• C M Jangam
• D B Panaskar
• P R Pujari

An attempt has been made to evaluate the leaching behaviour of toxic metals of coal fly ash collected from different thermal power plants. Leaching of the heavy metals namely Aluminium (Al) chromium (Cr) Copper (Cu) Cobalt (CO) Mercury (Hg) Manganese (Mn) Lead (Pb) Iron (Fe) and Zinc (Zn) were investigated using two different leaching methods namely, Toxicity Characterization Leaching Procedure (TCLP) and Water Leaching Test (WLT) to check the possibility of groundwater contamination. This study is performed to evaluate factors affecting the leaching of heavy metals like liquid to solid ratio (L/S) and reaction time. The higher concentration of heavy metals in TCLP test indicates that the pH value of the leaching medium significantly affects the transfer of these elements to the liquid medium. The results from WLT show that the toxic metals from fly ash are not easily leached in neutral water but, reaction time and L/S ratio has impact on the leaching behaviour of coal fly ash. However, in the entire leaching test for all the samples, leaching is within the regularity level of USEPA-RCRA-D list. Toxicity Characteristic Leaching Procedure (TCLP) indicates that the toxic metals and elements contained in the coal fly ash could be potentially transferred to the liquid phase depending upon the initial pH of the leaching medium.

Coal Fly Ash, Metals Leaching, TCLP, Water extraction

"Leaching Behaviour of Elements From Coal Fly Ash Using Continuous and Batch Extraction Process", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.11, Issue 4, page no.o58-o65, April-2024, Available :http://www.jetir.org/papers/JETIR2404F10.pdf

"Leaching Behaviour of Elements From Coal Fly Ash Using Continuous and Batch Extraction Process", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.11, Issue 4, page no. ppo58-o65, April-2024, Available at : http://www.jetir.org/papers/JETIR2404F10.pdf