Mary Barrios Hernandez

PhD candidate


Mary Luz Barrios-Hernandez graduated on 30 September 2021. Find the link to her thesis here.


Mary Luz Barrios-Hernandez was born in San Jose, Costa Rica. She is an Environmental Engineer (2011) from the Instituto Tecnologico de Costa Rica and has an MSc in Urban Water Sanitation from UNESCO-IHE (2016). Currently, she is at the end of her PhD research at the Water Supply, Sanitation and Environmental Engineering Department at IHE Delft, in partnership with the Biotechnology Department at TU Delft. Her promotors are Damir Brdanovic and Mark van Loosdrecht and her co-promotor is Tineke Hooijmans. 


Assessment of the effects of warm temperatures, faecal sludge co-treatment and pathogen removal on Aerobic Granular Sludge systems.

Research Summary


  • Pathogen removal in aerobic granular sludge systems.

Research Interests

  • Biological Wastewater Treatment and Sanitation
  • Aerobic Granular Sludge
  • Pathogen removal 
  • Molecular Biology

Funding Source

Instituto Tecnologico de Costa Rica  (


Barrios-Hernandez, M.L., Bettinelli, C., Mora-Cabrera, K., Vanegas-Camero, M.-C., Garcia, H., van de Vossenberg, J., Prats, D., Brdjanovic, D., van Loosdrecht, M.C.M. and Hooijmans, C.M.  2021.  Unravelling the removal mechanisms of bacterial and viral surrogates in aerobic granular sludge systems. Water Research, 116992.

Barrios-Hernandez, M.L., Buenano-Vargas, C., Garcia, H., Brdjanovic, D., van Loosdrecht, M.C.M. and Hooijmans, C.M.  2020a.  Effect of the co-treatment of synthetic faecal sludge and wastewater in an aerobic granular sludge system. Science of The Total Environment, 140480.

Barrios-Hernandez, M.L., Pronk, M., Garcia, H., Boersma, A., Brdjanovic, D., van Loosdrecht, M.C.M. and Hooijmans, C.M.  2020b.  Removal of bacterial and viral indicator organisms in full-scale aerobic granular sludge and conventional activated sludge systems. Water Research X 6, 100040.



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