Nine years of phosphorus management with lanthanum modified bentonite (Phoslock) in a eutrophic, shallow swimming lake in Germany

Epe, Tim S.; Finsterle, Karin; Yasseri, Said

doi:10.1080/10402381.2016.1263693

Cited by 41 publications

(24 citation statements)

References 13 publications

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“…This result contrasts with some studies that showed a rapid decline in phytoplankton abundance, yet they combined a coagulant with LMB as ballast, effectively clearing the water column [20,65]. Other studies used only LMB and also reported a decline or control of cyanobacteria [61], or a short-lived positive effect [19], but no information on the speed of the response, while in another study a clear lag period of several months was observed [66]. In our study, the increase in cyanobacteria in controls and sole LMB treatments after one month does not seem to be caused by recruitment of settled cyanobacteria as a similar phenomenon should have then occurred in the dredged enclosures.…”

Section: Discussioncontrasting

confidence: 64%

“…Therefore, primary production is a more probable explanation for the observed increase in pH in these treatments. This is unexpected as sufficient reduction of SRP by LMB can strongly hamper algal growth, as evidenced in laboratory experiments [15] and whole-lake applications [19,61], yet there are also reports that algal growth was not inhibited after LMB application [62]. Both an insufficient reduction in SRP and potential luxury consumption of P by the cyanobacteria are possible explanations for continued primary production.…”

Section: Discussionmentioning

confidence: 98%

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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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Section: Discussioncontrasting

confidence: 64%

Section: Discussionmentioning

confidence: 98%

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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“…In a similar study, a follow-up research was conducted of phosphorus management with LMB in an eutrophic, shallow swimming lake in Germany, showing the phenomenon of excess phosphorous concentrations as a result of human-generated nutrients [24]. The role of external phosphorous inputs from water-flow-and possibly other external sources-was also discussed upon the water treatment of two lakes in North America.…”

Section: Introductionmentioning

confidence: 99%

“…In summarizing the approached of environmental remediation through management of aquatic eutrophication and aquatic ecosystems they are noteworthy: the in situ sediment remediation using the modified clays of LMB and modified zeolite, to control fluvial nitrogen and phosphorus sedimental loading and intermittent aeration [21], the application of LMB to control the high transparency and the low levels of soluble phosphorus at lakes from polluted inflows to lakes by domestic and agriculture mixed wastewater [23], where LMB-applied sinks to the lake bottom intercepts the upward flux of internal load from sediment P release [25]. Such P management can: increase the suspension of P mass [26,30]; decrease the intensity of mineralization processes, prevent large algal and cyanobacterial blooms, enhance the swimming and the recreation uses for lakes [24]; decrease the levels of water column total P, causing a shift form mobile sediment P to residual fractions [22]; control eutrophication while mitigating cyanobacterial nuisance [31]; advance novel technologies to inactivate phosphorus and achieve improved water quality by developing dense submerged macrophytes beds [29].…”

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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“…The elimination/decrease of cyanobacterial blooms, changes in species composition, and decreases of phytoplankton abundance that were observed in Swarzędzkie were related to the use of biomanipulation (fish removal and fish stocking) [19]. Phytoplankton decrease has also been recorded in other lakes under restoration, e.g., Durowskie [33], Ringsjön [35], Bärensee [36], and hypereutrophic ponds [37]. Fluctuations of phytoplankton abundance and biomass observed in Swarzędzkie as well as in Durowskie [33], Rusałka [38], Lake Głęboczek [39], or Maltański Reservoir [10] are a significant feature of the phytoplankton reaction to restoration.…”

Section: Discussionmentioning

confidence: 92%

Changes in Phytoplankton Structure due to Prematurely Limited Restoration Treatments

Kozák¹,

Rosińska²,

Gołdyn³

2018

Pol. J. Environ. Stud.

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Phytoplankton plays an important role in the structure and functioning of an aquatic ecosystem, thus affecting other groups of organisms [1]. The growth of phytoplankton depends mainly on the availability of nitrogen and phosphorus [2-4]. Excessive eutrophication caused by high nutrient concentrations (especially phosphorus and nitrogen) along with strong cyanobacterial blooms results in decreasing aquatic ecosystem biodiversity [5]. Water

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Nine years of phosphorus management with lanthanum modified bentonite (Phoslock) in a eutrophic, shallow swimming lake in Germany

Cited by 41 publications

References 13 publications

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

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

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

Changes in Phytoplankton Structure due to Prematurely Limited Restoration Treatments

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