Removal of Industrial Cutting Oil from Oil Emulsions by Polymeric Ultra- and Microfiltration Membranes

Abstract

The utilization of micro-and ultrafiltration with polymeric membranes for treatment of industrial cutting oil emulsion was investigated. The performance of 14 different membranes with pore sizes in the range of 1-800 nm, representing 8 different materials and varying hydrophobicity, was determined experimentally. Membrane permeances between 1.6 and 939 L m -2 h -1 bar -1 have been observed for the different samples as well as oil rejections between 3.42% and 99.99%. Membrane pore size and contact angle showed little influence on both values, while an interesting correlation is displayed to the individual membranes' capillary pressures. A possible explanation for this phenomenon is suggested based on the formation of oil films on the membrane surface. From the investigated membranes, the best-suited one for cutting oil treatment was selected and subjected to further experiments. The effect of process temperatures between 22 and 43°C and of feed oil concentrations between 0 and 20 vol % on the removal performance was determined. The results correspond to the explanation suggested previously.

Cutting fluid effluent removal by adsorption on chitosan and sds-modified chitosan

“…Pseudo first-order equation is expressed in the form of: (6) where q t is the amount of adsorption at time t (g/kg), k 1 is the rate constant of pseudo first-order adsorption (1/min). After integration and applying the initial condition q t = 0 at t = 0, eq.…”

“…Conventional treatment methods of oil-water emulsions are skimming, gravity setting, emulsion breaking, 1 chemical de-emulsification, 2 flotation, 3 combination of destabilization and flotation, 4 and membrane. 5,6 Some researchers introduce supercritical water oxidation 7 to treat cutting fluid but this method consumes a lot of energy.…”

Simultaneous elimination of dissolved and dispersed pollutants from cutting oil wastes using two aqueous phase extraction methods

“…The significant developments of the formulations of cutting oils as well as the preparation of the synthetic or semi-synthetic emulsions complicate some more the issue of the purification of these effluents which is attributed to the stability of these emulsions. Moreover, it has been reported [7][8][9][10][11][12][13] that some conventional methods especially evaporation, membrane or chemical separation generate a concentrated stream which is more harmful than the original waste. Accordingly, no ideal solution was reported in the literature to resolve such problem; where the combination of two or more treatment processes was the sole issue to increase the purification efficiency.…”

Recovery of oil from oil-in-water emulsion using biopolymers by adsorptive method

“…It is difficult to use biological method to treat the cutting fluid due to its toxicity. Conventional treatment methods of oil-in-water emulsions are skimming, gravity setting, emulsion breaking [12], chemical de-emulsification [13], the combination of destabilization and flotation [14] and membrane [15]. Adsorption is a far and wide accepted technology for both organic and inorganic contaminants such as cutting fluid [2], dyes [16], fluoride [17], nitrate [18], phosphate [19], perchlorate [20] etc.…”