AI Article Synopsis
- Biogas generation from microalgae biomass is the simplest method to create bioenergy, but optimizing the breakdown of cell walls during anaerobic digestion is crucial for efficiency.
- Enzymatic pretreatments are particularly effective for disrupting microalgae, with findings showing that adding protease can enhance methane production, despite potential inhibition caused by excess ammonium nitrogen.
- Solutions to the inhibition problem include using low-nitrogen growth conditions for microalgae and employing ammonia-tolerant anaerobic inocula, highlighting the importance of microalgae proteins in the anaerobic digestion process.
Article Abstract
Biogas generation is the least complex technology to transform microalgae biomass into bioenergy. Since hydrolysis has been pointed out as the rate limiting stage of anaerobic digestion, the main challenge for an efficient biogas production is the optimization of cell wall disruption/hydrolysis. Among all tested pretreatments, enzymatic treatments were demonstrated not only very effective in disruption/hydrolysis but they also revealed the impact of microalgae macromolecular composition in the anaerobic process. Although carbohydrates have been traditionally recognized as the polymers responsible for the low microalgae digestibility, protease addition resulted in the highest organic matter solubilization and the highest methane production. However, protein solubilization during the pretreatment can result in anaerobic digestion inhibition due to the release of large amounts of ammonium nitrogen. The possible solutions to overcome these negative effects include the reduction of protein biomass levels by culturing the microalgae in low nitrogen media and the use of ammonia tolerant anaerobic inocula. Overall, this review is intended to evidence the relevance of microalgae proteins in different stages of anaerobic digestion, namely hydrolysis and methanogenesis.
Download full-text PDF |
Source |
|---|---|
| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6099730 | PMC |
| http://dx.doi.org/10.3390/molecules23051098 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Proximity-Ligation Metagenomic Sequence Analysis Reveals That the Antibiotic Resistome Makes Significant Transitions During Municipal Wastewater Treatment.
Environ Microbiol
January 2025
Department of Civil, Environmental, and Geo-Engineering, University of Minnesota, Minneapolis, Minnesota, USA.
Shotgun and proximity-ligation metagenomic sequencing were used to generate thousands of metagenome assembled genomes (MAGs) from the untreated wastewater, activated sludge bioreactors, and anaerobic digesters from two full-scale municipal wastewater treatment facilities. Analysis of the antibiotic resistance genes (ARGs) in the pool of contigs from the shotgun metagenomic sequences revealed significantly different relative abundances and types of ARGs in the untreated wastewaster compared to the activated sludge bioreactors or the anaerobic digesters (p < 0.05).
View Article and Find Full Text PDFBiochar@MIL-88A(Fe) Accelerates Direct Interspecies Electron Transfer and Hydrogen Transfer in Waste Activated Sludge Anaerobic Digestion: Exploring Electron Transfer and Biomolecular Mechanisms.
Environ Res
January 2025
Research & Development Institute in Shenzhen, School of Chemistry and Chemical Engineering, Northwestern Polytechnical University, China. Electronic address:
Adding additives exogenously is an effective strategy to enhance methanogenic activity and improve AD stability. Corn straw-based biochar@MIL-88A(Fe) (BM) was synthesized herewith and used as an exogenous additive to boost methane (CH) production. After adding BM at 250 mg/g WAS VS, the accumulative CH production and maximum CH yield increased by 1.
View Article and Find Full Text PDFResilience and Response of Anaerobic Digestion Systems to Short-term Hydraulic Loading Shocks: Focusing on Total and Active Microbial Community Dynamics.
Environ Res
January 2025
Department of Civil and Environmental Engineering, University of Alberta, Edmonton, Canada; School of Civil & Environmental Engineering, Queensland University of Technology, Brisbane, QLD, Australia.
Anaerobic digestion is known to be sensitive to operational changes, such as hydraulic loading shock, yet the impact on the microbiome, particularly the active RNA-based community, has not been fully understood. This study aimed to investigate the performance of anaerobic reactors and their microbial communities under short-term hydraulic loading shocks. Using synthetic wastewater, the reactor was subjected to 24-hour shocks at three-fold and seven-fold the baseline loading rate, followed by DNA and RNA analyses to assess the system's resiliency and microbial responses.
View Article and Find Full Text PDFAeration promotes Proteobacteria over Firmicutes in macerated food waste resulting in superior anaerobic digestion efficiency.
FEMS Microbiol Lett
January 2025
School of Civil and Environmental Engineering, UNSW Sydney, NSW 2052, Australia.
Aeration is a common pretreatment method to enhance biogas production via anaerobic digestion of waste organic feedstocks such as unused food. While impacts on downstream anaerobic digestion have been intensively investigated, the consequence of aeration on the microbial community in food waste has not been characterised. Food waste has a low pH resulting from the dominance of lactic acid bacteria within the Firmicutes phylum.
View Article and Find Full Text PDFPolymicrobial bacteremia including Ignatzschineria indica caused by myiasis in a female patient with carcinoma of unknown primary.
J Infect Chemother
January 2025
Department of Clinical Laboratory, Kanazawa Medical University Hospital, 1-1 Daigaku, Uchinada, Kahoku, Ishikawa 920-0293, Japan; Department of Infectious Diseases, Kanazawa Medical University, 1-1 Daigaku, Uchinada, Kahoku, Ishikawa, 920-0293, Japan. Electronic address:
A 70-year-old woman with a 6-month history of poor hygiene presented with a right occipital mass, ulceration, and neck swelling. The right occipital region was infested with approximately 100 fly maggots, and the mass contained a foul-smelling abscess. Maggots were removed, and the mass was drained, irrigated, and dressed with padding.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!