The present study investigates the application of induced air flotation (IAF) technique on PAHs (PAHs) removal performance from a real oilfield produced water of a separator cell. The quantification of total PAHs (PAHtot) was done using ultraviolet-visible spectrometry (UV-Vis) according to the naphthalene calibration curve. The UV-Vis spectra of naphthalene dissolved in a mixture of the binary solvent (water-ethanol) and the Tween 80 showed stability in the molecular orbital of C10H8. The use of small concentration of Tween 80 was revealed to be discrete in the quantification of PAHtot. The flotation process was improved at the critical micelle concentration of Tween 80 (CMC) of 2 % and the critical coalescence concentration of ethanol (CCC) of 0.5 mL/L for the PAHtot recovery of 49.76 % and the PAHtot content in the pulp of 50.24 %. At these concentrations, half of PAHtot was removed from produced water PW. Above the CMC and the CCC, the PAHtot recovery decreased and the PAHtot content in the pulp increased. It was found that there is a collector concentration at which the amount of water carrying from the pulp to the concentrate was increased and in parallel, the PAHtot recovery increased and the PAHtot content in the pulp decreased. Both of the CMC and the CCC have promoted the decrease on the conditioning time from 30 to 10 min and the flotation time from 20 to 6 min. Since the impeller speed and air flow rate were constant, the flotation of PAHs was limited. The flotation kinetics of PAHtot was described by the Higuchi model.
Soils of industrial regions are more sensitive to transfer and accumulate anthropogenic pollution, especially in the case of a Havaria. The environmental effects of three aluminium plants-a working plant (Tajikistan), a storage plant (Slovakia) and a Havaria-affected plant (Hungary)-were examined by the determination of the contamination levels. In addition, the research focus was on to identify and compare the topsoil chemical properties near the aluminium plants and to assess the effects of the red mud accident in Hungary (Ajka), by analysing contaminated soil in this particular area. Using X-ray fluorescence (XRF) spectroscopy analysis, amount of 9 toxic metals in the shallow topsoil (0-20, 20-40 cm) from industrial areas were measured. Considering all of the studied areas around aluminium plants, extreme concen
NOTES 449The a-benzyldeaoxybemoin required in the above syn-the& waa prepared by alkylation of desoxybenzoin with benzyl chloride in the presence of sodamide in liquid ammonia using the general procedure developed by Hauserg for such alkylations.It had been shown that 1,2dihydronaphthalene reacts with 2,4-hexadienoic acid (sorbic acid) to give a phenanthrene derivative I in 18% yield.2
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