Comprehensive monitoring of a biogas process during pulse loads with ammonia

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• 作者：Emiliano Bruni ; Alastair James Ward ; Morten K?cks ; Anders Feilberg ; Anders Peter S. Adamsen ; Anders Peter Jensen ; Allan K. Poulsen
• 关键词：Biogas monitoring ; Anaerobic digestion ; Imbalance ; Ammonia ; Chemometrics
• 刊名：Biomass and Bioenergy
• 出版年：2013
• 出版时间：September, 2013
• 年：2013
• 卷：56
• 期：Complete
• 页码：211-220
• 全文大小：1853 K

文摘

A thermophilic pilot scale anaerobic digester treating chicken litter was subjected to pulse loads of ammonia of increasing concentration. A micro gas chromatograph (¦Ì-GC) measured CO₂, CH₄, N₂, H₂ and H₂S in the biogas. In the liquid, NH₄-N was measured manually, volatile fatty acids (VFA) were measured manually and with Near Infrared Spectroscopy (NIRS). Within the first 7-24?h after the pulse, the concentrations of iso-butyric and iso-valeric acid increased rapidly and were the best indicators of process stress due to ammonia pulses, confirmed by multivariate analysis. NIRS was not capable of accurate prediction of VFA iso-forms most likely due to low concentrations. Propionic acid was persistent. The ammonia pulses caused an overall decrease of biogas production. The biogas composition was not a good indicator of imbalances; little correlation with VFA measurements was observed.