NDLI: Gypsum Precipitation – A Medium to Control Sulphate Pollution of Freshwater Sediment Leachates

Content Provider	Springer Nature Link
Author	Fajtl, Jiří Tichý, Richard Ledvina, Rostislav
Copyright Year	2002
Abstract	To treat sulphate pollution resulting from freshwater sediments,an experimental study was done. This experimental study was carried out to determine the effects of pH values and calcium supplements (as CaCl$_{2}$) on the formation of gypsum in a representative wetland sediment that was aerated. It was foundthat the differences between dissolved sulphate in untreatedcontrol and the other treatments with CaCl$_{2}$ amendments canbe attributed to the precipitation of gypsum. At the same time, the system was highly affected by Ca adsorption/desorption thatwas controlled by pH values. ECOSAT equilibrium simulations showed that CaCl$_{2}$ additions (0.2–0.3 mol L$^{-1}$) to aerated freshwater sediment resulted in removal of 78–98% ofsulphate (from its total content) from the solution. It wascaused by favourable conditions for gypsum formation i.e. acidicpH values were not increased due to the neutral character of CaCl$_{2}$. On the contrary to CaCl$_{2}$ amendments, CaCO$_{3}$supplements (in the same Ca doses as applied in CaCl$_{2}$) caused the removal of only 5–25% of sulphate. The significantincrease of pH values after the application of CaCO$_{3}$ limitedgypsum formation due to high saturation of the system with CO$_{3}$ $^{-2}$ and HCO$_{3}$ $^{-}$. It resulted in the prevalence of CaCO$_{3}$ formation in this system. However, theaddition of Cl$^{-}$ can facilitate the mobilisation of cationicmetals like Cd and Pb in the form of Cl$^{-}$-complexes. Therefore, CaCl$_{2}$ treatment should be used in the sites thatdo not contain elevated amounts of these metals.
Starting Page	141
Ending Page	156
Page Count	16
File Format	PDF
ISSN	00496979
Journal	Water, Air, and Soil Pollution
Volume Number	135
Issue Number	1-4
e-ISSN	15732932
Language	English
Publisher	Kluwer Academic Publishers
Publisher Date	2002-01-01
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Hydrogeology Atmospheric Protection/Air Quality Control/Air Pollution
Content Type	Text
Resource Type	Article
Subject	Ecological Modeling Environmental Chemistry Pollution Environmental Engineering Water Science and Technology

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
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3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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