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Rockdale Water Resources UASB Pretreatment Facility
Overview and Key Process SummarySeptember 2015
Facility Origins and Updates through 2013
UASB Process Basics
Operational Changes and Updates 2014 to present
2015 Performance Summary
Questions and Facility Tour
Agenda/Overview
UASB What is it?
Influent is high strength (COD >10,000 mg/l) with variable pH and NH3 levels
PreAcidification (PAC) = conditioning of influent (COD=> VFAs)pH in the low 5sCurrent target = 25%
UASB Reactor (Upflow Anaerobic Sludge Blanket)Acid/Methane Formers granularized around Ca core0.35 m3/day methane production per 1 Kg COD removedTarget COD removal = 90%Target effluent VFA < 2Target N/P residualsTarget Reactor pH/Alkalinity 6.8/mid 40s
UASB Process Basics
Facility Timeline SummaryOriginal 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
Project Basics
FlaresScreeningEQ Tank700,000 gallonsPAC Tank145,000 gallonsUASB Reactor540,000 gallons
UASB Biomass A Different Animal
Isolated Reactor and 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
SCOD Treatment
PAC DOA
UASB Reactor
Improve BioGas regulator 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
Questions?