The simultaneous removal of oil and heavy metals from industrial wastewaters using hydroxide or sulfide precipitation coupled with air flotation

Journal Article · · Hazardous Waste and Hazardous Materials; (USA)

DOI:https://doi.org/10.1089/hwm.1989.6.327· OSTI ID:5764277

Peters, R W ^[1]; Bennett, G F ^[2]

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1. Argonne National Laboratory, IL (USA)
2. Univ. of Toledo, OH (USA)

A combined chemical-precipitation/air-flotation system was studied to simultaneously remove heavy metals and oil from a synthetic wastewater typically containing 25 mg/L each of copper, lead, and zinc, plus 1,000 mg/L of oil. The wastewaters were subjected to hydroxide treatment or sulfide treatment and collectors simultaneously with air flotation. The effects of various collectors and their dosages, as well as the type of precipitant, were examined in terms of removals of oil and heavy metals. Five different chemical collectors were investigated -- sodium lauryl sulfate (NaLS), Atlasep 2A2, Nalco-7182, Nalco-7734, and TFL-365; applied collector dosages ranged from 0 to 1,442 mg/L. Removals of heavy metals and oils of at least 93.85% can be attained using this innovative technology. The residual concentrations are sensitive functions of pH, collector type and dosage, precipitant type, and air-injection rate. The presence of oil had little, if any, effect on the removal of Cu and Pb by sulfide precipitation, while the removal of Zn decreased by about 38% due to the presence of oil. No single chemical collector or precipitant type provided the optimal removal of all constituents studied. Hydroxide precipitation resulted in lower concentrations than sulfide precipitation using the NaLS and Atlasep 2A2 collectors, while sulfide precipitation resulted in lower residual concentrations using the Nalco-7182 and Nalco-7734 collectors.

• OSTI ID: 5764277
• Journal Information: Hazardous Waste and Hazardous Materials; (USA), Journal Name: Hazardous Waste and Hazardous Materials; (USA) Vol. 6:4; ISSN 0882-5696; ISSN HWHME
• Country of Publication: United States
• Language: English

Related Subjects

54 ENVIRONMENTAL SCIENCES
540320* -- Environment
Aquatic-- Chemicals Monitoring & Transport-- (1990-)
CHALCOGENIDES
COPPER
ELEMENTS
HYDROGEN COMPOUNDS
HYDROXIDES
LEAD
LIQUID WASTES
MANAGEMENT
MATERIALS RECOVERY
METALS
OILS
ORGANIC COMPOUNDS
OTHER ORGANIC COMPOUNDS
OXYGEN COMPOUNDS
PRECIPITATION
PROCESSING
RECOVERY
SEPARATION PROCESSES
SULFIDES
SULFUR COMPOUNDS
TRANSITION ELEMENTS
WASTE MANAGEMENT
WASTE PROCESSING
WASTE WATER
WASTES
WATER
ZINC