Mathis von Ahnen

2023

Removal of dissolved organic matter from the woodchip bioreactor start-up by foam fractionation

von Ahnen, M., Stedmon, C. A. & Hambly, A. C., 2023, In: Water Science and Technology. 87, 6, p. 1454-1464 11 p.

Research output: Contribution to journal › Journal article › Research › peer-review

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2022

Microbial communities in full-scale woodchip bioreactors treating aquaculture effluents

Aalto, S. L., Suurnäkki, S., von Ahnen, M., Tiirola, M. & Pedersen, P. B., 2022, In: Journal of Environmental Management. 301, 7 p., 113852.

Research output: Contribution to journal › Journal article › Research › peer-review

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2021

Effectiveness of denitrifying bioreactors on water pollutant reduction from agricultural areas

Christianson, L., Cooke, R., Hay, C., Helmers, M., Feyereisen, G., Ranaivoson, A., McMaine, J., McDaniel, R., Rosen, T., Puer, W., Schipper, L., Dougherty, H., Robinson, R., Layden, I., Irvine-Brown, S., Manca, F., Dhaese, K., Nelissen, V. & von Ahnen, M., 2021, In: American Society of Agricultural and Biological Engineers. Transactions. 64, 2, p. 641-658 18 p.

Research output: Contribution to journal › Journal article › Research › peer-review

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Effect of different C/N ratios and hydraulic retention times on denitrification in saline, recirculating aquaculture system effluents

von Ahnen, M., Dalsgaard, J. & Pedersen, P. B., 2021, In: Aquacultural Engineering. 94, 8 p., 102170.

Research output: Contribution to journal › Journal article › Research › peer-review

Environmentally friendly use of woodchip bioreactors in aquaculture

von Ahnen, M., Michelsen, K. & Pedersen, P. B., 2021, Kgs. Lyngby, Denmark: DTU Aqua. 43 p. (DTU Aqua-rapport; No. 383-2021).

Research output: Book/Report › Report › Research

Open Access

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Formaldehyde degradation in denitrifying woodchip bioreactors: Effects of temperature, concentration and hydraulic retention time

von Ahnen, M., Pedersen, L.-F. & Pedersen, P. B., 2021, In: Aquacultural Engineering. 95, 10 p., 102199.

Research output: Contribution to journal › Journal article › Research › peer-review

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Nutrient removal in a slow-flowing constructed wetland treating aquaculture effluent

Dalsgaard, J., von Ahnen, M. & Pedersen, P. B., 2021, In: Aquaculture Environment Interactions. 13, p. 363-376 14 p.

Research output: Contribution to journal › Journal article › Research › peer-review

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2020

Improving denitrification in an aquaculture wetland using fish waste - a case study

von Ahnen, M., Pedersen, P. B. & Dalsgaard, J., 2020, In: Ecological Engineering. 143, 105686.

Research output: Contribution to journal › Journal article › Research › peer-review

Nitrate removal microbiology in woodchip bioreactors: A case-study with full-scale bioreactors treating aquaculture effluents

Aalto, S. L., Suurnäkki, S., Siljanen, H. M. P., von Ahnen, M., Pedersen, P. B. & Tiirola, M., 2020, In: Science of the Total Environment. 723, 9 p., 138093.

Research output: Contribution to journal › Journal article › Research › peer-review

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47 Downloads (Pure)

2019

Addressing unsolved questions regarding denitrifying woodchip bioreactor operation at RAS

von Ahnen, M. & Pedersen, P. B., 2019, 5th NordicRAS Workshop on Recirculating Aquaculture Systems. Berlin, Germany, 7-8 October 2019: Book of Abstracts. Dalsgaard, J. (ed.). Technical University of Denmark, p. 50-50 (DTU Aqua-rapport; No. 350-2019).

Research output: Chapter in Book/Report/Conference proceeding › Conference abstract in proceedings › Research › peer-review

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End‐of‐Pipe rensning på dambrug

Pedersen, P. B., Dalsgaard, A. J. T., von Ahnen, M., Michelsen, K. & Thomsen, B., 2019, Dansk Akvakultur. 26 p. (Faglig rapport fra Dansk Akvakultur; No. 2019-3).

Research output: Book/Report › Report › Research

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Microbiology of woodchip bioreactors treating RAS effluents

Aalto, S., von Ahnen, M., Suurnäkki, S., Pedersen, P. B. & Tiirola, M., 2019, 5th NordicRAS Workshop on Recirculating Aquaculture Systems Berlin, Germany, 7-8 October 2019: Book of Abstracts.. Dalsgaard, J. (ed.). Hirtshals, Denmark: DTU Aqua, p. 49 1 p. (DTU Aqua-rapport; No. 350-2019).

Research output: Chapter in Book/Report/Conference proceeding › Conference abstract in proceedings › Research › peer-review

Open Access

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Optimering af indretning og drift af plantelaguner på dambrug

Pedersen, P. B., Dalsgaard, A. J. T., von Ahnen, M., Michelsen, K. & Thomsen, B., 2019, Dansk Akvakultur. 23 p. (Faglig rapport fra Dansk Akvakultur; No. 2019-2).

Research output: Book/Report › Report › Research

Open Access

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245 Downloads (Pure)

Salinity affects nitrate removal and microbial composition of denitrifying woodchip bioreactors treating recirculating aquaculture system effluents

von Ahnen, M., Aalto, S. L., Suurnäkki, S., Tiirola, M. & Pedersen, P. B., 2019, In: Aquaculture. 504, p. 182-189

Research output: Contribution to journal › Journal article › Research › peer-review

2018

Nitrate removal from aquaculture effluents using woodchip bioreactors improved by adding sulfur granules and crushed seashells

von Ahnen, M., Pedersen, P. B. & Dalsgaard, J., 2018, In: Water Science and Technology. 77, 9, p. 2301-2310

Research output: Contribution to journal › Journal article › Research › peer-review

Nutrient removal in a constructed wetland treating aquaculture effluent at short hydraulic retention time

Dalsgaard, J., von Ahnen, M., Naas, C. & Pedersen, P. B., 2018, In: Aquaculture Environment Interactions. 10, p. 329-343

Research output: Contribution to journal › Journal article › Research › peer-review

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Performance of full-scale woodchip bioreactors treating effluents from commercial RAS

von Ahnen, M., Pedersen, P. B. & Dalsgaard, J., 2018, In: Aquacultural Engineering. 83, p. 130-137

Research output: Contribution to journal › Journal article › Research › peer-review

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The composition of microbial community and denitrifying bacteria in full-scale woodchip fields

Suurnäkki, S., Aalto, S., von Ahnen, M., Tiirola, M. & Pedersen, P. B., 2018.

Research output: Contribution to conference › Conference abstract for conference › Research

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138 Downloads (Pure)

2017

First experiences from full-scale denitrifying woodchip bioreactors operated end-of-pipe at commercial RAS

von Ahnen, M., Pedersen, P. B. & Dalsgaard, A. J. T., 2017, 4th NordicRAS Workshop on Recirculating Aquaculture Systems. Aalborg, Denmark, 12-13 October 2017: Book of Abstracts. Dalsgaard, A. J. T. (ed.). National Institute of Aquatic Resources, Technical University of Denmark, p. 34 56 p. (DTU Aqua Report; No. 321-17).

Research output: Chapter in Book/Report/Conference proceeding › Conference abstract in proceedings › Research

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637 Downloads (Pure)

Particle surface area and bacterial activity in recirculating aquaculture systems

Pedersen, P. B., von Ahnen, M., Fernandes, P., Naas, C., Pedersen, L.-F. & Dalsgaard, A. J. T., 2017, In: Aquacultural Engineering. 78 A, p. 18-23

Research output: Contribution to journal › Journal article › Research › peer-review

Open Access

2016

New approaches to improve the removal of dissolved organic matter and nitrogen in aquaculture

von Ahnen, M., 2016, DTU Aqua. 135 p.

Research output: Book/Report › Ph.D. thesis

Optimizing nitrate removal in woodchip beds treating aquaculture effluents

von Ahnen, M., Pedersen, P. B., Hoffmann, C. C. & Dalsgaard, A. J. T., 2016, In: Aquaculture. 458, p. 47-54

Research output: Contribution to journal › Journal article › Research › peer-review

Start-up performance of a woodchip bioreactor operated end-of-pipe at a commercial fish farm—A case study

von Ahnen, M., Pedersen, P. B. & Dalsgaard, A. J. T., 2016, In: Aquacultural Engineering. 74, p. 96-104

Research output: Contribution to journal › Journal article › Research › peer-review

2015

Degradation of urea, ammonia and nitrite in moving bed biofilters operated at different feed loadings

von Ahnen, M., Pedersen, L.-F., Pedersen, P. B. & Dalsgaard, A. J. T., 2015, In: Aquacultural Engineering. 69, p. 50-59

Research output: Contribution to journal › Journal article › Research › peer-review

End-of-pipe removal of nitrogen using woodchip beds

von Ahnen, M., Pedersen, P. B. & Dalsgaard, A. J. T., 2015, 3rd NordicRAS Workshop on Recirculating Aquaculture Systems Molde, Norway, 30 September - 1 October 2015: Book of Abstracts. Dalsgaard, A.-J. T. (ed.). National Institute of Aquatic Resources, Technical University of Denmark, p. 50 (DTU Aqua Report; No. 301-2015).

Research output: Chapter in Book/Report/Conference proceeding › Conference abstract in proceedings › Research

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Room for all? - particulate surface area and bacterial activity in RAS

Pedersen, P. B., von Ahnen, M., Fernandes, P., Naas, C., Pedersen, L.-F. & Dalsgaard, A. J. T., 2015, 3rd NordicRAS Workshop on Recirculating Aquaculture Systems Molde, Norway, 30 September - 1 October 2015: Book of Abstracts. Anne Johanne Tang, D. (ed.). Technical University of Denmark. National Institute of Aquatic Resources, p. 28 (DTU Aqua Report; No. 301-2015).

Research output: Chapter in Book/Report/Conference proceeding › Conference abstract in proceedings › Research

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421 Downloads (Pure)

2014

Removal of urea, ammonium and nitrite in moving bed biofilters operated at different loadings

von Ahnen, M., Pedersen, L.-F., Pedersen, P. B. & Dalsgaard, A. J. T., 2014.

Research output: Contribution to conference › Conference abstract for conference › Research

Mathis von Ahnen

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