Stripping as a pretreatment process of industrial oily wastewater

Evaporation and air-stripping to assess and reduce ethanolamines toxicity in oily wastewater

“…The chemical method is primarily based on the neutralisation of detergents and a change of the pH of the solution followed by further purification for the liquid phase. The physical method is based on the mechanical phenomenon of gravitational breaking (flotation or dissolved air flotation), ultra-filtration membrane separation or micro-filtration, whereas the thermal method mainly focuses on heating or evaporation processes [1,2,4]. The resulting liquid phase, containing residual oil, should be subjected to further 4 2− (mg/L) 50-1500 P-PO 4 3− (mg/L) 10-70 Surfactants (mg/L) 100-3000 treatment in order to achieve the current effluent standard for the receiving waters (e.g.…”

“…Most of these substances are suspected to be toxic and carcinogenic, and generally have low biodegradability. This fact, combined with the high organic pollution load in terms of chemical oxygen demand (COD) and matrix effect [1], makes the purification of such wastewater a difficult task [2][3][4]. In Italy, as in many other Mediterranean countries, oily wastewater is a major environmental problem in the coastal zone, where the chemical industry produces significant amounts of industrial waste [5].…”

“…Oily wastewater generated by various industries, frequently occurring in the form of oil-in-water emulsion, creates a major problem around the world [2,8,9]. Oily wastewater is generated by different activities such as refinery, petrochemical and lubricant production units, metal finishing, metal working, textile industry and paper mills [4,10] and can have a complex composition because it may contain mineral, vegetal or synthetic oils, fatty acids, emulsifiers, corrosion inhibitors and bactericides.…”

Modeling Tool for Air Stripping and Carbon Adsorbers to Remove Trace Organic Contaminants

“…The removal efficiency of the packed tower depends on the air to water flow rate ratio, the mass transfer coefficient and the water temperature. Higher values of evaporation rate of the solvent in comparison with the rate of organic compound decrease organic removal from oily wastewater at temperature above 330K [12]. Hence, the major design parameters for designing packed stripper towers include: air to water ratio, hydraulic loading rates, packing material, size depth and diameter, gas pressure drop, and Henry's constant of the contaminant.…”

Abatement of phenolic mixtures by catalytic wet oxidation enhanced by Fenton's pretreatment: Effect of H2O2 dosage and temperature

“…Among these residual aqueous streams the wastewaters containing phenol and cresols could be a typical example of effluent that requires an advanced treatment technology. These effluents are obtained mainly in petrochemical and coal processing industries [4][5][6][7][8][9][10][11][12][13][14][15].…”