Removal of toxic metals from power-generation waste streams by adsorption and coprecipitation
Removal of potentially toxic contaminants from aqueous solution by adsorption onto iron oxyhydroxide is technically feasible. Removal is primarily a function of pH, though other factors, such as adsorbent concentration, and concentration of other ions in solution, can also play an important role. Despite the complexity of waste streams from coal-fired plants, adsorption of trace contaminants from these streams is similar to that in simple clean solutions. In particular, the adsorption of Zn onto iron oxide from relatively dilute power-plant waste streams can be explained using a surface complexation model. Deviations from the behavior in dilute solutions can occur when the concentration of a competing ion, such as Cu, is high, or when a strong complexing agent, such as EDTA, is present. These deviations are interpretable using simple modeling concepts, and the interpretations can be experimentally tested and verified using well-defined solutions. The process is applicable for removing both cations and anions from solutions and is adaptable to different process flowsheets and is relatively simple to control.
- Research Organization:
- Univ. of Washington, Seattle
- OSTI ID:
- 6112427
- Journal Information:
- J. - Water Pollut. Control Fed.; (United States), Vol. 54:11
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
FOSSIL-FUEL POWER PLANTS
WATER POLLUTION CONTROL
WASTE WATER
PURIFICATION
ADSORPTION
IRON OXIDES
PRECIPITATION
TOXIC MATERIALS
WASTE PROCESSING
ZINC
CHALCOGENIDES
CONTROL
ELEMENTS
HYDROGEN COMPOUNDS
IRON COMPOUNDS
LIQUID WASTES
MANAGEMENT
MATERIALS
METALS
OXIDES
OXYGEN COMPOUNDS
POLLUTION CONTROL
POWER PLANTS
PROCESSING
SEPARATION PROCESSES
SORPTION
THERMAL POWER PLANTS
TRANSITION ELEMENT COMPOUNDS
WASTE MANAGEMENT
WASTES
WATER
520200* - Environment
Aquatic- Chemicals Monitoring & Transport- (-1989)