APPLICATION OF TECHNICAL STONE WASTE IN PHOSPHATE, ARSENATE AND CHROMATE REMOVAL FROM CONTAMINATED WATER

Dousova, B.; Lhotka, M.; Reiterman, P.; Bedrnova, E.; Mastny, L.
Abstract:
Powdered waste sludge from the production of technical stone (TSW), produced by theTechniStone® Company (Hradec Kralove, Czech Republic), was surface modified withFe2+ and Mn2+ inorganic salts and then testified as a potential adsorbent ofenvironmentally important oxyanions (phosphate PO43-, arsenate AsO43- and chromateCrO42-) from contaminated waters. The surface modification in principle consisted increating a thin layer of hydrated Fe/Mn ions in reactive form on the TSW surface.Thanks to the change of the surface charge (pHZPC), the newly formed Fe/Mn activesurface sites were then appropriate for a selective anion adsorption. The batchadsorption experiments were performed with 0.3 mmol.L-1 model solutions of PO43-,AsO43- and CrO42- and the sorbent (TSW, TSWFe and TSWMn) fraction of ?0.1 mm, atthe laboratory temperature (20 °C). The obtained data were fitted by the Langmuirmodel. The adsorption of oxyanions on the original TSW was completely ineffective,with the yield of ?2% for AsO43- and a maximum of 8% for CrO42-. Even the negativegradient of PO43- adsorption on TSW was related to the simultaneous leaching of PO43-primarily contained in the original material. The Fe or Mn surface modificationincreased the adsorption efficiency to >99% for the PO43- adsorption, to 99% for theAsO43- adsorption, and to 82–86% for CrO42- adsorption. While the use of TSWFeindicated the highest adsorption capacity and yield for all tested oxyanions, theLangmuir parameters revealed the adsorption on TSWMn as more robust, with orders ofmagnitude higher adsorption constants (KL) and a lower Gibbs energy consumption(?G). The selectivity of the oxyanion adsorption to TSWFe and TSWMn decreased in theorder: PO43- > AsO43- > CrO42-.
SGEM Research areas:
Year:
2021
Type of Publication:
In Proceedings
Keywords:
technical stone waste; surface modification; adsorption; toxic oxyanions
Editor:
• Prof. DSc. Oleksandr Trofymchuk, UKRAINE • Prof. Dr. hab. oec. Baiba Rivza, LATVIA
Volume:
21
SGEM Book title:
21st International Multidisciplinary Scientific GeoConference SGEM 2021
Book number:
4.2
SGEM Series:
SGEM International Multidisciplinary Scientific GeoConference
Pages:
15-22
Publisher address:
51 Al. Malinov blvd, Sofia, 1712, Bulgaria
SGEM supporters:
SWS Scholarly Society; Acad Sci Czech Republ; Latvian Acad Sci; Polish Acad Sci; Serbian Acad Sci & Arts; Natl Acad Sci Ukraine; Natl Acad Sci Armenia; Sci Council Japan; European Acad Sci, Arts & Letters; Acad Fine Arts Zagreb Croatia; Croatian Acad Sci
Period:
7 - 10 December, 2021
ISBN:
978-619-7603-34-7
ISSN:
1314-2704
Conference:
21st International Multidisciplinary Scientific GeoConference SGEM 2021, 7 - 10 December, 2021
DOI:
10.5593/sgem2021V/4.2/s18.03
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