Technology for the Treatment/Reuse of Refinery Wastewater

Transcription

1 Technology for the Treatment/Reuse of Refinery Wastewater Joseph Sebastian

2 Biological Treatment Typical Applications and Operating Conditions Designed primarily for removal of biodegradable organic matter, nitrogen and phosphorus compounds Normally applied after primary treatment where inert solids and oils are removed from the wastewater Used to achieve effluent BOD and TSS concentrations of 30 ppm or less Effluent COD concentrations are dependent upon the application. Page 2 Water Arabia:

3 Biological Treatment Principals of Operation Organic Chemicals Carbon Dioxide Bacteria Oxygen Nutrients Cell Mass Page 3 Water Arabia:

4 Biological Treatment Principals of Operation Influent Secondary Clarifier Effluent Air Diffusers Return Activated Sludge Waste Sludge Page 4 Water Arabia:

5 Market Dynamics - Background Industrial Wastewater Treatment of Refractory Organics Need for water conservation/sustainability Wastewater discharge regulations tightening Water shortages Existing technology not reliable / too costly Page 5 Water Arabia:

6 Needs Increased contaminants removal efficiency Existing or stricter discharge standards Reuse of wastewater: Reliable, small footprint Page 6 Water Arabia:

7 From PACT to MBR Alternatives PAC or GAC Reject Stream Aeration MOS Tank RO R/R Petro MBR Technology = Siemens O&G MBR Design Petro PAC MBR = Powdered Activated Carbon in Aeration + MOS Tank EcoRight MBR = Granular Activated Carbon in Aeration Tank ONLY Page 7 Water Arabia:

8 Advantages Carbon assisted MBR Advantages Small footprint High COD and TOC removal efficiency Bio-refractory organics removal No gravity clarification More stable less upsets Wastewater reuse pretreatment Lower capital, operating & maintenance costs for equivalent effluent quality Page 8 Water Arabia:

9 Saudi Aramco Powdered Activated Carbon PAC (MBR) Testing Complex refinery WW Highly variable High concentrations of refractory organics Effluent compliance difficult Side-by-side test with MBR Page 9 Water Arabia:

10 PAC MBR Pilot Test Unit Page 10 Water Arabia:

11 Page 11 Water Arabia:

12 COD Influent and Effluent Refinery WW - COD Removal PAC Petro MBR Feed COD Effluent COD COD, mg/l /19/ /9/ /29/2006 1/18/2007 2/7/2007 2/27/2007 3/19/2007 Date Page 12 Water Arabia:

13 Test Results Feed MBR Removal % PAC MBR Removal % BOD ~400 mg/l (~4 mg/l) 99% (~5 mg/l) 99% COD ~750 mg/l (151 mg/l) 81% (46 mg/l) 92% TOC ~200 mg/l (27 mg/l) 86% (11 mg/l) 94% Page 13 Water Arabia:

14 PAC MBR Results - Summary Excellent refractory removal Excellent effluent quality feed to an RO Very stable No MBR membrane fouling Significant abrasion Up to 40% reduction in life expectancy Page 14 Water Arabia:

15 New 125X Membrane Abrasion* 30 days 30 days 125X 500X * Improvements in membrane materials have reduced, but not eliminated, membrane abrasion. Page 15 Water Arabia:

16 Saudi Aramco invented & patented GAC MBR All advantages of PAC MBR Solves the problems GAC vs. PAC GAC can be pre-separated from membrane tank No membrane abrasion from carbon contact GAC attrition is minimized Page 16 Water Arabia:

17 EcoRight MBR How it works Upstream system(s) Granular Aeration Activated Tank Carbon Isolation device MOS Tank Membranes Mixing device Effluent Wastewater Sludge waste Return Line Sludge waste Biofilm Page 17 Water Arabia:

18 Anoxic Tank Aerobic Tank MOS Filtrate Control Panel EcoRight MBR Pilot Unit Page 18 Water Arabia:

19 EcoRight TM MBR Pilot Samples Page 19 Water Arabia:

20 EcoRight TM MBR Pilot Testing COD Removal Performance Following Acclimation COD Removal Performance COD, mg/l Influent COD Effluent COD Days Following Acclimation Page 20 Water Arabia:

21 EcoRight TM MBR Pilot Testing Oil and Grease Removal Following Acclimation Oil and Grease Removal Performance Following Acclimation Oil and Grease, mg/l Days Following Acclimation Influent Oil and Grease Effluent Oil and Grease Note - EcoRight MBR appears to respond much better to higher influent oil concentration than conventional biological treatment systems Page 21 Water Arabia:

22 - EcoRight TM MBR Pilot Testing RO (Single Pass) Performance* Date Data Collection Time HH:MM Product Flow (gpm) Reject Flow (gpm) Cartridge Filter Inlet Pressure (psig) Page 22 Water Arabia: Cartridge Filter Outlet Pressure (psig) RO Inlet Pressure (psig) RO Outlet Pressure (psig) Feed TDS Readout (ppm) Product TDS Readout (ppm) 06/28/ /29/ /30/ /08/ /03/ /04/ /05/ /06/ /12/ /13/ /14/ /16/ /19/ /20/ /21/ * Operating since June 28th with one maintenance cleaning cycle.

23 EcoRight TM MBR Testing Refractory organic feed Same operational advantages as PAC MBR MBR no clarifier Improved refractory removal efficiency Stable Operations - GAC acts as a buffer, adding stability to the system operation Lower EPS concentrations Biological regeneration of the GAC Page 23 Water Arabia:

24 Development together with Saudi Aramco Field pilot confirmation Completed at the Ras Tanura Refinery and Juaymah Gas Plant in Saudi Arabia (both SA facilities) Applications (Refinery/ Gas plant) Eliminate /reduce surface discharge Reuse WW reduce desalination costs Reduce groundwater consumption Page 24 Water Arabia:

25 Thank you for your attention!