Utilization of ash from municipal solid waste combustion

Jones, Charles; Hahn, J.; Magee, Brian; Yuen, Nga-yee.; Sandefur, K.; Tom, Joan Bradshaw; Yap, Cheng‐Hon

doi:10.2172/757056

Cited by 2 publications

(1 citation statement)

References 3 publications

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“…3,9 Therefore, mobility data at acidic (pH 2.88) and Bulk particles are efficiently collected in PCDs and are then usually disposed of in landfills or used in byproducts, such as road asphalt or sheetrock. 3,17,53,54 When bulk ash is deposited in a landfill, rainwater may percolate through the ash pile and the pH of the water can change substantially depending upon the pH of the ash. Only a small portion of TEs present on the surface of bulk particles is generally mobile; most of the TEs in bulk particles are fused within the refrozen solid spheres that characterize this size fraction and are inaccessible.…”

Section: ■ Introductionmentioning

confidence: 99%

Mobility of Semi-volatile Trace Elements from the Fly Ash Generated by the Combustion of a Sub-bituminous Coal—The Effects of the Combustion Temperature

et al. 2020

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The effect of the combustion temperature on the mobility of three semi-volatile trace elements (TEs), arsenic, selenium, and antimony, from the fly ash generated from the combustion of a pulverized sub-bituminous coal was assessed using a modified toxicity characteristic leaching procedure protocol. Multiple sets of size-segregated fly ash samples were collected from the combustion of a Powder River Basin sub-bituminous coal in a laboratory-scale self-sustaining combustor at peak combustion temperatures of 1623, 1673, and 1723 K. TEs were extracted from representative ash samples from each particle size mode (submicron, fine fragment, and bulk) in acidic (pH 2.88), neutral (pH 7), and basic (pH 11) solvents. TE concentrations in each solvent were compared to the concentrations from complete digestion to determine fly ash TE mobility under various conditions. It was observed that an increase in the peak combustion temperature increased the distribution of minor elements and TEs in the smaller size modes but had no significant effect on TE mobility for a given size mode under a particular leaching fluid. For all three TEs, solubility decreased with increasing pH for most size modes. In a majority of cases, the fraction present in the smaller sized submicron and fine fragment particles was found to be more leachable compared to the larger bulk particles.

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