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SiC Membranes for Produced Water Treatment
- 1. SiC Membranes for Produced Water Treatment: Case Study 1
- 2. Challenge • Discharge/Re-injection of Produced Water from oil production becoming difficult. • Oil wells maturing and water cut increasing • Tighter government regulations are being enforced for discharge of Produced Water.
- 3. Key contaminants in produced water stream • TSS, • Oil in Water (ppm) • TOG (residual total oil & grease) • ALL CAN CAUSE FOULING IN DOWNSTREAM EQUIPMENT. • CONTAMINATE GROUNDWATER WHEN PW IS DISCHARGED.
- 4. Existing Technologies 1. Oil & Water separation via free water knock out, demulsifiers 2. Skim tanks 3. Gas flotation 4. Filters (Wallnut Shell)
- 5. SEVERAL SHORTCOMINGS 1. More process steps 2. Heavy in footprint 3. Uses large amounts of chemicals and biocides 4. Require large amount of labor 5. High in OPEX AND CAPEX. 6. Removal of fine particles in conventional settling tanks take a long time. 7. Reduced efficiency of dispersed oil removal.
- 6. Our Solution SiC Ceramic Membranes Used in a wide variety industrial settings and make the perfect candidate when dealing with oil separation given their oil repelling characteristics. Unique hydrophilic properties leads to higher water fluxes -> continuous process flux for oil/water separation is between 200-2000 L/(m2 *h)
- 7. What can I remove? • Oil • Grease • Iron • TSS • Bacteria • Algae • Organic Matter
- 8. Why SiC Membranes • Oil repelling • Inert • Less Footprint • Longer lifetime • High Recovery • Self-cleaning All this filtration can be accomplished in 1 single step!
- 9. Why SiC over traditional methods POLYMERIC MEMBRANES ARE • Not as chemically or temperature resistant as not good (ecspecially at high temperatures of oil&gas industry) • Handle oil very poorly Polymeric membranes are • Expensive • Low water flux
- 10. 0.04 Micron 3,000 L/(m2 hr) 4,000 L/(m2 hr) 10,000 L/(m2 hr) >12,000 L/(m2 hr) FluxPore size 0.1 Microns 1 Microns 3 Microns Filtration capability
- 11. How it works feed flow is tangential to the surface of the membrane in order to sweep rejected particles and solutes away CROSS FLOW FILTRATION
- 12. CASE 1: Produced Water Treatment for Discharge Application: PW Treatment at off-shore oil platform in the North Sea Challenge: Customer cannot meet discharge limit of 30 ppm oil with conventional technology. Feed Water: Oil: 2500 ppm (highly emulsified) TSS: 75-200 mg/L Temperature: 2-17 °C Membrane: 0.04 micron pore size Process Data: Cross flow: 2m/s-2 stages TMP: 0.4 bar Permeate Flux: 200 LMH Permeate: Oil: <10 ppm TSS: <10 mg/L Case 1: Final Installation of H2O Systems SiC Membranes Case 1: Permeate-Feed-Concentrate
- 13. CASE 2: Produced Water Treatment for Re-Injection Application: PW Treatment for re-injection at on-shore production site. Challenge: Field trial in order to evaluate performance and feasibility of SiC membranes for PW filtration prior to re-injection. Feed Water: Oil: up to 60 mg/L TSS: up to 9 mg/L Temperature: 60 °C Membrane: 0.04 micron pore size Process Data: Cross flow: 1.2-1.6 m/s TMP: 0.7-1.0 bar Permeate Flux: 400-600 LMH Permeate: Oil:0-5 mg/L TSS: <0.03 mg/L Case 2: Test setup with automatic prefiltration (300 μm), CIP unit and H2O Systems MultiBrain membrane filtration unit Case 2: Samples from field trials Permeate (left), Feed (right)
- 14. Conclusion • Possible to remove oil & TSS from PW below required limits regardless of feed water oil concentration. • SiC membranes can replace conventional technologies with 1 step process (i.e. microflotation, walnut shell filters)
- 15. Next Steps • Meeting • Submit water analysis • Proposal and savings • Trial • Full systems intergration