Details

Autor(en) / Beteiligte

• Sun, Chen
• Cao, Weixing
• Banks, Charles J.
• Heaven, Sonia
• Liu, Ronghou

Titel

Biogas production from undiluted chicken manure and maize silage: A study of ammonia inhibition in high solids anaerobic digestion

Ist Teil von

• Bioresource technology, 2016-10, Vol.218, p.1215-1223

Ort / Verlag

England: Elsevier Ltd

Erscheinungsjahr

2016

Quelle

MEDLINE

Beschreibungen/Notizen

• [Display omitted] •Stable co-digestion of up to 20% chicken manure on VS basis with maize silage.•Threshold and total inhibition of biogas production occurred at 7 and 9gNL−1.•Dominant hydrogenotrophic methanogenesis reverts to acetoclastic on lower N input.•Loss of methanogenesis led to total VFA>60gL−1 before buffering failed.•Sub-optimal solids breakdown as a result of multi-inhibition. The feasibility of co-digestion of chicken manure (CM) and maize silage (MS) without water dilution was investigated in 5-L digesters. Specific methane production (SMP) of 0.309LCH4g−1 volatile solids (VS) was achieved but only at lower %CM. Above a critical threshold for total ammonia nitrogen (TAN), estimated at 7gNL−1, VFA accumulated with a characteristic increase in acetic acid followed by its reduction and an increase in propionic acid. During this transition the predominant methanogenic pathway was hydrogenotrophic. Methanogenesis was completely inhibited at TAN of 9gNL−1. The low digestibility of the mixed feedstock led to a rise in digestate TS and a reduction in SMP over the 297-day experimental period. Methanogenesis appeared to be failing in one digester but was recovered by reducing the %CM. Co-digestion was feasible with CM ⩽20% of feedstock VS, and the main limiting factor was ammonia inhibition.