Enhanced adsorption capacity for phosphate in wastewater from thermally activated flue gas desulfurization gypsum

Cheng, Ping; Chen, Dong; Zou, Xuehua; Zhang, Yaqing; Xie, Jingjing; Qing, Chen; Chen, Tianhu

doi:10.1002/jctb.5546

Cited by 10 publications

(4 citation statements)

References 52 publications

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“…By contrast, there was a noticeable impact of solution pH on the gypsum for DIP sorption. As shown in Figure 3, the removal rates of DIP by the gypsum increased with increasing solution pH, which is consistent with other Ca‐ or Mg‐based PSMs (Bal Krishna et al., 2017; Bowden et al., 2009; Cheng et al., 2018; Fang et al., 2022; Li et al., 2018). On the contrary, La‐, Fe‐, and Al‐based PSMs could be more efficient to adsorb DIP in low pH solutions (Aryee et al., 2020).…”

Section: Resultssupporting

confidence: 85%

“…It indicates the occurrence of an interaction between Ca and P oxygens, which forms CaHPO 4 in the P‐laden designer biochar. The peaks at 1069–1081 cm −1 corresponding to the asymmetric vibration of P─O (Bolbol et al., 2019) appeared in the P‐laden biochar spectrum, suggesting Ca 2+ derived from the designer biochar reacts with PO 4 3− during P removal (Cheng et al., 2018).…”

Section: Resultsmentioning

confidence: 99%

“…Previous studies reported that the direct application of FGD gypsum to agricultural soils could reduce P losses to surrounding watersheds (King et al., 2016; Torbert & Watts, 2014; Watts & Torbert, 2016). In addition, FGD gypsum has also been used as a Ca‐based PSM to remove excess P from nutrient‐containing water (Bryant et al., 2012; Cheng et al., 2018; Hamid et al., 2023). Unlike Fe or Al‐based PSMs, Ca or other metals released from gypsum are usually below levels of concern or not toxic to the ecological environment (Torbert et al., 2018).…”

Section: Introductionmentioning

confidence: 99%

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Enhancing dissolved inorganic phosphorous capture by gypsum‐incorporated biochar: Synergic performance and mechanisms

et al. 2023

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Excess nutrients such as phosphorus (P) in watersheds jeopardize water quality and trigger harmful algal blooms. Using phosphorus sorption material (PSM) to capture P from wastewater and agricultural runoff can help recover nutrients and prevent their water pollution. In this study, a novel designer biochar was generated by pyrolyzing woody biomass pretreated with a flue gas desulfurization gypsum. The removal of dissolved inorganic phosphorus (DIP) by the gypsum‐incorporated designer biochar was more efficient than the gypsum, suggesting the pretreatment of biomass with the gypsum results in a synergic effect on enhancing DIP capture. The maximum P adsorption capacity of the designer biochar was more than 200 mg g−1, which is one order of magnitude greater than that of the gypsum. This result clearly showed that the designer biochar is a better PSM to capture DIP from nutrient‐contaminated water compared to the gypsum. Post‐sorption characterization indicated that the sorption of DIP by the gypsum‐incorporated biochar involves multiple mechanisms. The precipitation reactions of Ca cations and P anions to form CaHPO4 and Ca3(PO4)2 precipitates on the highly alkaline surface of the designer biochar were identified as a main mechanism. By contrast, CaHPO4·2H2O is the only precipitated product for DIP sorption by the gypsum. In addition, the initial solution pH and the coexisting bicarbonate had less effects on the DIP removal by the designer biochar in comparison with the gypsum, which further confirms the former is an excellent PSM to capture DIP from a variety of aquatic media.This article is protected by copyright. All rights reserved

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Section: Resultssupporting

confidence: 85%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Enhancing dissolved inorganic phosphorous capture by gypsum‐incorporated biochar: Synergic performance and mechanisms

et al. 2023

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“…FGD gypsum can be a product that has many applications in different industries. It is used in agriculture [ 9 , 10 ], civil engineering [ 11 , 12 ], water treatment [ 13 ], sorption of phosphorus ions [ 14 ] and the glass industry [ 2 ]. FGD gypsum is widely applied in the construction industry as a setting retarder in Portland cement [ 8 , 15 , 16 , 17 ], for producing calcium sulphoaluminate cement [ 18 ], as high-strength building materials [ 19 ] and as a component of gypsum plaster [ 20 ].…”

Section: Introductionmentioning

confidence: 99%

Analysis of Compressive Strength of Anhydrite Binder Using Full Factorial Design

Nizevičienė,

Kybartienė,

Jusas

2023

Materials

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Flue gas desulfurization gypsum (FGD gypsum) is obtained from the desulphurization of combustion gases in fossil fuel power plants. FGD gypsum can be used to produce anhydrite binder. This research is devoted to the investigation of the influence of the calcination temperature of FGD gypsum, the activators K2SO4 and Na2SO4, and their amount on the compressive strength of anhydrite binder during hydration. The obtained results showed that as the calcination temperature increased, the compressive strength of anhydrite binder decreased at its early age (up to 3 days) and increased after 28 days. The compressive strength of the anhydrite binder produced at 800 °C and 500 °C differed more than five times after 28 days. The activators K2SO4 and Na2SO4 had a large effect on the hydration of anhydrite binder at its early age (up to 3 days) in comparison with the anhydrite binder without activators. The presence of the activators of either K2SO4 or K2SO4 almost had no influence on the compressive strength after 28 days. To determine which factor, the calcination temperature of FGD gypsum (500–800 °C), the hydration time (3–28 days) or the amount (0–2%) of the activators K2SO4 and Na2SO4, has the greatest influence on the compressive strength, a 23 full factorial design was applied. Multiple linear regression was used to develop a mathematical model and predict the compressive strength of the anhydrite binder. The statistical analysis showed that the hydration time had the strongest impact on the compressive strength of the anhydrite binder using activators K2SO4 and Na2SO4. The activator K2SO4 had a greater influence on the compressive strength than the activator Na2SO4. The obtained mathematical model can be used to forecast the compressive strength of the anhydrite binder produced from FGD gypsum if the considered factors are within the same limiting values as in the suggested model since the coefficient of determination (R2) was close to 1, and the mean absolute percentage error (MAPE) was less than 10%.

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Facile synthesis of magnetic biochar from an invasive aquatic plant and basic oxygen furnace slag for removal of phosphate from aqueous solution

Zhou

Shen

Xiang

et al. 2023

Biomass and Bioenergy

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Enhanced adsorption capacity for phosphate in wastewater from thermally activated flue gas desulfurization gypsum

Cited by 10 publications

References 52 publications

Enhancing dissolved inorganic phosphorous capture by gypsum‐incorporated biochar: Synergic performance and mechanisms

Enhancing dissolved inorganic phosphorous capture by gypsum‐incorporated biochar: Synergic performance and mechanisms

Analysis of Compressive Strength of Anhydrite Binder Using Full Factorial Design

Facile synthesis of magnetic biochar from an invasive aquatic plant and basic oxygen furnace slag for removal of phosphate from aqueous solution

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