Arsenic encapsulation using Portland cement with ferrous sulfate/lime and Terra-Bond™ technologies - Microcharacterization and leaching studies

The Science of the Total Environment
Paul M Randall

Abstract

This work reports the results of an investigation on the treatment and encapsulation of arsenic-containing materials by Portland cement with ferrous sulfate and lime (PFL) and Terra-Bond™, a commercially available patented technology. The arsenic materials included: chromated copper arsenate (CCA)-treated wood materials; scorodite-rich mine tailings from the La Trinidad Mine in California; and a soil/smelter dust mixture from the Anaconda Superfund site spiked with monosodium methyl arsenate (MSMA) to simulate an organoarsenic soil material. SEM/EDS and XRD spectra of PFL treated samples showed similarity across all three waste materials while Terra-Bond treated samples showed predominance of elemental sulfur. SEM/EDS of PFL treated samples showed that calcium was imbedded in the structure while micrographs of Terra-Bond treated samples showed the appearance of an epoxy material on the surface. The epoxy material appears to be responsible for encapsulating and reducing the leachability of arsenic. XANES spectra for the PFL treatment of CCA-containing samples showed that arsenic has a predominant pentavalent form (As +5), and the PFL treatment process did not alter the arsenic oxidation state. But, distinct differences were obse...Continue Reading

References

Jan 25, 2003·Environmental Science & Technology·Ju-Yong KimKyoung-Woong Kim
Aug 25, 2004·The Science of the Total Environment·Deok Hyun MoonNektaria Menounou
Oct 28, 2004·Environmental Science & Technology·Peter S NicoMichael V Ruby
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Citations

Oct 8, 2017·Environmental Science and Pollution Research International·Jiang-Shan LiChi Sun Poon
Aug 11, 2020·Environmental Science and Pollution Research International·Md Jamal Uddin, Yeon-Koo Jeong
Nov 21, 2020·Journal of Nanoscience and Nanotechnology·Changsheng YueYanshan Cui

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