Accumulation and Fate of Contaminants (Zn, Pb, Fe and S) in Substrates of Wetlands Constructed for Treating Mine Wastewater (original) (raw)
2000, Water, Air, & Soil Pollution
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Removal of Heavy Metals from Synthetic Mine Drainage in Laboratory Scale Constructed Wetlands
Springer Singapore, 2021
The most toxic pollutants in mine drainage are heavy metals. The JOGMEC Company is using a wastewater treatment plant which is highly expensive to maintain. As for that reason they have thought of using constructed wetland method for the removal of heavy metals from mine drainage. For this project, they have asked KANSO CO. LTD. along with Prof. Satoshi Soda and his team to conduct initial survey, which includes laboratory-scale analysis for removal of heavy metals. Synthetic mine drainage in laboratory-scale is to be treated using constructed wetland in a sequence batch to assess heavy metal removal efficiencies. In this project, two sets of laboratory-scale constructed wetlands are prepared and feed with synthesized mine drainage water and checked for the efficiency of heavy metal removal from the mine water. This project's main intention is to obtain effective and higher efficiency for removal of heavy metals and then to compare the efficiencies of the planted and unplanted construction wetlands. Keywords Constructed wetlands (CWs) • Synthetic mine drainage • Heavy metals 1 Introduction In the metal mine, after the closure, mine drainage containing heavy metals will leak out, causing damage to residents and agricultural crops and wild lives. If the water quality does not improve, even after taking countermeasures, despite the lack
2021
In this study, the treatment of acid mine drainage (AMD) using vertically flowing wetland was explored. The wetland was enriched with Vetiveria zizanioides as a decontaminating media and soil as the substrate. Water was percolated through the substrate and the throughput samples were collected and characterized every five days for a period of 30 days. The obtained results revealed a tolerant index of 1.03 for Vetiveria zizanioides, and a net reduction of metals and sulfate. The removal efficacy of chemical species was observed to obey the following order: Fe (71.25%) > Zn (70.40%) > Mn (62%) > Al (56.68%)> SO42− (55.18%) > Ni (35%) > Cu (18.83%). The removal of chemical species was further aided by the used substrate, and this could be attributed to the accumulation of chemical species on the soil through precipitation, adsorption, and phyto-retention. As such, it could be deduced that the substrate plays a significant role in the removal of metals, while the grass...
Environmental contamination related to mine drainage distribution from old mine sites by waterways
The most common environmental concern associated with acid mine drainage (AMD) is related to water contamination downgradient from mine sites, which may be particularly damaging in areas where receiving waters have a low buffering capacity. However in a wet climate metal contamination is significantly more severe in soil, where metal compounds are delivered and deposited by means of water, and river sediments. Contamination of natural water receiving mine drainage and its effect on sediment and soils were investigated in the vicinity of the Silvermines Pb-Zn Abandoned Mine Site (AMS). Within the area of carbonate rocks occurrence, contamination of surface water was detected mainly within the immediate vicinity of the mine site and was found to rapidly fade downgradient from the AMS. Resultant Pb/Zn/Cd contamination of river/stream sediments and soil at some locations was significant: metal concentrations in soil within river floodplains are comparable with those at mine sites; exces...
Review of Constructed Wetlands for Acid Mine Drainage Treatment
Water
The mining industry is the major producer of acid mine drainage (AMD). The problem of AMD concerns at active and abandoned mine sites. Acid mine drainage needs to be treated since it can contaminate surface water. Constructed wetlands (CW), a passive treatment technology, combines naturally-occurring biogeochemical, geochemical, and physical processes. This technology can be used for the long-term remediation of AMD. The challenge is to overcome some factors, for instance, chemical characteristics of AMD such a high acidity and toxic metals concentrations, to achieve efficient CW systems. Design criteria, conformational arrangements, and careful selection of each component must be considered to achieve the treatment. The main objective of this review is to summarize the current advances, applications, and the prevalent difficulties and opportunities to apply the CW technology for AMD treatment. According to the cited literature, sub-surface CW (SS-CW) systems are suggested for an ef...
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