Removal of oil from oil/water emulsions using electroflotation process

Abstract

Dispersed oil was separated from oil-water emulsions in an electroflotation cell equipped with insoluble electrodes: titanium coated with ruthenium oxide as anode and stainless steel screen as cathode. The effect of operating parameters such as current density, oil concentration, flotation time and coagulant concentration, on the performance of the electroflotation cell was examined. Oil removal reached 70% at optimum conditions; 75% in the presence of NaCl (3.5% by wt); and 99.5% in the presence of both NaCl and an optimum concentration of coagulant. Electrical energy consumption varied from 0.4 to 1.6 kWh m )3 according to experimental conditions. The performance of the oil removal process was also represented by a first order kinetic rate model. The constants obtained fit the experimental data well. Good correlation was found for the change in percentage oil removal within a wide range of operating parameters.

Oil field effluent water treatment for safe disposal by electroflotation

“…Mansour and Chalbi [13] separated dispersed oil from oil-water emulsions in an electroflotation cell equipped with insoluble electrodes: titanium coated with ruthenium oxide as anode and stainless steel screen as cathode. The effect of operating parameters such as current density, oil concentration, flotation time and coagulant concentration, on the performance of the electroflotation cell was examined.…”

Electroflotation of emulsified oil in industrial wastes evaluated with a full factorial design

“…It was observed that the flocculant concentration does not have statistical significance (α floc = 0.4549) for oil removal, but it is important to the flocculation process (Hosny, 1992(Hosny, , 1996Ben Mansur and Chalbi, 2006). Therefore if we take the statistical point of view we can eliminate the X floc variable column presented in Table 2 and proceed through the 2 3 experimental factorial analysis.…”

“…Conventional biological processes are there ruled out due to the requirement of large plant and skilled technicians. In the electroflotation process, bubbles are generated by water electrolysis (Chen et al, 2002 andBen Mansur et al, 2006) to produce hydrogen and oxygen at the cathode and anode respectively. Compared with conventional flotation, electroflotation has many advantages.…”

“…Furthermore, the convenience of dosing control only by adjusting the current makes automation quite easy operation and offers simplicity and low capital and operating costs (Hosny et al, 1992Calvin et al, 1997. Recently, Ben Mansur and Chalbi (2006) examined the effect of operating parameters such as current density, oil concentration, flotation time and coagulant concentration on the performance of the electroflotation cell. Oil removal reached 70% under optimum conditions 75% with NaCl (3.5% by wt) and 99.5% with both NaCl and an optimum concentration of coagulant.…”

Electrochemical treatment of a graphitic forging lubricant effluent: The effect of chloride concentration and current density

“…Oil-in-water emulsions were also treated by electrocoagulation/electro-flotation processes by different authors (4,6,12,14,(27)(28)(29)(30). Nevertheless, the treatment of an effluent from forging operations to simultaneously break the oil in water emulsion and remove the graphite from the wastewater through electrocoagulation is still a matter of research.…”