Amelioration of alkali soil using flue gas desulfurization byproducts: Productivity and environmental quality

Wang, S.J.; Chen, C.H.; Xu, Xin; Li, Y.J.

doi:10.1016/j.envpol.2007.02.014

Cited by 44 publications

(42 citation statements)

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“…There have been a few cases where the soil ESP has been extremely high. For these cases, the application ratio of the FGD gypsum amendment was still < 60 t/ha (Wang et al, 2008). Since gypsum is not very soluble, experience has shown that reclamation effects using FGD gypsum on sodic or saline-alkali soils can be effective for 5-10 years (Wang et al, 2008).…”

Section: Further Discussionmentioning

confidence: 99%

“…GB15618-1995 also superintends limits for other heavy metals, such as Zn and Cu, in addition to those listed in Table 1. These metals were not investigated in this work because results of previous studies showed that the Zn and Cu concentrations in FGD-treated soils were much lower than those specified in the GB15616-1995 regulation Wang et al, 2008). In addition, within certain limits, Zn and Cu are essential to biochemical processes in organisms (Chen et al, 2012).…”

Section: Distributions Of the Heavy Metals Among The Soil Layersmentioning

confidence: 99%

“…The concentrations of other trace elements in the FGD gypsum are closely related to the coal elemental composition, limestone properties, and processes upstream of the FGD. As a result, the contents of these elements in FGD gypsum (usually < 1%) vary slightly for different power plants (Wang et al, 2008;Shi et al, 2011). For convenience, an FGD gypsum sample was collected from a local power plant with a typical commercial wet FGD process widely used in the country.…”

Section: Soil Samples and Fgd Gypsummentioning

confidence: 99%

“…Therefore, using FGD gypsum produced by the power industry in the agricultural sector to reclaim sodic soils could be one of the best solutions of this FGD by-product . Sodic or saline-alkali soil reclamation by FGD gypsum has been demonstrated to effectively improve crop production (Wang et al, 2008). To date, this reclamation practice led by Tsinghua University has been conducted in over 10 Chinese provinces with a total area exceeding 6,000 hectares.…”

mentioning

confidence: 99%

“…The introduction of heavy metals with the FGD gypsum into the sodic soils may give rise to ecological hazards in the soil environment. Previous studies have indicated that heavy metal contents in some commercial FGD gypsum were compliant with the Chinese Environmental Quality Standard for Soils (GB15618-1995) Wang et al, 2008). Stout and Priddy (1996) used FGD gypsum to reduce subsoil acidity of a Rayne soil and increased alfalfa dry matter yields by 14%.…”

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confidence: 99%

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Influence of Flue Gas Desulfurization Gypsum Amendments on Heavy Metal Distribution in Reclaimed Sodic Soils

Chen

Wang

et al. 2015

Environmental Engineering Science

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Although flue gas desulfurization (FGD) gypsum has become an effective soil amendment for sodic soil reclamation, it carries extra heavy metal contamination into the soil environment. The fate of heavy metals introduced by FGD gypsum in sodic or saline-alkali soils is still unclear. This work aims to investigate the effects of FGD gypsum addition on the heavy metal distributions in a sodic soil. Original soil samples were collected from typical sodic land in north China. Soil column leaching tests were conducted to investigate the influence of FGD gypsum addition on the soil properties, especially on distribution profiles of the heavy metals (Pb, Cd, Cr, As, and Hg) in the soil layers. Results showed that pH, electrical conductivity, and exchangeable sodium percentage in amended soils were significantly reduced from 10.2 to 8.46, 1.8 to 0.2 dS/m, and 18.14% to 1.28%, respectively. As and Hg concentrations in the soils were found to be positively correlated with FGD gypsum added. The amount of Hg in the leachate was positively correlated with FGD gypsum application ratio, whereas a negative correlation was observed between the Pb concentration in the leachate and the FGD gypsum ratio. Results revealed that heavy metal concentrations in soils complied well with Environmental Quality Standard for Soils in China (GB15618-1995). This work helps to understand the fate of FGD gypsum-introduced heavy metals in sodic soils and provides a baseline for further environmental risk assessment associated with applying FGD gypsum for sodic soil remediation.

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Section: Further Discussionmentioning

confidence: 99%

Section: Distributions Of the Heavy Metals Among The Soil Layersmentioning

confidence: 99%

Section: Soil Samples and Fgd Gypsummentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Influence of Flue Gas Desulfurization Gypsum Amendments on Heavy Metal Distribution in Reclaimed Sodic Soils

Chen

Wang

et al. 2015

Environmental Engineering Science

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Quantitative evaluation of pore characteristics of sodic soils reclaimed by flue gas desulphurization gypsum using X‐ray computed tomography

Liao

Yang

et al. 2020

Land Degrad Dev

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Flue gas desulphurization (FGD) gypsum can effectively remediate sodic soils through improving two‐dimensional/three‐dimensional (3D) soil pore characteristics, especially vertical macroporosity. Understanding the response pattern of pore characteristics of sodic soils with different textures to FGD gypsum reclamation measures is critical to formulating appropriate improvement strategies for addressing growing challenges of land degradation. The objectives of this study were (a) to quantify the effect of FGD gypsum on two‐dimensional/three‐dimensional pore characteristics of amended sodic soils using X‐ray computed tomography (CT); and (b) to investigate the response pattern of different sodic soils to reclamation measures. Three types of intact sodic soils (sandy loam, silty loam, and silt soil) were collected from different sodic fields in north China for X‐ray CT image scan, and soil pore characteristic parameters (including porosity, pore network density, pore length density, and tortuosity) were measured. The results indicate that the high proportion of horizontal pores and lower pore length density are typical features in the sodic soils investigated. The responses of three sodic soils to reclamation measures demonstrate obvious variations that the 3D macroporosity of silt sodic soils was significantly increased (p < .05) by 53.7%, showing more sensitive and better effect than that of sandy loam (52.9%) and silty loam (20%) sodic soils, in which the reclamation improved the vertical macroporosity of silt sodic soil by 164.6%. It is speculated that the higher clay and silt contents in the silt sodic soils and their interaction with gypsum contribute to the expansion of pore size, and the formed macropore promotes the vertical migration of clay and silt particles to further increase the vertical macroporosity. In addition, FGD gypsum is beneficial for the formation of new pores in silt loam soils. The findings of this study confirm the feasibility of quantifying pore characteristics of sodic soils with the help of X‐ray CT images and suggest that it is necessary to adopt specific reclamation strategies for different degraded sodic soils.

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The Effects of Modified Flue Gas Desulfurization Residue on Growth of Sweet Potato and Soil Amelioration

Wang

Shi

2015

Water Air Soil Pollut

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We report on treatment and disposal of flue gas desulfurization (FGD) as a solid and hazardous waste. The effects of modified flue gas desulfurization residue (MFGDR) prepared by calcining a mixture of dry/semi-dry FGD residue, potassium feldspar, and/or limestone power on growth of plant and soil amelioration are investigated. The effect of MFGDR on the sweet potato was evaluated by analyzing the soil physiochemical properties and heavy metal speciation in the soil, and the yield, quality, and heavy metal concentrations of the sweet potato. The results indicated that applying MFGDR as soil ameliorant increased total yield by 53.38 %, safety, and the quality of sweet potato. The concentrations of Cd, Cr, Cu, Pb, and As in the sweet potato reduced by 31.34, 70.57, 22.17, 79.49, and 100 %, respectively. The improvements were attributed to enhancement of soil mineral composition contained in MFGDR. The MFGDR could also improve the soil p hy s i c oc h e m i c a l p r o p e r t i e s a n d de c r e a s e d phytoavailability of heavy metals. The application of MFGDR in agriculture not only was a potential and useful technique for recycling and utilization of FGD residue, but also had potential benefits for soil amelioration, plant growth, and decrease of heavy metals in grown products.

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Amelioration of alkali soil using flue gas desulfurization byproducts: Productivity and environmental quality

Cited by 44 publications

References 1 publication

Influence of Flue Gas Desulfurization Gypsum Amendments on Heavy Metal Distribution in Reclaimed Sodic Soils

Influence of Flue Gas Desulfurization Gypsum Amendments on Heavy Metal Distribution in Reclaimed Sodic Soils

Quantitative evaluation of pore characteristics of sodic soils reclaimed by flue gas desulphurization gypsum using X‐ray computed tomography

The Effects of Modified Flue Gas Desulfurization Residue on Growth of Sweet Potato and Soil Amelioration

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