Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 423721
Title A pH-based control of ammonia in biogas during anaerobic digestion of artificial pig manure and maize silage
Author(s) Strik, D.P.B.T.B.; Domnanovich, A.M.; Braun, R.; Holubar, P.
Source Process Biochemistry 41 (2006)6. - ISSN 1359-5113 - p. 1235 - 1238.
DOI http://dx.doi.org/10.1016/j.procbio.2005.12.008
Department(s) Sub-department of Environmental Technology
WIMEK
Publication type Refereed Article in a scientific journal
Publication year 2006
Keyword(s) precipitation - inhibition - struvite - hydrogen - removal - acetate - methane
Abstract The purposes of this study were to prove that ammonia can be present in biogas from anaerobic digestion and to control this ammonia by reducing the reactor pH. Ammonia containing biogas was produced for a period of more than 100 days, with a maximum of 332 ppm. Especially during periods of high free ammonia concentrations in the reactor was ammonia present in biogas. The free ammonia was effectively reduced to less than the inhibition level by pH-based control and the ammonia in biogas concentration was reduced to 9 ppm. Simultaneously the CH4-yield was severely reduced. A pH-based control of ammonia in biogas with a satisfactory biogas production was thus so far proven not to be achievable. In the carrying out this study it was shown that high ammonia concentrations lead to a range of problems: process inhibition, decreased COD removal efficiency, reduced biogas production, malodour and a poor biogas quality that requires treatment.
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