The application of sediment capping agents on phosphorus speciation and mobility in a sub-tropical dunal lake

2004 ◽  
Vol 55 (7) ◽  
pp. 715 ◽  
Author(s):  
Darren Akhurst ◽  
Graham B. Jones ◽  
David M. McConchie
Keyword(s):  
Sediment Cores ◽  
Waste Product ◽  
Bentonite Clay ◽  
Speciation Analysis ◽  
Available P ◽  
Phosphorus Speciation ◽  
Overlying Water ◽  
Capping Agents ◽  
Sediment Capping ◽  
Plant Available P

Experimental sediment cores from Lake Ainsworth, Australia, were exposed to an induced 46-day, anoxic/oxic cycle in the laboratory, mimicking the seasonal thermal stratification cycle commonly observed in the lake’s waters every summer. Under oxic conditions the supply of phosphorus (P) and iron (Fe) to the overlying water was slow, however, induced anoxia led to an enhanced release of P and Fe from the sediments to the water column. An inverse relationship between total P, Fe and redox potential suggests that Lake Ainsworth sediments are redox sensitive. Phosphorus speciation analysis of Lake Ainsworth sediments revealed the presence of a large pool of organic P, reactive Fe-bound P, and CaCO3-bound P, the latter fraction decreasing during anoxic conditions. Two sediment-capping agents, a lanthanum modified bentonite clay and Bauxsol (a waste product from the aluminium smelting industry) were assessed for their ability to reduce the levels of P released from Lake Ainsworth sediments during the 46-day, anoxic/oxic cycle. The bentonite clay was highly effective at reducing plant available P in anoxic/oxic conditions, but levels of dissolved Fe were enhanced with its use. Although the use of Bauxsol to remove plant available P is not recommended in anoxic waters, its use in suspension in oxic waters warrants further study.

scholarly journals Plant-available P supply is not the main factor determining the benefit from arbuscular mycorrhiza to crop P nutrition and growth in contrasting cropping systems

2011 ◽  
Vol 350 (1-2) ◽  
pp. 85-98 ◽  
Author(s):  
Helena Kahiluoto ◽  
Elise Ketoja ◽  
Mauritz Vestberg
Keyword(s):  
Arbuscular Mycorrhiza ◽  
Cropping Systems ◽  
Available P ◽  
P Nutrition ◽  
Plant Available P ◽  
P Supply ◽  
Main Factor

scholarly journals Behaviour of Metal(loid)s at the Sediment-Water Interface in an Aquaculture Lagoon Environment (Grado Lagoon, Northern Adriatic Sea, Italy)

2021 ◽  
Vol 11 (5) ◽  
pp. 2350
Author(s):  
Elisa Petranich ◽  
Matteo Crosera ◽  
Elena Pavoni ◽  
Jadran Faganeli ◽  
Stefano Covelli
Keyword(s):  
Sediment Cores ◽  
Fish Farm ◽  
Trophic Chain ◽  
Water Interface ◽  
Northern Adriatic Sea ◽  
Overlying Water ◽  
Northern Adriatic ◽  
In Situ Experiments ◽  
Diffusive Fluxes ◽  
Lagoon Environment

The cycling of metal(loid)s at the sediment–water interface (SWI) was evaluated at two selected sites (VN1 and VN3) in an active fish farm in the Grado Lagoon (Northern Adriatic, Italy). In situ experiments using a transparent benthic chamber and the collection of short sediment cores were performed, to investigate the behavior of metal(loid)s in the solid (sediments) and dissolved (porewaters) phases. Total and labile concentration of metal(loid)s were also determined in sediments, to quantify their potential mobility. Comparable total concentrations were found at both sites, excluding As, Mn, Pb and V, which were higher at VN3. Metal(loid) porewater profiles showed a diagenetic sequence and a close dependence with redox (suboxic/anoxic) conditions in the surface sediments. Positive diffusive fluxes along with benthic fluxes, particularly at the more oxic site, VN1, were found for almost all metal(loid)s, indicating their tendency to migrate towards the overlying water column. Despite sediments at two sites exhibiting high total metal(loid) concentrations and moderate effluxes at the SWI, the results suggest that they are hardly remobilized from the sediments. Recycling of metal(loid)s from the SWI would not constitute a threat for the aquatic trophic chain in the fish farm.

Influence of the Initial Nitrogen Concentration on Eliminating Nitrogen Load of Europhia Sediment Capping with Active Barrier System (ABS)

2011 ◽  
Vol 374-377 ◽  
pp. 498-503
Author(s):  
Jin Lan Xu ◽  
Lei Wang ◽  
Jun Chen Kang ◽  
Ting Lin Huang ◽  
Yu Hua Dong
Keyword(s):  
Total Nitrogen ◽  
Nitrate Nitrogen ◽  
Nitrogen Concentration ◽  
Ammonia Nitrogen ◽  
Overlying Water ◽  
Sediment Capping ◽  
Time Treatment ◽  
Total Nitrogen Concentration ◽  
Long Time ◽  
Active Barrier

Abstract: Active barrier system (ABS) capping zeolite with large surface area and strong adsorption ability is an effective way to control eutrophication of lake since it can remove ammonia in the lake released by sediment. Influence of the initial nitrogen concentration on eliminating nitrogen load of europhia sediment capping with active barrier system (ABS) were studied through an investigation of the repairment results of serious pollution period (total nitrogen concentration up to 25.33 mg/L), moderate pollution period (14.39 mg/L) and the slight pollution period (3.47 mg/L) of the ancient Canal of Yangzhou. The results showed that: (1) zeolite F1 inhibition effect is stronger than zeolite F2. More TN were removed as the initial TN concentration increased and longer rapid inhibit period were presented with the increased initial TN concentration. (2) The ammonia nitrogen in sediment could be rapidly released into the overlying water, and with lower initial TN concentration in source water, more ammonia would be released from the sediment. Long time treatment was necessary to inhibit the release of ammonia completely if the water showed a high initial TN concentration. (3) After covering zeolite, the total nitrogen in the overlying water were removed mainly through nitrification and denitrification. At the initial TN concentration of 3.47 mg/L, 14.39 mg/L, 25.88 mg/L, 61%, 45% and 52% of TN were removed by the conversion of ammonia to nitrogen gas, however, others left in water as nitrate nitrogen and nitrite residues, and 90% was nitrate nitrogen.

Benthic exchange of sedimentary metals (Cd, Cu, Fe, Mn, Ni and Zn) in the Deûle River (Northern France)

2012 ◽  
Vol 9 (5) ◽  
pp. 485 ◽  
Author(s):  
Beatriz Lourino-Cabana ◽  
Ludovic Lesven ◽  
Gabriel Billon ◽  
Lionel Denis ◽  
Baghdad Ouddane ◽  
...  
Keyword(s):  
Trace Metal ◽  
Sediment Cores ◽  
Metal Exchange ◽  
Negative Effects ◽  
Overlying Water ◽  
Colloidal Iron ◽  
Northern France ◽  
Anoxic Events ◽  
Co Precipitation ◽  
Sediment Interface

Environmental context Exchange processes at the water–sediment interface can release metals to riverine waters, having negative effects on organisms in the water column. We investigate the geochemical processes and metal exchange between the surface sediment and the overlying water under metal contamination conditions. Results suggest that the sediment can be a significant source of metal pollution in aquatic systems, particularly during anoxic events. Abstract Experiments were performed on the Deûle River (Northern France), which is strongly polluted by smelting plants, in the aim to investigate the influence of diagenetic processes and benthic macro-faunal activity on trace metal (Cd, Cu, Ni and Zn) and major metal (Fe, Mn) exchanges occurring at the water–sediment interface. Diffusive metal fluxes were determined from pore water metal concentration gradients measured in sediment cores. Benthic metal fluxes were evaluated using incubation chambers under dark conditions, and by further examining key variables (O2, CO2, redox potential and pH) affecting metal release and sequestration processes. As a whole, it was demonstrated that benthic fluxes were strongly dependent upon medium oxygenation and generation of colloidal iron oxides and hydroxides at the overlying water–sediment interface, raising the possibility of trace-metal adsorption and (co)precipitation.

scholarly journals Phosphorus availability in hydromorphic soils of Eastern Croatia

2011 ◽  
Vol 49 (No. 9) ◽  
pp. 394-401 ◽  
Author(s):  
D. Petosić ◽  
V. Kovacević ◽  
M. Josipović
Keyword(s):  
Surface Layer ◽  
High Frequency ◽  
Agricultural Land ◽  
Phosphorus Availability ◽  
Available P ◽  
Soil Profiles ◽  
P Availability ◽  
Hydromorphic Soils ◽  
Ammonium Lactate ◽  
Plant Available P

The phosphorus (P) availability was tested on hydromorphic soils located in theSavavalley. 480 soil profiles covering the area of31 227 hawas analysed in our study. The plant available P was determined by the Ammonium-Lactate method. The P availability in the surface layer (0–30 cm) is very low (up to 5 mg P2O5/100 g of soil) in about 30% of the tested agricultural land (9 440 ha), next 32% (9 897 ha) is in the range of a low P availability (from 5.1 to 10 mg), while only 17% (5 445 ha) has a good or very good P availability (above 20 mg). Especially high frequency of low P availability was found in vertic gley, amphygley and hypogley soils (total8 680 haor 28% of tested agricultural land).

Phosphorus Speciation and Distribution in Sediments and the Relationship with Total Phosphorus in the Overlying Water

2016 ◽  
Vol 13 (4) ◽  
pp. S93-S99
Author(s):  
Xiaohui Lu ◽  
Peifang Wang ◽  
Malik Ali ◽  
Qiao Xiao ◽  
Chen Rui
Keyword(s):  
Total Phosphorus ◽  
Phosphorus Speciation ◽  
Overlying Water ◽  
The Relationship

Plant-available P for Maize and Cowpea in P-deficient Soils from the Nigerian Northern Guinea Savanna – Comparison of E- and L-values

2006 ◽  
Vol 283 (1-2) ◽  
pp. 251-264 ◽  
Author(s):  
Pieter Pypers ◽  
Liesbeth Van Loon ◽  
Jan Diels ◽  
Robert Abaidoo ◽  
Erik Smolders ◽  
...  
Keyword(s):  
Available P ◽  
Northern Guinea Savanna ◽  
Guinea Savanna ◽  
Plant Available P

Influence of Zeolite Dose on Eliminating Nitrogen Load of Europhia Sediment Capping with Active Barrier System (ABS)

2011 ◽  
Vol 374-377 ◽  
pp. 70-75
Author(s):  
Ting Lin Huang ◽  
Jin Lan Xu ◽  
Jun Chen Kang ◽  
Dong Dong Sun
Keyword(s):  
Good Control ◽  
Ammonia Nitrogen ◽  
Nitrite Accumulation ◽  
High Dose ◽  
Overlying Water ◽  
Sediment Capping ◽  
Removal Capacity ◽  
N Release ◽  
Active Barrier ◽  
Principal Pathway

Abstract: This study investigated to eliminate the nitrogen load of sediment from Yangzhou ancient canal capping with an active barrier system (ABS) using two kinds of zeolite with five different coverage densities. For ABS capping with zeolite F1 when the zeolite dose is low (0.21 kg/m2 and 0.62 kg/m2), it is found that ABS failed to achieve good control in preventing N release in the entrophic sediments as total nitrogen (TN) concentrations of overlying water were increased to 3.76 mg/L and 3.13 mg/L, respectively after 16 days. However, when zeolite density was increased to 1.04 kg/m2, TN concentration of overlying water decreased to 1.94 mg/L and TN removal efficiency is up to 50% after 16 days. For ABS capping with zeolite F2 TN concentration of overlying water is reported to descend in both low dose and high dose series. It is found that zeolite F2 is unfit for remediation of sediments from ancient Canal in Yangzhou because the ability in preventing release of ammonia nitrogen from sediments is weak. A possible explanation is that microorganism attaching on surface of two zeoltes differs to cause large difference of removal capacity between zeolite F1 and zeolite F2. It is found that nitrification and denitrification is the principal pathway for the former one while nitrite accumulation appears in the latter. To sum up, the capacity of eliminating TN load by zeolite F1 is stronger than that by zeolite F2, the optimum capping density of zeolite F1 is 1.04 kg/m2.

Fluxes of nutrients and trace metals across the sediment-water interface controlled by sediment-capping agents: bentonite and sand

2016 ◽  
Vol 188 (10) ◽  
Author(s):  
Junho Han ◽  
Hee-Myong Ro ◽  
Kyung Hwa Cho ◽  
Kyoung-Woong Kim
Keyword(s):  
Trace Metals ◽  
Water Interface ◽  
Capping Agents ◽  
Sediment Capping

Simultaneous iron, zinc, sulfur and phosphorus speciation analysis of barley grain tissues using SEC-ICP-MS and IP-ICP-MS

Metallomics ◽  
2009 ◽  
Vol 1 (5) ◽  
pp. 418 ◽  
Author(s):  
Daniel P. Persson ◽  
Thomas H. Hansen ◽  
Kristian H. Laursen ◽  
Jan K. Schjoerring ◽  
Søren Husted
Keyword(s):  
Speciation Analysis ◽  
Barley Grain ◽  
Phosphorus Speciation ◽  
Icp Ms
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