Phosphorus Adsorption‐Desorption Characteristics of Two Soils Utilized for Disposal of Animal Wastes

Freeze–thaw cycles (FTCs) can strongly influence the physical and chemical properties of soils in cold regions, which can in turn affect the adsorption–desorption characteristics of phosphorus (P) in the soil.

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Classification of Dissolved and Particulate Phosphate Components in Xiangxi River, China

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.535.293 ◽

2014 ◽

Vol 535 ◽

pp. 293-297

Author(s):

Wen Jun Yang ◽

Jian Li ◽

Zhong Wu Jin

Keyword(s):

Water Quality ◽

Suspended Sediment ◽

Langmuir Equation ◽

Three Gorges Project ◽

Phosphorus Adsorption ◽

The Three Gorges ◽

Xiangxi River ◽

The Three Gorges Project ◽

Adsorption Desorption

These years the water quality deteriorated in Xiangxi River (XXR)---one tributary of Yangtze River in the Three Gorges Project reservoir area. Many components existed in XXR such as nutrients, suspended sediment (SS) and phytoplankton. The nutrients containing phosphorus could be adsorbed to the fine SS, which influenced the water quality components cycling obviously. For calculating the concentrations of different forms of phosphates (mainly the dissolved phosphate and particulate phosphate) more precisely, the formula was deduced based on the Langmuir equation and modified Langmuir equation. Then the field observed data were used to validate the deduced formula, which showed that the deduced formula can calculate the concentrations well. The formula could be applied for the water quality or ecological modeling, and also provide more information for water quality improvement. Keywords: Suspended sediment; Phosphorus; Adsorption-desorption; Xiangxi River

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Sponge effect of aerated concrete on phosphorus adsorption-desorption from agricultural drainage water in rainfall

Soil and Water Research ◽

10.17221/118/2019-swr ◽

2020 ◽

Vol 15 (No. 4) ◽

pp. 220-227

Author(s):

Jinquan Zhang ◽

Weiguo Fu

Keyword(s):

Drainage Water ◽

Agricultural Drainage ◽

Phosphorus Adsorption ◽

P Adsorption ◽

Initial Stage ◽

Aerated Concrete ◽

Initial Adsorption ◽

Adsorption Desorption ◽

The Relationship ◽

Peak Value

In the initial stage of the rainfall, the nutrient element phosphorus (P) in the farmland, one of the most important factors causing agricultural non-point source pollution, flows into agriculture drainage ditches rapidly, and an instantaneous phosphorus peak value in the ditch water often occurs. Aerated concrete with high P adsorption properties was chosen as the experiment material in the laboratory to reduce the instantaneous P peak value in the drainage water in the initial stage of the rainfall. The three total P (TP) concentrations of the simulated drainage water (1.0, 2.0, and 3.0 mg/L) stood for three treatments were designed in the adsorption experiment; the same three TP concentrations of the simulated drainage water and the three TP concentrations of the simulated natural water (0.2, 0.3, and 0.4 mg/L) stood for nine treatments in the desorption experiment. The sponge effect of the aerated concrete on the P adsorption-desorption was explored by studying the dynamics of the P adsorption-desorption of the aerated concrete with an increase in the experiment’s time. The results showed the following details: (1) Both the adsorption rate and desorption rate of the aerated concrete decrease with an increase in the experiment’s time. The initial adsorption is dominant during the entire adsorption, as with the initial desorption during the entire desorption. (2) The adsorption capacity of the aerated concrete slightly decreases with the increase in the re-adsorption, whereas the desorption capacity of the aerated concrete significantly decreases with the increase in the re-desorption. Thus, the aerated concrete can be introduced into the agricultural drainage ditch to reduce the instantaneous P peak value in the drainage water in the initial stage of the rainfall, and potential further studies should explore the relationship between the different drainage water loads and the amount of the aerated concrete.

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Modification of sediment redox potential by three contrasting macrophytes: implications for phosphorus adsorption/desorption

Marine and Freshwater Research ◽

10.1071/mf02087 ◽

2003 ◽

Vol 54 (1) ◽

pp. 87 ◽

Cited By ~ 35

Author(s):

Kane T. Aldridge ◽

George G. Ganf

Keyword(s):

Redox Potential ◽

Phosphorus Uptake ◽

Potamogeton Crispus ◽

Emergent Macrophytes ◽

Freshwater Macrophytes ◽

Phosphorus Adsorption ◽

Bare Sediment ◽

Organic Debris ◽

Below Ground ◽

Adsorption Desorption

Freshwater macrophytes may increase sediment redox potential and the affinity of sediments for phosphorus through radial oxygen loss from their below-ground biomass. This study demonstrated that the ability to alter sediment redox potential differs between macrophytes, according to their capacity to transport oxygen. Of the emergent macrophytes, Typha domingensis increased sediment redox potential (218 mV above bare sediment) to a greater extent than Bolboschoenus caldwellii (41 mV above bare sediment). However, the inhibition of convective flow in T. domingensis reduced its oxidizing ability by 78 mV. In contrast, Potamogeton crispus, a submerged macrophyte, had no influence on sediment redox potential. The presence of T. domingensis also increased phosphorus uptake from the water column by 0.88 mg P m−2 day−1, above that of bare sediments. In addition, inundation predictably decreased sediment redox potential from 175 mV to −176 mV over a 42-day period. Similarly, the addition of cellulose (10 mg L−1) decreased sediment redox potential by 42 mV. Consequently, deposition of organic debris may counteract the oxidizing effects of macrophytes that have a limited capacity to transport oxygen, such as P. crispus. Results suggest that macrophytes play an important role in facilitating the restoration of freshwater systems.

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Phosphorus adsorption/desorption kinetics of bioretention

Thermal Science ◽

10.2298/tsci2004401m ◽

2020 ◽

Vol 24 (4) ◽

pp. 2401-2410

Author(s):

Ying Mei ◽

Xiao-Han Zhu ◽

Long Gao ◽

Hang Zhou ◽

Ya-Jun Xiang ◽

...

Keyword(s):

Iron Powder ◽

Aluminum Powder ◽

Adsorption Properties ◽

Desorption Kinetics ◽

Considerable Influence ◽

Phosphorus Adsorption ◽

Monolayer Adsorption ◽

Effects Of Ph ◽

Adsorption Desorption ◽

Kinetics Of

A bioretention medium has considerable influence on the removal of pollutants, especially phosphorus pollutants. In this paper, the phosphorus adsorption properties of three bioretention media (sand, iron powder, and aluminum powder) are studied, and the effects of pH and ionic strength on the phosphorus adsorption are analyzed. Results show that the phosphorus adsorption isotherm can be well modeled by the Langmuir equation. The experimental results show the monolayer adsorption capacity of sand is the highest, while the iron powder the lowest. The pH of the solution has a considerable influence on the phosphorus adsorption of sand and iron powder, but has a minimal effect on aluminum powder.

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Phosphorus adsorption/desorption processes of estuarine sediment: a case study—Loughor Estuary, UK

Arabian Journal of Geosciences ◽

10.1007/s12517-015-2014-1 ◽

2016 ◽

Vol 9 (3) ◽

Cited By ~ 3

Author(s):

Eqbal Al-Enezi ◽

Bettina Bockelmann-Evans ◽

Roger Falconer

Keyword(s):

Estuarine Sediment ◽

Phosphorus Adsorption ◽

Adsorption Desorption

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Removal of Phosphorus from Wastewater by Different Morphological Alumina

Molecules ◽

10.3390/molecules25133092 ◽

2020 ◽

Vol 25 (13) ◽

pp. 3092

Author(s):

Jianchuan Sun ◽

Awang Gao ◽

Xuhui Wang ◽

Xiangyu Xu ◽

Jiaqing Song

Keyword(s):

Adsorption Capacity ◽

Maximum Adsorption Capacity ◽

X Ray Diffraction ◽

Phosphorus Adsorption ◽

X Ray ◽

Transmission Electron ◽

Ft Ir ◽

Series Of Experiments ◽

Level 1 ◽

Adsorption Desorption

In this work, an organic-free method was used to synthesize different morphological boehmite by controlling the crystallization temperature, and alumina adsorbents were obtained by baking the boehmites at 500 °C. The alumina adsorbents were characterized by X-ray diffraction (XRD), High resolution transmission electron microscope (HRTEM), Fourier transform infrared (FT-IR), N2 adsorption/desorption analysis, and their phosphorus adsorption properties were comparatively investigated by a series of experiments. The results showed that the self-prepared alumina adsorbents were lamellar and fibrous material, while the industrial adsorbent was a granular material. The lamellar alumina adsorbents had the largest specific surface area and showed better phosphorus adsorption capacity. The maximum adsorption capacity could reach up to 588.2 mg·g−1; and only 0.8 g·L−1 of lamellar alumina adsorbent is needed to treat 100 mg·L−1 phosphorus solution under the Chinese level 1 discharge standard (0.5 mg·L−1). Further investigation suggests that the lamellar alumina adsorbent kept high adsorption capacity in various solution environments.

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Phosphorus adsorption/desorption processes in the tropical Saigon River estuary (Southern Vietnam) impacted by a megacity

Estuarine Coastal and Shelf Science ◽

10.1016/j.ecss.2019.106321 ◽

2019 ◽

Vol 227 ◽

pp. 106321 ◽

Cited By ~ 5

Author(s):

Tuyet T.N. Nguyen ◽

Julien Némery ◽

Nicolas Gratiot ◽

Josette Garnier ◽

Emilie Strady ◽

...

Keyword(s):

River Estuary ◽

Phosphorus Adsorption ◽

Southern Vietnam ◽

Adsorption Desorption

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Mechanistic Study of Phosphorus Adsorption onto Iron Z-A: Spectroscopic and Experimental Approach

Applied Sciences ◽

10.3390/app9224897 ◽

2019 ◽

Vol 9 (22) ◽

pp. 4897 ◽

Cited By ~ 1

Author(s):

Md Saifuddin ◽

Suho Kim ◽

Abdul Aziz ◽

Kwang Soo Kim

Keyword(s):

Sol Gel ◽

Peak Shift ◽

Intensity Change ◽

Mechanistic Study ◽

Phosphate Adsorption ◽

Order Kinetic ◽

Band Shift ◽

Phosphorus Adsorption ◽

Ft Ir ◽

Adsorption Desorption

Iron was incorporated into an LTA type zeolite using the sol-gel hydrothermal method to form Iron-zeolite-A (Iron-Z-A), and its phosphate adsorption-desorption efficiency were analyzed. Samples were characterized by EDS, SEM, XRD, EPR, FT-IR XPS, and Raman to ensure the apt synthesis of Iron-Z-A and to interpret the mechanism of adsorption-desorption of PO43− in an aqueous solution. EPR and XPS analysis confirmed that the iron was doped as Fe3+ in the LTA structure. The XPS peak shift (Fe-2p), FT-IR band shift, and intensity change (–OH) confirmed the existence of the ligand exchange mechanism. In the adsorption phase at pH 5, the derivative of phosphate (H2PO4−) acts as a ligand and interacts with OH of Fe on the zeolite surface to form “Iron-zeolite (oxy) hydroxide bound phosphate”. In the desorption phase at pH 10, phosphate ligand is detached and get mixed in the aqueous phase as HPO42−. The EDS data, Si–O–Al band shift and intensity change in FT-IR and XPS peak intensity change proved the contribution of Al in the process of adsorption. The data of adsorption fitted well with the Langmuir’s isotherm and pseudo-second-order kinetic model. The amount of PO43− adsorbed was a function of adsorbent’s surface area regardless of concentration. The amount of PO43− being adsorbed by the metal ions was found to be 382.296 mg PO43−/g Fe and 56.296 mg PO43−/g Al.

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