Experimental study of seepage flow properties with biofilm development in porous media with different filter morphologies

Permeable Biofilms Can Support Persistent Hyporheic Anoxic Microzones

“…This model is created on basis of previous microscopic models which described pore-scale flow patterns and/or conservative solutes transport in biofilms and open pore spaces system (e.g., Deng et al, 2013;Karimifard et al, 2021), and the previous microscale models that coupled the three interconnected processes but typically neglected or simplified the flow within biofilms (e.g., Chowdhury et al, 2020;Knutson et al, 2005;Tang et al, 2013;Thullner & Baveye, 2008). The modeling framework uses a realistic 2-D pore network structures (Figure 1b) that are obtained from the experimental work of Weng (2020) and Zhou et al (2020). The 2-D model domain has a size of 8 cm [length] × 6 cm [width], and such size is similar with the characterizations of the HZ water-sediment interfaces reported in recent modeling and field investigations (e.g., Briggs et al, 2018;Chowdhury et al, 2020).…”

“…The output data of the numerical model simulations is deposited in Hydroshare and is available at https:// doi.org/10.4211/hs.e447a40108ed46dfa7407f5fb999ae6d. Experimental data from Weng (2020) and Zhou et al (2020) are used in the numerical model simulations.…”

“…The modeling framework uses a realistic 2‐D pore network structures (Figure 1b) that are obtained from the experimental work of Weng (2020) and Zhou et al. (2020). The 2‐D model domain has a size of 8 cm [length] × 6 cm [width], and such size is similar with the characterizations of the HZ water‐sediment interfaces reported in recent modeling and field investigations (e.g., Briggs et al., 2018; Chowdhury et al., 2020).…”

“…(b) Geometry of pore spaces (from Zhou et al. (2020)) and boundary configurations for flow (black) and reactive transport (red) of the 2‐D numerical model that is established for simulating hypothetical HZ interfaces. (c) Two distinct patterns of the microzones formations and evolutions during various biofilm growth stages: (1) physical and biogeochemical conditions‐dependent perennial microzones for permeable biofilms (left column) and (2) physical and biogeochemical conditions‐independent microzones for impervious biofilms (right column).…”

Investigation of clogging in porous media induced by microorganisms using a microfluidic application

“…Numerous studies have investigated bioclogging in porous media at different scales such as those in column reactors, core plug and sandpack, as well as in micromodels. Microfluidics applications offer several benefits for investigating bioclogging in porous media, particularly for visualization of microbes and biomass at the pore-scale level 6,[11][12][13][14] . Dupin and McCarty (2000) and Kim and Fogler (2000) 15 reported the utilization of silicon and glass etched micromodels to investigate clogging phenomena in porous media.…”