Anaerobic Digestion of Chicken Manure in the Presence of Magnetite, Granular Activated Carbon, and Biochar: Operation of Anaerobic Reactors and Microbial Community Structure

Abstract

The influence of magnetite nanoparticles, granular activated carbon (GAC), and biochar, as well as their combinations on the anaerobic digestion of chicken manure and the structure of microbial communities was studied. The addition of magnetite, GAC, and biochar increased the rate of methane production and the total methane yield. It has been observed that these additives stimulated anaerobic microorganisms to reduce the concentration of accumulated volatile organic acids. Various bacterial species within the classes Bacteroidia and Clostridia were found at higher levels in the anaerobic reactors but in different proportions depending on the experiment. Members of the genera Methanosarcina, Methanobacterium, Methanothrix, and Methanoculleus were mainly detected within the archaeal communities in the anaerobic reactors. Compared to the 16S rRNA gene-based study, the mcrA gene approach allowed a higher level of Methanosarcina in the system with GAC + magnetite to be detected. Based on our findings, the combined use of granular activated carbon and magnetite at appropriate dosages will improve biomethane production.

Promoting the Circular Economy on an Island: Anaerobic Co-Digestion of Local Organic Substrates as a Possible Renewable Energy Source

“…The specific biogas yield potential, , was the highest in the C+P+S and in the C+P+O (0.236 and 0.233 L/g-VS added , respectively) compared to the other AcoD combinations. The lowest results were reported in C+P+B with 0.151 L/g-VS added , showing that the bird manure is a refracting waste to treat through anaerobic digestion due to the high nitrogen and lignocellulose content [ 14 ]. Similar trends were observed in the maximum biogas production rate, .…”

“…Additionally, some substrates can be recalcitrant to anaerobic degradation in monodigestion. In this way, bird manure has been quite unpopular due to the high nitrogen and lignocellulose content [ 14 ]; AcoD could be a promising configuration to valorise it. Furthermore, new configurations of the AcoD have been studied; for example, sometimes at lab scale, cattle waste was used only as a source of inoculum to start up the anaerobic digestion, but currently authors are investigating the benefits of AcoD as substrate at once [ 15 ].…”

Evaluating the performance of an integrated membrane-aerated biofilm reactor (MABR) system for high-strength brewery wastewater treatment

“…27,28 The aforementioned taxa usually coexist and work together for anaerobic digestion. 29 Therefore, this might contribute to the degradation of high loads of organic matter in brewery wastewater in the MABR. Other taxa dominated biofilms include Cloacimonadia (relative abundance of 38.9%) and Synergistia (11.3%) in MABR2-S1, Synergistia (14.8%) and Spirochaetia (15.9%) in MABR1-S1, and Anaerolineae (14.4%, 16.2%) and Alphaproteobacteria (14.4%, 21.7%) in MABR2-S2 and MABR2-S3, respectively.…”

Magnetite Nanoparticles and Carbon Nanotubes for Improving the Operation of Mesophilic Anaerobic Digesters

“…Nanomaterials are attractive additives in AD and are used to enhance microbial activity in various anaerobic systems [13][14][15][16][17][18]. Such additives as iron-based nanomaterials (e.g., nanomagnetite (Fe 3 O 4 )), carbon nanotubes (CNTs), and nanoscale zero-valent metals are tested to enhance anaerobic processes at high organic loading rates [19], during treatment of high-solid substrates [15,20], and under ammonia-stressed conditions [16,21,22].…”