying out a batch experiment, and we found out the optimal concentration ofSB, L, SP and CS is respectively8%,10%,5%and8%, under the setting condition(35℃, C/N ratio=25, TS≤10%). It is necessary to separate the corn stalks for theoptimal concentration of the different part is not same.b) SP’s methane production is up to115.3mL/VS g, L’s methane production is upto109.7mL/VS g, SB’s methane production is up to125.0ml/VS g and CS’s methaneproduction is80.0mL/VS g. The potential methane production of broth ranks as: SB>L> SP> CS.c) The methane producing rate of SP, L, SB, CS is up to3.29mL/(VS g·d),3.13mL/(VS g·d),3.57mL/(VS g·d), and2.76mL/(VS g·d), respectively. SP’s, L’s andSB’s rate of methane producingare faster than CS’s rate.d) The Gompertz equation was also adopted to simulate the anaerobic digestionprocess of different materials in this research.The Gompertz equation fitting parametersshow that the biodegradation (from easy to difficult) was: L <SP<SB<CS.