Effects of alkaline aluminate waste dumping on seawater chemistry
Vandelannoote, R.; Van 't Dack, L.; Van Grieken, R. (1987). Effects of alkaline aluminate waste dumping on seawater chemistry. Mar. Environ. Res. 21: 275-288 In: Marine Environmental Research. Applied Science Publishers: Barking. ISSN 0141-1136; e-ISSN 1879-0291, more |  |
| Keywords | Aquatic sciences > Marine sciences > Earth sciences > Oceanography > Chemical oceanography
Chemical elements > Nonmetals > Aluminium
Monitoring > Environmental monitoring > Pollution monitoring
Properties > Chemical properties > Alkalinity
Waste disposal
Waste disposal > Ocean dumping
ANE, Belgium [Marine Regions]; ANE, North Sea, Southern Bight [Marine Regions]
Marine/Coastal |
| Authors | | Top | - Vandelannoote, R.
- Van 't Dack, L.
- Van Grieken, R., more
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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 120 mg liter-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 liter-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 Mg6Al2CO3(OH)16.4H2O (hydrotalcite-manasseite like). No trace of it was found in the local sediments. |
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