Assessment of possible solid-phase phosphate sorbents to mitigate eutrophication: Influence of pH and anoxia

Mucci, Maíra; Maliaka, Valentini; Noyma, Natália Pessoa; Marinho, Marcelo Manzi; Lürling, Miquel

doi:10.1016/j.scitotenv.2017.11.198

Cited by 45 publications

(40 citation statements)

References 53 publications

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“…However, there is the possibility of being affected by the redox potential, especially in the bottom of the eutrophic system which is anoxic. 63 It can thus reduce the iron(III) to iron(II) with the release of adsorbed phosphate.…”

Section: Discussionmentioning

confidence: 99%

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Phosphate Adsorption by Montmorillonites Modified with Lanthanum/Iron and a Laboratory Test using Water from the Jacarepaguá Lagoon (RJ, Brazil)

Castro

Brandão

Bertolino

et al. 2018

J. Braz. Chem. Soc.

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Montmorillonites modified with lanthanum(III) and iron(III) were prepared from two commercial clays. These materials were characterized by powder X-ray diffraction analysis, X-ray fluorescence, infrared spectroscopy, N 2 adsorption, and scanning electron microscopy. The incorporation of lanthanum(III) and iron(III) varied from 0 to 4.00%. The amount of these cations governed the adsorption capacity of the material since an increase in the percentage of La by 1.7 times improved the adsorption capacity by 3.3 times. The structural properties of the precursor clay minerals, such as pore size, may have influenced the extension of the modification process. Kinetics and equilibrium studies indicated that adsorption occurs mainly within 24 h, and the pseudo-second order and Lagmuir models described the process. The phosphate adsorption capacity ranged from 2.86 to 17.86 mg g-1 for the modified materials and was mainly dependent on the La content. A laboratory test with a natural water sample from the Jacarepaguá Lagoon showed reduction of the soluble reactive phosphorus concentration from 0.41 to 0.04 mg L-1 , for the material with 4.00% La 2 O 3. The materials described in this work were effective for the reduction of the soluble reactive phosphate, contributing to the research of a national product destined to the restoration of eutrophic aquatic environments.

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Section: Discussionmentioning

confidence: 99%

“…A disadvantage for our material is the possibility of the environment redox potential to affect the adsorption capacity of phosphate. 63 Generally, in a eutrophic environment, the dissolved oxygen value is low and iron(III) may be reduced to iron(II) with the release of the phosphate adsorbed into the water.…”

Section: -mentioning

confidence: 99%

Phosphate Adsorption by Montmorillonites Modified with Lanthanum/Iron and a Laboratory Test using Water from the Jacarepaguá Lagoon (RJ, Brazil)

Castro

Brandão

Bertolino

et al. 2018

J. Braz. Chem. Soc.

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“…Lanthanum is not redox sensitive and has strong affinity for phosphate with which it precipitates as the LaPO 4 mineral -rhabdophane (K sp = 10 -24.7 to 10 -25.7 mol 2 l −2 ) (Johannesson and Lyons, 1994;Liu and Byrne, 1997). Rhabdophane is stable at least in the pH range 5-9 (Copetti et al, 2016); LMB showed excellent phosphate removal when tested in the pH range 6-9 (Mucci et al, 2018).…”

Section: Geo-engineering Using Lmbmentioning

confidence: 99%

Coagulation and precipitation of cyanobacterial blooms

Lürling

Kang

Mucci

et al. 2020

Ecological Engineering

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Eutrophication is the prime water quality issue in inland waters. Eutrophication and its key symptom, harmful cyanobacterial blooms, is expected to further increase in the future, which highlights the importance of managing the issue. The reduction of external nutrient load is crucial but might not bring fast relief to eutrophic waters due to ongoing diffuse pollution and legacy nutrients in the sediment. In this context, in-lake measures are needed to speed-up recovery. In this review, we discuss different in-lake measures based on coagulation and precipitation of cyanobacteria and/or phosphate for different lake categories (e.g., shallow or deep, mainly external or internal nutrient load, occurrence of perennial or summer blooms). In deep lakes with an external nutrient load higher than the internal load, a "Floc and Sink" method could be used in which a coagulant (e.g. aluminium salts, Al-salts; chitosan) combined with a ballast (e.g. soil, clay) removes a cyanobacterial bloom out of the water column. In case the deep lake suffers from high internal load, a phosphate (P)-fixative (e.g. lanthanum modified bentonite or Al-salts) can be used to "Lock" the legacy P, possibly combined with a coagulanta "Floc and Lock" technique. The latter approach will target both the particulate P in a bloom and the internal P load. A shallow lake that suffers from summer blooms and in which the internal load is higher than the external load, a "Lock" strategy of winter application of a P-fixative is proposed to prevent bloom development. In shallow lakes with perennial blooms, an agent to damage the cells (such as H 2 O 2 ) is required together with a coagulant and a ballast to avoid recolonization of the water column due to resuspension -a "Kill, Floc and Sink/ Lock" method. The selection of the most promising in-lake measures and materials should be based on a proper system diagnosis and tests prior to a full-scale intervention. These methods can be effective, but evidently reduction of external nutrient loads, both from point-and non-pointed sources, is an absolute necessity to restore aquatic ecosystems in a holistic sense. recyclable sediment phosphorus (P) pool (Moss, 2010). The most notorious symptom of eutrophication is a massive proliferation of cyanobacteria (Paerl et al., 2011). Blooms of cyanobacteria are viewed problematic as they may produce nasty odours, cause fish kills due to hypoxia/anoxia, and may impair ecosystem services, such as drinking water production, irrigation, recreation, aquaculture and fisheries (Paerl and Paul, 2012). Eutrophication is expected to further increase in the upcoming decades because of human population growth, intensified

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“…There are reports of this phenomenon in the literature from doses ≥8 mg Al −1 [21,23], almost three times more than the 3 mg Al L −1 dose chosen as the optimal dose in this study. The Φ PSII was not affected up to 1 mg of AL L −1 and decrease sharply from this concentration, being at odds with other studies where the decrease was recorded from 8 mg Al L −1 [41,50,51]. Miranda et al [21] observed a reduction not only in the Φ PSII but also in the pH in water dominated by Microcystis when using higher doses of PAC (16 and 32 mg Al L −1 ) in the PAC range test.…”

Section: Coagulant Rangementioning

confidence: 82%

‘Floc and Sink’ Technique Removes Cyanobacteria and Microcystins from Tropical Reservoir Water

Arruda

Noyma

Magalhães

et al. 2021

Toxins

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Combining coagulants with ballast (natural soil or modified clay) to remove cyanobacteria from the water column is a promising tool to mitigate nuisance blooms. Nevertheless, the possible effects of this technique on different toxin-producing cyanobacteria species have not been thoroughly investigated. This laboratory study evaluated the potential effects of the “Floc and Sink” technique on releasing microcystins (MC) from the precipitated biomass. A combined treatment of polyaluminium chloride (PAC) with lanthanum modified bentonite (LMB) and/or local red soil (LRS) was applied to the bloom material (mainly Dolichospermum circinalis and Microcystis aeruginosa) of a tropical reservoir. Intra and extracellular MC and biomass removal were evaluated. PAC alone was not efficient to remove the biomass, while PAC + LMB + LRS was the most efficient and removed 4.3–7.5 times more biomass than other treatments. Intracellular MC concentrations ranged between 12 and 2.180 µg L−1 independent from the biomass. PAC treatment increased extracellular MC concentrations from 3.5 to 6 times. However, when combined with ballast, extracellular MC was up to 4.2 times lower in the top of the test tubes. Nevertheless, PAC + LRS and PAC + LMB + LRS treatments showed extracellular MC concentration eight times higher than controls in the bottom. Our results showed that Floc and Sink appears to be more promising in removing cyanobacteria and extracellular MC from the water column than a sole coagulant (PAC).

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Assessment of possible solid-phase phosphate sorbents to mitigate eutrophication: Influence of pH and anoxia

Cited by 45 publications

References 53 publications

Phosphate Adsorption by Montmorillonites Modified with Lanthanum/Iron and a Laboratory Test using Water from the Jacarepaguá Lagoon (RJ, Brazil)

Phosphate Adsorption by Montmorillonites Modified with Lanthanum/Iron and a Laboratory Test using Water from the Jacarepaguá Lagoon (RJ, Brazil)

Coagulation and precipitation of cyanobacterial blooms

‘Floc and Sink’ Technique Removes Cyanobacteria and Microcystins from Tropical Reservoir Water

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