Redox potential dynamics in a horizontal subsurface flow constructed wetland for wastewater treatment: Diel, seasonal and spatial fluctuations

Dusek, J.T.; Picek, Tomáš; Čı́žková, Hana

doi:10.1016/j.ecoleng.2008.08.008

Cited by 89 publications

(49 citation statements)

References 18 publications

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“…In addition, zinc is reported to be retained on iron plaques at the surface of plant roots (Otte et al 1995). However, in filtration beds of HF CWs anoxic/ anaerobic conditions prevail (e.g., Dušek et al 2008) and therefore precipitation of Fe/Mn compounds is not the major retention mechanism as Mn and Fe precipitates dissolute under these conditions (Laanbroek 1990;Jacobson 1994;Lovley 1995;Green et al 2003;Cooper et al 2006).…”

Section: Introductionmentioning

confidence: 98%

Heavy metals in sediments from constructed wetlands treating municipal wastewater

et al. 2010

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Constructed wetlands are commonly used for treatment of municipal sewage. The treatment is usually aimed at removal of organics, suspended solids, nutrients and microbial pollution. The information on removal and fate of heavy metals is very limited. The purpose of this study was to evaluate the amount of sediments and heavy metal concentration in the sediments in filtration beds of seven constructed wetlands with horizontal subsurface flow treating municipal sewage with various length of operation. The results revealed that concentrations of Cd, Ni, Pb, Cu, Cr and Zn in the sediment are mostly comparable with concentrations occurred in natural unpolluted or slightly polluted wetlands. The concentrations are much lower than those found in wetlands impacted with mine drainage waters or wastewater from industrial operations. Concentrations of studied heavy metals exceeded only occasionally limits set by the Czech legislation. However, when heavy metal concentrations are evaluated within the filtration material the concentrations are well below the limits set for soils in the Czech Republic. The results also revealed that concentrations of heavy metals in the sediment do not reflect the time of operation probably due to buildup of sediments from suspended solids contained in wastewaters. However, the sediment mass increases during the course of operation and consequently the metal mass increases as well.

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Section: Introductionmentioning

confidence: 98%

Heavy metals in sediments from constructed wetlands treating municipal wastewater

et al. 2010

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“…These oscillations were indeed described for root exudation by Juncus effusus, a common wetland plant (16,17). Fluctuating redox conditions in the rhizosphere of CWs, cooccurring with the day-night regimen (18), as well as the influence of these diurnal fluctuations on various redox transformation processes involving nitrogen compounds (19) and iron (20) have been reported. Yet, while several studies described diurnal patterns of abiotic parameters in CW systems, studies on diurnal patterns of microbial activity in CW systems are scarce (21).…”

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confidence: 94%

Aerobic Toluene Degraders in the Rhizosphere of a Constructed Wetland Model Show Diurnal Polyhydroxyalkanoate Metabolism

Lünsmann

Kappelmeyer

Taubert

et al. 2016

Appl Environ Microbiol

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Constructed wetlands (CWs) are successfully applied for the treatment of waters contaminated with aromatic compounds. In these systems, plants provide oxygen and root exudates to the rhizosphere and thereby stimulate microbial degradation processes. Root exudation of oxygen and organic compounds depends on photosynthetic activity and thus may show day-night fluctuations. While diurnal changes in CW effluent composition have been observed, information on respective fluctuations of bacterial activity are scarce. We investigated microbial processes in a CW model system treating toluene-contaminated water which showed diurnal oscillations of oxygen concentrations using metaproteomics. Quantitative real-time PCR was applied to assess diurnal expression patterns of genes involved in aerobic and anaerobic toluene degradation. We observed stable aerobic toluene turnover by Burkholderiales during the day and night. Polyhydroxyalkanoate synthesis was upregulated in these bacteria during the day, suggesting that they additionally feed on organic root exudates while reutilizing the stored carbon compounds during the night via the glyoxylate cycle. Although mRNA copies encoding the anaerobic enzyme benzylsuccinate synthase (bssA) were relatively abundant and increased slightly at night, the corresponding protein could not be detected in the CW model system. Our study provides insights into diurnal patterns of microbial processes occurring in the rhizosphere of an aquatic ecosystem. IMPORTANCEConstructed wetlands are a well-established and cost-efficient option for the bioremediation of contaminated waters. While it is commonly accepted knowledge that the function of CWs is determined by the interplay of plants and microorganisms, the detailed molecular processes are considered a black box. Here, we used a well-characterized CW model system treating toluenecontaminated water to investigate the microbial processes influenced by diurnal plant root exudation. Our results indicated stable aerobic toluene degradation by members of the Burkholderiales during the day and night. Polyhydroxyalkanoate synthesis in these bacteria was higher during the day, suggesting that they additionally fed on organic root exudates and reutilized the stored carbon compounds during the night. Our study illuminates microbial processes occurring in the rhizosphere of an aquatic ecosystem. C onstructed wetlands (CWs) are well-established treatment systems for the bioremediation of contaminated waters (1), including industrial effluents originating from petroleum refineries and their associated contaminated sites (2, 3). Aromatic hydrocarbons present in those wastewaters can effectively be removed in CWs (4-7), largely driven by the interplay of plant physiology and microbial degradation processes in the rhizosphere (8, 9). As in any planted habitat, the rhizosphere of CWs is a complex environment with increased abundance and activity of microorganisms compared to those in the surrounding zones (10). It is shaped by the roots and plant-derived exu...

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“…The redox potential (E H ) and pH of the substrate were measured at a 10-cm depth at all sites, repeated three times during a 24-h interval on 12 August 2011, when the water level was at 724.19 meters above sea level (masl). E H was measured with on all sites simultaneously with platinum electrodes (made by EDT, Turnov, Czech Republic) that were individually connected to the high terminals and the reference electrode (Ag/AgCl) (Dušek et al, 2008). The E H values were corrected relative to the normal hydrogen electrode by adding 200 mV (Bochove et al, 2002) and subsequently recalculated to pH = 7 using the Nernst equation (Gambrell and Patrick, 1978).…”

Section: P4mentioning

confidence: 99%

Response of littoral macrophytes to water level fluctuations in a storage reservoir

Krolová

Čı́žková

Hejzlar

et al. 2013

Knowl. Managt. Aquatic Ecosyst.

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Lakes and reservoirs that are used for water supply and/or flow regulations have usually poorly developed littoral macrophyte communities, which impairs ecological potential in terms of the EU Water Framework Directive. The aim of our study was to reveal controlling factors for the growth of littoral macrophytes in a storage reservoir with fluctuating water level (Lipno Reservoir, Czech Republic). Macrophytes occurred in this reservoir only in the eulittoral zone i.e., the shoreline region between the highest and the lowest seasonal water levels. Three eulittoral sub-zones could be distinguished: the upper eulittoral with a stable community of perennial species with high cover, the middle eulittoral with relatively high richness of emergent and amphibious species present at low cover values, and the lower eulittoral devoid of permanent vegetation. Cover and species composition in particular sub-zones were primarily influenced by the duration and timing of flooding, followed by nutrient limitation and strongly reducing conditions in the flooded organic sediment. Our results stress the ecological importance of eulittoral zone in reservoirs with fluctuating water levels where macrophyte growth can be supported by targeted management of water level, thus helping reservoir managers in improving the ecological potential of this type of water bodies. RÉSUMÉ Réponse des macrophytes littoraux aux fluctuations du niveau d'eau dans un réservoir Mots-clés :Les lacs et réservoirs qui sont utilisés pour l'approvisionnement en eau et/ou les régulations d'écoulement ont généralement des communautés littorales de macrophytes peu développées, ce qui altère le potentiel écologique selon la directive européenne cadre sur l'eau. Le but de notre étude était de révéler les facteurs de contrôle de la croissance des macrophytes littoraux dans un réservoir avec un niveau d'eau fluctuant (Lipno, République tchèque). Les macrophytes ne sont pré-sents dans ce réservoir que dans la zone eulittorale i.e., la région du littoral entre les plus hauts et les plus bas niveaux d'eau saisonniers. Trois sous-zones eulittorales peuvent être distinguées : la eulittorale supérieure avec une communauté stable d'espèces pérennes avec un fort recouvrement, la eulittorale médiane avec Article published by EDP Sciences M. Krolová et al.: Knowl. Managt. Aquatic Ecosyst. (2013) 408, 07 une richesse relativement élevée d'espèces émergées et amphibies présentant des valeurs de couverture faible, et la eulittorale inférieure de végétation permanente. Couverture et composition des espèces, dans chaque sous-zone, sont principalement influencées par la durée et le moment des inondations, suivis par la limitation en nutriments et des conditions fortement réductrices dans les sédiments organiques inondés. Nos résultats soulignent l'importance écologique de la zone eulittorale dans des réservoirs à niveaux d'eau fluctuants, où la croissance des macrophytes peut être prise en compte par une gestion ciblée du niveau d'eau, ce qui aide les gestionnaires du réservoir à ...

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Redox potential dynamics in a horizontal subsurface flow constructed wetland for wastewater treatment: Diel, seasonal and spatial fluctuations

Cited by 89 publications

References 18 publications

Heavy metals in sediments from constructed wetlands treating municipal wastewater

Heavy metals in sediments from constructed wetlands treating municipal wastewater

Aerobic Toluene Degraders in the Rhizosphere of a Constructed Wetland Model Show Diurnal Polyhydroxyalkanoate Metabolism

Response of littoral macrophytes to water level fluctuations in a storage reservoir

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