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The present study proposes the application of high sheared membrane modules in separating oil and water from their emulsified form. Moreover, the assessment was carried out with oil-in-water (o/w) emulsion after being treated with different electrolytes and the results from the treated feed to the membrane were compared with the untreated feed to the membrane. Two high sheared modules, namely, a turbine flow membrane module (TFMM) and a radial flow membrane module (RFMM), were compared to understand the superlative performance in removing oil from its o/w emulsion (either treated or untreated) using a 25 kDa polysulfone (PSf) membrane at different temperatures and pressures. It was observed that the permeate flux is 30-38% higher in all the cases with TFMM, depending on operating temperature and pressure. Furthermore, among the electrolytes used, 15% sodium sulfate (Na 2 SO 4 ) solution shows a maximum of 26% oil removal from emulsion, while TFMM shows a 45% higher permeate flux compared to RFMM with this pretreated feed compared to the module.

The present study investigates the bioremediation of waste engine oil at both dissolved or being suspended in oily wastewater using an actinobacterium, Gordonia terrae DSM 43249 strain isolated from East Kolkata wetlands. The isolated strain was found capable of sustaining in highly toxic oil contaminated wastewater and simultaneously can efficiently biodegrade the pollutants in both simulated fresh and marine water system at optimized environmental conditions. Moreover, in order to understand the effect of physical presence of oil in oily wastewater on the bioremediation process, three types of simulated oil-water forms were studied: water with free waste engine oil, oil-water mixture in the form of coarse emulsion and microemulsion. It was observed that the percentage degradation became maximum with the microemulsion form (72.73%) followed by the coarse one (65.45%). The minimum percentage degradation of 39.74% was seen with the free oil. Statistical interpretation also revalidates the experimental observations, showing that the oil percentage degradation is much sensitive to the oil and water composition in an oily-water system (F=772.64> Fcritical =5.143). Hence, it is presumed from the present study that such a high percentage degradation of oil especially, when oil is thoroughly mixed with water, can be considered as one of the potential applications for oil treatment such as during oil spillage using G.terrae DSM 43249.

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