Employment of Ca2+-rich MgO nanoparticles for effective treatment of real acid mine drainage

• Autorzy: Mothetha Matome , Kebede Kefeni , Masindi Vhahangwele , Msagati Titus

Identyfikatory

DOI

10.37190/epe230102

• Języki publikacji: EN

Abstrakty

EN

The efficacy of Ca²⁺-rich MgO nanoparticles for the effective treatment of real acid mine drainage (AMD) was evaluated. The optimized parameters include the feedstock dosage and contact time. The experimental results were underpinned using state-of-the-art analytical techniques and instruments such as FTIR, HR-FIB/SEM, EDS, XRF, and XRD. The pH REDOX equilibrium (in C language) (PHREEQC) model was also employed to complement experimental results. Optimum conditions were observed to be 45–60 min of mixing time, ≥10 000 mg/dm³ of feedstock dosage, i.e., Ca²⁺-rich MgO nanoparticles, and ambient temperature and pH. The metal content (Fe³⁺, Mn²⁺, Cr²⁺, Cu²⁺, Ni²⁺, Pb²⁺, Al³⁺, and Zn²⁺) embedded in AMD matrices was practically removed (≥99% removal efficacies) whilst the sulfate was also attenuated humongous (≥40%). The PHREEQC predicted metals to exist as multi-valent including carbonates and other chemical complexes. Chemical species in real AMD were predicted to precipitate as metals hydroxides, (oxy)-hydroxides, carbonates, and (oxy)-hydro-sulfates. Henceforth, the use of Ca²⁺-rich MgO nanoparticles was proved to be effective in the treatment of AMD from coal mining activities. However, a polishing technology will be required to further remove residual sulfates. This could be pursued to recover sulfate in valuable form and then reclaim drinking water for domestic purposes or other defined uses (end-use). This will then be the most effective closed-loop approach in the management of AMD under the circular economy (CE) concept.

Słowa kluczowe

EN

dewatering of mine; acid mine waters; acid mine drainage; AMD; PHREEQC

PL

odwadnianie kopalni; kwaśne wody kopalniane; AMD; PHREEQC

• Wydawca: Oficyna Wydawnicza Politechniki Wrocławskiej
• Czasopismo: Environment Protection Engineering
• Rocznik: 2023
• Tom: Vol. 49, nr 1
• Strony: 25--44
• Opis fizyczny: Bibliogr. 26 poz., rys., tab.

Twórcy

autor

Mothetha Matome

• Department of Environmental Sciences, College of Agriculture and Environmental Sciences, University of South Africa (UNISA), P.O. Box 392, Florida, 1710, South Africa
• Research and Committees Unit, Legislature Department, City of Ekurhuleni, Private Bag X1069, Germiston 1400, South Africa

autor

Kebede Kefeni

• Institute of Nanotechnology and Water Sustainability, College of Science, Engineering and Technology, University of South Africa, Private Bag X6, Florida 1710, South Africa

autor

Masindi Vhahangwele

• Department of Environmental Sciences, College of Agriculture and Environmental Sciences, University of South Africa (UNISA), P.O. Box 392, Florida, 1710, South Africa
• Magalies Water, Scientific Services, Research and Development Division, Erf 3475, Stoffberg Street, Brits 0250, South Africa

autor

Msagati Titus

• Institute of Nanotechnology and Water Sustainability, College of Science, Engineering and Technology, University of South Africa, Private Bag X6, Florida 1710, South Africa

Bibliografia

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Uwagi

Opracowanie rekordu ze środków MEiN, umowa nr SONP/SP/546092/2022 w ramach programu "Społeczna odpowiedzialność nauki" - moduł: Popularyzacja nauki i promocja sportu (2022-2023).