Abstract
ABSTRACT 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 1000 mg/L of oil. The wastewaters were subjected to hydroxide treatment or sulfide treatment and collectors simultaneously with air flotation. The precipitants were mixed rapidly into solution for 2 min, followed by a flotation time of 4 min. 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 1442 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-injec...
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