Cation exchange properties of hydrothermally treated coal fly ash
Article Abstract:
Fly ash samples were treated with NaOH at 100 degrees celsius and analyzed using x-ray diffraction to determine their cation exchange characteristics. The results showed that the level of conversion was limited by mullite, which remained stable throughout treatment. The treatment resulted in a significant decrease in the amount of extractable toxic elements. The findings indicate that zeolited fly ash can be used as a polishing treatment for industrial waste waters.
Publication Name: Environmental Science & Technology
Subject: Science and technology
ISSN: 0013-936X
Year: 1995
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Base cation depletion and potential long-term acidification of Norwegian catchments
Article Abstract:
Long-term trends in weekly streamwater samples obtained from four different catchments in Norway were analyzed to gain an understanding of water quality evolution under different deposition regimes. It is shown that sulfate deposition and runoff sulfate concentrations have declined since the 1970s but this has not resulted in water quality improvement because of equal declines in calcium and magnesium.
Publication Name: Environmental Science & Technology
Subject: Science and technology
ISSN: 0013-936X
Year: 1995
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Anion sequestering by the formation of anionic clays: lime treatment of fly ash slurries
Article Abstract:
Fly ash slurries from electricity generating plants were treated with hydrated lime and dolomite to form anionic clays that reduce the impact of anionic-form elements in the fly ash leachate. The hydrated lime and dolomite treatment reduced the amount of borate, sulfate, and arsenate concentrations by two orders of magnitude and enabled the treated fly ash to be used in agricultural applications.
Publication Name: Environmental Science & Technology
Subject: Science and technology
ISSN: 0013-936X
Year: 1997
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