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Ultrafiltration of dye solutions in the presence of cationic and anionic surfactants

Majewska-Nowak K.

Environment Protection Engineering

2009

Vol. 35, nr 4

111-121

The objective of the study was to investigate the influence of surfactant in model dye solutions on the ultrafiltration efficiency. The anionic detergent (sodium dodecyl sulphate (SDS)) and cationic detergent (hexadecyltrimethylammonium bromide (CTAB)) were added to the dye solutions. Three anionic organic dyes of molecular weights ranging from 327 to 1060 Da were applied. Intersep Nadir membranes made of polyethersulfone and regenerated cellulose were used in the experiments. The operation pressure varied from 0.1 to 0.20 MPa. The concentration of dyes in model solutions was equal to 100 g/m3, whereas surfactant dosage amounted to 0.1, 0.6 and 1.0 CMC (critical micelle concentration). The experiments revealed dye retention by surfactant present in experimental solutions was strongly affected by the nature of detergent, membrane material and membrane cut-off value. It was also found that the presence of an anionic surfactant brought about the worsening of separation factor, whereas the cationic surfactant improved dye rejection.

Biologiczna ocena skuteczności odbarwiania roztworów barwników w procesie pogłębionego utleniania

Jamroz T., Ledakowicz S., Żyłła R., Sencio B.

Ochrona Środowiska

2001

nr 1

29-32

The decolorization process under test carried out by advanced oxidation processes (AOPs) and its effect on the survival of bacteria was studied. Aqueous solutions of reactive dyestuff (Reactive Blue 81; 100mg/dm[3] ) were decolorized by using O3, O3/H2O2, O3/UV, and H2O2/UV as oxidizing agents. Each oxidation process was discontinued after complete decolorization had been achieved. The toxicity of the intermediates formed in the course of the AOPs was determined by the growth test method. The results showed that untreated dyestuff had no toxic effect on the bacterial cultures made use of in the study (E. coli, P. putida, B. subtilis) up to the dye concentration of 1000 mg/dm[3]. Decolorization in the presence of O3 or O3/UV exerted detrimental effect on E. coli. In the presence of O3/HO2 or H2O2/UV, bacterial growth was seriously inhibited (from 48 to 67%).