Publications

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Hafner, S. D., Sommer, S. G., Petersen, V. & Markfoged, R. (2017). Effects of carbon dioxide hydration kinetics and evaporative convection on pH profile development during interfacial mass transfer of ammonia and carbon dioxide. Heat and Mass Transfer, 53(4), 1335-1342. https://doi.org/10.1007/s00231-016-1910-6

Pilar Bernal, M., Sommer, S. G., Chadwick, D., Qing, C., Guoxue, L. & Michel Jr., F. C. (2017). Current Approaches and Future Trends in Compost Quality Criteria for Agronomic, Environmental, and Human Health Benefits. Advances in Agronomy, 144, 143-233. https://doi.org/10.1016/bs.agron.2017.03.002

Sommer, S. G. (2017). Biogas production from steer manures in Vietnam: Effects of feed supplements and tannin contents. Waste Management, 69, 492-497. https://doi.org/10.1016/j.wasman.2017.08.002

Sommer, S. G. (2017). Industrial wastewater for biogas production: Use of tannery wastewater as an alternative substrate and a pre-treatment medium.

Sommer, S. G., Clough, T. J., Balaine, N., Hafner, S. D. & Cameron, K. C. (2017). Transformation of organic matter and the emissions of methane and ammonia during storage of liquid manure as affected by acidification. Journal of Environmental Quality, 46(3), 514-521. https://doi.org/10.2134/jeq2016.10.0409

Hafner, S., Pedersen, S. V. & Sommer, S. G. (2016). The ALFAM2 project: Predicting ammonia loss from field-applied manure. In 16th International Conference on Rural-Urban Symbiosis (pp. 289-292)

Katz, J., Hafner, S. D. & Donovan, T. (2016). Assessment of Error Rates in Acoustic Monitoring with the R package monitoR. Bioacoustics - the International Journal of Animal Sound and its Recording, 25(2), 177-196. https://doi.org/10.1080/09524622.2015.1133320

Katz, J., Hafner, S. D. & Donovan, T. (2016). Tools for automated acoustic monitoring within the R package monitoR. Bioacoustics - the International Journal of Animal Sound and its Recording, 25(2), 197-210.

Pedersen, S. V., Marti-Herrero, J., Singh, A. K., Sommer, S. G. & Hafner, S. (2016). A new software tool for predicting methane emission from manure storage facilities. In International Conference on Agricultural Engineering https://www.researchgate.net/publication/319133598_A_new_software_tool_for_predicting_methane_emission_from_manure_storage_facilities

Pedersen, S. V., Marti-Herrero, J., Sommer, S. G. & Hafner, S. (2016). Evaluation of a Simple Heat Transfer-and Biogas Production Model for Anaerobic Digesters of Various Designs. In 24th European Biomass Conference Exhibition

Petersen, S. O., Hutchings, N. J., Hafner, S. D., Sommer, S. G., Hjorth, M. & Jonassen, K. (2016). Ammonia abatement by slurry acidification: A pilot-scale study of three finishing pig production periods. Agriculture, Ecosystems & Environment, 216, 258-268. https://doi.org/10.1016/j.agee.2015.09.042

Petersen, S. O., Olsen, A. B., Elsgaard, L., Triolo, J. M. & Sommer, S. G. (2016). Estimation of Methane Emissions from Slurry Pits below Pig and Cattle Confinements. P L o S One, 11(8), Article e0160968. https://doi.org/10.1371/journal.pone.0160968

Rennuit, C. & Hafner, S. (2016). Interstage treatment for increasing methane production from recalcitrant biomass. In 16th International Conference on Rural-Urban Symbiosis (pp. 535-538) http://ramiran2015.de/wp-content/uploads/2016/05/RAMIRAN_2015-Proceedings-Book.pdf

Sommer, S. G., Hamelin, L., Olesen, J. E., Montes, F., Jia, W., Qing, C. & Triolo, J. M. (2016). Agricultural waste biomass: Chapter 3. In E. Lakovou, D. Bochtis, D. Vlachos & D. Aidonis (Eds.), Supply Chain Management for Sustainable Food Networks John Wiley & Sons.

Sommer, S. G. (2016). A review of ammonia emission measured using wind tunnels compared with micrometeorological techniques. Soil Use and Management, 32(Suppl 1), 101-8. https://doi.org/10.1111/sum.12209

Sommer, S. G. (2016). Influence of freezing/thawing and drying/milling on Biochemical Methane Potential. Environmental Engineering and Management Journal, 15(7), 1533-1536. http://www.ecozone.ro/reviste.php?revista=21&volum=60&numar=182&RID=27079

Sommer, S. G. (2016). The importance of pH for ammonia emission from animal manure. In I. Körner (Ed.), RAMIRAN 2015: Proceeding of the 16th International Conference Rural-Urban Symbiosis (pp. 297-300). TuTech Verlag . http://ramiran2015.de/wp-content/uploads/2016/05/RAMIRAN_2015-Proceedings-Book.pdf

Bernal, M. P., Sommer, S. G. & Chadwick, D. (2015). Compost quality criteria for safe and sustainable agriculture. In the International Composting Conference

Hafner, S. D., Windle, M., Merrill, C., Smith, M. L., Franco, R. B. & Kung, L. (2015). Effects of potassium sorbate and Lactobacillus plantarum MTD1 on production of ethanol and other volatile organic compounds in corn silage. Animal Feed Science and Technology, 208, 79-85. https://doi.org/10.1016/j.anifeedsci.2015.07.007

Hafner, S. D., Pedersen, S. V., Sommer, S. G. & Pacolski, A. (2015). Predicting ammonia loss from field-applied manure - The ALFAM2 project. In I. Körner (Ed.), Proceedings of the 16th International RAMIRAN Conference TuTech Verlag .

Hafner, S. D., Rennuit, C., Triolo, J. M. & Richards, B. K. (2015). Validation of a simple gravimetric method for measuring biogas production in laboratory experiments. Biomass and Bioenergy, 83, 297-301. https://doi.org/10.1016/j.biombioe.2015.10.003

Loyon, L., Burton, C. H., Misselbrook, T. H., Webb, J., Philippe, F. X., Aguilar, M., Doreau, M., Hassouna, M., Veldkamp, T., Dourmad, J. Y., Bonmati, A., Grimm, E. & Sommer, S. G. (2015). Best available technology for European livestock farms: Availability, effectiveness and uptake. Journal of Environmental Management, 166, 1-11. https://doi.org/10.1016/j.jenvman.2015.09.046

Sommer, S. G., Hamelin, L., Olesen, J. E., Montes, F., Wei, J., Qing, C. & Triolo, J. M. (2015). Agricultural waste biomass. In E. Lakovou, D. Bochtis, D. Vlachos & D. Aidonis (Eds.), Supply Chain Management for Sustainable Food Networks (pp. 67-98). John Wiley & Sons. https://doi.org/10.1002/9781118937495

Sommer, S. G., Hamelin, L., Olesen, J. E., Montes, F., Jia, W., Chen, Q. & Triolo, J. M. (2015). Agricultural waste biomass. In Supply Chain Management for Sustainable Food Networks (pp. 67-106). Wiley. https://doi.org/10.1002/9781118937495.ch3

Sommer, S. G. (2015). Biogas Production from Vietnamese Animal Manure, Plant Residues and Organic Waste: Influence of Biomass Composition on Methane Yield. Asian-Australasian Journal of Animal Sciences, 28(2), 280-289. https://doi.org/10.5713/ajas.14.0312.

Sommer, S. G. (2015). Biogas production within the bioethanol production chain: use of co-substrates for anaerobic digestion of sugar beet vinasse. Bioresource Technology, 190, 227–234.

Sommer, S. G. (2015). Comprehensive microbial analysis of combined mesophilic anaerobic-thermophilic aerobic process treating high-strength food wastewater. Water Research, 73, 291-303. https://doi.org/10.1016/j.watres.2015.01.038

Sommer, S. G. (2015). Measurements of ammonia emission from grazing animals. Abstract from Methods for estimating ammonia losses from organic pig production in free range systems and in barns with outdoor pens, Hovborg , Denmark.

Sommer, S. G. (2015). New tool for improving management of biogas digesters: A heat transfer- and biogas production model for anaerobic digestion. In I. Körner (Ed.), RAMIRAN 2015 - 16th International Conference Rural-Urban Symbiosis: Abstract Book (pp. 140). Article TD-O_12 TuTech Innovation.

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

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

Displaying results 101 to 150 out of 544

Revised 16.01.2025

Sasha D. Hafner