Suppression of phosphate liberation from eutrophic lake sediment by using fly ash and ordinary Portland cement
- Chinese Academy of Sciences, Guangzhou (China). State Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry
In this study, the effect of suppression on phosphate liberation from eutrophic lake sediment by using fly ash and ordinary Portland cement (OPC) was investigated by small scale experiment. A system including sediment, lake water, and several kinds of capping materials was designed to clarify the suppression of phosphate liberation from sediment under the anaerobic condition. The suppression efficiencies of fly ash, OPC and glass bead used as control material were also determined, and these effects were discussed. The suppression efficiency of glass bead was 44.4%, and those of fly ash and OPC were 84.4%, 94.9%, respectively. The suppression by fly ash and OPC was mainly carried out by the adsorption effect, in addition to the covering effect. The suppression efficiency depended on the amounts of the material used, and about 90% of liberated phosphate was suppressed by fly ash of 10.0 Kg m{sup -2}, and OPC of 6.0 Kg m{sup -2}. The concentrations of heavy metals, such as mercury, cadmium, lead, copper, zinc, chromium, silver, arsenic and nickel, in fly ash and OPC were lower than those in the environmental materials. And it was considered that the concentrations of heavy metals in fly ash and OPC were too low to influence the ecosystem in natural water region.
- OSTI ID:
- 20862080
- Journal Information:
- Journal of Environmental Science and Health, Part A: Toxic Hazardous Substances and Environmental Engineering, Vol. 41, Issue 8; ISSN 1093-4529
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
54 ENVIRONMENTAL SCIENCES
36 MATERIALS SCIENCE
FLY ASH
PORTLAND CEMENT
PHOSPHATES
LAKES
SEDIMENTS
INHIBITION
WATER POLLUTION CONTROL
WASTE PRODUCT UTILIZATION
BENCH-SCALE EXPERIMENTS
EFFICIENCY
GLASS
COMPARATIVE EVALUATIONS
CONCENTRATION RATIO
TRACE AMOUNTS
METALS
ENVIRONMENTAL IMPACTS
ECOSYSTEMS