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Applied Microbiology and Biotechnology

, Volume 38, Issue 4, pp 560–564 | Cite as

Thermophilic anaerobic digestion of livestock waste: the effect of ammonia

  • I. Angelidaki
  • B. K. Ahring
Environmental Biotechnology

Abstract

Ammonia concentrations of 4 g N/l or more inhibited thermophilic digestion of cattle manure. A stable digestion of cattle manure could be maintained with ammonia concentrations up to 6 g N/l after 6 months of operation. However, the methane yield was reduced and the concentration of volatile fatty acids increased from 1 to 3 g/l as acetate, compared to controls with an ammonia concentration of 2.5 g N/l. The temporary strong inhibition following an one-step increase in ammonia concentration was reduced by applying a gradual increase. The specific methanogenic activity of ammonia-inhibited reactors (6 g N/l) with acetate or hydrogen as substrate was reduced by 73 and 52%, respectively. Tests of ammonia toxicity on the acetate- and hydrogen-utilizing populations showed a higher sensitivity of the aceticlastic compared to the hydrogenotrophic methanogens; the specific growth rate for the aceticlastic methanogens was halved at ammonia concentrations of 3.5 g N/l, compared to 7 g N/l for the hydrogenotrophic methanogens.

Keywords

Methane Manure Specific Growth Specific Growth Rate Anaerobic Digestion 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag 1993

Authors and Affiliations

  • I. Angelidaki
    • 1
  • B. K. Ahring
    • 1
  1. 1.The Anaerobic Microbiology/Biotechnology Research Group, Department of BiotechnologyThe Technical University of DenmarkLyngbyDenmark

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