Anaerobic Digestion
Anaerobic Digestion - Related Videos
01:27
Anaerobic Digestion of Bioplastics for Biogas Production
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2025
Begin with an anaerobic digester, a sealed, oxygen-free reactor seeded with a synthetic sludge that mimics the settled solids from wastewater.The sludge contains mesophilic anaerobic microbes, a mixed microbial community.These microbes thrive at moderate temperatures and drive the digestion of the sludge’s organic matter.Continuously mix the sludge to sustain the bacterial activity and promote digestion.Later, add bioplastics, which are biodegradable polymers, into the sludge.During incubation,...
07:34
Evaluation of Integrated Anaerobic Digestion and Hydrothermal Carbonization for Bioenergy Production
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Cited by 41 •
2014
A novel Upflow Anaerobic Solid State (UASS) reactor was used for biogas production from fibrous feedstock. Digestate from UASS reactor was hydrothermally carbonized into HTC biochar in a pressurized batch reactor. The integration of the two bioenergy concepts was applied in this study to increase overall bioenergy production.
11:31
Continuously-stirred Anaerobic Digester to Convert Organic Wastes into Biogas: System Setup and Basic Operation
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Cited by 34 •
2012
Laboratory-scale anaerobic digesters allow scientists to research new ways of optimizing existing applications of anaerobic biotechnology and to evaluate the methane producing potential of various organic wastes. This article introduces a generalized model for the construction, inoculation, operation, and monitoring of a laboratory-scale continuously stirred anaerobic digester.
02:34
Preparing an Anaerobic Sludge Culture under Oxygen-Free Conditions
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2025
Source: Wagner, A. O.,et al., Medium Preparation for the Cultivation of Microorganisms under Strictly Anaerobic/Anoxic Conditions. J. Vis. Exp. (2019)This video demonstrates the preparation and inoculation of anaerobic cultures using oxygen-free sludge under strictly controlled, deoxygenated conditions.
11:13
Culturing and Maintaining Clostridium difficile in an Anaerobic Environment
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Cited by 100 •
2013
Clostridium difficile is a pathogenic bacterium that is a strict anaerobe and causes antibiotic associated diarrhea (AAD). Here, methods for isolating, culturing and maintaining C. difficile vegetative cells and spores are described. These techniques necessitate an anaerobic chamber, which requires regular maintenance to ensure proper conditions for optimal C. difficile cultivation.
FAQs
Each stage prepares substrates for the next microbial group. Hydrolysis breaks complex organic matter into simpler compounds, acidogenesis produces intermediate products, and acetogenesis converts those products into compounds suitable for methanogenesis. This sequential coordination matters because disruption at an earlier stage can limit the substrates available to methanogenic archaea and reduce conversion of organic waste into biogas.
Methanogenic archaea carry out the final conversion step by transforming acetate and carbon compounds derived from hydrogen into methane. Their activity determines how successfully intermediates produced by earlier stages become a usable energy-containing gas. In a bioengineered reactor, maintaining conditions that support these archaea is therefore central to stable operation and methane recovery.
Temperature, pH, and retention time shape the environment in which the microbial consortium operates. Suitable values help the sequential microbial stages proceed consistently, whereas poorly controlled conditions can interfere with biological conversion and reduce methane yields. Monitoring these variables allows bioengineers to maintain process stability while balancing treatment performance, energy recovery, and the time material remains in the reactor.
A typical workflow places an organic feedstock, such as wastewater, animal manure, food waste, or other biomass, inside a sealed reactor. The material is retained while microbial stages convert its organic content, and operators control temperature, pH, and retention time. The process produces two principal outputs: biogas for energy recovery and nutrient-rich digestate for resource management.
Bioengineering applications include treatment of wastewater, animal manure, food waste, and other biomass. These feedstocks differ in origin but share organic material that microbial consortia can process without oxygen. Applying the same reactor principle to multiple waste streams can reduce waste volumes while producing biogas and digestate, linking pollution control with renewable-energy and nutrient-recovery goals.
The process supports circular resource management by recovering value from materials that would otherwise remain waste. Organic matter is converted into biogas, which provides an avenue for renewable energy recovery, while the remaining digestate retains nutrients. Process design and microbial monitoring can improve methane yields, reduce waste volumes, and connect waste treatment with simultaneous energy and nutrient recovery.