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Anaerobic Digesters--3 hours, 0.3 CEU

Anaerobic Digesters reviews five areas of concern related to the microbiology and successful operation of anaerobic digesters. These areas are:

1. the bacteria involved in the degradation of soluble, colloidal, and particulate BODs
2. acceptable operating conditions
3. BODs compatible for anaerobic digestion
4. upset conditions commonly experienced with anaerobic digesters
5. troubleshooting and process control measures

Bacteria reviewed include the methane-formers or methanogens, and the degradation of BODs addresses anaerobic activity and methane production. Significant operational conditions requiring periodic monitoring that are addressed include:

1. alkalinity and pH
2. major and minor nutrients
3. temperature
4. toxicity
5. volatile acids

Causes and corrective operational measures for foam and scum production, a common operational problem experienced with many anaerobic digesters, are presented. A review of digester seeding and start-up, types of digesters, and the benefits of anaerobic digesters is also provided.

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