A theoretical and experimental study on the P-adsorption capacity of Phoslock™

Zamparas, Miltiadis; Gavriil, Gavriil; Coutelieris, Frank A.; Zacharias, Ierotheos

doi:10.1016/j.apsusc.2015.02.042

Cited by 34 publications

(11 citation statements)

References 18 publications

(25 reference statements)

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“…Therefore, the application process of P-inactivation agents in a natural and dynamic ecosystem requires careful consideration (Figure 9a). The necessary quantities of material utilized in the form of slurry should be accurately calculated, being based on the potentially bioavailable mobile P of the sediment in the water column ( Figure 9b) [45,[49][50][51] present in the water column and its external flows can be adsorbed by the proposed method of "tea-bag" (Figure 9c,d).…”

Section: Challenging Issues Of Novel Composite Materials In the Direcmentioning

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: Challenging Issues Of Novel Composite Materials In the Direcmentioning

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 LMB pH is close to neutral (7.0-7.5) but can be successfully used in a wide pH range from 5 to 9 [22][23][24]. Several studies have been developed to prove nontoxic character of the lanthanum-modified bentonite clay and, in conclusion, to classify LMB as not hazardous [25][26][27].…”

Section: Methodsmentioning

confidence: 99%

Treatment Wetland effluent quality improvement by usage sorbents of various origin

Kasprzyk

2019

E3S Web Conf.

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TWs are finding as low-cost and also effective system to treat domestic wastewater. The aim of this study is to find suitable adsorbing material for application in an additional treatment unit where treatment wetlands do not provide sufficient PO43- reduction level. Material M1 is a fine-grained by-product of thermal treatment of carbonate-siliceous rock (opoka) with high content of calcium carbonate CaCO3 in temperature 700°C. Particular disadvantage of material M1 can be very high level of pH (11-12) and causing alkaline solution. Material M2 is lanthanum-modified bentonite (LMB) and was already used for reducing content of phosphorus compounds in lakes and other water bodies to treat effects of eutrophication process. Lanthanum-modified bentonite consists mostly SiO2 and Al2O3 (~80%). The study was conducted on effluent from small (60 pe) treatment wetland (TW) in northern Poland where Hybrid Treatment Wetland (HTW) system was provided. Sorption capacity of material M1 was low and equal 0.9 mg/g. For material M2 this parameter reached value of 2.1 mg/g. Lanthanum-modified bentonite (M2) has shown better abilities to reduce phosphates from wastewater that material M1 – material containing mostly calcium oxide. Also performed study revealed that presence of others contaminations in wastewater is causing difficulties in phosphates removal.

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“…Phoslock is produced through a patented ion exchange process whereby lanthanum ions displace sodium ions within the clay matrix. The formulation process of Phoslock absorbs lanthanum into a non-toxic carrier such that the lanthanum retains its capacity to bind phosphate when applied to aquatic environments and results in a non-toxic mineral that becomes an inert component of the sediments [56]. For over ten years, Phoslock has been successfully used in water resource restoration programs around the world to remove free reactive phosphorus and restore water quality.…”

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A mathematical model to restore water quality in urban lakes using Phoslock

Tiwari¹,

Singh²,

Khajanchi³

et al. 2021

DCDS-B

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Urban lakes are the life lines for the population residing in the city. Excessive amounts of phosphate entering water courses through household discharges is one of the main causes of deterioration of water quality in these lakes because of the way it drives algal productivity and undesirable changes in the balance of aquatic life. The ability to remove biologically available phosphorus in a lake is therefore a major step towards improving water quality. By removing phosphate from the water column using Phoslock essentially deprives algae and its proliferation. In view of this, we develop a mathematical model to investigate whether the application of Phoslock would significantly reduce the bio-availability of phosphate in the water column. We consider phosphorus, algae, detritus and Phoslock as dynamical variables. In the modeling process, the introduction rate of Phoslock is assumed to be proportional to the concentration of phosphorus in the lake. Further, we consider a discrete time delay which accounts for the time lag involved in the application of Phoslock. Moreover, we investigate behavior of the system by assuming the application rate 2020 Mathematics Subject Classification. 91B76,

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A theoretical and experimental study on the P-adsorption capacity of Phoslock™

Cited by 34 publications

References 18 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

Treatment Wetland effluent quality improvement by usage sorbents of various origin

A mathematical model to restore water quality in urban lakes using Phoslock

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