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Thesis defence presentation: Subsurface as a bioreactor: Interaction between physical heterogeneity and microbial processes
thesis Núria Perujo

In charge of: Núria Perujo
Advisors: Dr. Anna M. Romaní (Universitat de Girona) and Dr. Xavier Sánchez (Universitat Politècnica de Catalunya)
Day and time: Friday, 12 of July, 2018 at 11:00 h
Site: Classroom 212, Building D2, Campus Nord, UPC

Infiltration systems are water treatment technologies based on water percolation through a porous media while series of biogeochemical processes occur. Biofilms in the porous media play a key role on these biogeochemical processes. However, an excessive growth of biofilms can have deleterious effects in infiltration systems (bioclogging), reducing their infiltration capacity. Sediment grain size distribution is a key parameter on the performance of these water treatment technologies as it determines hydraulic parameters, biofilm growth, and the occurrence of bioclogging, as well as biogeochemical process rates. The main objective of this thesis is to study the influence of the sediment grain size distribution on biogeochemical processes and on bioclogging in infiltration systems used as tertiary water treatment systems for water nutrient removal. To achieve this objective, two infiltration experiments have been performed: (a) a laboratory-scale column experiment and (b) an outdoor infiltration experiment.