Photo of Sepehr Shakeri Yekta

Sepehr Shakeri Yekta

Associate Professor, Head of Division, Docent

I am interested in the interactions between chemical and biological mechanisms involved in complex organic matter degradation during anaerobic digestion, which is important for improving efficiency and stability of biogas production processes.

Trace metals in biogas production processes

Performance of anaerobic digestion processes depend on a balanced supply of trace metals, which are required for the activity of the enzymes driving the metabolic machinery of the anaerobic microorganisms. We study the processes which control the chemical speciation and bio-uptake of trace metals in biogas reactors.

Molecular level characteristics of organic matter in biogas reactors

The nature of organic compounds in anaerobic digestion processes determines the degree of the organic matter conversion to biogas. We study molecular-level characteristics of underutilized organic matter in biogas reactors to further improve their degradability and thus, the biogas production efficiency



Thuane Mendes Anacleto, Betina Kozlowsky-Suzuki, Annika Björn (Fredriksson), Sepehr Shakeri Yekta, Laura Shizue Moriga Masuda, Vinicius Peruzzi de Oliveira, Alex Enrich Prast (2024) Methane yield response to pretreatment is dependent on substrate chemical composition: a meta-analysis on anaerobic digestion systems Scientific Reports, Vol. 14, Article 1240 Continue to DOI
Helena Rodrigues Oliveira, Betina Kozlowsky-Suzuki, Annika Björn (Fredriksson), Sepehr Shakeri Yekta, Cristiane Fonseca Caetano, Erika Flavia Machado Pinheiro, Humberto Marotta, Joao Paulo Bassin, Luciano Oliveira, Marcelo de Miranda Reis, Mario Sergio Schultz, Norberto Mangiavacchi, Viridiana Santana Ferreira-Leitao, Daniel Oluwagbotemi Fasheun, Fernanda Geraldo Silva, Igor Taveira, Ingrid Roberta de Franca Soares Alves, Julia Castro, Juliana Velloso Durao, Juliana Guimaraes, Mariana Erthal Rocha, Marina Tomasini, Pedro Vitor de Oliveira Martins, Rogerio Presciliano, Stella Buback dos Santos, Tamires Marques Faria, Tarcisio Correa, Thiago de Nuno Mendes Pery de Linde, Fernanda Abreu, Alex Enrich Prast (2024) Biogas potential of biowaste: A case study in the state of Rio de Janeiro, Brazil Renewable energy, Vol. 221, Article 119751 Continue to DOI


Sepehr Shakeri Yekta, Bo H Svensson, Ulf Skyllberg, Anna Schnürer (2023) Sulfide in engineered methanogenic systems - Friend or foe? Biotechnology Advances, Vol. 69, Article 108249 Continue to DOI
David Fernandez-Dominguez, Sepehr Shakeri Yekta, Mattias Hedenstroem, Dominique Patureau, Julie Jimenez (2023) Deciphering the contribution of microbial biomass to the properties of dissolved and particulate organic matter in anaerobic digestates Science of the Total Environment, Vol. 877, Article 162882 Continue to DOI
Luka Safaric, Annika Björn (Fredriksson), Bo H Svensson, David Bastviken, Sepehr Shakeri Yekta (2023) Rheology, Micronutrients, and Process Disturbance in Continuous Stirred-Tank Biogas Reactors Industrial & Engineering Chemistry Research, Vol. 62, p. 17372-17384 Continue to DOI


Research & Teaching


Teaching in environmental science program and following courses:

  • Biogas process
  • Designing environmental studies
  • Environmental monitoring
  • Global biogeochemical cycles
  • Environmental Chemistry.


Improved hydrolysis as a means to increase the overall degradability of organic material in anaerobic digestion for biogas production.
Project Leaders: Annika Björn 


  • Biogas Research Center (BRC) Linköping University
  • Swedish Energy Agency
  • BRC partners and members including Scandinavian Biogas Fuels AB, Tekniska Verken i Linköping AB, Nordvästra Skånes Renhållnings AB, Swedish Biogas International AB, Västblekinge Miljö AB