Recycling flue gas desulphurization (FGD) gypsum for removal of Pb(II) and Cd(II) from wastewater

Yan, Yubo; Qiao, Li; Sun, Xiuyun; Ren, Zhiyuan; He, Fei; Wang, Yalun; Wang, Lianjun

doi:10.1016/j.jcis.2015.06.035

Cited by 70 publications

(37 citation statements)

References 34 publications

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“…Hence, our study was consistent with previous findings. Complying with pseudo-second-order model suggested chemisorption was the rate-limiting step of the sorption processes of our studied chars(Yan et al, 2015, Inyang et al, 2015…”

mentioning

confidence: 66%

Thermal stability of biochar and its effects on cadmium sorption capacity

Yan

Lamb

et al. 2017

Bioresource Technology

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In this study, the thermal stability of a wood shaving biochar (WS, 650°C), a chicken litter biochar (CL, 550°C) and an activated carbon (AC, 1100°C) were evaluated by combustion at 375°C for 24h to remove the labile non-carbonized organic matter. Results showed that WS and CL biochars were not thermally stable and can lose most of the organic C during combustion. The combusted WS and CL biochars retained considerable amounts of negative charge and displayed higher sorption for Cd (from 5.46 to 68.9mg/g for WS and from 48.5 to 60.9mg/g for CL). The AC retained 76.5% of its original C and became more negatively chargely after combustion, but its sorption for Cd slightly decreased (from 18.5 to 14.9mg/g). This study indicated that after potential burning in wildfires (200-500°C), biochars could have higher sorption capacity for metals by remaining minerals.

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confidence: 66%

Thermal stability of biochar and its effects on cadmium sorption capacity

Yan

Lamb

et al. 2017

Bioresource Technology

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“…26 Applied as an environmental functional material, FGD gypsum has been recycled as an adsorbent to remove Pb 2+ and Cd 2+ from wastewater. 27 The maximum adsorption capacities of Pb 2+ and Cd 2+ were 161.3 mg g -1 and 32.6 mg g -1 , respectively. A large amount of FGD gypsum is not utilized completely, and FGD gypsum has become the second largest solid waste for coal-fired power plants.…”

Section: Introductionmentioning

confidence: 91%

“…evaluated the effectiveness of FGD gypsum for decreasing phosphate losses in surface runoff discharge from fields with a high soil phosphate concentration using a before‐after control‐impact . Applied as an environmental functional material, FGD gypsum has been recycled as an adsorbent to remove Pb 2+ and Cd 2+ from wastewater . The maximum adsorption capacities of Pb 2+ and Cd 2+ were 161.3 mg g ‐1 and 32.6 mg g ‐1 , respectively.…”

Section: Introductionmentioning

confidence: 99%

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

Cheng

Chen

Zou

et al. 2018

J of Chemical Tech & Biotech

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BACKGROUND In this study, a flue gas desulfurization (FGD) gypsum was calcined as phosphate sorbent materials for the remediation of phosphate wastewater. RESULTS In addition to the main crystalline phase of gypsum, FGD gypsum contains a small quantity of quartz, dolomite, calcite and magnesite. Moreover, FGD gypsum has a prismatic structure with a dense and smooth surface, whereas a pore structure and flaky structure appear with increasing calcination temperature. The kinetic adsorption process was well described by a pseudo‐second‐order model with a high correlation coefficient (R2 > 0.99). The adsorption isotherms indicated that phosphate removal can be fitted by the Langmuir model. CONCLUSIONS Calcination improved the performance of FGD gypsum towards phosphate sorption. The precipitation following chemical adsorption dominated the phosphate removal by the calcined FGD gypsum, and phosphate was ultimately immobilized by hydroxyapatite. Calcined FGD gypsum has excellent capacity for phosphate removal for three reasons: an enhanced content of active Ca by calcination, a novel nanoscale prismatic structure with a high specific surface area, and a favorable reactivity and alkaline environment produced by the decomposition of magnesite, dolomite and calcite. © 2017 Society of Chemical Industry

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“…The sorption isotherms of all soils were L type (Limousin et al, 2007) where the ratio of equilibrium solute concentration in solution to that on soils decreased with increasing solute concentration and suggested the soil surfaces were progressively get saturated by Cd. The sorption isotherms of all soil samples were fitted into Langmuir models, with linear form of this model as follows (Yan et al, 2015):…”

Section: Sorption Isothermsmentioning

confidence: 99%

Effects of acidic and neutral biochars on properties and cadmium retention of soils

Dong

Lamb

et al. 2017

Chemosphere

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In this study, an acidic biochar and a neutral biochar were applied at 5 wt% into two soils for an 11-month incubation experiment. One Ferrosol soil (Ba) was slightly acidic with low organic matter and the other Dermosol soil (Mt) was slightly alkaline with high organic matter. The acidic (pH = 3.25) wood shaving (WS) biochar had no marked impact on nutrient levels, cation exchange capacity (CEC), pH and acid neutralization capacity (ANC) of either soil. By contrast, the neutral (pH = 7.00) chicken litter (CL) biochar significantly increased major soluble nutrients, pH, ANC of soil Ba. In terms of C storage, 87.9% and 69.5% WS biochar-C can be sequestrated as TOC by soil Ba and Mt, respectively, whereas only 24.0% of CL biochar-C stored in soil Ba and negligible amount in Mt as TOC. Biochars did not have significant effects on soil sorption capacity and sorption reversibility except that CL biochar increased sorption of soil Ba by around 25.4% and decreased desorption by around 50.0%. Overall, the studied acidic C rich WS biochar held little agricultural or remedial values but was favourable for C sequestration. The neutral mineral rich CL biochar may provide short-term agricultural benefit and certain sorption capacities of lower sorption capacity soils, but may be unlikely to result in heightened C sequestration in soils. This is the first study comprehensively examining functions of acidic and neutral biochars for their benefits as a soil amendment and suggests the importance of pre-testing biochars for target purposes prior to their large scale production.

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Recycling flue gas desulphurization (FGD) gypsum for removal of Pb(II) and Cd(II) from wastewater

Cited by 70 publications

References 34 publications

Thermal stability of biochar and its effects on cadmium sorption capacity

Thermal stability of biochar and its effects on cadmium sorption capacity

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

Effects of acidic and neutral biochars on properties and cadmium retention of soils

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