Vadose zone oxygen (O2) dynamics during drying and wetting cycles: An artificial recharge laboratory experiment

Dutta, Tanushree; Brangarí, Albert C.; Fernàndez-García, Daniel; Rubol, S.; Tirado-Conde, Joel; Sánchez-Vila, Xavier

doi:10.1016/j.jhydrol.2015.04.048

Cited by 47 publications

(41 citation statements)

References 32 publications

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“…Substrate oxidation reduction potential (ORP) and/or oxygen concentration decreased with depth because the oxygen from air diffused to the substrate was limited in non-aerated rapid infiltration system and SWIS (Dutta et al, 2015;Wang et al, 2010;Zhang et al, 2005). However, substrate ORP results still showed that aerobic conditions in the upper layer and anoxic or anaerobic conditions in the subsequent sections were well developed in a SWIS with continuous feed and intermittent aeration.…”

Section: Effect Of Intermittent Aerationmentioning

confidence: 99%

Effect of hydraulic loading rate on pollutant removal efficiency in subsurface infiltration system under intermittent operation and micro-power aeration

Yang

Zhan

et al. 2016

Bioresource Technology

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Section: Effect Of Intermittent Aerationmentioning

confidence: 99%

Effect of hydraulic loading rate on pollutant removal efficiency in subsurface infiltration system under intermittent operation and micro-power aeration

Yang

Zhan

et al. 2016

Bioresource Technology

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“…Laboratory experiments and constructed wetlands demonstrate that concentration of microbial activity and TOC degradation is concentrated in the first centimeters of the filter material (Ragusa et al, 2004;Sleytr et al, 2007;Tietz et al, 2007) in response to oxygen concentration vertical distribution. Although rapid oxygen depletion and consequent denitrification conditions have been evidenced in lab-scale MAR experiments (Alidina et al, 2014a;Dutta et al, 2015), this effect may not happen 10 rapidly under real infiltration conditions, where entrapped gas (Heilweil et al, 2004) or fingering processes (Kung, 1990) may provide higher oxygen concentrations than in lower dimension systems (e.g., columns). Lab-experiments are doubtlessly useful to elucidate the behavior of microbial communities under controlled conditions.…”

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confidence: 99%

Microbial community changes induced by Managed Aquifer Recharge activities: Linking hydrogeological and biological processes

Barba¹,

Folch²,

Gaju³

et al. 2018

Preprint

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Abstract. Managed Aquifer Recharge (MAR) is a worldwide used technique to increase the availability of water resources.We study how MAR modifies microbial ecosystems, and its implications for enhancing biodegradation processes to eventually improve groundwater quality. We compare soil and groundwater samples taken from a MAR facility located in NE Spain during recharge (with the facility operating continuously for several months) and after four months of no recharge. The study demonstrates a strong correlation between soil and water microbial prints with respect to sampling location along the mapped 5 infiltration path. In particular, managed recharge practices disrupt groundwater ecosystems by modifying diversity indices and the composition of microbial communities, indicating that infiltration favors the growth of certain populations. Analysis of the genetic profiles showed the presence of nine different bacterial phyla in the facility, revealing high biological diversity at the highest taxonomic range. In fact, the microbial population patterns under recharge conditions agree with the Intermediate Disturbance Hypothesis. Moreover, DNA sequence analysis of excised DGGE band patterns revealed the existence of indicator 10 species linked to MAR, most notably Dehalogenimonas sp, Nitrospira sp and Vogesella sp. Our real facility multidisciplinary study (hydrological, geochemical and microbial), involving soil and groundwater samples, support that MAR is a naturallybased, passive, and efficient technique with broad implications for the biodegradation of pollutants dissolved in water.

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“…Whereas investigations on pollution of the aquifer in up-flow direction in water-saturated soil in the meter-scale in a lysimeter have been reported over a period of 84 days [45], [16] to our knowledge no long-term horizontal flow experiments of groundwater in this scale under defined conditions are available. Thus we performed three-dimensional long-term horizontal flow-through experiments in an instrumented stainless steel container (SSC) of lysimeter size through well-defined quartz sand and its CF.…”

Section: Introductionmentioning

confidence: 98%

“…Drying cycles allowed re-saturation of the soil with oxygen even in the depth, and after re-wetting the growth of microorganism in the biofilm on soil particles was continuing, indicating survival of the bacteria in the biofilm. This led to further decreasing infiltration rates [16] and may finally cause biological clogging. First attention of bacterial biofilm formation came from medicine, when microorganisms growing in or forming mucous surfaces were recognized as a common cause of persistent infections [13].…”

Section: Introductionmentioning

confidence: 99%

“…Theoretically the thickness of a biofilm depends on the continuity of nutrient supply, the strength of attachment e.g. by electrostatic forces or formation of EPS [43], the nutrient concentration and the electron acceptor availability for aerobic respiration [16]. The highest cell masses are obtained if sufficient oxygen is available for respiration of carbon sources, since the energy gain of maximally 38 mol ATP per mol glucose is much higher than that for other respiration or fermentation pathways [21].…”

Section: Introductionmentioning

confidence: 99%

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Influence of Increasing Concentrations of Organic Pollutants on Biofilm Formation and Flow Parameters in a Sand-aquifer and Its Capillary Fringe.

Jost¹,

Winter²,

Gallert³

2017

EPP

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Abstract. We followed the development of a Pseudomonas fluorescens biofilm on quartz sand in an instrumented horizontal flow-through stainless steel container (SSC) in lysimeter-scale, to investigate its impact on physical soil parameters within the aquifer and the capillary fringe (CF). Increasingly concentrated biodegradable substances in a liquid medium were pumped through the sand in the SSC creating an artificial aquifer. Biofilm development and its influence on flow parameters and oxygen concentration profiles, as well as temperature or water suction changes with time were determined. After more than 19 weeks of medium flow, at DOC concentrations of finally about 300 mg/L, P. fluorescens formed a strong biofilm and the highest biomass concentrations with up to 2.8 mg volatile solids per g dry sand were found in the transition zone of the CF. The soil temperature, which was slightly increased, or the water suction was significantly influenced during the experiment. The effects were strongest within the first 0.3 m of flow stretch, where the highest biomass values were detected. During the total experimental duration of 54 weeks the average flow velocity was reduced by up to 15 % due to clogging effects and the oxygen profiles were changed drastically. Results may be representative for real polluted aquifers. Keywords:Pseudomonas fluorescens, sand aquifer, capillary fringe, soil contamination, biofilm formation, biological clogging. IntroductionSoil and groundwater are naturally inhabited by a vast variety of prokaryotes. It was estimated that 2.5 x 10 29 microorganisms live in the top 8 m of the terrestrial subsurface and at least 2.5 x 10 30 microorganisms below 8 m depth, either suspended in the water phase or attached onto organic and mineral compounds of top soil and the underground [53]. Anaerobic bacteria in deep soil layers may ferment organic pollutants to mainly fatty acids whereas aerobic bacteria in upper soil layers may respire organic pollutants in the presence of oxygen to carbon dioxide and thus contribute to "clean-up". There seems to be a spatial heterogeneity of microorganisms. Whereas mainly aerobic bacteria, fungi and protozoa colonize soil surface layers, the proportion of mainly anaerobic bacteria (most of them are "fermenters") and of Actinomycetes increases with depth in the underground in the vicinity and below the groundwater table. These population changes are accompanied by a significantly decreasing diversity of microorganisms [17] and by a decrease of physiological functions [45]. Groundwater bacteria tend to form a biofilm on mineral surfaces of soil particles and may cause preferential flow paths or clogging in heterogeneous soil compartments [45]. In contrast aerobic motile bacteria can even move into the top zone of the capillary fringe (CF, spanning from the groundwater table to still visible moisture above it in a quartz sand aquifer) above the water-saturated zone of quartz sand and form a dense biofilm in the still highly saturated interface region of the CF [31]. Biofi...

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Vadose zone oxygen (O2) dynamics during drying and wetting cycles: An artificial recharge laboratory experiment

Cited by 47 publications

References 32 publications

Effect of hydraulic loading rate on pollutant removal efficiency in subsurface infiltration system under intermittent operation and micro-power aeration

Effect of hydraulic loading rate on pollutant removal efficiency in subsurface infiltration system under intermittent operation and micro-power aeration

Microbial community changes induced by Managed Aquifer Recharge activities: Linking hydrogeological and biological processes

Influence of Increasing Concentrations of Organic Pollutants on Biofilm Formation and Flow Parameters in a Sand-aquifer and Its Capillary Fringe.

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