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Title: Mobile phosphorus stratification in sediments by aluminum immobilization
Authors: Lin, J
Sun, Q
Ding, SM
Wang, D
Wang, Y
Chen, MS
Shi, L
Fan, XF
Tsang, DCW 
Keywords: Phosphorus
Aluminum sulfate
Sediment Immobilization High resolution
Issue Date: 2017
Publisher: Pergamon Press
Source: Chemosphere, 2017, v. 186, p. 644-651 How to cite?
Journal: Chemosphere 
Abstract: There is a great heterogeneity in the distribution of mobile phosphorus (P) in natural sediments, while the assessment of P immobilization by amendment agents has mostly neglected this feature. In this study, the effects of aluminum sulfate (ALS) on P immobilization were investigated via a 60-day microcosm experiment using sampled sediment cores. The high-resolution dialysis (HR-Peeper) and diffusive gradients in thin films (DGT) techniques were first employed to establish the profiles of soluble reactive P (SRP) and DGT-labile P in aluminum-amended sediments at 2 and 1 mm resolutions, respectively. Both concentrations of two mobile P forms decreased with increasing ALS dosages. The static layers with extremely low P concentrations (<= 0.060 mg L-1 for SRP and <= 0.024 mg L-1 for DGT-labile P) were observed in the upper 6-16 mm sediment layers at 6-15 ALS/P-mobile treatments (mobile P is the sum of NH4Cl-P, BD-P, and NaOH-nrP; mol mol(-1)). The static layer was followed by an active layer in which the upward release potential (R-AL decreased from 33.4 to 21.9 for SRP and from 92.2 to 51.0 for DGT-labile P, respectively. As the formation of the static layer is a key to sustaining P immobilization in sediments, the minimal dosage of 9 ALS/P-mobile is required for ALS capping. Modeling with DGT Induced Fluxes in Sediments (DIFS) showed a greater increase in adsorption rate constant (k(1), maximum 7.2-fold) compared to adsorption rate constant (k(1), maximum 2.2-fold), demonstrating that the release of P from sediment solids became increasingly difficult after ALS amendment.
Description: 2nd International Conference on Biological Waste as Resource (BWR) - Environmental Impact and Emerging Concerns of Biological Waste Treatment and Recycling Processes, Hong Kong Polytechn Univ, Hung Hom, People's Republic of China, May 25-28, 2017
ISSN: 0045-6535
EISSN: 1879-1298
DOI: 10.1016/j.chemosphere.2017.08.005
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