Flue gas desulfurization gypsum application for enhancing the desalination of reclaimed tidal lands

Li, Xiaoping; Mao, Yumei; Liu, Xiaochen

doi:10.1016/j.ecoleng.2015.04.010

Cited by 29 publications

(11 citation statements)

References 6 publications

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“…In particular, the flue gas desulphurization (FGD) gypsum, a powder‐like by‐product generated by coal‐fired power plants has been identified as a promising alternative to pure gypsum because of its high gypsum content and low cost (Amezketa, Aragüés, & Gazol, ; Baligar, Clark, Korcak, & Wright, ; Wang, Chen, Xu, & Li, ). Previous studies have demonstrated the effectiveness of FGD gypsum in sodic soil reclamation as it can decrease soil bulk density, ESP and pH, improve water infiltration and water stability of soil aggregates, and reduce the erodibility of sodic soils (Rhoton & Mcchesney, ; Li, Mao, & Liu, ; Wang, Chen, Li, Zhuo, & Xu, ; Zhao et al, ). A suitable pore structure promotes the transport and exchange of water, air, and solute in these soils, thus maintaining a suitable supply to crop production.…”

Section: Introductionmentioning

confidence: 99%

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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Section: Introductionmentioning

confidence: 99%

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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“…FGD-gypsum could decrease soil pH, but the decreasing extent of soil pH is not increased with increasing ratios of FGD-gypsum, which is consist with study of Sakai et al [10]. Saline-soil's high pH is controlled by exchangeable sodium and water-soluble CO 3 2-+HCO 3 -. FGD-gypsum decreasing soil pH is due to that calcium ion from FGD-gypsum reacts with CO 3 2-+HCO 3 -to generate CaCO 3 deposition and replaces exchangeable sodium which is leached out [10].…”

Section: Soil Phmentioning

confidence: 99%

“…Saline-soil's high pH is controlled by exchangeable sodium and water-soluble CO 3 2-+HCO 3 -. FGD-gypsum decreasing soil pH is due to that calcium ion from FGD-gypsum reacts with CO 3 2-+HCO 3 -to generate CaCO 3 deposition and replaces exchangeable sodium which is leached out [10].…”

Section: Soil Phmentioning

confidence: 99%

“…In China, there are around 66,700 km 2 coastal saline-soil, which is distributed in coastal areas，such as Shandong, Hebei, Liaoning, Zhejiang, Fujian, Guangdong [1]. The coastal areas are at the junction of the sea and the land, which has high groundwater level, tidal erosion, frequent supply of seawater and evaporation-concentration, thereby a large expanse of saline-soil is formed [2,3]. The physical and chemical properties of coastal saline-soil are poor due to the high content of salt, low natural desalination rate, heavy salinization.…”

Section: Introductionmentioning

confidence: 99%

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Study on the desalination process and improvement effect of FGD-gypsum improving coastal saline-soil

Xiao-hua

Hou

2017

IOP Conf. Ser.: Earth Environ. Sci.

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Abstract. To provide theoretical basis for the improvement of Shanghai coastal saline-soil, a soil column leaching experiment was carried out to study the process and improvement effect of soil desalination after soil applying 0.5%, 1%, 2.5%, and 5% mass ratio of FGD-gypsum, aimed at the characteristics of Shanghai coastal saline-soil. The result showed that, compared with the control, applying FGD-gypsum could increase soil saturated hydraulic conductivity by 5.1-6.5 times, increase leaching sodium quality by 11.0%-22.2%, decrease soil pH 0.41-0.11 units, decrease exchangeable sodium percentage (ESP) by 25.1%-76.7%. When FGD-gypsum improved the coastal saline-soil, the change rules of soil's physical and chemical properties were that, soil saturated hydraulic conductivity increased before leveling off, leaching sodium quality gradually increased, soil pH declined before leveling off, ESP reduced with increasing ratios of FGD-gypsum; soil leaching sodium ion concentration decreased sharply and then tended to equilibrium over time, and soil leaching out sodium was active in the first 2 days of leaching. In the process of FGD-gypsum speeding up soil desalination, soil leaching calcium quality and leaching sodium quality had relationship with soil hydraulic conductivity and the ratio of FGD-gypsum, and the leaching out sodium of FGD-gypsum-soil system was more accelerated when calcium ion concentration in soil leacheate was higher.

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“…Setia et al (2013) szerint akár nagy, akár kicsi a talaj összes oldható sótartalma, a kicserélhető kalciumionnak jelentős szerepe van az oldott szerves szén (DOC) adszorpciójában, ezért az öntözővízzel kiadott kalcium csökkentheti a DOC veszteséget a növekvő szén stabilitáson keresztül. Li et al (2015) szerint a Jangce-torkolat talajának kicserélhető nátrium százalék értéke két év alatt 50%-kal csökkent 45 t/ha dózisnál nagyobb gipsz javítóanyag kijuttatása mellett. Jesus (2015) szerint a gipsz alkalmazásával elősegíthető a növények nátrium felvétele, egyfelől mert a szikes talajban a növények kalciumhiányát pótolja, másrészt a kalcium kijuttatással több nátrium válik elérhetővé a talajban, amely korábban adszorbeált formában volt jelen.…”

Section: Gipsz Alkalmazása a Szikes Talajok Javításáraunclassified

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Flue gas desulfurization gypsum application for enhancing the desalination of reclaimed tidal lands

Cited by 29 publications

References 6 publications

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

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

Study on the desalination process and improvement effect of FGD-gypsum improving coastal saline-soil

Intenzív üzemű halnevelő-telepről származó szennyvíz mezőgazdasági elhelyezésének és hasznosításának vizsgálata energiafűz kísérletben

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