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Oct 28, 2023 •321 likes •554 views

Phosphorus Recovery ry at the Stic ickney Water Reclamation Pla lant January 29, 2019 Background Nutrient Standards Development 2001 PRESENT IEPA developing defensible nutrient standards 2000 1998 2006 2015 IEPA requested to USEPA

  1. Phosphorus Recovery ry at the Stic ickney Water Reclamation Pla lant January 29, 2019

  2. Background

  3. Nutrient Standards Development 2001 – PRESENT IEPA developing defensible nutrient standards 2000 1998 2006 2015 IEPA requested to USEPA initiated IEPA/IPCB IEPA finalized the develop nutrient nutrient criteria promulgated the Illinois Nutrient Loss standards for the state development Interim P Rule Reduction Strategy 2011 (1 mg/L TP as 2000 IEPA renewed its monthly average USEPA finalized 14 efforts to develop for new and ecoregional nutrient criteria nutrient standards expanding recommendations for with 4 working WWTPs) streams and rivers groups Ecoregion VI, Corn Belt and Great plain: 0.076 mg/L TP and 2.18 mg/L TN

  4. District Nutrient Efforts – Strategic Plan for Resource Recovery and Sustainability 2011 2002 • Informed IEPA on steps: Formed Nutrient 2013 − Task Force to To biologically remove P u sing Converted all SWRP to identify needs existing infrastructure 2005 EBPR configuration − Recover P where possible Awarded contract for Conducted pilot nutrient − To work within District’s long removal test for a WERF construction of a P term strategic plan on resource project recovery facility at SWRP recovery and sustainability 2012 2007-08 Formed a District-wide Incorporated Conducted full scale study at Egan Phosphorus Task Force to nutrient WRP using chemical P removal study and implement of EBPR standards method Full-scale test in one battery at into master the Stickney WRP plans 2014 2001 – PRESENT New NPDES permit Actively participating in IEPA Nutrient Standards development with special condition for new P limit to be met by 2018

  5. P Removal l from Main instream

  6. Sti Stickney Water Recla lamation Pl Plan ant • Serves 2.38 million people • Flows: − Avg Design Capacity: 1,200 MGD − Average 2014-16: 700 MGD • 4 aeration batteries − 8 tanks/battery − 4 passes/tank − 96 circular secondary clarifiers Battery B Battery A Battery D Battery C

  7. Conversion for EBPR (AAnO) ) at t th the St Stickney WRP PE P4 P3 P2 P1 Aerobic zone Mixing Channel NS RAS Channel Anaerobic zone Influent Channel Anoxic zone EW RAS Channel RAS

  8. [TP] @ Outfall, Battery D (mg/L) 0.00 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60 1.80 May-12 Jun-12 Jul-12 Aug-12 Outfall TP: 1.16 mg/L Sep-12 PE TP: 4.7 mg/L Oct-12 Nov-12 Sti Dec-12 tickney EBPR Progress – Monthly Means Jan-13 Feb-13 Mar-13 Apr-13 May-13 Jun-13 Jul-13 Aug-13 Sep-13 Oct-13 Nov-13 ST Plant Outfall TP Dec-13 Jan-14 Feb-14 Mar-14 Apr-14 May-14 Jun-14 Jul-14 PE WEIGHTED TP Aug-14 Sep-14 Outfall TP: 0.86 mg/L Oct-14 PE TP: 7.6 mg/L Nov-14 Dec-14 Jan-15 Feb-15 Mar-15 Apr-15 May-15 Jun-15 Jul-15 Aug-15 Sep-15 Oct-15 Nov-15 Dec-15 Jan-16 Feb-16 Mar-16 Apr-16 May-16 0.00 2.00 4.00 6.00 8.00 10.00 12.00 14.00 16.00 [TP] @ PE (mg/L)

  9. P Recovery ry

  10. P Recovery Process Principle of Operation • Use of centrate and P-rich streams in WWTPs as feed • Streams pumped upward through the bottom of the reactor • Supersaturation conditions as driving force • Inject NaOH to raise pH to 7.7 • Inject MgCl2 at a molar ratio of 1.1:1 (Mg:P) • Spontaneous crystal nucleation occurs • Deposition on surface of crystals occurs as chemical driving force reduces • Crystals grow through this precipitation • Pellets recycled for further growth Recovered Product • High purity struvite (99.5% struvite) • Composed of Phosphorus, Nitrogen, and Magnesium MgNH 4 PO 4 •6H 2 O • Utilized as a slow release fertilizer – 5-28-0+10% • Enhanced efficiency fertilizer • Reduces risk of nutrient run-off

  11. P Recovery at SWRP Construction Dates • Startup of Facility: 5/2016 Anoxic/ • Operations test ongoing Primary Aerobic Clarifiers Anaerobic Description of SWRP Facility • 3 Pearl 10,000 reactors at SWRP Ferment- • Sized to accept both post-digestion centrate and ation pre-digestion centrate (from WASSTRIP) Thickening WASSTRIP • Estimated concentrations of orthoP in these streams: • Post-digestion Centrate: 50 – 200 mg/L Pearl • WASSTRIPATE: 58 – 75 mg/L Process Thickening (avg & max from benchscale experiments) (High P and Mg, low NH 3 ) Based on loading to facility, estimated production: • With post-digestion centrifuge alone: Anaerobic Dewatering 2,200 tons/year fertilizer Digestion • With post-digestion centrifuge + WASSTRIPATE 7,700 – 9,600 tons/year fertilizer

  13. Pearl Reactors Crystal Green Dewatering Storage & Screen & Bagging Dryer

  16. Pounds of f ort rthoP Removed Daily fr from Post-Digestion Centrate 4500 • Average: 1,800 lb/day 4000 • Represents ~10% of the orthoP load 3500 orthoP Removed (lbs/d) 3000 2500 2000 1500 1000 500 0

  17. Stickney EBPR Progress – Monthly Means Stickney Plant Effluent TP Primary Effluent TP 1.80 18.00 PE TP: 4.7 mg/L PE TP: 7.6 mg/L PE TP: 7.5 mg/L Outfall TP: 0.86 mg/L Outfall TP: Outfall TP: 1.16 mg/L 1.60 16.00 2017 – 0.64 mg/L 2018 – 0.30 mg/L 1.40 14.00 [TP] @ Outfall, Battery D (mg/L) 1.20 12.00 [TP] @ PE (mg/L) 1.00 10.00 0.80 8.00 0.60 6.00 0.40 4.00 0.20 2.00 0.00 0.00

  18. Chall llenges

  19. Seed In Injector System

  20. Cit itric Acid System Ext xtension

  21. Sulfu furic Acid System

  22. Chemicals Chemical Usage Titration 1 16000 2 1.5 14000 Base [mL] 1 12000 0.5 10000 0 Gallons/Week 6.6 6.8 7 7.2 7.4 7.6 7.8 pH 8000 6000 4000 2000 0 7/19 7/29 8/8 8/18 8/28 9/7 9/17 9/27 10/7 10/17 10/27 NaOH MgCl2

  23. Questions? Y. . Mwende Lefle ler le lefl flery ry@mwrd.org

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