Publications

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Sommer, S. G. (2015). Predicting ammonia loss from field-applied manure: The ALFAM2 project. In I. Körner (Ed.), RAMIRAN 2015 - 16th International Conference Rural-Urban Symbiosis: Abstract book (pp. 84). Article TC-K TuTech Innovation. http://www.ramiran.net/doc15/RAMIRAN_2015%20Abstract%20book.pdf

Sommer, S. G. (2015). The importance of pH for ammonia emission from animal manure. In I. Körner (Ed.), RAMIRAN 2015 - 16th International Conference Rural-Urban Symbiosis: Abstract book (pp. 86). Article TC-O_02 TuTech Innovation. https://doi.org/http://www.ramiran.net/doc15/RAMIRAN_2015%20Abstract%20book.pdf

Vu, T. K. V., Vu, D. Q., Sommer, S. G. & Bruun, S. (2015). Life cycle assessment of biogas production in small-scale household digesters in Vietnam. Asian-Australasian Journal of Animal Sciences, 28(5), 716-729. https://doi.org/10.5713/ajas.14.0683

Bruun, S., Jensen, L. S., Vu Thi Khanh, V. & Sommer, S. G. (2014). Small-scale household biogas digesters: An option for global warming mitigation or a potential climate bomb? Renewable and Sustainable Energy Reviews, 33, 736-741. https://doi.org/10.1016/j.rser.2014.02.033

Croxatto Vega, G. C., ten Hoeve, M., Birkved , M., Sommer, S. G. & Bruun, S. (2014). Choosing co-substrates to supplement biogas production from animal slurry--a life cycle assessment of the environmental consequences. Bioresource Technology, 171, 410-420. https://doi.org/10.1016/j.biortech.2014.08.099

Hafner, S. D., Franco, R. B., Kung, L., Rotz, C. A. & Mitloehner, F. (2014). Potassium sorbate reduces production of ethanol and 2 esters in corn silage¹. Journal of Dairy Science, 97(12), 7870-7878. https://doi.org/10.3168/jds.2014-8537

Petersen, V., Markfoged, R., Hafner, S. D. & Sommer, S. G. (2014). A new slurry pH model accounting for effects of ammonia and carbon dioxide volatilization on solution speciation. Nutrient Cycling in Agroecosystems, 100(2), 189-204. https://doi.org/10.1007/s10705-014-9637-6

Pham, C. H., Vu, C. C., Sommer, S. G. & Bruun, S. (2014). Factors Affecting Process Temperature and Biogas Production in Small-scale Rural Biogas Digesters during Winter in Northern Vietnam. Asian-Australasian Journal of Animal Sciences, 27(7), 1050-1056. https://doi.org/10.5713/ajas.2013.13534

Rotz, C. A., Montes, F., Hafner, S. D., Heber, A. J. & Grant, R. H. (2014). Ammonia emission model for whole farm evaluation of dairy production systems. Journal of Environmental Quality, 43(4), 1143-1158. https://doi.org/10.2134/jeq2013.04.0121

Sommer, S. G. (2014). Anaerobic digestion of pig manure fibers from full-scale commercial manure separation units. Biosystems Engineering, 123, 91-96.

Sommer, S. G. (2014). Anaerobic digestion of pig manure fibres from commercial pig slurry separation units. Biosystems Engineering, 123, 91-96. https://doi.org/10.1016/j.biosystemseng.2014.05.006

Sommer, S. G. (2014). Biogas Production from Vinasse: Effects of By-Products of Livestock and Sugar-Beet Production as Co-Substrates. In Proceedings of the 22nd European Biomass Conference and Exhibition, Hamburg, Germany http://www.etaflorence.it/proceedings/

Sommer, S. G. (2014). Effect of anaerobic digestion of vinasse on mitigation of greenhouse gas emission. Poster session presented at XI Simposio Latinoamericano de Digestión Anaerobia, La Habana, Cuba.

Sommer, S. G. (2014). Korean-Danish joint research cooperation – Sharing experiences on environmentally friendly bioenergy production. Abstract from 7th EU-Korea Conference on Science and Technology, Vienna, Austria.

Sommer, S. G. (2014). Predicting Methane Production in Simple and Unheated Biogas Digesters at low temperatures. Applied Energy, 136, 1-6.

Sommer, S. G. (2014). Residual biochemical methane potential of concentrated digestate from full-scale biogas plants. Fuel, 132, 44-46. https://doi.org/10.1016/j.fuel.2014.04.062

Sommer, S. G. (2014). Thermic model to predict biogas production in unheated fixed-dome digesters buried in the ground. Environmental Science & Technology, 48(6), 3253−3262. https://doi.org/10.1021/es403215w

Waldrip, H. M., Rotz, C. A., Hafner, S. D., Todd, R. W. & Cole, N. A. (2014). Process-based modeling of ammonia emission from beef cattle feedyards with the integrated farm systems model. Journal of Environmental Quality, 43(4), 1159-1168. https://doi.org/10.2134/jeq2013.09.0354

Christensen, M. L., Christensen, K. V. & Sommer, S. G. (2013). Solid-Liquid Separation of Animal Slurry. In Animal Manure Recycling: Treatment and Management (pp. 105-130). Wiley-Interscience. https://doi.org/10.1002/9781118676677.ch7

Feilberg, A. & Sommer, S. G. (2013). Ammonia and Malodorous Gases: Sources and Abatement Technologies. In S. G. Sommer, M. L. Christensen, T. Schmidt & L. S. Jensen (Eds.), Animal Manure Recycling: Treatment and Management (pp. 153-176). John Wiley and Sons, Ltd..

Hafner, S. D., Howard, C., Muck, R. E., Franco, R. B., Montes, F., Green, P. G., Mitloehner, F., Trabue, S. L. & Rotz, C. A. (2013). Emission of volatile organic compounds from silage: Compounds, sources, and implications. Atmospheric Environment, 77, 827-839. https://doi.org/10.1016/j.atmosenv.2013.04.076

Hafner, S. D., Montes, F. & Alan Rotz, C. (2013). The role of carbon dioxide in emission of ammonia from manure. Atmospheric Environment, 66, 63-71. https://doi.org/10.1016/j.atmosenv.2012.01.026

Jensen, L. S. & Sommer, S. G. (2013). Manure organic matter - Characteristics and microbial transformations: Chapter 5. In S. Gjedde Sommer, M. Lykkegaard Christensen, T. Schmidt & L. S. Jensen (Eds.), Animal Manure Recycling: Treatment and Management (pp. 67-90). John Wiley & Sons, Ltd. https://doi.org/10.1002/9781118676677.ch5

Jin Mi , T., Ward, A. J., Pedersen, L., Løkke, M. M., Qu, H. & Sommer, S. G. (2013). Near Infrared Reflectance Spectroscopy (NIRS) for rapid determination of Biochemical Methane Potential of plant biomass. Applied Energy, 116, 52-57. https://doi.org/10.1016/j.apenergy.2013.11.006

Sommer, S. G. (2013). Ammonia volatilisation from livestock slurries and mineral fertilisers. Syddansk Universitetsforlag.

Sommer, S. G. (2013). Ammonia volatilization from livestock slurries and mineral fertilizers.

Sommer, S. G. (2013). Animal manure - From Waste to raw materials and goods. In S. G. Sommer, M. L. Christensen, T. Schmidt & L. S. Jensen (Eds.), Animal Manure Recycling - Treatment and Management (1 ed., Vol. 1, pp. 1-4). John Wiley & Sons Ltd.

Sommer, S. G., Christensen, M. L., Schmidt, T. & Jensen, L. S. (2013). Animal Manure Recycling: Treatment and Management. Wiley-Interscience. https://doi.org/10.1002/9781118676677

Sommer, S. G. (2013). Animal production and animal manure management. In S. G. Sommer, M. L. Christensen, T. Schmidt & L. S. Jensen (Eds.), Animal manure recycling - Treatment and management (1 ed., Vol. 1, pp. 5-23). John Wiley & Sons Ltd.

Sommer, S. G., Ward, A. J. & Leahy, J. J. (2013). Bioenergy Production. In Animal Manure Recycling: Treatment and Management (pp. 237-269). Wiley-Interscience. https://doi.org/10.1002/9781118676677.ch13

Sommer, S. G. (2013). Biogas from beet pulp and source separated household waste- Energy production and Greenhouse gas Reduction. http://dce-conference.au.dk/fileadmin/dce-conference.au.dk/Abstract_Book_Final.pdf

Sommer, S. G. (2013). Decision Support for the Construction of Farm-Scale Biogas Digesters in Developing Countries with Cold Seasons. Energies, 6(10), 5314-5332. https://doi.org/10.3390/en6105314

Sommer, S. G. (2013). Eco-friendly and efficient management of solid manure: (Chapter 8). . In A. Aland & T. Banhazi (Eds.), Livestock housing Wageningen Academic Publishers. https://doi.org/10.3920/978-90-8686-771-4

Sommer, S. G. (2013). Ecofriendly, hygienic and efficient management of solid animal manure. In Livestock housing: Modern management to ensure optimal health and welfare of farm animals (pp. 161-182). Wageningen Academic Publicers. https://doi.org/10.3920/978-90-8686-771-4

Sommer, S. G. & Feilberg, A. (2013). Gaseous Emissions of Ammonia and Malodorous Gases. In S. G. Sommer, M. L. Christensen, T. Schmidt & L. S. Jensen (Eds.), Animal Manure Recycling: Treatment and Management (pp. 131-151). John Wiley and Sons, Ltd..

Sommer, S. G., Clough, T. J., Chadwick, D. & Petersen, S. O. (2013). Greenhouse gas emissions from animal manures and technologies for their reduction. In Animal Manure Recycling: Treatment and Management (pp. 177-194)

Sommer, S. G. (2013). Manure characterisation and inorganic chemistry. In S. G. Sommer, M. L. Christensen, T. Schmidt & L. S. Jensen (Eds.), Animal Manure – Treatment and Management (1 ed., Vol. 1, pp. 41-63). John Wiley & Sons Ltd.

Sommer, S. G. (2013). Near Infrared Reflectance Spectroscopy for rapid determination of Biochemical Methane Potential of plant biomass. In ICNIRS 2013 - 16th International Conference on Near Infrared Spectroscopy, La Grande-Motte ICNIRS.

Sommer, S. G. (2013). Online measurement of methane potentials and anaerobic degradability in biogas production and green house gas emission. In 2013 Korean-Danish Strategic Research Cooperation Workshop, Seoul South Korea Korean-Danish Strategic Research Cooperation.

Sommer, S. G. (2013). Rapid determination of Biochemical Methane Potential (BMP) in anaerobic digestion using Near Infrared Reflectance Spectroscopy (NIRS). In EU-Korea Conference on Science and Technology (EKC), Brighton EKC.

Sommer, S. G., Oenema, O., Matsunaka, T. & Jensen, L. S. (2013). Regulation of animal manure management. Chapter 3 . In S. Gjedde Sommer, M. L. Christensen, T. Schmidt & L. S. Jensen (Eds.), Animal Manure – Treatment and Management (First Edition ed.). John Wiley & Sons Ltd. https://doi.org/10.1002/9781118676677;jsessionid=44AC77B289944BB81266A638B92599A5.f03t04

Sommer, S. G. (2013). Technologies and logistics for handling, transport and distribution of animal manures. In S. G. Sommer, M. L. Christensen, T. Schmidt & L. S. Jensen (Eds.), Animal Manure – Treatment and Management (1 ed., Vol. 1, pp. 211-234). John Wiley & Sons Ltd.

Sommer, S. G. (2013). Validation and Recommendation of Methods to Measure Biogas Production Potential of Animal Manure. Asian-Australasian Journal of Animal Sciences, 26(6), 864-873. https://doi.org/10.5713%2Fajas.2012.12623

Triolo, J. L., Ward, A. J., Pedersen, L. & Sommer, S. G. (2013). Characteristics of Animal Slurry as a Key Biomass for Biogas Production in Denmark. In M. D. Matovic (Ed.), Biomass Now - Sustainable Growth and Use InTech - Open Access Publisher. https://doi.org/10.5772/54424

Wnetrzak, R., Kwapinski, W., Peters, K., Sommer, S. G., Jensen, L. S. & Leahy, J. J. (2013). The influence of the pig manure separation system on the energy production potentials. Bioresource Technology, 136, 502-508. https://doi.org/10.1016/j.biortech.2013.03.001

Hafner, S. D., Montes, F. & Rotz, C. A. (2012). A mass transfer model for VOC emission from silage. Atmospheric Environment, 54, 134-140. https://doi.org/10.1016/j.atmosenv.2012.03.005

Hafner, S. D., Meisinger, J. J., Mulbry, W. & Ingram, S. K. (2012). A pH-based method for measuring gaseous ammonia. Nutrient Cycling in Agroecosystems, 92(2), 195-205. https://doi.org/10.1007/s10705-012-9481-5

Hansen, B. I., ten Hoeve, M. & Sommer, S. G. (2012). Regulering og tilskud styrer udbredelsen af nye teknologier. In Robust og bæredygtig bioenergi (pp. 6-7)

Rüdiger, M., Karnøe, P., Sommer, S. G. & Overgaard, K. (2012). Fra fossilt brændsel til vedvarende energi. In K. Overgaard, S. Gjedde Sommer, K. B. Christensen, D. L. Damkjær, L. K. Glenstrup, S. Hohn, M. J. Larsen & M. Machholm (Eds.), BIOTEK 2: Bioenergi, Lægemidler, Fødevareingredienser, Drikkevand. (pp. 6-45). L&R Uddannelse.

Sommer, S. G. (2012). Banebrydende dansk bioteknologi. In S. D. Emkjær (Ed.), BIOTEK 2 - Anvendt bioteknologi (pp. 92-121). Lindhardt & Ringhof.

Displaying results 151 to 200 out of 569

Revised 18.03.2026

Sasha D. Hafner