Harmful Algal Blooms in Eutrophic Marine Environments: Causes, Monitoring, and Treatment

Water, Journal Year: 2024, Volume and Issue: 16(17), P. 2525 - 2525

Published: Sept. 5, 2024

Marine eutrophication, primarily driven by nutrient over input from agricultural runoff, wastewater discharge, and atmospheric deposition, leads to harmful algal blooms (HABs) that pose a severe threat marine ecosystems. This review explores the causes, monitoring methods, control strategies for eutrophication in environments. Monitoring techniques include remote sensing, automated situ sensors, modeling, forecasting, metagenomics. Remote sensing provides large-scale temporal spatial data, while sensors offer real-time, high-resolution monitoring. Modeling forecasting use historical data environmental variables predict blooms, metagenomics insights into microbial community dynamics. Control treatments encompass physical, chemical, biological treatments, as well advanced technologies like nanotechnology, electrocoagulation, ultrasonic treatment. Physical such aeration mixing, are effective but costly energy-intensive. Chemical including phosphorus precipitation, quickly reduce levels may have ecological side effects. Biological biomanipulation bioaugmentation, sustainable require careful management of interactions. Advanced innovative solutions with varying costs sustainability profiles. Comparing these methods highlights trade-offs between efficacy, cost, impact, emphasizing need integrated approaches tailored specific conditions. underscores importance combining mitigate adverse effects on

Language: Английский

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A Critical Review of Nature-Based Systems (NbS) to Treat Stormwater in Response to Climate Change and Urbanization

Current Pollution Reports, Journal Year: 2024, Volume and Issue: 10(2), P. 286 - 311

Published: March 16, 2024

Language: Английский

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Management of cyanobacteria and cyanotoxins in drinking water: A comprehensive review on occurrence, toxicity, challenges and treatment approaches

The Science of The Total Environment, Journal Year: 2025, Volume and Issue: 976, P. 179260 - 179260

Published: April 9, 2025

Language: Английский

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Microalgae as Bio-based Circular Solutions for Harmful Algal Bloom (HAB) in Lake Tegel, Berlin, Germany

Advances in water security, Journal Year: 2025, Volume and Issue: unknown, P. 343 - 372

Published: Jan. 1, 2025

Language: Английский

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Benthic cyanobacterial accumulations and associated cyanotoxins in coastal urban stormwater pond networks

Harmful Algae, Journal Year: 2025, Volume and Issue: 144, P. 102833 - 102833

Published: March 3, 2025

Language: Английский

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Subtropical stormwater ponds are more frequently net nitrogen fixing compared to natural ponds

Biogeochemistry, Journal Year: 2024, Volume and Issue: 167(8), P. 1007 - 1024

Published: June 13, 2024

Abstract Urban stormwater ponds (SWPs) are engineered ecosystems designed to prevent flooding and protect downstream by retaining nutrients associated with runoff, including nitrogen (N). Despite these expectations, multiple studies have found that SWPs low N removal efficiencies can be sources of ecosystems. To understand mechanisms controlling the fate in SWPs, we quantified dinitrogen (N 2 ) gas saturation characterize net exchange as either denitrification or N-fixation. We assessed temporal spatial patterns dynamics fifteen six naturally occurring undisturbed watersheds (Florida, USA) sampling two seasons (dry wet) from depths water column. Samples were equally likely exhibit supersaturation (net denitrification; 50%) undersaturation N-fixation; 50%). In contrast, majority (82%) samples natural supersaturated , indicating denitrification. The mean SWP air–water flux was − 1.7 μg -N m −2 h −1 (range 500 433 ), which lower than clear (40 ; range 68 74 humic (202 41 407 despite considerably higher variation SWPs. These results indicate may part due N-fixation adding new system. Overall, this study shows less effective at removing reactive environment, potentially impacting quality.

Language: Английский

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Water quality and wetland vegetation responses to water level variations in a university stormwater reuse reservoir: Nature-based approaches to campus water sustainability

The Science of The Total Environment, Journal Year: 2024, Volume and Issue: 948, P. 174616 - 174616

Published: July 9, 2024

Language: Английский

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Removal of Cyanobacterial Harmful Algal Blooms (HABs) from Contaminated Local Park Lake using Ganoderma lucidum Mycelial Pellets

Heliyon, Journal Year: 2024, Volume and Issue: 11(1), P. e41205 - e41205

Published: Dec. 15, 2024

Eutrophication and hypereutrophication in lakes foster harmful blue-green algal blooms, which pose a significant threat to the ecological health of freshwater reservoirs. This study investigated effectiveness bio-flocculation approach using Ganoderma lucidum fungus strain BGF4A1 remove these specifically targeting cyanobacterial species like Microcystis PCC-7914. Key flocculation parameters, concentrations, adsorption kinetics, pellet morphology were explored this research. Our results demonstrate that G. can effectively up 93.70 % cyanobacteria (measured as chlorophyll-a absorbance), 75.28 chemical oxygen demand (COD), 92.09 total suspended solids (TSS) under optimal conditions: an initial pH 4, 1 fungal volume (w/v), 48 h contact time, 100 rpm agitation at room temperature. Microscopic examination water samples before after treatment confirmed reduction colonies, indicating death or decline targeted organisms. Morphological analysis field emission scanning electron microscopy (FESEM) revealed cells deposited on hyphae pellets, contrast smooth surface control pellets. These novel culture technologies show great promise bio-flocculating agents for removing algae potentially be adapted microalgae harvesting biodiesel production.

Language: Английский

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Nitrogen Availability and Denitrification in Urban Agriculture and Regreened Vacant Lots

EarthArXiv (California Digital Library), Journal Year: 2024, Volume and Issue: unknown

Published: Feb. 8, 2024

Many cities demolish abandoned homes and create regreened vacant lots (RVLs), an increasingly popular, high-intensity use of RVLs is as urban agriculture (UA) sites. UA may potentially result in higher nitrogen (N) runoff to aquatic ecosystems, but this potential has not been quantified. We examined the role that varying land reuse intensity plays determining for N export via or leaching, focusing on soil availability removal capacity denitrification. contrasted three levels parcels: intact properties, turfgrass RVLs, Buffalo, NY. C availability, denitrification potential, isotopic evidence Land only affected properties surficial horizons. Total was 2.5x soils (mean = 0.51%) than non-UA 0.21%). Soil nitrate 2.6x winter 12.4 μg NO3--N g-1) summer 4.7 generally soils. Despite at sites, there were no differences between sites 620 ng N2O-N g-1 h-1). Isotopic further confirms a major sink N. Although had high compared low rates denitrification, moderate runoff-driven export, concentrations substantially lower values typical conventional agricultural

Language: Английский

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Demonstration of Proactive Algaecide Treatments Targeting Overwintering Cyanobacteria in Sediments of an Urban Pond

Water, Journal Year: 2024, Volume and Issue: 16(11), P. 1624 - 1624

Published: June 6, 2024

Most cyanobacteria that form harmful algal blooms (HABs) in inland waterbodies can overwinter sediments. This field demonstration within an urban pond was conducted to bolster a database on the novel use of algaecide treatments proactively target overwintering located sediments prior HAB formation. In March 2023, peroxide-based applied water feature Kansas City, Kansas, and responses were measured over subsequent weeks months. Multiple lines evidence used discern impacts proactive cells severity throughout growing season. Although results cyanobacterial mixed, three five indicated effective at decreasing transfer column during months when HABs tended occur. Microcystin concentrations immediately post-treatment (hours) remained analytical detection limit (0.10 µg/L) below USEPA risk-based thresholds, highlighting benefits application exponential growth phase toxin-producing cyanobacteria. These expand dataset methodology for field-scale applications targeting sediment mitigate delay development.

Language: Английский

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