TY - JOUR
T1 - Recovery of phosphate from municipal wastewater as calcium phosphate and its subsequent application for the treatment of acid mine drainage
AU - Nepfumbada, Collen
AU - Tavengwa, Nikita Tawanda
AU - Masindi, Vhahangwele
AU - Foteinis, Spyros
AU - Chatzisymeon, Efthalia
N1 - Funding Information:
The authors of this manuscript would like to convey their sincere and profound gratitude to the University of South Africa, the University of Venda, Council for Scientific and Industrial Research, University of Pretoria, and Magalies Water for extending their facilities and funding towards the accomplishment of this project. The mining houses and municipal wastewater facilities who granted researchers in this study permission to collect the effluents are also acknowledged.
Funding Information:
The authors of this manuscript would like to convey their sincere and profound gratitude to the University of South Africa , the University of Venda , Council for Scientific and Industrial Research , University of Pretoria , and Magalies Water for extending their facilities and funding towards the accomplishment of this project. The mining houses and municipal wastewater facilities who granted researchers in this study permission to collect the effluents are also acknowledged.
Publisher Copyright:
© 2022 Elsevier B.V.
PY - 2023/3
Y1 - 2023/3
N2 - Here, the co-managment of municipal wastewater (MWW) and acid mine drainage (AMD) is proposed, where the recovered low-value phosphorus from MWW is used for the treatment of AMD. Specifically, MWW was treated using calcium hydroxide (Ca(OH)2), a low-cost and readily available material, with the ammonia content being greatly reduced (89%) through stripping and phosphates practically eliminated (>99%). The recovered low-value phosphorus material, in the form of calcium phosphate (Ca3(PO4)2), was then used for the treatment of AMD from coal mining. Metals contained in AMD scavenged phosphorous, forming new minerals, and the increased alkalinity led to their precipitation. The optimum treatment conditions were 90 min contact time, 10 g L−1 Ca3(PO4)2 dosage, and room temperature and ambient pH. Under these conditions, AMD's metal content (Fe, Mn, Cr, Cu, Ni, Pb, Al, and Zn) was practically depleted (>99% removal) and sulphate (SO4) greatly reduced (90.6%). Results were underpinned by FTIR, FIB/SEM, EDS/SEM, XRF, and XRD. Overall, this indirect co-treatment method holds great promise for the sustainable management of both wastewater matrices and can provide a simple and effective solution for their co-management, particularly in the developing world context where it could also help in advancing the UN's sustainable development goals.
AB - Here, the co-managment of municipal wastewater (MWW) and acid mine drainage (AMD) is proposed, where the recovered low-value phosphorus from MWW is used for the treatment of AMD. Specifically, MWW was treated using calcium hydroxide (Ca(OH)2), a low-cost and readily available material, with the ammonia content being greatly reduced (89%) through stripping and phosphates practically eliminated (>99%). The recovered low-value phosphorus material, in the form of calcium phosphate (Ca3(PO4)2), was then used for the treatment of AMD from coal mining. Metals contained in AMD scavenged phosphorous, forming new minerals, and the increased alkalinity led to their precipitation. The optimum treatment conditions were 90 min contact time, 10 g L−1 Ca3(PO4)2 dosage, and room temperature and ambient pH. Under these conditions, AMD's metal content (Fe, Mn, Cr, Cu, Ni, Pb, Al, and Zn) was practically depleted (>99% removal) and sulphate (SO4) greatly reduced (90.6%). Results were underpinned by FTIR, FIB/SEM, EDS/SEM, XRF, and XRD. Overall, this indirect co-treatment method holds great promise for the sustainable management of both wastewater matrices and can provide a simple and effective solution for their co-management, particularly in the developing world context where it could also help in advancing the UN's sustainable development goals.
KW - Acid and metalliferous drainage (AMD) and acid rock drainage (ARD)
KW - Sustainable wastewater management
KW - Water reclamation
KW - Wastewater valorisation
KW - Minerals synthesis and recovery
KW - Zero liquid discharge (ZLD) and circular economy
UR - http://www.scopus.com/inward/record.url?scp=85145591884&partnerID=8YFLogxK
U2 - 10.1016/j.resconrec.2022.106779
DO - 10.1016/j.resconrec.2022.106779
M3 - Article
SN - 0921-3449
VL - 190
JO - Resources, Conservation and Recycling
JF - Resources, Conservation and Recycling
M1 - 106779
ER -
