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The current study aimed to investigate the elimination of dyes from sewerage, using microfiltration membrane mechanism. Three dyes were applied, acid yellow-23, disperse blue -79 and acid orange -7. Experiments were performed with feed concentration (40 -120) ppm, feed flow rate (25 -65) l/h and time (0.25 -1.5) h. The membrane used ceramic membrane, constructed as a candle. It was discovered that water flow diminishes with an elevation in running time, feeding oil concentration and enhancing with elevation in the feed flow rate. In addition, it was determined that the elimination (rejection) rate of dyes enhances with elevation in the flow rate, and the elimination (rejection) rate diminishes as time passes. In cross flow microfiltration, the rejection concentration (concentrate) goes up as time passes, with high feed concentration and flow rate. It was also discovered that the modal infusion concentration declines with high feed concentration and working time. In addition, it was found that product rate goes down as time passes and with high feed concentration. Increasing feed concentration of dyes was associated with an increase in the concentration of rejecting solution. The highest elimination of disperse blue -79, Acid Yellow- 23 and acid orange -7, are 97%, 96.4% and 95.8%, respectively. The maximum recovery percentage of disperse blue - 79, acid yellow- 23 and acid orange -7are 57.7%, 58.5% and 59% respectively.

The removal of hexavalent chromium (Cr +6) ions from simulated wastewater was investigated by using batch electrocoagulation. The influence of several variables on the removal process was studied such as a type of electrodes, initial pH, initial concentration of Cr +6 ions, electrolysis time, sodium chloride concentration and current density. The experimental results showed that the removal efficiency of Cr +6 ions was more effective when using iron electrode comparing with the aluminium electrodes. The maximum removal of Cr +6 ions was 96.58% at pH 6.0, initial ion concentration 40 mg/L, electrolysis time 15 min, sodium chloride concentration 2 g/L, and the current density 30 mA/cm 2 .

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