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

Biogas production from undiluted chicken manure and maize silage: a study of ammonia inhibition in high solids anaerobic digestion
Biogas production from undiluted chicken manure and maize silage: a study of ammonia inhibition in high solids anaerobic digestion
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 0.309 L CH4g?1 volatile solids (VS) was achieved but only at lower %CM. Above a critical threshold for total ammonia nitrogen (TAN), estimated at 7 g N L?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 9 g N L?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.
ammonia inhibition, chicken manure, mesophilic anaerobic digestion, methanogenic pathway, isotope tracing
0960-8524
1215-1223
Sun, Chen
73141893-cc41-415d-ab99-4f9f9822c90b
Cao, Weixing
90039ddb-3b4a-4d7e-bbb6-05e5b86502b8
Banks, Charles J.
5c6c8c4b-5b25-4e37-9058-50fa8d2e926f
Heaven, Sonia
f25f74b6-97bd-4a18-b33b-a63084718571
Liu, Ronghou
f0b96144-766a-453a-a9d9-daeef6dfaf1b
Sun, Chen
73141893-cc41-415d-ab99-4f9f9822c90b
Cao, Weixing
90039ddb-3b4a-4d7e-bbb6-05e5b86502b8
Banks, Charles J.
5c6c8c4b-5b25-4e37-9058-50fa8d2e926f
Heaven, Sonia
f25f74b6-97bd-4a18-b33b-a63084718571
Liu, Ronghou
f0b96144-766a-453a-a9d9-daeef6dfaf1b

Sun, Chen, Cao, Weixing, Banks, Charles J., Heaven, Sonia and Liu, Ronghou (2016) Biogas production from undiluted chicken manure and maize silage: a study of ammonia inhibition in high solids anaerobic digestion. Bioresource Technology, 218, 1215-1223. (doi:10.1016/j.biortech.2016.07.082).

Record type: Article

Abstract

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 0.309 L CH4g?1 volatile solids (VS) was achieved but only at lower %CM. Above a critical threshold for total ammonia nitrogen (TAN), estimated at 7 g N L?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 9 g N L?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.

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More information

Accepted/In Press date: 19 July 2016
e-pub ahead of print date: 21 July 2016
Published date: October 2016
Keywords: ammonia inhibition, chicken manure, mesophilic anaerobic digestion, methanogenic pathway, isotope tracing
Organisations: Water & Environmental Engineering Group

Identifiers

Local EPrints ID: 399183
URI: https://eprints.soton.ac.uk/id/eprint/399183
ISSN: 0960-8524
PURE UUID: 3185cb97-c99b-4350-9c77-2e5b06d791d5

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Date deposited: 08 Aug 2016 15:42
Last modified: 03 Dec 2019 06:36

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