Untitled

Hullebusch, Eric van

doi:10.1023/a:1023914805034

Cited by 34 publications

(4 citation statements)

References 37 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The Al treatment increased the Al NaOH ∼ 25 pool, and consequently, changed the sorption characteristics of Jordán sediments from those of a nonacidified lake such as Římov Reservoir (Figure A) to those typical of an acidified lake such as Plešné Lake (Figure B) and significantly reduced the amount of P extractable under anoxic conditions. Similar results were obtained in other laboratory experiments ( , ) and during lake restoration treatments with Al ( , ).…”

Section: Resultssupporting

confidence: 91%

Aluminum Control of Phosphorus Sorption by Lake Sediments

Kopáček

Borovec

Hejzlar

et al. 2005

Environ. Sci. Technol.

179

View full text Add to dashboard Cite

Release of reactive (phosphate-like) phosphorus (P) from freshwater sediments represents a significant internal P source for many lakes. Hypolimnetic P release occurs under reducing conditions that cause reductive dissolution of ferric hydroxide [Fe(OH)3]. This hypolimnetic P release may be naturally low or artificially reduced by sediment with naturally high or artificially elevated concentrations of aluminum hydroxide [Al(OH)3]. We presentfield and laboratory data for a common extraction analysis of sediments from 43 lakes differing in trophic status, pH regime, climate, and P loading. The results indicate that a simple sequential extraction of sediment may be a useful predictor of sediment's ability to release P. Sequential extractions of sediment P, Al, and Fe by water (H2O), bicarbonate-dithionite (BD), and NaOH (at 25 degrees C) showed that negligible amounts of P would be released from lake sediments during hypolimnetic anoxia if either (1) the molar Al(NaOH-25):Fe(BD) ratio is > 3 or (2) the molar Al(NaOH-25):P(H2O+BD) ratio is > 25. These ratios can be used as operational targets for estimation of sediment P release potential and Al dosing of P-rich sediment to prevent hypolimnetic P release under anoxic conditions.

show abstract

Section: Resultssupporting

confidence: 91%

Aluminum Control of Phosphorus Sorption by Lake Sediments

Kopáček

Borovec

Hejzlar

et al. 2005

Environ. Sci. Technol.

179

View full text Add to dashboard Cite

show abstract

“…Under alkaline conditions, the adsorption of phosphorus by LMB was hindered (Figure ). At the same time, phosphorus bound to metal oxides such as iron and aluminum oxides can be released from the sediment into water under alkaline conditions. , In addition, a significant negative effect of dissolved organic carbon (DOC) on the sequestration of phosphorus by LMB also has been previously reported. ,, Therefore, one would expect a much higher DIP concentration under light conditions in view of the pH and DOC concentration. Nevertheless, our results show that the DIP concentration was much lower under light conditions for sediment when compared to that observed under dark conditions (Table ).…”

Section: Discussionmentioning

confidence: 99%

“…However, in addition to the damage to the evenly distributed capping layer, the disturbance can also cause the sediment and LMB to be resuspended into the photic layer of the overlying water, where enough light is present for photosynthesis to take place so that sunlight and carbon dioxide gas are converted into organic carbon (in phytoplankton) and oxygen gas. Due to the photosynthesis activity of algae, the environment in the photic layer differs from the lake bed; that is, the former has a generally high pH (it can exceed pH 10 during major phytoplankton blooms in poorly buffered systems), ,, high dissolved organic carbon (DOC), high dissolved oxygen (DO), and algae present. Although phosphorus-inactivating agents (PIAs), including LMB, are increasingly being applied and extensively investigated to control internal phosphorus loading in lakes, little is known about how PIA-amended sediment behaves in terms of phosphorus immobilization and release when it is resuspended into the photic layer.…”

Section: Introductionmentioning

confidence: 99%

Immobilization and Release Behavior of Phosphorus on Phoslock-Inactivated Sediment under Conditions Simulating the Photic Zone in Eutrophic Shallow Lakes

Zhang

Xie

et al. 2019

Environ. Sci. Technol.

View full text Add to dashboard Cite

Phosphorus-inactivating agents (PIAs) have increasingly been applied and extensively investigated to control internal phosphorus loading in lakes. However, little is known about the behavior of PIA-amended sediment in terms of phosphorus immobilization and release when the sediment is resuspended in the photic layer, whose environment differs from the lake bed. Lanthanum-modified bentonite (LMB) is a popular PIA product. In this study, the 33 day core incubation experiment under dark conditions showed that capping sediment with LMB efficiently decreased the concentration of total phosphorus, total dissolved phosphorus, and dissolved inorganic phosphorus (DIP) by 90, 87, and 99%, respectively. Resuspension into overlying water under light conditions at high pH, high dissolved organic carbon, and in the presence of algae significantly impedes the performance of LMB. However, the adoption of a higher LMB dose improved the performance, including a reduction in the phosphorus level and control of algal growth. The dynamics of the phosphorus migration when the LMB-inactivated sediment was resuspended into the photic zone mainly involves the release of DIP from the sediment and the uptake of DIP by algae and LMB. In conclusion, a higher dose is needed in the PIA (particularly Phoslock) application in shallow productive lakes where sediment resuspension occurs frequently.

show abstract

“…Influxes of phosphorus compounds originating in bottom sediments may in fact account for up to 99% of the content of P in shallow reservoirs. This means that the intensity and duration of the internal process of alimentation with phosphorus is significant for water quality [18,46]. In the case of the Reservoir studied, the most intensive alimentation of this kind is likely to occur near the inflow (at station M1).…”

Section: Discussionmentioning

confidence: 99%

The Connection between a Suspended Sediments and Reservoir Siltation: Empirical Analysis in the Maziarnia Reservoir, Poland

2020

View full text Add to dashboard Cite

This paper presents research on the influence of suspended sediments on selected aspects of a reservoir’s functioning. As the amount of sediment suspended in water (SS) there was found to correlate significantly with sedimentation rate (Us), it was possible to develop a function allowing the rate of accumulation of sediments to be predicted by reference to known amounts of suspended sediment. The latter factor was also shown to correlate significantly with the content of organic matter in suspension (OMSS), in sediment captured in a sediment trap (OMS), and of bottom sediment (OMSB). Analysis of amounts of suspended sediment can provide for estimates of total loads of organic pollutants deposited in the sediments of a reservoir. A further significant correlation with SS was noted for the concentration of total phosphorus in water (TPW), confirming the importance of internal production where the circulation of this biogenic substance in a reservoir ecosystem is concerned. Analysis of stable carbon isotopes in turn showed that entrapped sediments were depleted of—or enriched in—13C, in line with whether concentrations of total P in those sediments (TPS) were at their highest or lowest levels. This dependent relationship may thus be of key importance in assessing sources of phosphorus, as well as in forecasting concentrations present in reservoir sediments. The results obtained make it clear that sediments suspended in the water of a reservoir unify phenomena and processes ongoing there, between elements of the water-sediment system.

show abstract

Untitled

Cited by 34 publications

References 37 publications

Aluminum Control of Phosphorus Sorption by Lake Sediments

Aluminum Control of Phosphorus Sorption by Lake Sediments

Immobilization and Release Behavior of Phosphorus on Phoslock-Inactivated Sediment under Conditions Simulating the Photic Zone in Eutrophic Shallow Lakes

The Connection between a Suspended Sediments and Reservoir Siltation: Empirical Analysis in the Maziarnia Reservoir, Poland

Contact Info

Product

Resources

About