ANAEROBIC DIGESTION OF SWINE MANURE: INHIBITION BY AMMONIA

A stable anaerobic degradation of swine manure with ammonia concentration of 6 g-N/litre was obtained in continuously stirred tank reactors with a hydraulic retention time of 15 days, at four different temperatures. Methane yields of 188, 141, 67 and 22 ml-CH 4/g-VS were obtained at 37, 45, 55 and 6...

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Published in:Water research (Oxford) 1998, Vol.32 (1), p.5-12
Main Authors: HANSEN, KAARE HVID, ANGELIDAKI, IRINI, AHRING, BIRGITTE KIÆR
Format: Article
Language:English
Subjects:
Agriculture, rearing and food industries wastes
ammonia
ammonia inhibition
anaerobic degradation
anaerobic digestion
Applied sciences
biogas
Biological and medical sciences
Biological treatment of sewage sludges and wastes
Biotechnology
Environment and pollution
Exact sciences and technology
Fundamental and applied biological sciences. Psychology
Industrial applications and implications. Economical aspects
inhibition
mathematics and statistics
methane
methane production
pig manure
Pollution
swine manure
temperature
Wastes
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Summary:A stable anaerobic degradation of swine manure with ammonia concentration of 6 g-N/litre was obtained in continuously stirred tank reactors with a hydraulic retention time of 15 days, at four different temperatures. Methane yields of 188, 141, 67 and 22 ml-CH 4/g-VS were obtained at 37, 45, 55 and 60°C, respectively. The yields were significantly lower than the potential biogas yield of the swine manure used (300 ml-CH 4/g-VS). A free ammonia concentration of 1.1 g-N/litre or more was found to cause inhibition in batch cultures at pH 8.0 (reactor pH), and higher free ammonia concentrations resulted in a decreased apparent specific growth rate. Batch experiments with various mixtures of swine and cattle manure showed that the biogas process was inhibited when the swine-to-cattle manure ratio was higher than 25:75, corresponding to a free ammonia concentration of approximately 1.1 g-N/litre. Inhibition of the biogas process and, thereby, a reduction of the methane yield followed a four-stage pattern: below a threshold of 1.1 g-N/litre free ammonia, the process was uninhibited; over this concentration, inhibition occurred, forming first a phase with an initial inhibition, then a plateau and then an inhibition stage where the apparent specific growth rate decreased with increasing concentrations of free ammonia. © 1998 Elsevier Science Ltd. All rights reserved
ISSN:0043-1354
1879-2448
DOI:10.1016/S0043-1354(97)00201-7