A microcosm experiment to determine the consequences of magnetic microparticles application on water quality and sediment phosphorus pools

Funes, A.; Arco, Ana del; Álvarez-Manzaneda, I.; Vicente, J. De; Vicente, Inmaculada de

doi:10.1016/j.scitotenv.2016.11.120

Cited by 32 publications

(8 citation statements)

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“…Our results evidence that algal growth inhibition was higher than 80% when adding 0.5 g MPs l -1 which lastly caused extreme turbidity values (>500 NTU). However, in a real whole-lake application, these negative effects are unlikely to occur as 0.5 g MPs l -1 would correspond to extremely high P concentration (9.4 mg l -1 ) and secondly, because MPs are characterized by a fast sedimentation rate (Funes et al 2017) and so, turbidity quickly decreased with time. In fact, del Arco et al (unpublished) found that after just one hour, turbidity decreased around 40%.…”

Section: Resultsmentioning

confidence: 99%

“…Later, P can be desorbed and potentially used as a fertilizer while the bare MPs can be reused. Next, we summarize the most relevant advantages for using MPs as P adsorbent for lake restoration (de Vicente et al 2010;Funes et al 2016Funes et al , 2017Álvarez-Manzaneda et al 2017): (i) high P adsorption capacity under both batch and flow conditions; (ii) the insignificant dependence on physico-chemical conditions (redox and pH) of their P adsorption; (iii) the reduction in sedimentary P Mobile concentrations caused by their addition (under both oxic and anoxic conditions), potentially contributing to a long-term reduction in P efflux; (iv) their lesser cost in comparison to other P adsorbents (e.g. AlCl 3 •6H 2 O and Phoslock®); and (v) the low toxic effects on plankton and benthic organisms.…”

Section: Introductionmentioning

confidence: 99%

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Assessment of toxic effects of magnetic particles used for lake restoration on Chlorella sp. and on Brachionus calyciflorus

Álvarez-Manzaneda

Vicente

2017

Chemosphere

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Laboratory tests, by following standardized Organization for Economic Co-operation and Development (OECD) protocols, were run for evaluating the acute effects of iron magnetic microparticles (MPs), recently proposed for lake restoration, on Chlorella sp. (algal growth) and on the rotifer B. calyciflorus (mortality). In addition, the MPs potential indirect effects on rotifer egg bank were assessed by performing hatching rate test with B. calyciflorus cysts in contact with dissolved iron (Tot-Fe). In the algal growth test, no inhibition occurred at the two lowest MPs concentrations (0.01 and 0.05 g l) which would correspond, considering the adsorption efficiency ratio (Phosphorus: MPs), to P concentrations lower than 0.94 mg P l, much higher than typical concentrations found in natural waters. For higher MPs dose (EC for Chlorella sp. was 0.15 g l), no nutrient limitations but high turbidity and Tot-Fe values cause negative effects on algal growth. For the case of B. calyciflorus, LC was 1.63 g MPs l (corresponding to 30.7 mg P l). When analyzing Tot-Fe effect, the hatching rate of B. calyciflorus cysts was 100% for all treatments. To sum up our results for B. calyciflorus acute and chronic toxicity tests, it is extremely unlikely the mortality of adult organisms in contact with MPs as well as an affectation of the rotifer egg bank. In conclusion, it is expected that MPs addition in a real whole-lake application cause minor lethal and sublethal effects on both Chlorella sp. and B. calyciflorus.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Assessment of toxic effects of magnetic particles used for lake restoration on Chlorella sp. and on Brachionus calyciflorus

Álvarez-Manzaneda

Vicente

2017

Chemosphere

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“…All the above mentioned (Phoslock® and CFH-12®) innovative adsorbents lack of the possibility of being recovered from the lake water. In this scenario, magnetic particles (MPs) have been recently proposed for lake restoration as MPs adsorb P and later P loaded MPs can be efficiently removed from solution by applying a magnetic separation gradient (de Vicente et al, 2010(de Vicente et al, , 2011Funes et al, 2016Funes et al, , 2017aMerino-Martos et al, 2011. Therefore, the use of MPs may contribute to mitigate the two coupled and worldwide increasing problems affecting biogeochemical P cycle: (i) the eutrophication, nutrient enrichment, of aquatic ecosystems (de Jonge et al, 2002;Glibert, 2017;OECD, 1984;Withers et al, 2014) and (ii) the global reduction of P reserves (Cordell et al, 2011;Gilbert, 2009).…”

Section: Introductionmentioning

confidence: 99%

Ecotoxicity screening of novel phosphorus adsorbents used for lake restoration

et al. 2019

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“…An important downside of non-magnetic materials is that their effectiveness and longevity may depend on the physic-chemistry and the stability of the water column, ageing and crystallization of flocs or bioturbation, among others factors (Huser et al, 2016). Bare and coated magnetic nano/microparticles such as magnetite (Fe 3 O 4 ) or zero valent Fe (ZVI) have been recently proposed for P removal from freshwater bodies (de Vicente et al, 2010a;Funes et al, 2017). The recovery of the P-loaded adsorbents by applying a magnetic separation gradient is the main novelty of using magnetic adsorbents.…”

Section: Introductionmentioning

confidence: 99%

“…All these adsorbents have been previously used to efficiently remove P in laboratory/microcosms experiments (e.g. de Vicente et al, 2010a;Reitzel et al, 2013;Lyngsie et al, 2014;Lai et al, 2016;Funes et al, 2017) and, specifically Phoslock ® , at field scale (e.g. Robb et al, 2003;Meis et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

Determining major factors controlling phosphorus removal by promising adsorbents used for lake restoration: A linear mixed model approach

et al. 2018

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Phosphorus (P) removal from lake/drainage waters by novel adsorbents may be affected by competitive substances naturally present in the aqueous media. Up to date, the effect of interfering substances has been studied basically on simple matrices (single-factor effects) or by applying basic statistical approaches when using natural lake water. In this study, we determined major factors controlling P removal efficiency in 20 aquatic ecosystems in the southeast Spain by using linear mixed models (LMMs). Two non-magnetic -CFH-12 and Phoslock- and two magnetic materials -hydrous lanthanum oxide loaded silica-coated magnetite (Fe-Si-La) and commercial zero-valent iron particles (FeHQ)- were tested to remove P at two adsorbent dosages. Results showed that the type of adsorbent, the adsorbent dosage and color of water (indicative of humic substances) are major factors controlling P removal efficiency. Differences in physico-chemical properties (i.e. surface charge or specific surface), composition and structure explain differences in maximum P adsorption capacity and performance of the adsorbents when competitive ions are present. The highest P removal efficiency, independently on whether the adsorbent dosage was low or high, were 85-100% for Phoslock and CFH-12, 70-100% for Fe-Si-La and 0-15% for FeHQ. The low dosage of FeHQ, compared to previous studies, explained its low P removal efficiency. Although non-magnetic materials were the most efficient, magnetic adsorbents (especially Fe-Si-La) could be proposed for P removal as they can be recovered along with P and be reused, potentially making them more profitable in a long-term period.

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A microcosm experiment to determine the consequences of magnetic microparticles application on water quality and sediment phosphorus pools

Cited by 32 publications

References 44 publications

Assessment of toxic effects of magnetic particles used for lake restoration on Chlorella sp. and on Brachionus calyciflorus

Assessment of toxic effects of magnetic particles used for lake restoration on Chlorella sp. and on Brachionus calyciflorus

Ecotoxicity screening of novel phosphorus adsorbents used for lake restoration

Determining major factors controlling phosphorus removal by promising adsorbents used for lake restoration: A linear mixed model approach

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