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Article

Pilot-Scale Removal of Arsenic and Heavy Metals from Mining Wastewater Using Adsorption Combined with Constructed Wetland

1
VNU University of Science, Vietnam National University, 334 Nguyen Trai, Ha Noi 10053, Vietnam
2
Vietnam Japan University, Vietnam National University, Luu Huu Phuoc, Hanoi 10053, Vietnam
3
Institute of Environmental Technology, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet, Ha Noi 10072, Vietnam
4
International Environmental Research Institute (IERI) and Gwangju Institute of Science & Technology (GIST), Gwangju 61005, Korea
*
Author to whom correspondence should be addressed.
Minerals 2019, 9(6), 379; https://doi.org/10.3390/min9060379
Received: 14 May 2019 / Revised: 12 June 2019 / Accepted: 20 June 2019 / Published: 23 June 2019
(This article belongs to the Special Issue Arsenic Geochemistry and Health)
This study was conducted to assess the removal of arsenic (As) and heavy metals from mining wastewater by the combination of adsorption, using modified iron-ore drainage sludge, and horizontal-subsurface-flow constructed wetland with common reed (Phragmites australis). The pilot-scale experiment with a constant flow rate of 5 m3/day was operated for four months using real wastewater from a Pb–Zn mine in northern Vietnam. Atomic absorption spectroscopy was used for elemental analysis in wastewater and plant. X-ray diffraction (XRD), surface charge measurements (by a particle charge detector (PCD)), Fourier-transform infrared (FTIR), and surface area Brunauer–Emmet–Teller (BET) measurements were performed to determine the characteristics of the adsorbent. The results showed that the average removals of As, Mn, Cd, Zn, and Pb by the combined system with limestone substrate during four months were 80.3%, 96.9%, 79.6%, 52.9%, and 38.7%, respectively. The use of another constructed wetland substrate, laterite, demonstrated better removal efficiency of As than limestone. The concentrations of As and heavy metals in the effluent were lower than the limits established by the QCVN 40:2011/BTNMT for industrial wastewater, which indicated the feasibility of combining adsorption and constructed wetland for the treatment of mining wastewater. View Full-Text
Keywords: adsorbent; arsenic; constructed wetland; heavy metal; mining wastewater; removal adsorbent; arsenic; constructed wetland; heavy metal; mining wastewater; removal
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MDPI and ACS Style

Nguyen, H.T.H.; Nguyen, B.Q.; Duong, T.T.; Bui, A.T.K.; Nguyen, H.T.A.; Cao, H.T.; Mai, N.T.; Nguyen, K.M.; Pham, T.T.; Kim, K.-W. Pilot-Scale Removal of Arsenic and Heavy Metals from Mining Wastewater Using Adsorption Combined with Constructed Wetland. Minerals 2019, 9, 379. https://doi.org/10.3390/min9060379

AMA Style

Nguyen HTH, Nguyen BQ, Duong TT, Bui ATK, Nguyen HTA, Cao HT, Mai NT, Nguyen KM, Pham TT, Kim K-W. Pilot-Scale Removal of Arsenic and Heavy Metals from Mining Wastewater Using Adsorption Combined with Constructed Wetland. Minerals. 2019; 9(6):379. https://doi.org/10.3390/min9060379

Chicago/Turabian Style

Nguyen, Ha T.H.; Nguyen, Bien Q.; Duong, Thuy T.; Bui, Anh T.K.; Nguyen, Hang T.A.; Cao, Ha T.; Mai, Nhuan T.; Nguyen, Khai M.; Pham, Thuy T.; Kim, Kyoung-Woong. 2019. "Pilot-Scale Removal of Arsenic and Heavy Metals from Mining Wastewater Using Adsorption Combined with Constructed Wetland" Minerals 9, no. 6: 379. https://doi.org/10.3390/min9060379

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