Abatement of ARD with solid alkaline waste materials : A meso-scale field test with emphasis on general hydrochemical parameters

• Abatement of acid mine drainage (ARD) can be made by controlling pH and Eh of the effluents, to optimise retention of major and trace components. The use of solid alkaline waste products from lime production, pulp and paper industry and steel production as well as ashes from bio fuels was evaluated in a meso-scaleexperiment. Each test system hadthree 0.4 m3barrelsthat contained the alkaline waste, a passive support and peat nuggets, in this order.The alkaline wastes consisted of lime kiln dust (LKD), green liquor dreg (GLD), lime mud (LM), LD-slag and fresh and aged ashes. The ARD came either from reactors with acid waste or water taken from a nearby mine shaft. Neutralization was observed for fresh ash, LKD, LD and LM/ash with pH of 6.5, 8.9, 5.3 and 6.6, respectively. The corresponding alkalinities were 0.3, 10.1, 1.8 and 0.5 meqv/l. For carbonated ash and GLD the pH was 3.9 and 4.7 and with acidity remaining. In the best performing systems the average trace metal retention was Pb (>99%), Cu (>99%), Cd (90%) and Zn (70%).

Ämnesord

NATURVETENSKAP  -- Geovetenskap och miljövetenskap (hsv//swe)

NATURAL SCIENCES  -- Earth and Related Environmental Sciences (hsv//eng)

Nyckelord

Acidic mine waste

alkaline waste products

trace metals

Enviromental Science

Miljövetenskap

Publikations- och innehållstyp

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