Alkaline injection technology: Field demonstration

Canty, Geoffrey A.; Everett, John W.

doi:10.1016/j.fuel.2006.05.010

Cited by 9 publications

(5 citation statements)

References 6 publications

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“…Lime neutralization/precipitation, referred to in mining circles as the ''chemical process'', is often used to treat AMD in the mining industry (Canty and Everett, 2006). During lime treatment, the most commonly used process, AMD is discharged directly into a rapid mix chamber where hydrated lime is added in dry form or as slurry.…”

Section: Introductionmentioning

confidence: 99%

Inorganic pigments made from the recycling of coal mine drainage treatment sludge

Marcello

Galato²,

Peterson

et al. 2008

Journal of Environmental Management

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Section: Introductionmentioning

confidence: 99%

Inorganic pigments made from the recycling of coal mine drainage treatment sludge

Marcello

Galato²,

Peterson

et al. 2008

Journal of Environmental Management

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“…In addition, the use of fly ashes in the remediation of AMD by active chemical treatment has been reported (Kuhn 2005, Potgieter-Vermaak et al 2006, Gitari et al 2008b. Furthermore, the treatment of AMDcontaminated groundwater in abandoned mines by means of injection of alkaline materials such as fluidized bed coal combustion fly ashes has also been successful (Canty & Everett 2006).…”

Section: Acid Mine Drainage Remediationmentioning

confidence: 99%

“…One of the first applications of CFA to treat AMD was performed in an abandoned coal mine in eastern Oklahoma in 1994. (Canty & Everett 2006) employed an in-situ technique called 'alkaline injection technology (AIT)', which consisted in the injection of fluidized bed combustion fly ash González et al (2007) directly into the abandoned mine. The experiment began in 1997 and the initial concentrations of iron (179 mg L -1 ), manganese (6.7 mg L -1 ) and aluminium (3 mg L -1 ) were reduced to 30, 1.5 and 0.1 mg L -1 , respectively.…”

Section: Acid Mine Drainage Remediationmentioning

confidence: 99%

“…The generation of combustion by-products is a global problem with severe implications for human health, environment and industry. On the one hand, high storage, transport and disposal costs must be faced by plant operators and waste management companies and, on the other hand, leaching of elements that are of environmental concern through the soil to the groundwater may impact negatively the terrestrial and aquatic ecosystems (Canty & Everett 2006, Jankowski et al 2006). Nowadays industry is very interested in the reuse of such by-products as coal (CFA) and petroleum coke fly ashes (PCFA) whenever the reuse allows costs to be saved and to maintain the product quality as well as process stability at the same time.…”

Section: Introductionmentioning

confidence: 99%

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Fly ashes from coal and petroleum coke combustion: current and innovative potential applications

2009

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Coal fly ashes (CFA) are generated in large amounts worldwide. Current combustion technologies allow the burning of fuels with high sulfur content such as petroleum coke, generating non-CFA, such as petroleum coke fly ash (PCFA), mainly from fluidized bed combustion processes. The disposal of CFA and PCFA fly ashes can have severe impacts in the environment such as a potential groundwater contamination by the leaching of heavy metals and/or particulate matter emissions; making it necessary to treat or reuse them. At present CFA are utilized in several applications fields such as cement and concrete production, agriculture and soil stabilization. However, their reuse is restricted by the quality parameters of the end-product or requirements defined by the production process. Therefore, secondary material markets can use a limited amount of CFA, which implies the necessity of new markets for the unused CFA. Some potential future utilization options reviewed herein are zeolite synthesis and valuable metals extraction. In comparison to CFA, PCFA are characterized by a high Ca content, suggesting a possible use as neutralizers of acid wastewaters from mining operations, opening a new potential application area for PCFA that could solve contamination problems in emergent and mining countries such as Chile. However, this potential application may be limited by PCFA heavy metals leaching, mainly V and Ni, which are present in PCFA in high concentrations.

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“…In situ treatment has been suggested such as the addition of alkaline materials (e.g., fly ash) and organic carbon into mine voids or pools (Houston et al 2005;Canty and Everett 2006;Wendt-Potthoff et al 2010). Although in-situ treatment has been studied as a potential option, applications have only been done in small-scale trials (Wolkersdorfer 2006).…”

Section: Introductionmentioning

confidence: 99%

Water quality changes of a closed underground coal mine in Korea

Cheong

Yim

et al. 2011

Environ Monit Assess

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The objective of this study was to assess the changes in mine water quality as an underground mine flooded from July 2005 to October 2008. The effect of air injection with a blower into the water was used to evaluate the potential to convert ferrous to ferric iron and to provide in situ treatment and precipitation. Mine flooding averaged 31 cm/day with a linear shape until November 2007, when it flattened out due to outflow. During flooding, mine water pH remained around 6, but Eh shifted from 200 to -150 mV. After the mine water level stabilized, contents of elements such as Fe and SO(4) tended to decrease as time passed. Air was injected by diffusers (150 L/min/each) at three different depths of 2, 3, and 5 m below the water level in the shaft. Dissolved oxygen eventually increased to 4 or 5 mg/L depending on the depth of the diffusers. Aeration caused conversion of ferrous iron to ferric iron and about 30 mg/l of iron was removed from the mine water. Therefore, air injection shows potential as a semi-active treatment or part of conventional treatment to precipitate iron in the mine pool.

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Alkaline injection technology: Field demonstration

Cited by 9 publications

References 6 publications

Inorganic pigments made from the recycling of coal mine drainage treatment sludge

Inorganic pigments made from the recycling of coal mine drainage treatment sludge

Fly ashes from coal and petroleum coke combustion: current and innovative potential applications

Water quality changes of a closed underground coal mine in Korea

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