Home
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

Publications

2024

Thuane Mendes Anacleto, Betina Kozlowsky-Suzuki, Annika Björn, 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, 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

2023

Sepehr Shakeri Yekta, Bo 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

News

Innehållet i gröna påsen blir till biogas i reaktorn

They found the bacteria that like fat

Fat in a biogas reactor behaves as it does at home in the kitchen: it’s sticky and clogs things up. The researchers at the Biogas Research Center, however, have discovered a helping hand, a bacterium that can break down the troublesome fat molecules.
Hållbarhet

SEK 20 million for sustainable development

Eight LiU researchers will each receive approx. SEK 3 million for research relating to sustainable development. One of the research projects will answer the question: Which is better and cheaper: renovation or demolition and new construction.

Research & Teaching

Teaching

Teaching in environmental science program and following courses:

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

Research 

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

Collaborators

  • 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

Related researchers

Photo of Annika Björn

Annika Björn

Associate Professor, Docent

Photo of Alex Enrich Prast

Alex Enrich Prast

Professor

Photo of Luka Safaric

Luka Safaric

Research Engineer

Related Content

bilden visar stenar i vatten. Pictures shows stones in vater

Environmental Change (TEMAM)

Almost all nature bears traces of human activity. Its condition is strongly linked to social development. This creates a need for scientific breadth and problem-solving skills. Education and research at Environmental Change respond to this challenge.
Biogas fueled car at the fueling station.

Biogas Solutions Research Center

BSRC is a national competence center for biogas research administered by the LiU. It's base for the development of innovative and resource-efficient biogas solutions often with positive local and regional effects on the environment and the economy.

Tags