Eutrophication management in surface waters using lanthanum modified bentonite: A review

Copetti, Diego; Finsterle, Karin; Marziali, Laura; Stefani, Fabrizio; Tartari, Gianni; Douglas, Grant; Reitzel, Kasper; Spears, Bryan M.; Winfield, Ian J.; Crosa, Giuseppe; D’Haese, Patrick C.; Yasseri, Said; Lürling, Miquel

doi:10.1016/j.watres.2015.11.056

Cited by 285 publications

(122 citation statements)

References 83 publications

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“…3,27,44,45 For a marine squid, however, REE concentrations did not significantly differ between organs and muscle. 44 There is currently little available information on the cellular mechanisms of tissue-specific REE bioaccumulation.…”

Section: Tissue-specific Ree Bioaccumulationmentioning

confidence: 80%

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Rare earth elements (REE) in freshwater, marine, and terrestrial ecosystems in the eastern Canadian Arctic

MacMillan

Chételat

Heath

et al. 2017

Preprint

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Few ecotoxicological studies exist for rare earth elements (REEs), particularly fieldbased studies on their bioaccumulation and food web dynamics. REE mining has led to significant environment impacts in several countries (China, Brazil, U.S.), yet little is known about the fate and transport of these contaminants of emerging concern. To understand how REEs behave in pristine northern food webs, we measured REE concentrations and carbon and nitrogen stable isotope ratios (∂ 15 N, ∂ 13 C) in biota from marine, freshwater, and terrestrial ecosystems of the eastern Canadian Arctic (N=339). Northern ecosystems are potentially vulnerable to REE enrichment from prospective mining projects at high latitudes. Wildlife harvesting and tissue sampling was partly conducted by local hunters through a communitybased monitoring project. Results show that REE generally follow a coherent bioaccumulation pattern for sample tissues, with some anomalies for redox-sensitive elements (Ce, Eu). Highest REE concentrations were found at low trophic levels, especially in vegetation and aquatic invertebrates. Terrestrial herbivores, ringed seal, and fish had low REE levels in muscle tissue (<0.1 nmolg -1 ), yet accumulation was an order of magnitude higher in all liver tissues. Age-and length-dependent REE accumulation also suggest that REE uptake is faster than elimination for some species. Overall, REE bioaccumulation patterns appear to be species-and tissue-species, with limited potential for biomagnification. This study provides novel ecotoxicological data on the behaviour of REE in ecosystems and will be useful for environmental impact assessment of REE enrichment in northern regions.peer-reviewed)

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Section: Tissue-specific Ree Bioaccumulationmentioning

confidence: 80%

“…3,4 Increasing emissions have led to significant release of REEs into the environment, yet knowledge of their fate and impact on natural ecosystems is limited. Most existing studies use REEs to trace geochemical processes in natural systems and very few studies have examined the ecotoxicology and/or environmental impacts of these metals.…”

Section: Introductionmentioning

confidence: 99%

Rare earth elements (REE) in freshwater, marine, and terrestrial ecosystems in the eastern Canadian Arctic

MacMillan

Chételat

Heath

et al. 2017

Preprint

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“…Positively charged and potentially toxic La species were not predicted in a scenario with carbonate or fulvic acids present. Since both are present in natural waters, the risk associated with trivalent La ions seems negligible, which is supported by a huge array of experiments and field observations [16].…”

Section: Discussionmentioning

confidence: 82%

“…Hence, if we ran the enclosure experiment for 358 days instead of 58 days, the outcome of the LMB-treated enclosures could have been different. The best time for treating water with LMB is winter in temperate regions, because most water column P will be present as phosphate and not inside cells and pH is generally lower [16]. In our enclosure experiment, the water was already suffering from a cyanobacteria bloom and under such conditions inclusion of a coagulant to precipitate the cells is highly recommended [20].…”

Section: Discussionmentioning

confidence: 97%

Effects of Dredging and Lanthanum-Modified Clay on Water Quality Variables in an Enclosure Study in a Hypertrophic Pond

Waajen

Engels²,

Oosterhout

2017

Water

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An enclosure experiment was conducted between July and September 2009 to compare the effectiveness of a phosphate fixative, the lanthanum-modified bentonite clay Phoslock ® (LMB), dredging, and their combination in controlling eutrophication in a hypertrophic urban pond in Heesch, The Netherlands. In total, 25 water quality variables were monitored. Multivariate analysis revealed that the combination LMB-treated and dredged enclosures deviated most from the pond (reference) and the controls, and showed the strongest eutrophication reduction. Overall, dredging significantly increased transparency, lowered turbidity, and improved the oxygen conditions in the enclosures compared to non-dredged ones. Nonetheless, one dredged enclosure deviated dramatically from the others, which might reflect methodological issues with dredging. The LMB treatment appeared to be less effective at mitigating eutrophication than dredging, and phosphate concentrations even increased during the experiment in the LMB-treated enclosures. Chemical equilibrium modeling suggested that humic substances could have formed complexes with lanthanum (La) from the LMB, rendering it unavailable for intercepting P over the course of the enclosure experiment. Residual lanthanum concentrations in combination dredging and LMB treatments exceeded the Dutch standard 10-fold. Total zooplankton abundance, and particularly Cladocera, increased in all enclosures over the course of the experiment. The limited effect of LMB in the enclosure experiment and the violation of the Dutch La standard when combined with dredging disqualify LMB as an intervention agent in the restoration of the pond.

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“…Related to lake management, one of the only cases which is well documented is related to the use of brick powder (which plays the role of a nitrate-storing compound) to reduce phosphorus release from sediments and thus decrease the eutrophication of lakes (cf. instance [3] or [1] for recent reviews on the subject). Another field where the use of a recirculation system makes it very similar to that considered in the present paper is aquaculture.…”

Section: Introductionmentioning

confidence: 99%

Modeling and control of in-situ decontamination of large water resources

et al. 2017

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Abstract.We address the problem of the optimal control of in situ decontamination of water resources. We review several modeling, simulation and optimization techniques for this problem and their results. We show the benefit of combining tools from finite dimensional optimal control theory and numerical simulations of hydrodynamics equations, for providing simple and efficient feedback strategies.Résumé. Nous considérons le problème de commande optimale d'une décontamination in situ de ressources hydriques. Nous passons en revue différentes techniques de modélisation, simulation et optimisation pour ce problème, ainsi que leurs résultats. Nous montrons le bénéficeà combiner les outils de la théorie de la commande optimale en dimension finie avec la simulation numérique deś equations de l'hydrodynamique, afin de fournir des stratégies par retour d'étatà la fois simples et efficaces.

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Eutrophication management in surface waters using lanthanum modified bentonite: A review

Cited by 285 publications

References 83 publications

Rare earth elements (REE) in freshwater, marine, and terrestrial ecosystems in the eastern Canadian Arctic

Rare earth elements (REE) in freshwater, marine, and terrestrial ecosystems in the eastern Canadian Arctic

Effects of Dredging and Lanthanum-Modified Clay on Water Quality Variables in an Enclosure Study in a Hypertrophic Pond

Modeling and control of in-situ decontamination of large water resources

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