Characterisation of the leaching behaviour of coal fly ash with tank leaching test method

Khoo Kok Siong Kok Siong, Sukiman Sarmani, Lim Ai Ling

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Characterisation of the leaching behaviour of coal fly ash from Tenaga Nasional Berhad (TNB) by using tank leaching test method has been reported. The leachability of the constituents such as major elements and toxic metals in the coal fly ash was studied. Eight renewed leachant solutions after 6 hours, 1, 2, 5, 8, 21, 36 and 64 days were investigated after filtration. The parameters namely pH, cumulative release regarding the major elements and toxic metals to duration were presented. The results showed that the pH solutions increased from pH 4 to neutral and remained stable during the test. It might have resulted from the large buffering capacity of the coal fly ashes. Five major elements namely Al, Ca, K, Mg and Na were detected with Ca concentration in the leachant solutions was the highest for all samples. Toxic metals such as As, Ba, Co, Cr, Mn, Ni, Pb, Se and Zn were found and the test showed consistent results on the As, Ba, Mn, Se and Zn in leachant solutions. The findings also showed that some of the toxic metal concentrations namely As, Ba, Cr, Pb and Se exceeded the maximum allowance of the guideline of drinking water quality in Malaysia and WHO. Obviously, proper waste management has to be applied in this scenario.

Original languageEnglish
Pages (from-to)45-52
Number of pages8
JournalSains Malaysiana
Volume36
Issue number1
Publication statusPublished - Jul 2007

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fly ash
leaching
coal
buffering
waste management
drinking water
water quality
method
toxic metal
test

Keywords

  • Coal fly ash
  • Major elements
  • Tank leaching test
  • Toxic metals

ASJC Scopus subject areas

  • General

Cite this

Characterisation of the leaching behaviour of coal fly ash with tank leaching test method. / Kok Siong, Khoo Kok Siong; Sarmani, Sukiman; Ling, Lim Ai.

In: Sains Malaysiana, Vol. 36, No. 1, 07.2007, p. 45-52.

Research output: Contribution to journalArticle

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