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Geochemical performance of a reducing and alkalinity-producing system (RAPS) for the passive treatment of acidic mine drainage at Bowden Close, United Kingdom

Lookup NU author(s): Dr Daniel Fabian, Professor Andrew Aplin, Professor Paul Younger


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At Bowden Close, an abandoned colliery located in the northeast of England, a pasive treatment system has been constructed to improve acidic mine water quality by the combination of bacterial sulfate-reduction and limestone dissolution. The performance of the first twelve months of full operation shows that pH values increased from as low as 3.6 to as high as 7.9 as the mine water passed through the system. Added alkalinity amounted to 5.91 t (calculated as CaCO3). Removal of iron and alumium was very efficient: overall 89% of iron (1.81 t) and 93% of aluminium ((0.91 t) were retained by the treatment system. In contrast, only 18% (6.20 t) of sulfate has been removed over the same period. Both sulfate reduction and limestone dissolution contributed to the removal of acidity and the generation of alkalinity.

Publication metadata

Author(s): Fabian D, Aplin AC, Younger PL

Editor(s): Loredo J

Publication type: Conference Proceedings (inc. Abstract)

Publication status: Published

Conference Name: Proceedings of the 9th International Mine Water Association Congress

Year of Conference: 2005

Pages: 383-387

Publisher: Departamento de Explotación y Prospección de Minas