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Monitoring of Ammonia in Biogas
Author(s) -
Wünscher Heike,
Frank Thomas,
Cyriax Andrea,
Tobehn-Steinhäuser Ingo,
Ortlepp Thomas,
Kirner Thomas
Publication year - 2020
Publication title -
chemical engineering and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.403
H-Index - 81
eISSN - 1521-4125
pISSN - 0930-7516
DOI - 10.1002/ceat.201900347
Subject(s) - ammonia , biogas , slurry , dielectric spectroscopy , electrical impedance , aqueous solution , ammonia production , waste management , chemistry , electrode , analytical chemistry (journal) , materials science , environmental science , environmental engineering , electrochemistry , electrical engineering , engineering , chromatography , organic chemistry
Abstract Ammonia content is an important factor, which has to be considered when optimizing the processes in a biogas plant. A measurement system for a continuous monitoring of ammonia has been constructed, which can be placed in the gas room above the digester. The monitoring is based on the measurement of the electrical impedance. In this system, a condensate is generated on the surface of an interdigital electrode so that the whole stray field is covered by the condensate. For determining the ammonia content, impedance spectroscopy of these drops is performed. The ammonia of the biogas causes a decrease in the impedance in comparison to a pure aqueous condensate. A first evaluation of this measurement system using artificial slurries has been performed.