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Review of emerging issues in sediment treatment
T.P. Murphya,
A. Lawsona,
M. Kumagaib,
I. Babinc
aNational
Water Research Institute, 867 Lakeshore Road, Burlington,
Ontario L7R 4A6 Canada
bLake
Biwa Research Institute, 1-10 Uchidehama, Otsu, Shiga 520,
Japan
cGolder
Associates, Room 202, 2/F, Jockey Club, 77 Tat Chee Ave.,
Kowloon Tong, Hong Kong, People's Republic of China
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Abstract
Sediment treatment options include dredging, physical and chemical
capping, and in situ sediment treatment. In our studies, in sib
sediment treatment has been used to oxidize sediment sulphides,
control eutrophication and bioremediate organic contaminants. Sediment
contamination of various types was studied in 22 sites from six
countries in North America, Europe and Asia. In Hong Kong, field
testing of sediment treatment oxidized 99% of sulphide and controlled
odours. In Lake Biwa, Japan, where excess nutrients in sediments
enhanced growth of toxin producing algae, sediment treatment with
calcium nitrate blocked growth of these algae. Oxidation of sulphide
in Lake Biwa sediments precipitated > 80% of the porewater phosphorus.
Oxidation of sulphides and addition of nutrients biodegraded more
than half of the organic contaminants in Hamilton Harbour, Canada.
The biotreatability of polynuclear aromatic hydrocarbons is very
site specific and is faster in sites with higher concentrations
of oil. © 1999 Elsevier Science Ltd and AEHMS. All rights reserved.
Keywords: In situ; Odour; Eutrophication; PAH; Sediment treatment;
Bioremediation
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