Assessment of artificial substrates for evaluating groundwater microbial quality

Natural attenuation of chlorinated ethenes in hyporheic zones: A review of key biogeochemical processes and in-situ transformation potential

“…This framework supports field observations where enhanced dechlorination activity and OHRB are reported in sediment domains where diffusive transport is locally dominant (Conant et al, 2004;Abe et al, 2009;Damgaard et al, 2013;Atashgahi et al, 2015;2017a). Biofilm colonisation is also influenced by changes in pore water temperature, pH and light exposure as well as sediment surface roughness (Gette-Bouvarot et al, 2015;Voisin et al, 2016).…”

“…These methods are well suited to homogenous silt and clay sediments but are subject to the same limitations for coring in granular deposits discussed above. Microbial 'trapping' using an emplaced porous medium for biofilm colonisation is an established approach in aquifer media (Voisin et al, 2016).…”

Influence of total chloride, arsenic and aluminum contents on microorganisms of open wells

“…The mathematical models 3D between the microbiological parameters and concentration of total chlorides, Al or As in the samples of groundwater: a) the Intestinal enteroccoci (z) = f (E. coli bacteria (x), Coliform bacteria (y)); b) Coliform bacteria (z)= f(Cl -(x), E. coli bacteria (y)); c) E. coli bacteria (z)=f (Intestinal enterococci (x), (Al (y)); (d) E. coli bacteria (z)= f(As(x), Coliform bacteria(y))Similar correlation coefficients are obtained as a result of arsenic use, obtaining a 3D model with the correlation coefficient R 2 = 0.985 and F = 302, due to the dependence between E. coli bacteria, arsenic concentrations and coliform bacteria level according to equation(4).…”

“…Microorganisms are relevant markers for the proper health and functioning of the groundwater ecosystem. Thus, by performing microbial analyses such as biomass, activity and diversity of microorganisms, possible organic matter enrichments in groundwater ecosystems could be detected [4].…”

Towards an integrated understanding of how micro scale processes shape groundwater ecosystem functions

“…In groundwater sediments, bacteria and archaea are known to occur patchily in micro colonies of around 50 cells (Harvey et al, 1984;Iltis et al, 2011;Voisin et al, 2016), not continuous biofilms (except for zones in intense exchange with the surface, e.g. on groundwater pumps; Benedek et al, 2016), and this has bottom-up implications for the organisms feeding on the bacteria, fungi, and archaea, i.e.…”