1. Treatment of Simulated Petrochemical Wastewater by Continuous Electrocoagulation/Ultrafiltration Process
Presenter:
Mahmood Siddiqui

2. Presentation Outline Introduction to the process
Objectives of research
Methodology
Conclusion

3. Petrochemical Wastewater
Petrochemical wastewater is considered to be complex and hard to treat.
Characteristics highly industry specific.
Typical refinery wastewater characteristics used in the study.

4. Three Phases of Pollutants
Suspended solids and colloids.
Immiscible
Dissolved (organic and inorganic).

5. Electrocoagulation
Involves the generation of in-situ coagulants by electrically dissolving either aluminum or iron ions.

6. Benefits of Electrocoagulation
EC requires simple equipment and is easy to operate.
Sludge formed by EC tends to be readily settable and easy to de-water, because it is composed of mainly metallic oxides/hydroxides.
It removes the smallest colloidal particles, because the applied electric field sets them in faster motion, thereby facilitating the coagulation.
EC produces effluent with less total dissolved solids (TDS) content as compared with chemical treatments.

7. Membrane Processes Reverse Osmosis Nanofiltration Ultrafiltration
Microfiltration

8. Ultrafiltration
A membrane separation process, driven by a pressure gradient, in which the membrane separates components of a liquid larger than a specific molecule size.

9. Advantages of Ultrafiltration
Consistent water quality.
Low lifecycle cost through optimized energy use and minimum chemical requirements.
Compact design resulting in small system footprint

10. Objectives
Combined use of electrocoagulation and ultrafiltration processes has not yet been tested for petrochemical wastewater.
Continuous flow has also not been tested for Electrocoagulation process.

11. Schematic Diagram of Electrocoagulation/Ultrafiltration Process.
Experimental Setup
Ammeter
+ -
DC Power Supply A
Rheostat
Synthetic Wastewater
Feed
Pump
Magnetic Stirrer Controller
Electrodes
Submerged
Membrane
Sludge
Schematic Diagram of Electrocoagulation/Ultrafiltration Process.
Treated Water

12. Experimental Setup

13. Experimental Setup

14. Schematic Diagram of Electrocoagulation/Ultrafiltration Process.
Experiments (1-16)
Ammeter
+ -
DC Power Supply A
Rheostat
Synthetic Wastewater
Feed
Pump
Magnetic Stirrer Controller
Electrodes
Submerged
Membrane
Sludge
Schematic Diagram of Electrocoagulation/Ultrafiltration Process.
Treated Water
Experimental Parameters:
Current Density: 5, 15, 30, 50 mA/cm2
Contact Time: 5, 10, 20, 30 minutes
No Electrolyte
Phenol: 75 ppm
Oil: 10 ppm
SS: 100 ppm

15. Schematic Diagram of Electrocoagulation/Ultrafiltration Process.
Experiments 17 & 18
Ammeter
+ -
DC Power Supply A
Rheostat
Synthetic Wastewater
Feed
Pump
Magnetic Stirrer Controller
Electrodes
Submerged
Membrane
Sludge
Schematic Diagram of Electrocoagulation/Ultrafiltration Process.
Treated Water
Experimental Parameters:
Optimum combination of Current Density and Contact Time from first 16 experiments.
Electrolyte 1 and 3 gm
Phenol: 75 ppm
Oil: 10 ppm
SS: 100 ppm

16. Experimental Parameters:
Experiments 19 & 24
Experimental Parameters:
Optimum combination of Current Density, Contact Time and Electrolyte from first 18 experiments.
Ammeter
+ -
DC Power Supply A
Rheostat
Synthetic Wastewater
Feed
Pump
Magnetic Stirrer Controller
Electrodes
Submerged
Membrane
Sludge
Schematic Diagram of Electrocoagulation/Ultrafiltration Process.
Treated Water
Increased Pollutant Concentration:
Phenol: 150 and 300 ppm
Oil: 20 and 30 ppm
SS: 200 and 300 ppm

17. Sample Testing Oil: EPA Method 1664
Phenol: Spectrophotometer Analysis at 270 nm.
COD: Method 5220 C, Closed Reflux Titrimetric Method
Suspended Solids: Turbidimeter.

18. Conclusion
A new method involving combined use of Electrocoagulation and Ultrafiltration will be tested for simulated Petrochemical industry wastewater under continuous flow.
Different levels of current density, contact time, electrolyte concentration and pollutant level will be tested.
Standard tests will be used to analyze the treated samples collected at various time intervals.

19. Thank you
Questions session