Fungal removal of cyanotoxins in constructed wetlands: The forgotten degraders

The Science of The Total Environment, Journal Year: 2024, Volume and Issue: 929, P. 172590 - 172590

Published: April 18, 2024

Harmful cyanobacterial blooms have increased globally, releasing hazardous cyanotoxins that threaten the safety of water resources. Constructed wetlands (CWs) are a nature-based and low-cost solution to purify remove from water. However, bio-mechanistic understanding biotransformation processes expected drive cyanotoxin removal in such systems is poor, primarily focused on bacteria. Thus, present study aimed at exploring fungal contribution microcystin-LR cylindrospermopsin biodegradation CWs. Based CW mesocosms, two experimental approaches were taken: a) amplicon sequencing studies conducted investigate involvement community; b) isolates tested for their degradation capabilities. The data uncovered effects seasonality (spring or summer), exposure, vegetation (unplanted, Juncus effusus Phragmites australis) substratum (sand gravel) community structure. Additionally, arbuscular mycorrhizal fungus Rhizophagus endophyte Myrmecridium showed positive correlations with removal. Fungal revealed microcystin-LR-removal potentials approximately 25 % vitro experiments, while extracellular chemical fingerprint cultures suggested potential intracellular metabolization. results this may help us understand removal, as well ecology

Language: Английский

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The photoactivity of complexation of DOM and Fe(Ⅱ)/Mn(Ⅱ) in aquatic system: Implication on the photodegradation of MCLR

Journal of environmental chemical engineering, Journal Year: 2025, Volume and Issue: unknown, P. 116703 - 116703

Published: April 1, 2025

Language: Английский

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A Data-Driven Analysis to Identify Research Hotspots and Trends in the Treatment of Algal Toxins in Water Environment

Current Pollution Reports, Journal Year: 2025, Volume and Issue: 11(1)

Published: May 13, 2025

Language: Английский

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Eco-friendly management of harmful cyanobacterial blooms in eutrophic lakes through vertical flow multi-soil-layering technology

Journal of Hazardous Materials, Journal Year: 2024, Volume and Issue: 470, P. 134281 - 134281

Published: April 16, 2024

Language: Английский

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Small-scale experiments: Using mesocosms and microcosms for testing hypotheses in treatment wetland research

Ecological Engineering, Journal Year: 2024, Volume and Issue: 208, P. 107378 - 107378

Published: Sept. 2, 2024

Language: Английский

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Horizontal-flow Constructed Wetlands for the Remediation of Cylindrospermopsin and Microcystin-lr: a Story of Plants, Microbes, and Biodegradation Pathways

SSRN Electronic Journal, Journal Year: 2024, Volume and Issue: unknown

Published: Jan. 1, 2024

Cyanobacterial harmful blooms will be more intense and frequent in the future contaminating surface waters with cyanotoxins, posing a threat already vulnerable communities heavily reliant on water usage for crop irrigation. Constructed wetlands (CWs) are proposed to ensure safe irrigation, but research is needed before implementation. The present study operated 28 mesocosms continuous mode mimicking horizontal sub-surface flow CWs. Mesocosms were fed synthetic eutrophic lake spiked two microcystin-LR (MC-LR) cylindrospermopsin (CYN), at environmentally relevant cyanotoxins concentrations (10 µg L-1). influence of various design factors, including plant species, porous media type, seasonality, was explored. achieved maximum MC-LR CYN mass removal rates 95 % 98 %, respectively. reported first time CWs Interestingly, planted-mesocosms consistently delivered higher both cyanotoxins. Phragmites australis-planted exhibited superior efficiency, while Juncus effusus yielded effluent lowest concentration due lower evapotranspiration. Using P-k-C* model, different scaling-up scenarios calculated, being best compromise piloting an area 6 – 36 m2 per m3 treated day. Additionally, bacterial communities' structure analyzed through correlation matrices differential taxa analyses, offering promising insights into their fundamental role. Nevertheless, attempts validate biotransformation via known mlrA gene degradation pathway unfruitful, indicating alternative enzymatic pathways occurring such complex CW systems. Further investigation precise molecular mechanisms identification transformation products comprehensive understanding cyanotoxin mitigation CW. All all, this points towards feasibility employed controlling irrigation or recreational waters.

Language: Английский

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Saturated constructed wetlands for the remediation of cylindrospermopsin and microcystin-LR: Plants, microbes, and biodegradation pathways

The Science of The Total Environment, Journal Year: 2024, Volume and Issue: 948, P. 174745 - 174745

Published: July 18, 2024

Harmful cyanobacterial blooms will be more intense and frequent in the future, contaminating surface waters with cyanotoxins posing a threat to communities heavily reliant on water usage for crop irrigation. Constructed wetlands (CWs) are proposed ensure safe irrigation, but research is needed before implementation. The present study operated 28 mesocosms continuous mode mimicking horizontal sub-surface flow CWs. Mesocosms were fed synthetic lake spiked periodically two cyanotoxins, microcystin-LR (MC-LR) cylindrospermopsin (CYN), at environmentally relevant concentrations (10 μg L−1). influence of various design factors, including plant species, porous media, seasonality, was explored. achieved maximum MC-LR CYN mass removal rates 95 % 98 %, respectively. reported first time CWs Planted consistently outperformed unplanted mesocosms, Phragmites australis exhibiting superior cyanotoxin compared Juncus effusus. Considering evapotranspiration, J. effusus yielded least cyanotoxin-concentrated effluent due lower losses comparison P. australis. Using P-kC* model, different scaling-up scenarios future piloting calculated discussed. Additionally, bacterial community structure analyzed through correlation matrices differential taxa analyses, offering valuable insights into their cyanotoxins. Nevertheless, attempts validate biotransformation via known mlrA gene degradation pathway unfruitful, indicating alternative enzymatic pathways occurring such complex CW systems. Further investigation precise molecular mechanisms identification transformation products comprehensive understanding mitigation CW. This points towards feasibility employed control irrigation or recreational waters.

Language: Английский

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Assessment of Cyanotoxins Removal Efficiency Using a Simulated Drinking Water Treatment Process for Downstream Source Water of the Nakdong River

Journal of Korean Society of Environmental Engineers, Journal Year: 2024, Volume and Issue: 46(11), P. 714 - 724

Published: Nov. 22, 2024

Objectives : This study aims to evaluate the removal rates of nine cyanotoxins produced by cyanobacteria using a laboratory-scale simulated drinking water treatment process (DWTP), providing useful data for DWTP operations during algal blooms.Methods A lab-scale was used under typical operating conditions, including specific chemical dosages and contact times. The employed chlorine ozone, as well powdered activated carbon (PAC) biological (BAC).Results Discussion According experimental results efficiency chlorination ozonation, microcystin-LR (MC-LR), MC-RR, MC-LA, MC-LF, MC-LY, MC-YR, cylindrospermopsin (CYN), nodularin (NOD) were effectively removed within ranges pre- post-chlorine post-ozone concentrations in DWTP. However, anatoxin-a (ANA) exhibited significantly lower efficiency. evaluation PAC indicated that MC-LY had low rates. In contrast, other six achieved over 50% when above 25 mg/L times exceeded 30 minutes. rate BAC showed conditions with an empty bed time (EBCT) more than 5 minutes, 70% removed. When EBCT 2 reached between 95% 100%. process, MC-RR primarily facilitated biodegradation, while CYN mainly through adsorption.Conclusion Due climate change, bloom periods various domestic sources are gradually increasing, resulting rising trend both frequency concentration detected cyanotoxins. evaluated DWTPs, focusing on chlorine/ozone (oxidation), (adsorption), (adsorption biodegradation). different DWTPs at facility act multiple barriers, removing upon their introduction.

Language: Английский

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Highly efficient photocatalytic Microcystin-LR elimination using magnetic recyclable nanocomposite ZnO/Fe3O4/Bi2WO6/RGO and its toxicity assessment

Journal of environmental chemical engineering, Journal Year: 2024, Volume and Issue: unknown, P. 115161 - 115161

Published: Dec. 1, 2024

Language: Английский

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