A novel enrichment approach for anaerobic digestion of lignocellulosic biomass: Process performance enhancement through an inoculum habitat selection

Abstract

Inocula enrichment was performed using an innovative habitat-based selection approach to improve wheat straw (WS) anaerobic digestion (AD) efficiency. The procedure was carried out by sequentially re-inoculating the primary microbial community seven times in subsequent anaerobic reactors containing untreated WS. Re-inocula were performed at different re-inoculum times (24, 48, and 96 h) by moving a porous support mimicking a rumen structure from one batch to the next (S-tests) or re-inoculating only the culture medium (C-tests). Highest H₂ production yields were observed after four and five re-inocula (0.08 ± 0.02 NmL h^-1 gVS^-1 and 0.09 ± 0.02 NmL h^-1 gVS^-1) for S-24 and S-48, respectively. For S-96, higher CH₄ yields were observed after the start-up test and sixth re-inoculum (0.05 ± 0.003 NmL h^-1 gVS^-1 and 0.04 ± 0.005 NmL h^-1 gVS^-1, respectively). Accordingly, S-96 showed the highest active Archaea component (7%). C-test microbial communities were dominated by fermenting, hydrogen-producing bacteria and showed lower microbial community diversity than S-tests.

Keywords: Ecological niche; Hydrogen production; Methane production; Rumen wall structure; Wheat straw.