Amending highly acidic blowdown sludge by direct addition of beneficiated alumina refinery residue

Fergusson, Lee (2015) Amending highly acidic blowdown sludge by direct addition of beneficiated alumina refinery residue. International Journal of Multidisciplinary Research and Development, 2 (3). pp. 616-624. ISSN 2349-5979

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This paper examines the relationship between sulfuric acid plant blowdown sludge and alumina refinery residue. Specifically, the research focuses on the neutralization of high levels of acidity in blowdown sludge (i.e., pH <1.0) and the reduction of leachable mercury (average 17.0 mg/L), a major contaminant in this type of industrial sludge at >19,000 mg/kg or 1.9%, using a modified form of alumina refinery residue, also called bauxite residue. Ten experiments on three different types of blowdown sludge were carried out to determine the potential role beneficiated alumina refinery residue might play in neutralizing acid and sequestering leachable mercury into non-bioavailable forms.

Results from the study indicate that while all ten treatments either partially or completely neutralized
acid and reduced leachable mercury by an average of 68%, only one was successful in reducing mercury to <0.1 mg/L. These findings suggest that alumina refinery residue may be useful in sequestering heavy metals in other forms of industrial solids, sludges and filter cakes.

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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Published version deposited in accordance with the copyright policy of the publisher.
Faculty/School / Institute/Centre: No Faculty
Faculty/School / Institute/Centre: No Faculty
Date Deposited: 20 Aug 2018 05:06
Last Modified: 03 Sep 2018 04:35
Uncontrolled Keywords: acidity, mercury, blowdown sludge, sulfuric acid plant, alumina refinery residue
Fields of Research (2008): 05 Environmental Sciences > 0502 Environmental Science and Management > 050207 Environmental Rehabilitation (excl. Bioremediation)
Fields of Research (2020): 41 ENVIRONMENTAL SCIENCES > 4104 Environmental management > 410405 Environmental rehabilitation and restoration
Socio-Economic Objectives (2008): D Environment > 96 Environment > 9611 Physical and Chemical Conditions of Water > 961101 Physical and Chemical Conditions of Water for Urban and Industrial Use

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