Solid phase characterization and metal deportment in a mussel shell bioreactor for the treatment of AMD, Stockton Coal Mine, New Zealand

Diloreto, Zach; Weber, P.A.; Weisener, Christopher G.

doi:10.1016/j.apgeochem.2016.02.011

Cited by 13 publications

(9 citation statements)

References 87 publications

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“…Higher Zn concentrations are also a possibility, as the Whirlwind Seep serving as the source for the MSB in question was characterized by a Zn concentration of 0.26 mg L -1 (± 0.05) and an influent flow rate and residence time of 1-6 L s -1 and 0.37-2.2 days (dependent on seasonality), respectively, enough to saturate the bioreactor with high levels of metals. Furthermore, targeted extractions identified Zn as being highly associated with reducible phases at the depth of the bioreactor analyzed (DiLoreto et al, 2016a;DiLoreto et al, 2016b). Surprisingly, few cells were observed associated with ZnS phases in the raw bioreactor material, a stark contrast to observations in other work (Moreau et al, 2004).…”

Section: Scanning Electron Microscopy and Solid Phase Investigationscontrasting

confidence: 53%

“…Material from the reduced layers of the Stockton mussel shell bioreactor will provide the source of the bacterial inoculum, as this is the region where SRB species have been detected (DiLoreto et al, 2016b). It is hypothesized that enrichments from the bioreactor will harbour active SRB that will lower initial Zn and Tl concentrations in lab experiments, and that this will occur in tandem with observable precipitation of biogenic Zn-sulfide minerals, in accordance with afore mentioned research investigations.…”

Section: Introductionsupporting

confidence: 55%

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Evaluating the microbial community and gene regulation involved in crystallization kinetics of ZnS formation in reduced environments

Falk

Chaganti

Weisener

2018

Geochimica et Cosmochimica Acta

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Section: Scanning Electron Microscopy and Solid Phase Investigationscontrasting

confidence: 53%

Section: Introductionsupporting

confidence: 55%

Evaluating the microbial community and gene regulation involved in crystallization kinetics of ZnS formation in reduced environments

Falk

Chaganti

Weisener

2018

Geochimica et Cosmochimica Acta

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“…Over the past century, extensive surface and underground coal mining in the Illinois Basin and other regions of the US has left a legacy of a large number of abandoned sites, many of which produce drainages that are acidic and have high contents of S, Fe, Al, and other environmentally relevant pollutants (i.e., As, Cd, Cu, Hg, Ni, Mn, Se, Pb, and Zn) (Cravotta, C.A., 2008;Blowes et al, 2014;Lefticariu et al, 2015). Mitigating the environmental impact of acid mine drainages (AMD) is dependent on deciphering the highly complex interplays between the physical and biochemical processes associated with their mobilization, transport, sequestration, and overall long-term fate in natural and engineered systems (Küsel 2003;Gagliano et al, 2004;Burgos et al, 2012;DiLoreto et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

Impacts of detrital nano- and micro-scale particles (dNP) on contaminant dynamics in a coal mine AMD treatment system

Lefticariu

Sutton

Bender

et al. 2017

Science of The Total Environment

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Pollutants in acid mine drainage (AMD) are usually sequestered in neoformed nano- and micro-scale particles (nNP) through precipitation, co-precipitation, and sorption. Subsequent biogeochemical processes may control nNP stability and thus long-term contaminant immobilization. Mineralogical, chemical, and microbiological data collected from sediments accumulated over a six-year period in a coal-mine AMD treatment system were used to identify the pathways of contaminant dynamics. We present evidence that detrital nano- and micron-scale particles (dNP), composed mostly of clay minerals originating from the partial weathering of coal-mine waste, mediated biogeochemical processes that catalyzed AMD contaminant (1) immobilization by facilitating heterogeneous nucleation and growth of nNP in oxic zones, and (2) remobilization by promoting phase transformation and reductive dissolution of nNP in anoxic zones. We found that dNP were relatively stable under acidic conditions and estimated a dNP content of ~0.1g/L in the influent AMD. In the AMD sediments, the initial nNP precipitates were schwertmannite and poorly crystalline goethite, which transformed to well-crystallized goethite, the primary nNP repository. Subsequent reductive dissolution of nNP resulted in the remobilization of up to 98% of S and 95% of Fe accompanied by the formation of a compact dNP layer. Effective treatment of pollutants could be enhanced by better understanding the complex, dynamic role dNP play in mediating biogeochemical processes and contaminant dynamics at coal-mine impacted sites.

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“…The sludge layer has accumulated over a four-year period and has significantly impacted the performance of the existing MSB. The sediment sludge layer was found to contain gibbsite (an aluminum hydroxide), ferrierite, and have a pH of 3 [13]. The top sludge layer was removed in 2016 to increase the permeability and lifespan of the MSB.…”

Section: Introductionmentioning

confidence: 99%

Biogeochemical Characterization of Metal Behavior from Novel Mussel Shell Bioreactor Sludge Residues

Butler

Pope²,

Chaganti

et al. 2019

Geosciences

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Acid mine drainage (AMD) remediation commonly produces byproducts which must be stored or utilized to reduce the risk of further contamination. A mussel shell bioreactor has been implemented at a coal mine in New Zealand, which is an effective remediation option, although an accumulated sludge layer decreased efficiency which was then removed and requires storage. To understand associated risks related to storage or use of the AMD sludge material, a laboratory mesocosm study investigated the physio-chemical and biological influence in two conditions: anoxic storage (burial deep within a waste rock dump) or exposure to oxic environments (use of sludge on the surface of the mine). Solid phase characterization by Scanning Electron Microscopy (SEM) and selective extraction was completed to compare two environmental conditions (oxic and anoxic) under biologically active and abiotic systems (achieved by gamma irradiation). Changes in microbial community structure were monitored using 16s rDNA amplification and next-generation sequencing. The results indicate that microbes in an oxic environment increase the formation of oxyhydroxides and acidic conditions increase metal mobility. In an oxic and circumneutral environment, the AMD sludge may be repurposed to act as an oxygen barrier for mine tailings or soil amendment. Anoxic conditions would likely promote the biomineralization of sulfide minerals in the AMD sludge by sulfate reducing bacteria (SRB), which were abundant in the system. The anoxic conditions reduced the risk of trace metals (Zn) associated with oxides, but increased Fe associated with organic material. In summary, fewer risks are associated with anoxic burial but repurposing in an oxic condition may be appropriate under favorable conditions.

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Solid phase characterization and metal deportment in a mussel shell bioreactor for the treatment of AMD, Stockton Coal Mine, New Zealand

Cited by 13 publications

References 87 publications

Evaluating the microbial community and gene regulation involved in crystallization kinetics of ZnS formation in reduced environments

Evaluating the microbial community and gene regulation involved in crystallization kinetics of ZnS formation in reduced environments

Impacts of detrital nano- and micro-scale particles (dNP) on contaminant dynamics in a coal mine AMD treatment system

Biogeochemical Characterization of Metal Behavior from Novel Mussel Shell Bioreactor Sludge Residues

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