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Forskningsartikel2004Vetenskapligt granskad

Presence of potential ammonia oxidation (PAO) inhibiting substances in anaerobic digestion residues

Nyberg K, Sundh I, Johansson M, Schnurer A


This study investigates if anaerobic digestion residues contain substances with negative impact on microbial processes in soil. Effects of residues and organic extracts of residues were assessed with two soil bioassays-substrate induced respiration (SIR) and potential ammonia oxidation (PAO). Laboratory incubations were performed, and residues from two lab-scale digesters and seven full-scale digesters, at different application rates, were mixed into agricultural topsoil. Additions of intact, dried residues displayed negligible effects on SIR and PAO, indicating that total microbial biomass and ammonia oxidising populations (AOB) were not affected by the amendments. However, removal of inorganic and particulate constituents in the residues by the extraction procedure rendered some of them inhibitory to PAO. Thus, substances inhibiting AOB were present in the anaerobic digestion residues, although generally they had minor effects on heterotrophic soil microorganisms. (C) 2003 Elsevier B.V. All rights reserved

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Applied Soil Ecology
2004, Volym: 26, nummer: 2, sidor: 107-112 Utgivare: ELSEVIER SCIENCE BV