Recent updates on biogas production - a review

Abstract

HIGHLIGHTS Biogas; a promising renewable alternative for natural gas with similar applications. Biogas can be produced from different types of organic wastes. AD process is accompanied with several environmental advantages compared with incineration, landfilling, and composting.  Besides energy, AD process generated a nutrientrich biological fertilizer.  Recent developments in metagenomics techniqueshave provided valuable tools to achieve improved AD process. One of the greatest challenges facing the societies now and in the future is the reduction of green house gas emissions and thus preventing the climate change. It is therefore important to replace fossil fuels with renewable sources, such as biogas. Biogas can be produced from various organic waste streams or as a byproduct from industrial processes. Beside energy production, the degradation of organic waste through anaerobic digestion offers other advantages, such as the prevention of odor release and the decrease of pathogens. Moreover, the nutrient rich digested residues can be utilized as fertilizer for recycling the nutrients back to the fields. However, the amount of organic materials currently available for biogas production is limited and new substrates as well as new effective technologies are therefore needed to facilitate the growth of the biogas industry all over the world. Hence, major developments have been made during the last decades regarding the utilization of lignocellulosic biomass, the development of high rate systems, and the application of membrane technologies within the anaerobic digestion process in order to overcome the shortcomings encountered. The degradation of organic material requires a synchronized action of different groups of microorganisms with different metabolic capacities. Recent developments in molecular biology techniques have provided the research community with a valuable tool for improved understanding of this complex microbiological system, which in turn could help optimize and control the process in an effective way in the future. GRAPHICAL ABSTRACT ARTICLE INFO ABSTRACT

Productivity Enhancement Using Kinetic Modeling of Bio-digestion Process-A Review

“…Ilona Sárvári Horváth, Meisam Tabatabaei, Keikhosro Karimi and Rajeev Kumar et al [3] Recent updates on biogas production -a review Investigated increasing demand for renewable energy compels the exploration of new substrates and the development of new technologies for biogas production. Regarding raw materials for AD, it is preferable to utilize waste streams since in this way, the process addresses both waste reduction and energy production.…”

State-of-the-Art Production Chains for Peas, Beans and Chickpeas—Valorization of Agro-Industrial Residues and Applications of Derived Extracts

“…In general, agro-food by-products and wastes are considered to have little value and are often employed as useful substrates for bioenergy/biofuel production, such as a fermentation substrate for the production of biogas and bioethanol [8][9][10], or as an animal feed, since they meet the minimum quality criteria [11]. Nonetheless, in recent years, agro-food residues valorization practices have attracted significant attention with the aim of finding more sustainable managing systems.…”

Presence and transcriptional activity of anaerobic fungi in agricultural biogas plants

“…Lignin is enzymatically not degraded under anaerobic conditions and protects the more easily degradable carbohydrate polymers from rapid decomposition. Therefore pretreatment strategies enabling physical disruption of the plant cell wall would lead to increased accessibility of carbohydrates to microbial enzymatic attack and improved substrate digestibility (Sárvári Horváth et al, 2016).…”