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Determination of Nitrogen and Sulphur Mineralization in Batch and Semi-Continuous Anaerobic Digestion Using an Artificial Fiber Bag Technique

Mortensen, J.R.; Ward, A.J.; Weisbjerg, M.R.; Hafner, S.D. and Møller, H.B. (2021) Determination of Nitrogen and Sulphur Mineralization in Batch and Semi-Continuous Anaerobic Digestion Using an Artificial Fiber Bag Technique. Energies, 14, p. 4205.

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Summary

In the biogas industry, feedstock plans are used to estimate methane production and nutrient content in the digestate, however, these predictions do not consider the mineralized nitrogen fraction of the feedstock, which is useful when determining the quality of the digestate. In this study, the artificial fiber bag technique, which is commonly used to study feedstock degradation in ruminants, was implemented in anaerobic digestion to quantify mineralization of N and S. The artificial fiber bags were used to enclose substrates but with access to inoculum because of small pores in the bags, thereby enabling digestion. The content of the bags was analyzed before and after digestion to quantify residual mass as well as N and S concentration in the substrate. The method was validated through batch anaerobic digestion of a single substrate with and without bags, where the bags showed little influence on methane production and degradation. Semi-continuous anaerobic digestion experiments showed higher substrate degradation and higher N and S release at thermophilic conditions using four different types of feedstocks and proved useful for solid feedstocks but less so for semi-solid feedstock. For N, most of the mineralization occurred during the first 15 days over a trial of 30 days.


EPrint Type:Journal paper
Keywords:anaerobic digestion; artificial fiber bag technique; mineralization; nitrogen; sulphur; method validation
Agrovoc keywords:
Language
Value
URI
English
biogas
http://aims.fao.org/aos/agrovoc/c_9262
English
mineralization
http://aims.fao.org/aos/agrovoc/c_15999
English
nitrogen
http://aims.fao.org/aos/agrovoc/c_5192
English
sulfur
http://aims.fao.org/aos/agrovoc/c_7514
Subjects: Farming Systems > Buildings and machinery
Farming Systems > Farm nutrient management
Research affiliation: Denmark > Organic RDD 4 > ClimOptic
DOI:10.3390/en14144205
Deposited By: Sørensen, Senior scientist Peter
ID Code:44132
Deposited On:05 Jul 2022 13:41
Last Modified:05 Jul 2022 13:41
Document Language:English
Status:Published
Refereed:Peer-reviewed and accepted

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