Remediation of saline–sodic soil with flue gas desulfurization gypsum in a reclaimed tidal flat of southeast China

Mao, Yumei; Li, Xiaping; Dick, Warren A.; Chen, Liming

doi:10.1016/j.jes.2016.01.006

Cited by 59 publications

(45 citation statements)

References 21 publications

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“…Our result showing FGD-gypsum would not reduce the water retain and fertilizer of soil is consistent with the study of Mao et al [6]. Meanwhile, study of Mao et al [6] also has shown that FGD-gypsum could reduce soil ESP and exchangeable sodium and the change rule of ESP is similar to that of exchangeable sodium.…”

Section: Soil Alkalinitysupporting

confidence: 90%

“…Meanwhile, study of Mao et al [6] also has shown that FGD-gypsum could reduce soil ESP and exchangeable sodium and the change rule of ESP is similar to that of exchangeable sodium. The key to the improvement of saline-soil is the reduction of soil ESP.…”

Section: Soil Alkalinitymentioning

confidence: 97%

“…The soil samples were collected at plough layer, then air-dried, disaggregated, sieved (2 mm), and mixed well for soil column leaching experiment. The soil physicochemical properties were 2.64 g•cm -3 for soil density, 1.2 g•cm -3 for bulk density, 1.092 mS•cm -2 for conductivity, 38% for moisture content, 1.29×10 3 mg•kg -1 for soil total salt, 9.07 for pH, 30.61% for ESP, which belonged to typical severe saline-soil, and the soil main soluble salt was sodic salt [6].…”

Section: Soil Samples and Fgd Gypsummentioning

confidence: 98%

“…The region has a typical subtropical monsoon climate, the annual average temperature is 15.3℃, the hottest months are July and August (monthly average temperature 26.8-26.9℃), and the annual average evaporation capacity (1346 mm) is higher than the annual average precipitation (1078 mm) [6]. The soil samples were collected at plough layer, then air-dried, disaggregated, sieved (2 mm), and mixed well for soil column leaching experiment.…”

Section: Soil Samples and Fgd Gypsummentioning

confidence: 99%

“…In the United States, the agricultural utilization rate of FGD-gypsum increased from 2% to 5% in the total output of FGD gypsum from 2006 to 2013. In 2015, the USDA officially put the FGD-gypsum as a soil conditioner as the best national agricultural practice [5,6]. Shanghai is on the tip of the Yangtze Delta, which has distinctive physicochemical properties, has around 960 km 2 coastal saline-soil which accounts for more than 15% of the city's land area.…”

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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Section: Soil Alkalinitysupporting

confidence: 90%

Section: Soil Alkalinitymentioning

confidence: 97%

Section: Soil Samples and Fgd Gypsummentioning

confidence: 98%

Section: Soil Samples and Fgd Gypsummentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

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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Water Management and Chemical Amendments in the Remediation of Saline and Sodic Soils

Westhoff,

DeSutter,

Oster

et al. 2024

ASA, CSSA, and SSSA Books

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Effects of calcium amendments on hydraulic conductivity and sodium content of brine‐impacted soils

Peterson,

DeSutter,

Daigh

et al. 2024

Agrosystems Geosci & Env

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High concentrations of sodium chloride dominate oilfield produced waters (brine) of the Williston Basin. When accidental spills of produced waters occur, there is an immediate need to reduce concentrations of chloride, to protect surface and groundwater systems and to reduce concentrations of sodium (Na) in soil to prevent any unwanted swelling and dispersion in soil. Swelling and dispersion of soils will likely occur if sodium adsorption ratio values are too high and the electrical conductivity drops below a certain threshold that is required to maintain flocculation. To prevent this, a calcium (Ca) amendment can be applied to replace Na with Ca on soil exchange sites. Historically, gypsum has been the most common Ca amendment used for improving brine impacted soils. Flue gas desulfurization gypsum is available in North Dakota but is still a sparingly soluble amendment. The purpose of this research was to investigate the use of calcium acetate (Ca‐Ac) as an amendment for brine‐impacted soils as compared to gypsum. Ca‐Ac has a similar concentration of Ca compared to gypsum but is over 100 times more soluble than gypsum. This laboratory experiment will compare how varying levels of gypsum and Ca‐Ac can influence soil hydraulic conductivity, and chemical and physical properties when mixed with oilfield brine‐impacted soils.

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Remediation of saline–sodic soil with flue gas desulfurization gypsum in a reclaimed tidal flat of southeast China

Cited by 59 publications

References 21 publications

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

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

Water Management and Chemical Amendments in the Remediation of Saline and Sodic Soils

Effects of calcium amendments on hydraulic conductivity and sodium content of brine‐impacted soils

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