Assessment of Phoslock®  application in a tropical eutrophic reservoir: An integrated evaluation from laboratory to field experiments

Yamada-Ferraz, T.M.; Sueitt, Ana Paula Erbetta; Oliveira, Aline Fernandes de; Botta, Clarice Maria Rispoli; Fadini, Pedro S.; Nascimento, Marcos Roberto Lopes do; Faria, Bias Marçal de; Mozeto, Antônio A.

doi:10.1016/j.eti.2015.07.002

Cited by 25 publications

(8 citation statements)

References 31 publications

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“…Besides cases where PO 4 -P and total phosphorus (TP) are not statistically different among water samples treated, the positive potential role of the modified clay remains unclear and questionable in practice [31]. Another result of LMB concentration increase is the conductivity increase and turbidity decrease, due to rapid settlement [29,32].…”

Section: Introductionmentioning

confidence: 99%

Novel Composite Materials for Lake Restoration: A New Approach Impacting on Ecology and Circular Economy

et al. 2020

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The purpose of this study is to promote a new way of application composite materials to restore eutrophic waters. A new sustainable way of application is based on the “teabag” method, in which materials were placed in water-permeable bags and immersed in the water column in order to sorb phosphate—one of the main contributory element for the eutrophication problem. Particularly, the two composites materials of Phoslock™ (lanthanum-modified bentonite, LMB) and Bephos™ (Fe-modified bentonite, f-MB) were tested and bench-scale batch experiments were employed to investigate their sorption efficiency in the forms of slurry and teabag. The adsorption kinetics and the relevant adsorption isotherms were deployed, while the effect of the materials on turbidity and their aging were also investigated. Experimental results showed that Phoslock™ and Bephos™ (as teabag), being applied at initial concentration range: 0.05–5 mg/L, they sustained a maximum adsorption capacity of 7.80 mg/g and 25.1 mg/g, respectively, which are considered sufficient rates for P concentrations reported at natural aquatic ecosystems. At the same time this new method did not cause turbidity in the water column, since the material was not released into the water, thus, preventing potential harmful consequences for the living organisms. Moreover, the “teabag” method prevents the material to cover the lake bottom, avoiding the phenomenon of smothering of benthos. Βy teabag method, the materials can be collected for further applicability as soil improver or crops fertilizer. Finally, it was argued that the possibility to recycle LMB and f-MB materials for agricultural use is of paramount importance, sustaining also positive impacts on sustainable ecology and on the routes of circular economy (CE).

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Section: Introductionmentioning

confidence: 99%

Novel Composite Materials for Lake Restoration: A New Approach Impacting on Ecology and Circular Economy

et al. 2020

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“…Previous field and mesocosm trials have shown that reversing the impact of anthropogenic inputs in the environment is challenging, and that minimising the level of these inputs and waste management will help curb environmental contamination [3]. Ecologists have tested different methods to try and reduce contamination in freshwater systems, and these include adsorption, soil washing, reverse osmosis, coagulation, and flocculation [4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Heavy Metals Assimilation by Native and Non-Native Aquatic Macrophyte Species: A Case Study of a River in the Eastern Cape Province of South Africa

Tshithukhe

Motitsoe

Hill

2021

Plants

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There is continuous deterioration of freshwater systems globally due to excessive anthropogenic inputs, which severely affect important socio-economic and ecological services. We investigated the water and sediment quality at 10 sites along the severely modified Swartkops River system in the Eastern Cape Province of South Africa and then quantified the phytoremediation potential by native and non-native macrophyte species over a period of 6 months. We hypothesized that the presence of semi and permanent native and non-native macrophytes mats would reduce water and sediment contamination through assimilation downriver. Our results were variable and, thus, inconsistent with our hypotheses; there were no clear trends in water and sediment quality improvement along the Swartkops River. Although variable, the free-floating non-native macrophyte, Pontederia (=Eichhornia) crassipes recorded the highest assimilation potential of heavy metals in water (e.g., Fe and Cu) and sediments (e.g., Fe and Zn), followed by a submerged native macrophyte, Stuckenia pectinatus, and three native emergent species, Typha capensis, Cyperus sexangularis, and Phragmites australis. Pollution indices clearly showed the promising assimilation by native and non-native macrophytes species; however, the Swartkops River was heavily influenced by multiple non-point sources along the system, compromising the assimilation effect. Furthermore, we emphasise that excessive anthropogenic inputs compromise the system’s ability to assimilate heavy metals inputs leading to water quality deterioration.

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“…: fish and macrophyte) (Zhao et al, 2012;Liu et al, 2018;Chen et al, 2020), adsorbents (e.g. : Phoslock  and lanthanum modified bentonite application) (Yamada-Ferraz et al, 2015;van Oosterhout et al, 2020) and sediment capping (Cooke et al, 2005). However, according to these references, some disadvantages are involved in these methods, such as risks for aquatic biota and possible resuspension of P and metals from sediment.…”

Section: Introductionmentioning

confidence: 99%

Phosphorus and metals immobilization by periphyton in a shallow eutrophic reservoir

et al. 2021

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Aim: This study evaluated and compared the changes in the Total Phosphorus (TP) and metals (Cd, Cu, Ni and Pb) contents and accumulation rates in the periphyton on different substrate types (PET and glass) in wet and dry periods in a shallow eutrophic reservoir. Thus, the potential of periphyton as a green biotechnology to remediate the eutrophication and promoting metal uptake were investigated. Methods: Floating substrate carriers made of wood (n = 3) containing glass and PET slides were submerged close to a sewage inflow site. Substrate exposure time was about 33 days in each period. Results: Periphyton TP and metal contents (Cu, Ni and Pb) were influenced by seasonality and the highest contents were found in the wet period. Periphyton metal contents were significantly different between glass or PET substrates, but no differences were detected in the TP contents. Conclusions: Seasonality was a determining factor for immobilization of TP and metals in periphyton. The highest potential of TP and metals immobilization by periphyton were detected in the wet period. Our results provided insights that the periphyton can contribute to remediate eutrophication and metal removal in aquatic ecosystems.

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Assessment of Phoslock® application in a tropical eutrophic reservoir: An integrated evaluation from laboratory to field experiments

Cited by 25 publications

References 31 publications

Novel Composite Materials for Lake Restoration: A New Approach Impacting on Ecology and Circular Economy

Novel Composite Materials for Lake Restoration: A New Approach Impacting on Ecology and Circular Economy

Heavy Metals Assimilation by Native and Non-Native Aquatic Macrophyte Species: A Case Study of a River in the Eastern Cape Province of South Africa

Phosphorus and metals immobilization by periphyton in a shallow eutrophic reservoir

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