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Ammonia inhibition in anaerobic digestion: A review

Paper ID Volume ID Publish Year Pages File Format Full-Text
34741 45042 2013 11 PDF Available
Title
Ammonia inhibition in anaerobic digestion: A review
Abstract

•Ammonia is a commonly encountered inhibitor in anaerobic digestion systems.•Ammonium ion (NH4+) and free ammonia (NH3) are directly and indirectly inhibitory.•Process inhibition is also related to the pH, temperature, and concentrations of ammonium and ammonia.•Recovery of anaerobic digestion systems after ammonia inhibition is possible.

Even though ammonia is an essential nutrient for bacterial growth, it may inhibit methanogenesis during anaerobic digestion process if it is available at high concentrations. Therefore, ammonia is regarded as a potential inhibitor during anaerobic digestion, particularly when dealing with complex type of substrates such as manure or the organic fraction of municipal solid waste (OFMSW). Ammonia is produced through biological degradation of nitrogenous matter. Ammonium ion (NH4+) and free ammonia (NH3) are the two principal forms of inorganic ammonia nitrogen. Both forms can directly and indirectly cause inhibition in an anaerobic digestion system. Particularly, free ammonia (FAN) is a powerful inhibitor in an anaerobic digester above threshold concentrations. Process inhibition is related to the particular characteristics of the substrate to be anaerobically digested, pH, process temperature (mesophilic or thermophilic), type of the seed sludge (inoculum), the reactor configuration and to the concentrations of ammonium and ammonia. In this paper, ammonia inhibition in anaerobic digestion systems and the recovery efforts after inhibition are discussed. Furthermore, the impacts of ammonia inhibition on the microbial population available in anaerobic digesters, namely bacteria and Archaea, are also evaluated in detail.

Keywords
Ammonia; Anaerobic digestion; Inhibition; Recovery
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Publisher
Database: Elsevier - ScienceDirect
Journal: Process Biochemistry - Volume 48, Issues 5–6, May–June 2013, Pages 901–911
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
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Full-text PDF Download
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