Why is calcite a strong phosphorus sink in freshwater? Investigating the adsorption mechanism using batch experiments and surface complexation modeling

Flower, Hilary; Rains, Mark C.; Taşcı, Yasemin; Zhang, Jiazhong; Trout, Kenneth E.; Lewis, David B.; Das, Arundhati; Dalton, Robert

doi:10.1016/j.chemosphere.2021.131596

Cited by 10 publications

(4 citation statements)

References 59 publications

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“…The correlation coefficients (R 2 ) of Langmuir adsorption isotherm were slightly higher than those of Freundlich adsorption isotherm, which were consistent with the previous works [34]. This might be ascribed to the coordination complexation of P with active sites in the surface of BFS, which was named chemical adsorption and dominated the process of P adsorbed in the surface of BFS [11]. In addition, the fitting results of the Langmuir adsorption isotherm showed that the theoretical maximum adsorption capacity of BFS1 and BFS2 was 0.3056 mg g −1 and 0.1275 mg g −1 , respectively, indicating that the P adsorption capacity of fine-grained BFS was significantly higher than that with large-sized particles.…”

Section: Adsorption Isothermsupporting

confidence: 90%

“…As a typical process used in rural domestic sewage dephosphorization [9], constructed wetland (CW) is mainly composed of filters, plants, microorganisms, and other components Water 2022, 14, 2452 2 of 14 and removes pollutants in wastewater via physical filter, chemical precipitation and biological degradation [10,11]. For P removal, the main method includes chemical adsorption of phosphate via coordination complexation and ion exchange, physical adsorption triggered by electrostatic attraction, and the subsequent chemical deposition on filter surface [12,13].…”

Section: Introductionmentioning

confidence: 99%

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Phosphorus Adsorption on Blast Furnace Slag with Different Magnetism and Its Potential for Phosphorus Recovery

Zhan

Liu

et al. 2022

Water

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Phosphorus (P) is one of the essential nutrients for all life but also is involved in the major factor of water eutrophication. This study aimed to investigate a low-cost approach for highly efficient P removal and recovery from wastewater with blast furnace slag (BFS) as the adsorbent. The adsorption characteristics were consistent with the Langmuir adsorption isotherm (q0 0.1370~0.3848 mg/g) and quasi-secondary kinetic model (R2 = 0.9986~0.9997), suggesting monomolecular-layer chemical adsorption might be the dominant pathway. According to the determination of scanning electron microscope and energy dispersive spectroscopy, P was distributed uniformly with other elements in the surface of BFS and even formed needle-like crystals. This indicated that P might be also further deposited in the surface of BFS after the initially chemical adsorption via coordination with the active sites, which led to the slow accumulation of P along with the adsorption experiments. The binding energy and atomic composition analysis of X-ray photoelectron spectroscopy revealed that phosphate mainly existed as HPO42− in the surface of BFS, especially for those non-magnetic particles with relative low Fe content (<30%), indicating the preference of P to the hydroxyl basic sites. Compared with those magnetic particles, the adsorption capacity of the non-magnetic particles was larger and could be restored more easily with the elution of sulfate acid, resulting in about two times the P recovery capability. Based on the P adsorption mechanism in the surface of BFS, the operation conditions of the BFS adsorption column for P recovery were optimized in an alkaline condition with a low phosphate concentration and long residual time. Therefore, non-magnetic BFS with small size could be used to recover P resources from rural wastewater with low P concentration and facilitated the on-site reuse of P resources in rural districts.

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Section: Adsorption Isothermsupporting

confidence: 90%

Section: Introductionmentioning

confidence: 99%

Phosphorus Adsorption on Blast Furnace Slag with Different Magnetism and Its Potential for Phosphorus Recovery

Zhan

Liu

et al. 2022

Water

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“…Figure 7 shows the re efficiencies for TOC, TN, and TP in the wastewater obtained via washing for 10 m filtration. The removal efficiencies for TOC, TN, and TP for the OSF filtrates were 59.9%, and 92.3%, respectively, suggesting that most of these pollutants are part Unlike nitrogen, the higher removal efficiency of TP after filtration seems to reflect chemical properties, which have a strong adsorption affinity onto the suspended p [33,34]. The generation of a large amount of wastewater is essential when using Table 2 shows the comparative XRF results for the shells and whether or n were washed.…”

Section: Washing Characteristics Of Oyster Shell Applied To a Simulat...mentioning

confidence: 98%

“…The removal efficiencies for TOC, TN, and TP for the OSF filtrates were 93.4%, 59.9%, and 92.3%, respectively, suggesting that most of these pollutants are particulate. Unlike nitrogen, the higher removal efficiency of TP after filtration seems to reflect its own chemical properties, which have a strong adsorption affinity onto the suspended particles [33,34]. The generation of a large amount of wastewater is essential when using a wet-type trommel for washing.…”

Section: Washing Characteristics Of Oyster Shell Applied To a Simulat...mentioning

confidence: 99%

Evaluation of Washing and Screening for Upgrading the Calcium Content of Oyster Shells Using a Simulated Wet-Type Trommel

Lee

Kim

2022

Sustainability

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The oyster shells produced at shucking sites contain various organic and inorganic impurities and are discharged without proper pretreatment. In the present study, we confirmed a process for removing organic/inorganic impurities and salts from abandoned shells using a wet type of trommel. A particle size analysis showed that the inorganic impurities in the studied shells were Si, Fe, Al, etc. derived from sediment, and their contents were relatively rich in fine particles. Dissolved ions (Cl−, SO42−, and NO3−) and organic matter (carbon, nitrogen, and phosphorus) can be removed concurrently for a short period (<5 min) by a trommel. The higher removal efficiencies for total organic carbon (TOC, ~93.4%), total nitrogen (TN, ~59.9%), and total phosphorous (TP, ~92.9%) in the washing wastewaters after filtration not only indicate increased organic matter in the fine particles derived from crushed shells during trommel operation, but also that a certain portion could be removed by precipitation. However, considering that a small amount of salt compounds (Na and Cl) still remains in the shell even after calcination followed by washing, the scope of shell use must be considered.

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Storms and pH of dam releases affect downstream phosphorus cycling in an arid regulated river

Deemer,

H. Reibold,

Fatta

et al. 2023

Biogeochemistry

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Why is calcite a strong phosphorus sink in freshwater? Investigating the adsorption mechanism using batch experiments and surface complexation modeling

Cited by 10 publications

References 59 publications

Phosphorus Adsorption on Blast Furnace Slag with Different Magnetism and Its Potential for Phosphorus Recovery

Phosphorus Adsorption on Blast Furnace Slag with Different Magnetism and Its Potential for Phosphorus Recovery

Evaluation of Washing and Screening for Upgrading the Calcium Content of Oyster Shells Using a Simulated Wet-Type Trommel

Storms and pH of dam releases affect downstream phosphorus cycling in an arid regulated river

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