Dr.Sc.ing., senior researcher Kristine Rugele

  • E-pasts: kristine.rugele@rtu.lv

Main research interests:

  • Anaerobic digestion
  • Biogas
  • Renewable energy
  • Innovative materials in green energy production
  • Biogas upgrading

Ph.D. thesis: Anaerobic digestion of dairy residues and process enhancement using composite materials from industrial wastes

Major publications:

  1. Kalnina, I., Rugele, K., Rubulis, J. Digestate Management Practices in Latvia from Nitrogen Perspective. Energy Procedia, 2018, Vol.147, 368.-373.lpp. ISSN 1876-6102. Pieejams: doi:10.1016/j.egypro.2018.07.105
  2. Kalneniece, K., Bērziņš, A., Petriņa, Z., Ruģele, K., Salava, E., Švirksts, K., Grūbe, M., Nikolajeva, V., Mutere, O. Application of Anaerobic Digestate as Inoculum for Treatment of the Plant-Derived Wastes: Case Study. Materials Science and Applied Chemistry, 2017, 34, 50.-58.lpp. ISSN 1407-7353. e-ISSN 2255-8713. Pieejams: doi:10.1515/msac-2017-0008
  3. K. Rugele, G. Bumanis, L. Mezule, T. Juhna and D. Bajare. Application of industrial wastes in renewable energy production. 2015.Agronomy Research Vol.13(2) Publication

Full papers in Scientific Journals:

  1. Ruģele, K., Būmanis, Ģ., Bajāre, D., Mežule, L., Pitk, P. Effect of glass additive in alkaline granules in anaerobic treatment of whey. Proceedings: 5th International Symposium on Energy form Biomass and Waste, 2014, pp. 1-9 (Scopus).
  2. Ruģele, K., Mežule, L., Daļecka, B., Larsona, S., Vanags, J., Rubulis, J. Application of Fluorescent in situ Hybridisation for Monitoring Methanogenic Archaea in Acid Whey Anaerobic Digestion. Agronomy Research, 2013, Vol.11, No.2, pp.373-380 (Scopus).
  3. Ruģele, K., Būmanis, Ģ., Bajāre, D., Lakevičs, V., Rubulis, J. Alkaline Activated Material for pH Control in Biotechnologies. Key Engineering Materials, 2014, Vol.604, pp.223-226 (Scopus).
  4. Ruģele, K., Būmanis, Ģ., Eriņa, L., Erdmane, D. Composite Material for Effective Cheese Whey Anaerobic Digestion. Key Engineering Materials, 2014, Vol.604, pp. 236-239 (Scopus).
  5. Ruģele, K., Gavare, M., Grūbe, M., Tihomirova, K., Skripsts, Ē., Larsona, S., Rubulis, J. Characterization of Lactose Consumption during the Biogas Production from Acid Whey by FT-IR Spectroscopy. World Academy of Science, Engineering and Technology, 2013, Vol. 77, pp.253-258.
  6. Ruģele, K., Skripsts, Ē., Juhna, T., Larsona, S. Bioaugmentation to Improve Biogas Yield in Cheese Whey Anaerobic Digestion. In: 13th World Congress on Anaerobic Digestion : Proceedings, Spain, 2013, pp.1-4.
  7. Rugele, K., Skripsts, E., Mezule, L., Pitk, P., Bajare D., Juhna, T. Use of alkali-activated aluminosilicate material to enhance biogas production from acidic whey. Open Biotechnology Journal, 2014, pp. 1-9 (Accepted).
  8. Būmanis, Ģ., Ruģele, K., Kurpnieks, O., Bajāre, D. Effect of alkaline material granule size on ability of adjustment the buffer capacity. Medžiagotyra, 2015, pp. 1-5 (Accepted).
  9. Ruģele, K., Būmanis, Ģ., Mežule, L, Juhna, T., Bajāre, D. Application of industrial wastes in renewable energy production. Agronomy research, 2015 (Accepted).


  1. A method of anaerobic digestion of acidic whey in four-chamber system. E.Skripsts, K. Rugele, J. Rubulis, V. Dubrovskis. EU patent No. EP13198723.2, 2014 (Accepted).
  2. Method of using alkali-activated non-cement binders for producing biogas from cheese whey. K. Rugele, E.Skripsts, D.Bajare, T. Juhna, S. Larsson. EU patent No. EP12199477.6, 2013 (Accepted).