Biofilm formation as a method of improved treatment during anaerobic digestion of organic matter for biogas recovery

Quantitative and Qualitative Changes in the Genetic Diversity of Bacterial Communities in Anaerobic Bioreactors with the Diatomaceous Earth/Peat Cell Carrier

“…The changes taking place in the microbiome are determined by constant and changing environmental conditions during the process, among which the anaerobic conditions, the environmental reaction, the temperature and the depleting medium, as well as additives, in this case cell carriers [ 18 , 71 ]. As confirmed in the recent work by Cayetano et al, (2022), different carrier materials strongly induce the dynamics of the dominant microbial population in each system [ 5 ]. Immobilised, selected high-metabolism and high-survival rate bacterial cells form a much more stable and synergistic microbiome (here composed of Firmicutes and Synergistetes phylum), efficiently producing a biofilm, which was the case in the experiment carried out.…”

“…Currently, researchers are interested in the carriers that mediate the electron transfer involved in methanogenesis. It has been suggested that the promotion of surface contact and improvement of interspecies electron transport have a major impact on the results of anaerobic treatment [ 5 ]. Modern spectroscopy techniques provide important information on the composition and structural organisation of the biofilm which can be useful in elucidating the added function of this special layer of microbial cells.…”

“…In principle, AD is a technology that strengthens closed-loop recycling management systems by reducing greenhouse gas emissions and producing value-added products for the economy and society [ 3 , 4 ]. However, anaerobic biodegradation is limited by three factors most commonly cited in the literature: (1) the limited rate of bioconversion at the substrate hydrolysis level, (2) low conversion rates of biomass, including key intermediate products such as propionic and butyric acids, which is caused, among other things, by (3) a too slow growth of anaerobic bacteria during methanogenesis [ 5 ]. According to the majority of researchers, the rate of cell proliferation in anaerobic bioreactors and their high metabolism improve biogas recovery at a high rate of treatment.…”

The Potential Application of Natural Clinoptilolite-Rich Zeolite as Support for Bacterial Community Formation for Wastewater Treatment

“…The change in pH from 7.4 ± 0.1 to 8.2 ± 0.64 could be attributed to the oxidation of organic substances present in wastewater. During incubation, the pH of the medium increased and could become more electronegative, due to the formation of bacteria biofilm of on the surface of the zeolites and the possibility of their further growth according to Cayetano et al [ 48 ], who identify biofilm formation as enhancing anaerobic digestion.…”

Elucidating the Role of Biofilm-Forming Microbial Communities in Fermentative Biohydrogen Process: An Overview

“…Studies targeting the enrichment of multispecies biofilms evaluate several factors such as the reactor’s geometry, diameter and height, the reactor type, the substrate treatment capacity of the reactor, and the reactor’s ability to retain biomass and biocarriers during acidogenic fermentation [ 82 ]. The up-flow anaerobic sludge blanket reactor (UASBR) has excellent self-immobilization capabilities as bacterial cells forms aggregates without the need for a support/carrier medium leading to high biomass retention and high substrate conversion efficiency [ 83 ], this is usually achieved by applying appropriate up-flow velocities, and this reactor can be operated at mesophilic and thermophilic conditions [ 84 ]. UASBR is constructed in horizontal and vertical forms and used at short HRTs—this is ideal for acidogenic biofilm communities as they optimally produce H 2 at short HRTs [ 85 ].…”