Sulfate removal and sulfur transformation in constructed wetlands: The roles of filling material and plant biomass

Chen, Yi; Wen, Yue; Zhou, Qi; Huang, Jingang; Vymazal, Jan; Kuschk, Peter

doi:10.1016/j.watres.2016.07.001

Cited by 101 publications

(47 citation statements)

References 36 publications

(63 reference statements)

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“…Sulfate removal efficiencies in CW is still unclear, some authors report low or negligible removal [54] while other studies reported high rates of sulfate removal [43,55]. It has been reported that the presence of T. latifolia had a marginal effect on sulfate removal, but its carbon-rich litter greatly promoted sulfate removal [56].…”

Section: Factors Involved In Metal Uptake Efficiencies By Plantsmentioning

confidence: 99%

Review of Constructed Wetlands for Acid Mine Drainage Treatment

Pat-Espadas

Loredo-Portales

Amábilis-Sosa

et al. 2018

Water

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The mining industry is the major producer of acid mine drainage (AMD). The problem of AMD concerns at active and abandoned mine sites. Acid mine drainage needs to be treated since it can contaminate surface water. Constructed wetlands (CW), a passive treatment technology, combines naturally-occurring biogeochemical, geochemical, and physical processes. This technology can be used for the long-term remediation of AMD. The challenge is to overcome some factors, for instance, chemical characteristics of AMD such a high acidity and toxic metals concentrations, to achieve efficient CW systems. Design criteria, conformational arrangements, and careful selection of each component must be considered to achieve the treatment. The main objective of this review is to summarize the current advances, applications, and the prevalent difficulties and opportunities to apply the CW technology for AMD treatment. According to the cited literature, sub-surface CW (SS-CW) systems are suggested for an efficient AMD treatment. The synergistic interactions between CW components determine heavy metal removal from water solution. The microorganism-plant interaction is considered the most important since it implies symbiosis mechanisms for heavy metal removal and tolerance. In addition, formation of litter and biofilm layers contributes to heavy metal removal by adsorption mechanisms. The addition of organic amendments to the substrate material and AMD bacterial consortium inoculation are some of the strategies to improve heavy metal removal. Adequate experimental design from laboratory to full scale systems need to be used to optimize equilibria between CW components selection and construction and operational costs. The principal limitations for CW treating AMD is the toxicity effect that heavy metals produce on CW plants and microorganisms. However, these aspects can be solved partially by choosing carefully constructed wetlands components suitable for the AMD characteristics. From the economic point of view, a variety of factors affects the cost of constructed wetlands, such as: detention time, treatment goals, media type, pretreatment type, number of cells, source, and availability of gravel media, and land requirements, among others.

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Section: Factors Involved In Metal Uptake Efficiencies By Plantsmentioning

confidence: 99%

Review of Constructed Wetlands for Acid Mine Drainage Treatment

Pat-Espadas

Loredo-Portales

Amábilis-Sosa

et al. 2018

Water

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“…To date, all microorganisms mediating S-driven autotrophic denitrification have been affiliated with a-, ß-, -, and 3-Proteobacteria (Shao et al 2010). Among them, Thiobacillus dentrificans and Sulfurimonas denitrificans are the most commonly studied and applied sulfide-dependent denitrifiers (Trouve et al 1998;Beller et al 2006aBeller et al , 2006bSievert et al 2008;Chen et al 2016).…”

Section: Sulfur Oxidizers Functioning As Denitrifying Bacteriamentioning

confidence: 99%

Biogeochemical sulfur cycling coupling with dissimilatory nitrate reduction processes in freshwater sediments

Zhu

et al. 2018

Environ. Rev.

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Dissimilatory nitrate reduction processes including denitrification, anaerobic ammonium oxidation (ANAMMOX), and dissimilatory nitrate reduction to ammonium (DNRA) are crucial nitrogen (N) cycling pathways in freshwater ecosystems. Denitrification has long been considered as the primary pathway of N loss from aquatic environments. Recently, ANAMMOX and DNRA have been gaining more attention in N dynamics at the sediment–water interface. The ubiquitous presence of various sulfur (S) species in sediments makes them an important role on N transport. Interactions between dissimilatory nitrate reduction and the S cycle are mainly embodied by the inhibitory or promoting effects of sulfide on nitrate-reducing pathways, as well as the competition of sulfate with nitrate reduction for substrates. This review summarizes the current progress in the coupling of S cycling with nitrate-reducing pathways in freshwater sediments, the distribution and diversity of related microorganisms, as well as the functional genes encoding related enzymes. Future perspectives of related research are discussed in terms of coupled N cycling with other element cycles and molecular detection of functional bacteria to better understand and manipulate N cycling in freshwater environments.

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“…However, high concentrations of the chemicals are generally required for achieving significant decrease of cell retention. Many of these chemicals are resistant to biodegradation and have been considered as contaminants (e.g., SDS and SDBS), raising an issue of secondary pollution after the bioaugmentation effort [ Chen et al ., ; Cserháti et al ., ; Li et al ., ; Liwarska‐Bizukojc et al ., ]. In contrast, biosurfactants (surfactants produced by microbes) possess advantages of biodegradability and low toxicity [ Gautam and Tyagi , ; Liu et al ., ], and thus are more environmentally compatible.…”

Section: Introductionmentioning

confidence: 99%

Effect of low‐concentration rhamnolipid biosurfactant on Pseudomonas aeruginosa transport in natural porous media

Liu

Zhong

Jiang

et al. 2017

Water Resources Research

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Enhanced transport of microbes in subsurface is a focus in bioaugmentation applications for remediation of groundwater. In this study, the effect of low‐concentration monorhamnolipid biosurfactant on transport of Pseudomonas aeruginosa ATCC 9027 in natural porous media (silica sand and a sandy soil) with or without hexadecane as the nonaqueous phase liquids (NAPLs) was studied with miscible‐displacement experiments using artificial groundwater as the background solution. Transport of two types of cells was investigated, glucose‐grown and hexadecane‐grown cells with lower and higher cell surface hydrophobicity (CSH), respectively. A clean‐bed colloid deposition model was used to calculate deposition rate coefficients (k) for quantitative assessment on the effect of the rhamnolipid on the transport. In the absence of NAPLs, significant cell retention was observed in the sand (81% and 82% for glucose‐grown and hexadecane‐grown cells, respectively). Addition of low‐concentration rhamnolipid enhanced cell transport, with 40 mg/L of rhamnolipid reducing retention to 50% and 60% for glucose‐grown and hexadecane‐grown cells, respectively. The k values for both glucose‐grown and hexadecane‐grown cells correlated linearly with rhamnolipid‐dependent CSH quantitatively measured using a bacterial‐adhesion‐to‐hydrocarbon method. Retention of cells by the soil was nearly complete (>99%). Forty milligrams per liter of rhamnolipid reduced the retention to 95%. The presence of NAPLs in the sand enhanced the retention of hexadecane‐grown cells with higher CSH. Transport of cells in the presence of NAPLs was enhanced by rhamnolipid at all concentrations tested, and the relative enhancement was greater than in the absence of NAPLs. This study shows the importance of hydrophobic interaction on bacterial transport in natural porous media and the potential of using low‐concentration rhamnolipid for facilitating cell transport in subsurface for bioaugmentation efforts.

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Sulfate removal and sulfur transformation in constructed wetlands: The roles of filling material and plant biomass

Cited by 101 publications

References 36 publications

Review of Constructed Wetlands for Acid Mine Drainage Treatment

Review of Constructed Wetlands for Acid Mine Drainage Treatment

Biogeochemical sulfur cycling coupling with dissimilatory nitrate reduction processes in freshwater sediments

Effect of low‐concentration rhamnolipid biosurfactant on Pseudomonas aeruginosa transport in natural porous media

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