Assessment of cement kiln dust (CKD) for stabilization/solidification (S/S) of arsenic contaminated soils

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dc.contributor.author Moon, Deok Hyun
dc.contributor.author Wazne, Mahmoud
dc.contributor.author Yoon, In-Ho
dc.contributor.author Grubb, Dennis G.
dc.date.accessioned 2016-03-01T08:27:13Z
dc.date.available 2016-03-01T08:27:13Z
dc.date.copyright 2008
dc.date.issued 2016-03-01
dc.identifier.issn 0304-3894 en_US
dc.identifier.uri http://hdl.handle.net/10725/3224
dc.description.abstract A stabilization/solidification (S/S) process for arsenic (As) contaminated soils was evaluated using cement kiln dust (CKD). Laboratory-prepared slurries, made of either kaolinite or montmorillonite, and field soils spiked with either As3+ or As5+ were prepared and treated with CKD ranging from 10 to 25 wt%. Sodium arsenite and sodium arsenate at 0.1 wt% were used to simulate arsenite (As3+) and arsenate (As5+) source contamination in soils, respectively. The effectiveness of treatment was evaluated at curing periods of 1- and 7-days based on the toxicity characteristic leaching procedure (TCLP). As–CKD and As–clay–CKD slurries were also spiked at 10 wt% to evaluate As immobilization mechanism using X-ray powder diffraction (XRPD) analyses. Overall, the TCLP results showed that only the As5+ concentrations in kaolinite amended with 25 wt% CKD after 1 day of curing were less than the TCLP regulatory limit of 5 mg/L. Moreover, at 7 days of curing, all As3+ and As5+ concentrations obtained from kaolinite soils were less than the TCLP criteria. However, none of the CKD-amended montmorillonite samples satisfied the TCLP–As criteria at 7 days. Only field soil samples amended with 20 wt% CKD complied with the TCLP criteria within 1 day of curing, where the source contamination was As5+. XRPD and scanning electron microscopy (SEM)–energy dispersive X-ray spectroscopy (EDX) results showed that Ca–As–O and NaCaAsO4·7.5H2O were the primary phases responsible for As3+ and As5+ immobilization in the soils, respectively. en_US
dc.language.iso en en_US
dc.title Assessment of cement kiln dust (CKD) for stabilization/solidification (S/S) of arsenic contaminated soils en_US
dc.type Article en_US
dc.description.version Published en_US
dc.author.school SOE en_US
dc.author.idnumber 201205627 en_US
dc.author.woa N/A en_US
dc.author.department Civil Engineering en_US
dc.description.embargo N/A en_US
dc.relation.journal Journal of Hazardous Materials en_US
dc.journal.volume 159 en_US
dc.journal.issue 2-3 en_US
dc.article.pages 512-518 en_US
dc.keywords Arsenic (As) en_US
dc.keywords Cement kiln dust (CKD) en_US
dc.keywords Toxicity characteristic leaching procedure (TCLP) en_US
dc.keywords Scanning electron microscopy (SEM) en_US
dc.keywords Energy dispersive X-ray spectroscopy (EDX) en_US
dc.identifier.doi http://dx.doi.org/10.1016/j.jhazmat.2008.02.069 en_US
dc.identifier.ctation Moon, D. H., Wazne, M., Yoon, I. H., & Grubb, D. G. (2008). Assessment of cement kiln dust (CKD) for stabilization/solidification (S/S) of arsenic contaminated soils. Journal of hazardous materials, 159(2), 512-518. en_US
dc.author.email mahmoud.wazne@lau.edu.lb
dc.identifier.url http://www.sciencedirect.com/science/article/pii/S0304389408002811

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