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Release of selected chemical elements from shale drill cuttings to aqueous solutions of different pH
Abstract
The effect of pH changes on leachability of light and heavy metals from shale drill cuttings generated from unconventional shale gas production was investigated. Cuttings, being the primary byproduct generated from drilling operations, belong to the potentially hazardous type of wastes due to presence of heavy and radioactive elements and remains of drilling fluid. In this regard, assessment of potentially dangerous components (PDCs) from rock waste materials was performed by application of batch leaching tests, which has provided information on the sensitivity of leaching under externally imposed changes in pH (natural or caused by treatment) in specific scenarios. The description of shale rocks mineralogical and chemical properties was performed by means of X-ray fluorescence spectroscopy, diffractometry as well as scintillation spectrometry. The concentrations of released constituents due to the leaching tests were measured by atomic absorption spectrophotometry. Results were compared and discussed accordingly with the waste acceptable criteria of elution limits. Analysis of the substrate revealed that the elemental composition was dominated by light elements, whereas heavy metals were present in trace amounts. However, noticeable release of barium (2.0e4.6%) was also recorded, which has originated from not only rock material but also drill mud. Minor mobility was observed for transition elements such as Cr, Co, Fe, Mn, Ni, Zn, Cu and Pb. Results revealed that drill cuttings follow the requirements for other than hazardous and municipal type of deposition, with exception for barium. Moreover, content of radioactive isotopes fulfill the requirements range of acceptable concentrations.
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- Category:
- Articles
- Type:
- artykuł w czasopiśmie wyróżnionym w JCR
- Published in:
-
APPLIED GEOCHEMISTRY
no. 72,
pages 136 - 145,
ISSN: 0883-2927 - Language:
- English
- Publication year:
- 2016
- Bibliographic description:
- Piszcz-Karaś K., Łuczak J., Hupka J.: Release of selected chemical elements from shale drill cuttings to aqueous solutions of different pH// APPLIED GEOCHEMISTRY. -Vol. 72, (2016), s.136-145
- DOI:
- Digital Object Identifier (open in new tab) 10.1016/j.apgeochem.2016.07.006
- Verified by:
- Gdańsk University of Technology
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