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UASB Overview 8.30.15 Final
- 1. Rockdale Water Resources –UASB Pretreatment Facility Overview and Key Process Summary September 2015
- 2. • Facility Originsand Updates through 2013 • UASB Process Basics • Operational Changes and Updates 2014 to present • 2015 Performance Summary • Questions and Facility Tour Agenda/Overview
- 3. UASB – Whatis it?
- 4. • Influent ishigh strength (COD >10,000 mg/l) with variable pH and NH3 levels • PreAcidification (PAC) = conditioning of influent (COD=> VFAs) – pH in the low 5’s – Current target = 25% • UASB Reactor (Upflow Anaerobic Sludge Blanket) – Acid/Methane Formers granularized around Ca core – 0.35 m3/day methane production per 1 Kg COD removed – Target COD removal = 90% – Target effluent VFA < 2 – Target N/P residuals – Target Reactor pH/Alkalinity 6.8/mid 40s UASB Process Basics
- 5. Facility Timeline Summary •Original Project (1994) – PreAcidification Tank (PAC), Reactor and ancillary chemical feed building • 2001 – Flow Equalization Tank and Rotoscreen • 2001 – UASB Reactor Feed Header Modification • 2004 – PAC tank rehabilitation (upper 2 rings) • 2015 – Recycle Stream Separation/Piping Mods/Dual Chem Feed Systems
- 6. Project BasicsFlares Screening EQ Tank 700,000 gallons PACTank 145,000 gallons UASB Reactor 540,000 gallons
- 8. UASB Biomass –A Different Animal
- 9. • Isolated Reactorand PAC recycle returns • Added independent dual N/P feeds to PAC/Reactor • DOA control drives PAC process changes • Reactor N/P residuals drive UASB process changes Operational Changes 2014 - Present
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- 13. • Improve BioGasregulator controls • Trial MagOx (less hazardous alkalinity control) • Restore/rebuild original PID control loop concepts • Replace existing PAC tank • Update/improve odor control • Install pigging bypass piping (to EQ vs Quigg) Operational Changes Moving Forward
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