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Removal and recovery of some phenolic pollutants using liquid membranes.

2010; University of Bucharest; Volume: 15; Issue: 6 Linguagem: Inglês

2248-3942

Ioana Diaconu, R. Gîrdea, Camelia Cristea, Gheorghe Nechifor, Elena Ruse, Eugenia Eftimie Totu,

Membrane-based Ion Separation Techniques

In this work, the data obtained using bulk liquid membranes for removing mono and disubstituted phenolic nitro derivatives (p-nitrophenol, m-nitrophenol, 2,4-dinitrophenol) from a source of waste water are presented. Based on the speciation diagrams of the phenolic compounds the optimum operation parameters (as pH values) of feeding and receiving phases for the transport efficiencies were established. When the waste water source (feeding source) had an acidic pH, the efficiency to transfer the studied phenolic nitro derivatives through a chloroform liquid membrane into an alkaline receiving phase (pH = 12) was greater than 90%. The fortified samples from the residual sources, in a concentration range of 0.8 - 250 mg/L resulting after the nitrophenols removal, were tested at pH=2 and pH =7 for their biocide properties using Pseudomonas aeruginosa bacteria. The toxicity tests were realized on residual sources at pH=2 and pH=7. The experiments performed proved that the tested compounds do not have any bactericide effect within the studied concentration range against the Pseudomonas aeruginosa strain.