HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Abstract Full Text Free Full Text (PDF) Free Alert me when this article is cited Alert me if a correction is posted Services Similar articles in this journal Similar articles in PubMed Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via Google Scholar Google Scholar Articles by Wang, T. Articles by Ladwig, K. Search for Related Content PubMed PubMed Citation Articles by Wang, T. Articles by Ladwig, K. Agricola Articles by Wang, T. Articles by Ladwig, K. Related Collections Industrial Wastes Toxic Trace Metals Heavy Metals

The Leaching Characteristics of Selenium from Coal Fly Ashes

^a Dep. of Civil, Architectural & Environmental Engineering, Univ. of Missouri, Rolla, MO 65409
^b Dep. of Mechanical & Aerospace Engineering, Utah State Univ., Logan, UT 84322
^c Electric Power Research Inst. (EPRI), 3420 Hillview Ave., Palo Alto, CA 94304

View larger version (9K): [in this window] [in a new window]   Fig. 1. Selenium leaching from bituminous and subbituminous coal fly ashes. Experimental conditions: S/L = 1:10; temperature = 20–25°C; equilibration time = 24 h.

View larger version (10K): [in this window] [in a new window]   Fig. 2. Soluble selenium concentrations as a function of pH under different selenium addition conditions for 0.2 mol/L NaOH washed ash #1004: (a) Se(VI) and (b) Se(IV). Experimental conditions: S/L = 1:10; ionic strength = 0.01 mol/L NaNO3; temperature = 20–25°C; equilibration time = 24 h.

View larger version (14K): [in this window] [in a new window]   Fig. 3. Selenium adsorption results in single and mixed species systems for different types of ashes: (a) 0.2 mol/L NaOH washed bituminous coal ash # 1009; and (b) DI water washed subbituminous coal ash #1018. Experimental conditions were same as Fig. 2.

View larger version (16K): [in this window] [in a new window]   Fig. 4. Sulfate impact on selenium adsorption for different types of ashes: (a) 0.2 mol/L NaOH washed bituminous coal ash # 1009; and (b) DI water washed subbituminous coal ash #1018. Experimental conditions were same as Fig. 2.

View larger version (7K): [in this window] [in a new window]   Fig. 5. Titration and curve fitting results for (a) 0.2 mol/L NaOH washed ash #1004 and (b) DI water washed ash #1008. Experimental conditions: S/L = 1:10; ionic strength = 0.01 mol/L (NaNO3); temperature = 20–25°C; equilibration time = 24 h.

View larger version (8K): [in this window] [in a new window]   Fig. 6. Se(IV) partitioning results–experimental data and modeling result for (a) 0.2 mol/L NaOH washed ash #1004 and (b) DI water washed ash #1008. Experimental conditions were same as Fig. 2.