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Title: Leaching kinetics of As, Mo, and Se from acidic coal fly ash samples

Annually, coal-fired electric power plants produce large volumes potentially hazardous coal combustion products (CCPs) including fly ash. Since majority of the coal fly ash and other CCPs deposited in dry land fills or wet lagoons, they pose risk of contamination to local environment and hydrogeology. In this study, we present results of leaching kinetics for As, Mo, and Se from three acidic fly ash samples. This study shows that the leachate concentrations of As, Mo, and Se increase over time. Three kinetics equations, pseudo-second order, Elovich, and power-function, are able to adequately describe the experimental leaching kinetics data. Experimental leaching data and modeling results indicate that the rate limiting leaching of As, Mo, and Se is largely controlled by the dissolution of the fly ash particles. Furthermore, it is important to adopt effective containment/treatment schemes to avoid potential and persistent dispersion of trace elements from ash disposal facilities to surrounding environment for a long time.
Authors:
 [1] ;  [2] ;  [2] ;  [3]
  1. Idaho National Lab. (INL), Idaho Falls, ID (United States); Center for Advanced Energy Studies, Idaho Falls, ID (United States)
  2. Univ. of Alabama, Tuscaloosa, AL (United States)
  3. Univ. of Arizona, Tucson, AZ (United States)
Publication Date:
Report Number(s):
INL/JOU-15-37424
Journal ID: ISSN 1945-3094
Grant/Contract Number:
AC07-05ID14517
Type:
Accepted Manuscript
Journal Name:
Journal of Water Resource and Protection
Additional Journal Information:
Journal Volume: 09; Journal Issue: 08; Journal ID: ISSN 1945-3094
Publisher:
Scientific Research Publishing, Inc.
Research Org:
Idaho National Lab. (INL), Idaho Falls, ID (United States)
Sponsoring Org:
USDOE Office of Nuclear Energy (NE)
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; coal fly ash; arsenic; molybdenum; selenium; kinetics; leaching
OSTI Identifier:
1372791