Possibilities for Acid Mine Drainage Co-treatment with Other Waste Streams: A Review

Makhathini, Thobeka Pearl; Mulopo, Jean; Bakare, Babatunde Femi

doi:10.1007/s10230-020-00659-w

Cited by 9 publications

(14 citation statements)

References 81 publications

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“…In any case, wetland macrophytes show high organic pollutant assimilation and removal capacities that may additionally improve mine water quality (Tanner 1996). Synergetic cotreatment of mine-and wastewater in constructed wetlands is also increasingly tested worldwide (Makhathini et al 2020).…”

Section: Ancillary and Secondary Benefitsmentioning

confidence: 99%

The Role of Macrophytes in Constructed Surface-flow Wetlands for Mine Water Treatment: A Review

Opitz

Alte²,

Bauer³

et al. 2021

Mine Water Environ

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Constructed wetlands are a standard sustainable technology in waste and mine water treatment. Whereas macrophytes actively contribute to decomposition and/or removal of wastewater’s organic pollutants, removal of hydrolysable metals from mine water is not attributable to direct metabolic, but rather various indirect macrophyte-related mechanisms. These mechanisms result in higher treatment efficiency of (vegetated) wetlands relative to (unvegetated) settling ponds. Contribution of macrophytes to treatment predominantly includes: enhanced biogeochemical oxidation and precipitation of hydrolysable metals due to catalytic reactions and bacterial activity, particularly on immersed macrophyte surfaces; physical filtration of suspended hydrous ferric oxides by dense wetland vegetation down to colloids that are unlikely to gravitationally settle efficiently; scavenging and heteroaggregation of dissolved and colloidal iron, respectively, by plant-derived natural organic matter; and improved hydrodynamics and hydraulic efficiency, considerably augmenting retention and exposure time. The review shows that constructed surface-flow wetlands have considerable advantages that are often underestimated. In addition to treatment enhancement, there are socio-environmental benefits such as aesthetic appearance, biotope/habitat value, and landscape diversity that need to be considered. However, there is currently no quantitative, transferrable approach to adequately describe the effect and magnitude of macrophyte-related benefits on mine water amelioration, let alone clearly assign optimal operational deployment of either settling ponds or wetlands. A better (quantitative) understanding of underlying processes and kinetics is needed to optimise assembly and sizing of settling ponds and wetlands in composite passive mine water treatment systems.

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Section: Ancillary and Secondary Benefitsmentioning

confidence: 99%

The Role of Macrophytes in Constructed Surface-flow Wetlands for Mine Water Treatment: A Review

Opitz

Alte²,

Bauer³

et al. 2021

Mine Water Environ

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“…For these studies, MWW worked on the premise of carbon substrate bacterial oxidation and pathogen removal, where it requires electron acceptors [27]. Considering the high COD concentration and nutrients in HWW compared to MWW (Table 1), it is likely that it could produce a high level of sulfate reduction through a passive co-treatment of the two waste streams [28]. As such, the availability of nutrients and electron donors from HWW could be used to strip off bacterial oxygen, sulfate, and metal concentration reduction, thus producing alkalinity, similar to studies of MWW [7,22] [29].…”

Section: Introductionmentioning

confidence: 99%

“…For a 1000 m 3 /day mining effluent with 2000 mg/l SO 4 2− , an estimated spend on ethanol is 131, 400 USD. The co-treatment method of two streams of wastewater has a limitation over the expense of delivering one of the streams to a central treatment site [28]. In most cases, mine water typically forms a long distance from the location of hospitals, and pumping costs can significantly reduce the investment from the co-treatment system.…”

Section: Introductionmentioning

confidence: 99%

Effective biotreatment of acidic mine water and hospital wastewater using fluidized-bed reactors

Makhathini

Mulopo

Bakare

2020

Journal of Water Process Engineering

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“…(6) (7) where k 1 is the pseudo-first-order kinetic adsorption rate constant, min -1 ; t is the adsorption time, min; and k 2 is the pseudo-second-order kinetic adsorption rate constant, g/mg/min.…”

Section: T-45°c T-35°c T-25°cmentioning

confidence: 99%

Removal Characteristics and Mechanism of Mn(II) from Acidic Wastewater Using Red Mud-Loess Mixture

Lu¹,

Liu²,

Yu³

et al. 2022

Pol. J. Environ. Stud.

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In this study, the feasibility of using red mud (RM)-loess (L) mixture (RM-L) to treat acidic wastewater (AW) containing Mn(II) was investigated through batch experiments. The optimum mass ratio of RM to L was obtained by exploring the treatment performance of varied mass ratios of RM to L on AW under different initial pH values. Furthermore, the effects of dosage, contact time, and initial concentration on the treatment of AW with RM-L under optimum mass ratio were explored. The removal mechanism of Mn(II) was clarified using adsorption mathematical models combined with characterization. The results indicate that the optimum mass ratio of RM to L was 7:3. The addition of L promotes the equilibrium adsorption for Mn(II) on RM-L under optimum mass ratio (RM-L (7:3)) and improves the dispersibility of RM-L (7:3). Moreover, hydroxyl, carbonate, and metal-oxygen groups in RM-L (7:3) play an important role in the removal of Mn(II) and the increase in pH value to 8.4 from 3. The adsorption type of Mn(II) is monolayer adsorption, and the adsorption process of Mn(II) is spontaneous and dominated by chemical adsorption.

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Possibilities for Acid Mine Drainage Co-treatment with Other Waste Streams: A Review

Cited by 9 publications

References 81 publications

The Role of Macrophytes in Constructed Surface-flow Wetlands for Mine Water Treatment: A Review

The Role of Macrophytes in Constructed Surface-flow Wetlands for Mine Water Treatment: A Review

Effective biotreatment of acidic mine water and hospital wastewater using fluidized-bed reactors

Removal Characteristics and Mechanism of Mn(II) from Acidic Wastewater Using Red Mud-Loess Mixture

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