Investigation of the removal of trace toxic heavy metal ions from waste water by foam fractionation. Final report

Technical Report · Sat Apr 01 00:00:00 EST 1978

OSTI ID:5573553

Okamoto, Y; Chou, E J

The experimental work on the removal of a trace amount of metallic ions such as beryllium, cadmium, lead, mercury, copper and nickel from aqueous solution by a foam separation technique using chelating surfactants was investigated. Surfactants containing polyamine such as 4-dodecyldiethylene triamine were used as selective chelate surfactants. These ions could be removed quantitatively using a selected surfactant. These surfactants chelated with metallic ions which were found to be concentrated in the foam. The foam was removed from the liquid, and the surfactant was regenerated and recycled by the decomposition of the surfactant-metal ion complexes with Na2S and H2S. Those metal ions were precipitated as the metal sulfides and the regenerated surfactant was recycled. To establish the feasibility of using foam separation for the separation of a particular ion from one or more ions having similar charge, a selectivity coefficient was determined. The selectivity coefficient was found to be a function of surface tension of complexes and chelation constant of chelating surfactant with metallic ion.

• Research Organization: Polytechnic Inst. of Brooklyn, NY (USA). Dept. of Chemistry
• DOE Contract Number: DI-14-30-3299
• OSTI ID: 5573553
• Report Number(s): PB-292706
• Country of Publication: United States
• Language: English

Related Subjects

54 ENVIRONMENTAL SCIENCES
BERYLLIUM
REMOVAL
CADMIUM
COPPER
LEAD
MERCURY
NICKEL
WATER POLLUTION CONTROL
CHELATING AGENTS
SURFACTANTS
FEASIBILITY STUDIES
FOAMS
PRECIPITATION
ALKALINE EARTH METALS
COLLOIDS
DISPERSIONS
ELEMENTS
METALS
POLLUTION CONTROL
SEPARATION PROCESSES
TRANSITION ELEMENTS
520200* - Environment
Aquatic- Chemicals Monitoring & Transport- (-1989)