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Continuously-stirred Anaerobic Digester to Convert Organic Wastes into Biogas: System Setup and Basic Operation
Published on: July 13, 2012
New strategy for a suitable fast stabilization of the biomethanization performance
L A Fernández-Güelfo1, C J Alvarez-Gallego, D Sales Márquez
1Department of Chemical Engineering and Food Technology, University of Cadiz, Cadiz, Puerto Real, Spain. alberto.fdezguelfo@uca.es
Archaea (Vancouver, B.C.)
|November 30, 2012
Summary
This study presents a novel strategy to significantly reduce the start-up time for thermophilic anaerobic reactors treating organic solid waste. The new method shortens the process from 245 days to just 60 days, improving efficiency.
Area of Science:
- Environmental Science
- Biotechnology
- Chemical Engineering
Background:
- Conventional thermophilic anaerobic reactor start-up is lengthy, typically requiring 245 days.
- This involves sequential mesophilic and thermophilic stages with non-feeding periods for adaptation and stability.
- Long start-up times hinder the widespread adoption of anaerobic digestion for organic waste treatment.
Purpose of the Study:
- To introduce and evaluate a new, accelerated strategy for the start-up and stabilization of thermophilic anaerobic reactors.
- To significantly reduce the overall time required for reactor start-up and biomethanization performance stabilization.
- To demonstrate the effectiveness of this strategy in an anaerobic continuous stirred tank reactor (CSTR) treating the organic fraction of municipal solid waste (OFMSW).
Main Methods:
- The study employed a modified SEBAC technology for initial inoculum adaptation.
- The adapted inoculum was used to seed a thermophilic-dry operating anaerobic continuous stirred tank reactor (CSTR).
- The new strategy was compared against conventional methods requiring approximately 245 days.
Main Results:
- The novel start-up strategy successfully reduced the overall process time to 60 days.
- This represents a significant time saving compared to the conventional 245-day approach.
- The reactor achieved stable biomethanization performance within this accelerated timeframe.
Conclusions:
- A new, highly efficient strategy for thermophilic anaerobic reactor start-up has been developed and validated.
- This accelerated approach drastically cuts down the time needed for stable operation, making anaerobic digestion more practical.
- The modified SEBAC technology plays a crucial role in the rapid adaptation of inoculum, enabling faster system stabilization.
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