Effects of nZVI dosing on the improvement in the contaminant removal performance of constructed wetlands under the dye stress

Zhao, Yaping; Zhao, Zhimiao; Song, Xinshan; Jiang, Xingyi; Wang, Yuhui; Cao, Xin; Si, Zhihao; Pan, Fanfeng

doi:10.1016/j.scitotenv.2019.134789

Cited by 23 publications

(6 citation statements)

References 38 publications

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“…Additionally, an increasing body of research has linked the functional genes of Nremoving microbes to their operational and quantitative analyses [134,135,149].…”

Section: Biological Removal Mechanism(s)mentioning

confidence: 99%

Integrated Phytobial Remediation of Dissolved Pollutants from Domestic Wastewater through Constructed Wetlands: An Interactive Macrophyte-Microbe-Based Green and Low-Cost Decontamination Technology with Prospective Resource Recovery

Thakur,

Barya,

Dutta

et al. 2023

Water

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Macrophytes have the potential to withstand pollutant-induced stress and can be used to clean contaminated water using phyto-extraction, phyto-degradation, phyto-filtration, phyto-stimulation, and phyto-volatilization technique(s). Phytoremediation through constructed wetlands (CWs) for eliminating inorganic and organic pollutants from household sewage and wastewater has attracted scientific attention. CWs are artificially engineered treatment systems that utilize natural cycles or processes involving soils, wetland vegetation, and plant and soil-associated microbial assemblages to remediate contaminated water and improve its quality. Herein, we present a detailed assessment of contaminant removal effectiveness in different CW systems, i.e., free-water surface or surface-flow constructed wetlands (FWSCWs/SFCWs), subsurface-flow constructed wetlands (SSFCWs), and hybrid constructed wetlands (HCWs). Several wetland floral species have been reported as potential phytoremediators, effectively reducing aquatic contamination through biodegrading, biotransforming, and bioaccumulating contaminants. Water hyacinth (Pontederia crassipes) is one of the most resistant macrophytes, capable of tolerating high nitrate (NO3−) and phosphate (PO42−) concentrations. Other aquatic weeds also effectively alleviate biological oxygen demand (BOD), chemical oxygen demand (COD), total dissolved solids (TDS), and pathogen levels and ameliorate the impact of different ionic forms of nitrogen (N), phosphorus (P), and trace elements (TEs). The review primarily focuses on using hydrophyte(s)-microbe(s) associations in different CWs as an essential phytoremediation tool for sustainable management of freshwater ecosystems, ecorestoration, and prospective resource recovery, favoring a circular bioeconomy (CBE).

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“…Additionally, an increasing body of research has linked the functional genes of Nremoving microbes to their operational and quantitative analyses [134,135,149].…”

Section: Biological Removal Mechanism(s)mentioning

confidence: 99%

Integrated Phytobial Remediation of Dissolved Pollutants from Domestic Wastewater through Constructed Wetlands: An Interactive Macrophyte-Microbe-Based Green and Low-Cost Decontamination Technology with Prospective Resource Recovery

Thakur,

Barya,

Dutta

et al. 2023

Water

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“…In addition, there is now a growing number of studies linking functional genes to the functional and quantitative analysis of nitrogen removal microorganisms ( Zhao et al, 2020d ; Tan et al, 2021b ; Zhang et al, 2021b ). For example, the abundance of nrfA - and nirK -carrying microorganisms influenced the denitrification performance of CWs ( Zhao et al, 2020d ); the abundance of the nitrification functional genes amoA -AOA, amoA -AOB, and nxrA represented the growth status of nitrifying bacteria ( Zhao et al, 2021 ). Currently, the functional gene pools associated with the various processes of nitrogen removal (e.g., nitrification, denitrification, anammox, and DNRA) have been summarized ( Tan et al, 2021a , b ; Zhang et al, 2021b ).…”

Section: Functional Microorganisms In Nitrogen Removalmentioning

confidence: 99%

A Review on Microorganisms in Constructed Wetlands for Typical Pollutant Removal: Species, Function, and Diversity

Wang

Long

et al. 2022

Front. Microbiol.

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Constructed wetlands (CWs) have been proven as a reliable alternative to traditional wastewater treatment technologies. Microorganisms in CWs, as an important component, play a key role in processes such as pollutant degradation and nutrient transformation. Therefore, an in-depth analysis of the community structure and diversity of microorganisms, especially for functional microorganisms, in CWs is important to understand its performance patterns and explore optimized strategies. With advances in molecular biotechnology, it is now possible to analyze and study microbial communities and species composition in complex environments. This review performed bibliometric analysis of microbial studies in CWs to evaluate research trends and identify the most studied pollutants. On this basis, the main functional microorganisms of CWs involved in the removal of these pollutants are summarized, and the effects of these pollutants on microbial diversity are investigated. The result showed that the main phylum involved in functional microorganisms in CWs include Proteobacteria, Bacteroidetes, Actinobacteria and Firmicutes. These functional microorganisms can remove pollutants from CWs by catalyzing chemical reactions, biodegradation, biosorption, and supporting plant growth, etc. Regarding microbial alpha diversity, heavy metals and high concentrations of nitrogen and phosphorus significantly reduce microbial richness and diversity, whereas antibiotics can cause large fluctuations in alpha diversity. Overall, this review can provide new ideas and directions for the research of microorganisms in CWs.

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“…Considering the high toxicity and lethal effects of copper on life, several researchers have proposed many effective ways of removing copper from wastewater and groundwater [3,[8][9][10][11][12][13][14] . Among the proposed removal techniques (ion exchange, adsorption, complexation, electrodialysis, membrane technology, bioremediation, solvent extraction and chemical treatment), nanotechnology is the most efficient and effective [15][16][17][18][19] Nanoscale zero-valent iron (nZVI) has been employed extensively to remove contaminants such as dyes [20,21] , nitrates [22,23] , heavy metals [24][25][26][27] , chloro-organic compounds [28][29][30] , chlorinated pesticides and organophosphates [31,32] from wastewater and groundwater. Its removal mechanisms during reaction with heavy metals include adsorption (Zn, Cd, Ni, Pb, Cr, Co, Se, Ba, U, As), reduction (Cu, U, As, Pt, Hg, Ni, Ag, Pb, Cr), precipitation (Cd, Cu, Pb, Co, Zn), co-precipitation (Cd, Co, Cu, Zn, Pb), oxidation (Se, Pb, As, U), chemisorption and diffusion through pores [33][34][35] .…”

Section: Introductionmentioning

confidence: 99%

An insight into the fate of Cu2+ and zero-valent iron during removal of Cu2+ by nanoscale zero-valent iron

Anang¹,

Liu²,

Fan³

2023

Water Emerg Contam & Nanoplastics

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Aim: The transformation of zero-valent iron (Fe0) and Cu2+ during Cu2+ removal by nanoscale zero-valent iron (nZVI) has not been properly investigated using modern analytical techniques, despite its importance in environmental toxicology and surface chemistry associated with wastewater treatment/groundwater remediation. This study critically examines the phenomenon using a variety of modern instruments that characterize the physical and chemical properties of materials and provides extensive comprehension of the subject. Methods: As-prepared nZVI was used to remove Cu2+ in 5 mmol/L CuSO4. The morphological and structural characteristics of the Cu2+ and nZVI after removal were investigated with the aid of scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD) and X-ray photoelectron spectrometry (XPS). Results: Complete removal of Cu2+ by the nZVI was achieved within 60 min and remained constant till 120 min. The Cu2+ got reduced into cuprite (Cu2O) and copper metal (Cu0) (the crystals of both transformation products were cubic), while the Fe0 nanoparticles transformed into lath-like lepidocrocite (γ-FeOOH) and twin-rod goethite (α-FeOOH). The mechanism of Fe0 transformation was that the Fe2+ produced by Fe0 corrosion and oxidation by Cu2+ was hydrolyzed and oxidized to form hydropyrite, which was later converted into lepidocrocite and goethite with the assistance of Fe2+. The transformation of Cu2+ was due to the strong reduction property of Fe0. The toxicity and bioavailability of the transformed products were lower than those of Cu2+ and Fe0 nanoparticles. Conclusion: The findings are critical in understanding the fate of Fe0 nanoparticles and Cu2+ during Cu2+ removal by nZVI and can provide guidance for the application of nZVI technology.

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Effects of nZVI dosing on the improvement in the contaminant removal performance of constructed wetlands under the dye stress

Cited by 23 publications

References 38 publications

Integrated Phytobial Remediation of Dissolved Pollutants from Domestic Wastewater through Constructed Wetlands: An Interactive Macrophyte-Microbe-Based Green and Low-Cost Decontamination Technology with Prospective Resource Recovery

Integrated Phytobial Remediation of Dissolved Pollutants from Domestic Wastewater through Constructed Wetlands: An Interactive Macrophyte-Microbe-Based Green and Low-Cost Decontamination Technology with Prospective Resource Recovery

A Review on Microorganisms in Constructed Wetlands for Typical Pollutant Removal: Species, Function, and Diversity

An insight into the fate of Cu2+ and zero-valent iron during removal of Cu2+ by nanoscale zero-valent iron

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