Effects of alkaline aluminate waste dumping on seawater chemistry |
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| Authors: | R Vandelannoote L Van't Dack R Van Grieken |
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| Institution: | 1. Department of Veterinary Medicine, University of Bari, Valenzano, Italy;2. Division of Veterinary Biology, School of Veterinary Studies, Murdoch University, Murdoch, Western Australia, 6150, Australia;3. Aggeu Magalhães Institute, Fundação Oswaldo Cruz (Fiocruz), Recife, Brazil;4. Department of Pathobiology, Faculty of Veterinary Science, Bu-Ali Sina University, Hamedan, Iran;1. Exxaro Chair in Business and Climate Change, Institute for Corporate Citizenship, Unisa, P.O. Box 392, Unisa 0003, South Africa;2. International Water Management Institute (IWMI), Southern Africa Regional Office, Private Bag x813, Silverton 0127, South Africa;3. Department of Economics, Unisa, P.O. Box 392, Unisa 0003, South Africa |
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| Abstract: | The alkaline aluminate waste, of which 1000–2000 tonnes are dumped a few times a year off the Belgian coast in the Southern Bight of the North Sea, contains 5·4% NaCl, 1·8% dissolved Al and 7·4% NaOH, in addition to traces of heavy metals and some aniline- and phenol-derivatives. The pH rises locally to 8-5 and the total Al-concentration reaches 120niglitre−1(corresponding to an initial waste dilution factor of only 150) in the 10-m wide track just beyond the discharging barge, but these decay quickly to pH 8·1 and 1 mg litre-1 in the 30-m wide track, 500m behind the barge. The relation between the waste concentration and seawater pH was studied. The white precipitate that forms immediately in the sea was identified as Mg6---Al2---CO3---(OH)16---4H20 (hydrotalcite-manasseite like). No trace of it was found in the local sediments. |
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