Separation of oil from OW emulsion by electroflotation technique

الملخص EN

Dilute emulsified oil in water (50-500 ppm) was removed by electrocoagulatin and electro flotation process.

Effects of various parameters such as current density, initial pH, sodium chloride concentration, different electrodes material, gap, temperature, electrodes surface area, and treatment time on the removal efficiency were studied in batch and continuous mode.

It was found that the higher removal efficiency (99 %) achieved at pH of 7.5 for Al / Al electrodes while for iron electrodes at pH 8 in the batch mode.

The removal efficiency increased and the treatment time decreased with increasing the current density and decreasing the gap distance between electrodes.

The removal efficiency was (99 %) at 10 min for Al / Al electrodes, (98.6 %) at 12 min for Al / St.

St.

electrodes, and (97.4 %) at 12 min for Fe / St.

St.

electrodes.

The present results showed that the best temperature was 60ºC .The best concentration of sodium chloride was found to be (400 ppm) when the oil concentration was (500 ppm).

Also it was found that a vertical Al / Al electrode was the best type with an electrical energy consuming (3.36 kWh / m3).

In the continuous experiments, the removal efficiency enhanced with increasing flow rate.

A multiple linear regression model was used in order to relate experimental data to a statistical model with a correlation coefficient of (0.909) and variance (0.827).