Cold isotherm pressing pretreatment for effective improvement of methane production from Hybrid Pennisetum

Ultra-high pressing pretreatment has been employed to effectively improve methane production from Hybrid Pennisetum. In this study, Hybrid Pennisetum was pretreated by cold isostatic pressing (CIP) to improve methane production. The pretreatment enhanced the accessibility between the substrate and inoculum. The decomposition of the compact biomass structure was analyzed through Fourier Transform Infrared Spectrometer (FT-IR) and X-ray Diffractometer (XRD). Moreover, the electron transfer capability in the system was evaluated by electrochemical analysis. The systematic experiment yielded the highest methane production at a pressure of 400Mpa, reaching 227.67 mL/g VS. The pretreatment changed the reducing sugar content (RS), pH, and volatile fatty acids (VFAs) in the AD system, which in turn increased the cumulative methane production. This study provides a promising platform for the development of an efficient methanogenic pretreatment.

Automated summary

Ultra-high pressing pretreatment was used to improve methane production from Hybrid Pennisetum. Cold isostatic pressing (CIP) was employed as the pretreatment method. The accessibility between substrate and inoculum was enhanced by this pretreatment. Analysis of compact biomass structure decomposition and evaluation of electron transfer capability were carried out. The highest methane production was achieved at a pressure of 400Mpa, with a yield of 227.67 mL/g VS. The pretreatment altered RS, pH, and VFAs in the AD system, leading to increased cumulative methane production. This study provides a promising platform for efficient methanogenic pretreatment development.