Treatment of Simulated Petrochemical Wastewater by Continuous Electrocoagulation/Ultrafiltration Process Presenter: Mahmood Siddiqui
Presentation Outline Introduction to the process Objectives of research Methodology Conclusion
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.
Three Phases of Pollutants Suspended solids and colloids. Immiscible Dissolved (organic and inorganic).
Electrocoagulation Involves the generation of in-situ coagulants by electrically dissolving either aluminum or iron ions.
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.
Membrane Processes Reverse Osmosis Nanofiltration Ultrafiltration Microfiltration
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.
Advantages of Ultrafiltration Consistent water quality. Low lifecycle cost through optimized energy use and minimum chemical requirements. Compact design resulting in small system footprint
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.
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
Experimental Setup
Experimental Setup
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
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
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
Sample Testing Oil: EPA Method 1664 Phenol: Spectrophotometer Analysis at 270 nm. COD: Method 5220 C, Closed Reflux Titrimetric Method Suspended Solids: Turbidimeter.
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.
Thank you Questions session