Novel Passive Co‐Treatment of Acid Mine Drainage and Municipal Wastewater

Strosnider, William H.J.; Winfrey, Brandon K.; Nairn, Robert W.

doi:10.2134/jeq2010.0176

Cited by 33 publications

(17 citation statements)

References 36 publications

(55 reference statements)

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“…(Carroll et al, 1998;Younger et al, 2002). Arsenic, Cd, Zn, and Pb will strongly sorb to Fe oxyhydroxides and remain under these conditions (Carroll et al, 1998;Younger et al, 2002;Mohan and Pittman, 2007;Wilkin, 2008;Strosnider et al, 2011).…”

Section: Resultsmentioning

confidence: 99%

Water Quality Impacts From in-Stream Mine Tailings in Rio Tarapaya, Potosí, Bolivia

Strosnider¹,

Nairn²,

Montero³

et al. 2011

JASMR

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Although recent construction of tailings dams has dramatically decreased solids discharge rates, pyrite-dominated polymetallic sulfide mine tailings persist as the primary in-stream substrate of the upper Rio Pilcomayo, a crucial water resource in the arid Southeastern Bolivian highlands. Rio Tarapaya is a primary tributary of the upper Rio Pilcomayo that drains Potosí, Bolivia, where intensive hard rock mining and ore processing has occurred for five centuries. In conjunction with standard water quality testing, field leach tests were performed on saturated sediment within the active channel as well as unsaturated sediment deposited on the banks of the Rio Tarapaya during highflow events. Results indicate that weathering of in-stream tailings is contributing to deleterious concentrations of various ecotoxic metals. Of special concern is the mobilization of metals and acidity with increases in water level, such as occurs at the onset of the rainy season. The highly seasonal, arid climate provides for long periods of mineral oxidation followed by large precipitation events which mobilize weathered oxidation products. The reactivity of the millions of tonnes of in-stream tailings in Rio Tarapaya suggests that the upper Rio Pilcomayo will remain severely degraded for the foreseeable future and remediation will continue to be a daunting task.

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Section: Resultsmentioning

confidence: 99%

Water Quality Impacts From in-Stream Mine Tailings in Rio Tarapaya, Potosí, Bolivia

Strosnider¹,

Nairn²,

Montero³

et al. 2011

JASMR

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“…Passive co-treatment of MWW and AMD in a multi-stage system consistently achieved high BOD and nutrient removal efficiency (Strosnider et al 2011b), removed significant concentrations of dissolved Al, As, Cd, Fe, Mn, Pb, and Zn, and produced a net-alkaline effluent (Strosnider et al 2011a). Other recent reports of passive co-treatment indicated that AMD enhanced coagulation, sedimentation, and pathogen removal during wastewater treatment (Neto et al 2010;Winfrey et al 2010).…”

Section: Introductionmentioning

confidence: 82%

Acute and Chronic Toxicity of Acid Mine Drainage to the Activated Sludge Process

Hughes

Gray

2012

Mine Water Environ

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The combined treatment of acid mine drainage (AMD) and municipal wastewater using the activated sludge process is an innovative approach to AMD remediation. The toxicity of synthetic AMD to activated sludge was evaluated using oxygen uptake rate (OUR) inhibition tests, which showed that activated sludge can withstand high proportions of AMD (EC 50 19-52% AMD by volume). The EC 50 values of municipal and industrial activated sludges were significantly different (p \ 0.05), with municipal sludges exhibiting higher tolerance to AMD. Although the EC 50 values for heterotrophic and nitrifying activated sludges were not statistically significantly different, the EC 50 values for heterotrophic bacteria were generally higher. Laboratory-based sequencing batch reactors were used to examine the treatability of AMD. Increased concentrations of COD and suspended solids, associated with turbidity and poor floc morphology, were observed in the final effluent after extended AMD loading. Protozoan community structure changed during the AMD loading period, and overall abundance tended to decrease over time. OUR decreased in the AMD-loaded reactors, particularly in the reactor receiving the highest AMD load, indicating reduced biomass activity over the acclimatization period. Results from OUR inhibition tests on the acclimatized activated sludge indicated that over a relatively short timescale (21 days), the activated sludge microbial community can adapt to AMD sufficiently so that shock loads of metals and acidity do not significantly inhibit OUR. These preliminary studies indicate that it is possible to treat AMD successfully in admixture with municipal wastewater using the activated sludge process.

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“…Such a treatment can be responsible for As removal from water at rates up to 3.58 ´ 10 −7 mol L −1 s −1 (Egal et al, 2010). Strosnider et al (2011) suggested an alternative treatment for a synthetic AMD with municipal wastewater, using different concentrations of contaminants. These authors identified high efficiencies for As removal (87%), probably due to adsorption onto Fe (hydr)oxides previously flocculated with PO 4 3− in solution.…”

Section: Effectiveness Of Ferric Ferrous and Aluminum (Hydr)oxidementioning

confidence: 99%

Effectiveness of Ferric, Ferrous, and Aluminum (Hydr)Oxide Coprecipitation to Treat Water Contaminated with Arsenate

et al. 2018

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Coprecipitation of Fe and Al (hydr)oxides has been considered a low‐cost process to remove As from wastewater. Arsenate is the most stable form of As in aerobic environments such as surface water, soils, and sediments and can be removed from water through methods based on this process. Iron/aluminum molar ratios of 100:0, 80:20, and 60:40 were used to treat water contaminated with As at concentrations of 50 and 500 mg L−1. Aluminum, ferrous, and ferric sulfates were used to coprecipitate Al and Fe (hydr)oxides at high pH. Maghemite, magnetite, lepidocrocite, and goethite were detected in precipitates from Fe(II), whereas hematite and ferrihydrite were identified in Fe(III) treatments. Segregation of Al (hydr)oxides as gibbsite and bayerite as well as the Al isomorphic substitution in Fe (hydr)oxides were detected in the presence of Al. The precipitates were classified as nonhazardous according to the leaching test based on Brazilian Technical Standard NBR 10005. The presence of Al increased the stability of the sludge from Fe(II) treatments but did not affect the stability of precipitates from Fe(III) treatments. High efficiencies for As removal from water were obtained for all treatments, but concentrations of soluble As were, in general, lower for Fe(III) treatments especially, in the absence of Al. Treatments were efficient in reaching the threshold to effluent discharge (0.5 mg L−1), but only treatments with initially 50 mg L−1 of As reached the threshold for drinking water (10 μg L−1). Core Ideas Up to 500 mg L−1 of arsenate in water could be removed with coprecipitation. Sludge from coprecipitation of As with Fe and Al (hydr)oxides is safe to dispose. Fe (III) is better than Fe (II) to remove soluble As at higher concentrations.

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Novel Passive Co‐Treatment of Acid Mine Drainage and Municipal Wastewater

Cited by 33 publications

References 36 publications

Water Quality Impacts From in-Stream Mine Tailings in Rio Tarapaya, Potosí, Bolivia

Water Quality Impacts From in-Stream Mine Tailings in Rio Tarapaya, Potosí, Bolivia

Acute and Chronic Toxicity of Acid Mine Drainage to the Activated Sludge Process

Effectiveness of Ferric, Ferrous, and Aluminum (Hydr)Oxide Coprecipitation to Treat Water Contaminated with Arsenate

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