Treatment of produced water by induced air flotation: effect of both TWEEN 80 and ethanol concentrations on the recovery of PAHs

Abstract

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.

Water-Soluble Pd6L3 Molecular Bowl for Separation of Phenanthrene from a Mixture of Isomeric Aromatic Hydrocarbons

“…This absorption profile of corornene ⊂ TB is in good agreement with the characteristic absorption of coronene. Similarly, naphthalene ⊂ TB and NBr ⊂ TB show characteristic absorption bands at 219 and 222 nm (Figure S51), which are in good agreement with the literature reports on ethanol/water for naphthalene …”

“…Similarly, naphthalene ⊂ TB and NBr ⊂ TB show characteristic absorption bands at 219 and 222 nm (Figure S51), which are in good agreement with the literature reports on ethanol/water for naphthalene. 23 TB is, therefore, a potential host for various PAHs in aqueous medium. The guest uptake affinity of TB toward PAHs was quantified in terms of binding constants (K a ) from the UV−visible titration experiments.…”

Amphiphilic dendrons as supramolecular holdase chaperones

“…2 and Fig. S1, ESI†) show major peaks around 225 and 245 nm, corresponding to π → π * transitions, 24–26 and above 300 nm, arising from n → π * transitions. 27 Cooling solutions of 1 , 2 , and 3 from 75 to 20 °C lead to structure- and concentration-dependent spectral changes.…”

Microbubble and nanobubble-based gas flotation for oily wastewater treatment: a review

“…IGF systems (Fig. 11) have been widely used in treating various types of industrial wastewater from different sources including oil and gas production, pulp and paper mills, and dairy industry (Al-Maliky 2010; Zasadowski et al 2014;Chebbi et al 2018).…”