AMD Treatment in New Zealand – Use of Small-scale Passive Systems

Trumm, D.; Watts, M.; Gunn, Peter

doi:10.21000/jasmr06022142

Cited by 2 publications

(2 citation statements)

References 12 publications

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“…10/20/05 10/30/05 11/9/05 11/19/05 11/29/05 12/9/05 systems were constructed: an oLC, a RAPS, and a limestone leaching bed (LLB). The oLC and RAPS were designed based on previous successes with small-scale systems (Trumm et al , 2006. The LLB was based on a design by Hellier (2000) for a similar system in the eastern uSA.…”

Section: Methodsmentioning

confidence: 99%

Using pilot trials to test geochemical treatment of acid mine drainage on Stockton Plateau

Trumm¹,

Watts²,

Pope³

et al. 2008

New Zealand Journal of Geology and Geophysics

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Herbert Stream, a tributary of the Waimangaroa River on the Stockton Plateau, South Island, New Zealand, has elevated metal concentrations (Al 7.68 ppm, Fe 1.37 ppm, Mn 0.69 ppm, and Zn 0.12 ppm) and low pH (2.3-3.4) characteristic of acid mine drainage. Average flow rate is 5.3 L/s. To determine the effectiveness of different geochemical treatment strategies, small-scale trials consisting of a reducing and alkalinity producing system (RAPS), a limestone leaching bed (LLB), and an open limestone channel (OLC) were operated for 8 months. All three trial systems performed well, removing metals and raising pH. Maximum removal rates were: Al 99% (all three systems); Fe 97% (RAPS), 99% (LLB), and 95% (OLC); Mn 95% (RAPS), 92% (LLB), and 74% (OLC); and Zn 87% (RAPS) and 91% (LLB). The OLC was less effective than the other trial systems in raising pH, and the effectiveness of Al removal decreased with time, probably due to armouring of the limestone by hydroxide precipitates. Minimal armouring of the limestone in the RAPS and LLB occurred, and the RAPS was successful at reducing oxidised Fe to Fe monosulfides (most likely mackinawite). Based on monitoring of the trial AMD treatment systems, a full-scale LLB was designed to treat the entire flow of Herbert Stream.

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Section: Methodsmentioning

confidence: 99%

Using pilot trials to test geochemical treatment of acid mine drainage on Stockton Plateau

Trumm¹,

Watts²,

Pope³

et al. 2008

New Zealand Journal of Geology and Geophysics

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“…O'Sullivan (2005) summarized AMD chemistry and potential passive-treatment options viable in New Zealand. Trumm et al (2005 and (Trumm et al, 2006). Removal efficiencies by day 58 of this system with an average hydraulic residence time of 20 hours were 100% acidity, 99% Fe, 96% Al, 95% Ni and 99% Zn.…”

Section: Passive Treatment and Sulfate Reductionmentioning

confidence: 74%

Performance of Mesocosm-Scale Sulfate-Reducing Bioreactors for Treating Acid Mine Drainage in New Zealand

McCauley¹,

O’Sullivan²,

Weber³

et al. 2008

JASMR

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Water chemistry was monitored monthly for ten months from an acid mine drainage (AMD) seep emanating at Stockton Coal Mine within the Mangatini watershed in New Zealand. Metal concentrations of the seep water were Fe (4.31-146 mg/L), Al (7.43-76.7 mg/L), Cu (0.0201-0.0669 mg/L), Ni (0.0629-0.261 mg/L), Zn (0.380-1.39 mg/L), Cd (0.000540-0.00134 mg/L) and Pb (0.0049-0.0056 mg/L), pH was 2.49-3.34 and total acidity (pH 8.3) was 78.5-626 mg/L as CaCO 3. Water chemistry signature prompted laboratory mesocosm studies measuring the effectiveness of sulfate-reducing bioreactors (SRBRs) for generating alkalinity and sequestering metals. Alkaline materials utilized in the SRBRs included industrial waste products such as mussel shells, nodulated stack dust (NSD) derived from the cement industry, and limestone. Organic substrate materials included post peel, a by-product from fence post manufacture, Pinus radiata bark and compost. Seven SRBRs comprised of varying substrate mixes received aerated AMD for nearly four months. AMD was sourced from the pond that collected the seep water. The SRBR containing NSD successfully removed all metals, but effluent was caustic with pH>9. Bioreactors consisting of 20-30% mussel shells were most successful at immobilizing metals and generating circumneutral effluent. Systems containing mussel shells sequestered more than 0.8 moles of metals/m 3 of substrate/day at stable operating conditions and yielded effluent concentrations (removal efficiencies) of 0.120-3.46 mg/L Fe (96.5-99.8%), 0.0170-0.277 mg/L Al (99.5-99.9%), <0.0005-<0.001 mg/L Cu (>99.7->99.9%), <0.0005-0.0020 mg/L Ni (99.3->99.7%), <0.001-0.005 mg/L Zn (99.7-99.9%), < 0.00005 Cd (>98.3->98.9%) and <0.0001-0.0001 Pb (99.5-<99.7%). The system consisting of limestone as the only alkalinity generating material was less effective (15.4-64.3 mg/L Fe). Results from duplicate systems but different reactor shapes indicated reactor dimensions influence flow characteristics and therefore treatment efficacy.

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AMD Treatment in New Zealand – Use of Small-scale Passive Systems

Cited by 2 publications

References 12 publications

Using pilot trials to test geochemical treatment of acid mine drainage on Stockton Plateau

Using pilot trials to test geochemical treatment of acid mine drainage on Stockton Plateau

Performance of Mesocosm-Scale Sulfate-Reducing Bioreactors for Treating Acid Mine Drainage in New Zealand

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