Technology Update Phosphorus Removal - WWOA.org Affairs...Phosphorus Removal Samuel Jeyanayagam,...
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Technology Update Phosphorus Removal
Samuel Jeyanayagam, PhD, PE, BCEE
Vice President/Senior Principal Technologist
CH2M HILL
2014 Wisconsin Government Affairs Seminar
Marriott Madison West, Madison, WI
27 February 2014
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Take Home Messages
• Many approaches to reach low effluent P using proprietary & non-proprietary systems
• Generally requires multi-stage treatment entailing some form of clarification, filtration, & chemical addition
• Highly effective solids capture is central
• Removing soluble non-reactive P (sNRP) is most challenging (Typical value ≈ 0.01 mg/L)
• Reverse Osmosis (RO) is effective in removing sNRP but is costly
• Every plant is different. Site-specific testing can be very valuable. CAUTION: Pilot data may not scale up.
• Final technology selection should be based on an unbiased evaluation of available options.
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NitrogenPhosphorus
Algae Bloom
Decay
Water Quality Impacts
Blue Baby
Syndrome
Public
Health
Impacts
Organic
Matter
Dissolved Oxygen Depletion
Nutrients
The Need to Control Nutrient Discharges
Toxicity
Poor water quality also limits
fishing & recreational opportunities.
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The Wisconsin Scene
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http://www.jsonline.com/news/wisconsin/96995454.html
http://dnr.wi.gov/news/mediakits/mk_phosphorus.asp
In 2014, 192 new waterbodies proposed
for inclusion in impaired list
Of these 65% exceed TP criterion
2012 Listing
• No. of discharge permits ≈ 540
• Current limit for many plants: 1.0 mg/L TP
• >50% of the plants will have limits approaching 0.1 mg/L TP or less
• Statewide compliance cost estimate
– Generic: $1.3 to 1.8 billion
– Accrual site-specific cost reported: 1.1 to 2.4 times
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Phosphorus SpeciationTerminology
Particulate P
Soluble Reactive P
(sRP)
Colloidal P
TP
Soluble
Non-reactive P
(sNRP)
Ortho-P
EBPR: Enhanced biological P removal
Chem-P: Chemical P removal
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Phosphorus Removal Alternatives
• No “One-size-fits-all”
• Careful evaluation of competing
technologies based on site-
specific factors
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Phosphorous Removal
Two methods available for additional P removal:
• Chemical
• Biological
Basic concept:
Sol. Reactive P Particulate P(sRP)
Phosphorus removal occurs when sludge is wasted
Phosphorus removal occurs in all WWTPs due to metabolic requirements;
• Secondary sludge contains about 2% P by weight
• Up to 3 mg/L P removed - inadequate for environmental protection
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Enhanced Biological P Removal (EBPR) Mechanism
Anaerobic ZoneDO, NO3
Aerobic (DO)
P Release
PHB
Polyphosphate
CO2 + H2OO2
Cell
Synthesis
Energy (Ed)
Excess
P Uptake
PHB: Poly-β-hydroxybutyrate
Energy Investment = Ei Energy Dividend (Ed)= 24 – 36 x Ei
Why does EBPR work
?
Rapidly
Biodegradable
Substrate (VFAs)
PHB
Poly-
phosphate
Energy (Ei)
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Introducing Phosphorus Accumulating Organisms in Person!
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Chemical
HMO
HMO
HMOHMO
HMO
P
P P
P
PP
P
P
Chemical
Adsorbed
Soluble P
Entrapped
Particulate P
HMO Floc
HMO Formation HMO + Psol + Ppart
Formation
Current Understanding of the Chem - P Removal Mechanism
Fe & Al salts are most commonly used.
Recent plant data do not support the long-held view that P is precipitated.
Actual mechanism involves:
1. Reaction with alkalinity to form hydrous metal oxide (HMO) floc
2. Soluble P adsorbs to HMO reactive sites
3. Co-precipitation: HMO enmeshes colloidal & Particulate P
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Conventional P Removal
EBPR
Chem-P Removal
Anaerobic Aerobic
RAS
Chemical
(Optional)
Aerobic
RAS
ChemicalChemical
Disinfection
Disinfection
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What is Tertiary Treatment?
• Tertiary treatment follows final clarifiers & typically entails
– Clarification
– Filtration
– Chemical addition
Aeration
Basin
RAS
DisinfectionTertiary
Treatme
nt
ChemicalChemical
PC SC
• Need to understand
– Chemical reactions involved
– Effluent P speciation & solids capture
– Available technologies and their capabilities
– Integration challenges & plant-wide impacts
– Wet Weather operations
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Achieving Low Effluent P Requires Higher than Stoichiometric Me/P Ratio
0.001
0.01
0.1
1
10
0 1 2 3 4 5 6 7 8
Feadded/Pini ratio [mole/mole]
Resid
ual so
lub
le P
[m
g/L
]
3.5 mg/L
0.07 mg/L
* Szabό, A., I. Takács, S. Murthy, G. T. Daigger, I. Licskό, and S. Smith, “Significance of Design and
Operational Variables in Chemical Phosphorus Removal,” Water Environment Research, 80, 407-416, 2008.
In typical wastewater with sufficient mixing and alkalinity:
• Initial rapid reaction; significant P removal. Stoichiometric Me:P ratio
• Removal of the remaining P is more difficult; reaching low effluent P requires high Me:P ratio
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Achieving Very Low Effluent TP Requires Analysis of Constituents
Constituent
Secondary Effluent TP
(0.4 mg/L as P)
Limitation
Typical Very Low Plant Effluent TP1
(0.04 – 0.055 mg/L as P)
Soluble Orthophosphate
0.02 Solubility of Metal Phosphate
0.01-0.02
Particulate 0.3 (at 10 mg/L TSS)
Solids Capture 0.01 (at 2 mg/L TSS)
Colloidal 0.08 Solids Coagulation and Filtration
0.02-0.025
Based on Data From Rock Creek WWTPs
Every plant is unique!
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Impact of Effluent TSS
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Efficient Solids Capture is Crucial
Microfiltration
0.001µ 0.01µ 0.1µ 1.0µ 10µ 100µ 1000µ
Dissolved
Organics Bacteria
GiardiaViruses
Na/Cl
Colloids
Ultrafiltration
Nanofiltration
Reverse
Osmosis
Ca/Mg
Crypto
Turbidity
Cloth Media
Soluble P
Particle Filtration
Particulate P0.45 µ
Achieving the lowest
possible TP requires almost
complete solids removal.
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Conventional Filtration
• Filter Types
– Granular media
– Cloth filters
– Moving bed filters
– Traveling bridge filters
• Conventional filtration following EBPR or Chem-P removal can achieve 0.1 mg/L TP
• Often called the Limit of Technology
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To reach <0.1 mg/L TP, Tertiary Chemical Addition & Solids Capture Required
• Potential technologies
– Tertiary clarification + filtration
– Two-stage filtration
– Low-pressure membrane filtration
– Reverse osmosis
– Adsorption
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Tertiary Clarification
• What is it?
– Clarifier operating on secondary effluent
– Metal salts and polymer
– Can use Actiflo® or Densadeg®
• What’s the benefit?
– Additional sol. P removal
– Removal of colloidal P (coagulation/flocculation)
– Improved particulate P removal, but not for the reasons one might think!
• TP / TSS ratio is reduced through “dilution” with metal hydroxide floc
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Rock Creek AWTF, Hillsboro, OR(2-Point Chem. Addition + Tertiary Clarification + Filtration)
Aeration Basin
RAS
Alum
Disinfection
Alum
Tertiary
Clarifier Tertiary
Filter
To
Digester
0.41
mg P/L
0.1
mg P/L
0.04
mg P/L
• Permit limit: 0.07 mg/L TP (Monthly median)
• Minimum soluble phosphorus: 0.01 to 0.02 mg/L (sNRP )
SCPC
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Tertiary Filtration
• Proprietary & non-proprietary
• Two-stage filtration
– Granular media
– Moving bed
– Continuous-backwash
– DynaSand® D2 (Parkson)
– Blue PRO® (Blue Water Technologies)
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Blue PROTM Reactive Filter
• Sol. P adsorbed by hydrous ferric oxide (HFO) coated sand in a moving bed filter
• HFO & adsorbed P are abraded from the sand & wasted
• Sand re-coated with fresh HFO
Sand Grain
HFO Coated SandHayden, ID Pilot Testing
• Average results:
– Influent 0.69 mg/L TP
– Effluent 0.011 mg/L TP
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Side-by-Side Comparison of Four Technologies
Zenon Zeeweed 500 UF membrane
Dual Stage Blue PRO
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Parkson DSD2 Advanced Filtration System
USFilter Trident HS 1
Side-by-Side Comparison of Four Technologies
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Side-by-Side Comparison of Four Technologies
0.004
0.065
0.006
0.047
0.002
0.005
0.002
0.019
0.015
0.014
0.011
1 2 3 4
0.047 mg/L TP
0.021
0.084
0.019
sRP
sNRP
Part. P
0.001 mg/L
Part. P
Zenon UF Blue PRO
Parkson Trident
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Innisfil, Ontario Pilot Testing
• Head-to-head pilot testing
– ZENON tertiary ultrafiltration (UF)
– Blue PRO reactive filtration
– ACTIFLO
– Parkson DynaSand D2
Component
mg/L
Zenon UF Blue PRO Actiflo DynaSand
TP 0.015 0.015 0.031 0.022
Sol. P 0.012 0.013 0.018 0.016
Part. P 0.003 0.002 0.013 0.006
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Waste Solids
Magnetite
Recycle
Magnetite
Recovery
Coagulant Polymer
Magnetite
Feed Sludge Recycle
Co-MagTM
Magnetite Ballasted Technology
Magnetite• Fully oxidized iron ore (Fe3O4)
• Doesn’t rust or degrade
• Inert
• Non-abrasive (10 - 30 microns)
Favorable Properties• Spec. gravity: 5.2
• Hydrophobic: affinity to embed in floc
• Magnetically retrievable
• Readily available ~30¢/lb
Secondary
EffluentTertiary
Effluent
Effl. TP achievable ~ 0.02 mg/L
Magnetite consumption: < 10 lb/mgd
Evoqua Water Technologies
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What About Membrane Bioreactors?
• Activated sludge with membrane solids separation
• Metal salt added to remove P
• Low-pressure membranes (MF or UF) block biomass and precipitates
• Fine line between removing all ortho-P and leaving just enough for bacterial metabolism
• ZENON MBR pilot system averaged 0.021 mg/L TP (range 0.013 to 0.029 mg/L TP)
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Comparison of Tertiary Treatment Technologies (0.01 mg/L Effl. TP)
Unit Process sRP sNRP pP
Metal salt addition +++ + ++
Sedimentation & Ballasted
sedimentation
- - +
Direct filtration - - ++
Sedimentation-filtration - - +++
2-stage filtration - - ++++
Reactive filtration (Fe oxide coated
sand)
+++ ? +++
Membrane filtration - - +++
Reverse osmosis ++++ +++ ++++
WERF
sRP
pP
sNRP
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• Impact on UV disinfection
• Increased sludge production
• Alkalinity consumption
• Good upstream treatment is essential:– Management of recycle loads (e.g. nutrient recovery)
– Additional clarification capacity
• Wet weather operation – unpredictable wastewater
characteristics– Hold on to the bugs (e.g. step-feed, proper clarifier design, SVI
control, etc.)
– Excess wet weather flow management/treatment
• Redundancy
Operational Aspects
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Take Home Messages
• Effluent TP is highly variable, even from best
performing plants.
• Many approaches to reach low effluent P
• Generally requires multi-stage treatment entailing some
form of clarification, filtration, & chemical addition
• Highly effective solids capture is critical
• Removing soluble non-reactive P (sNRP) is most
challenging (Typical value ≈ 0.01 mg/L)
• RO is effective in removing sNRP but is costly
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Take Home Messages
• Every plant is different. Site-specific testing can be
very valuable. CAUTION: Pilot data may not scale up.
• Final technology selection should be based on an
unbiased evaluation of available options.
• Wastewater treatment plant is like a spider web!
• Do not take chances when pushing the envelop –
provide ‘safety net’
• How low can we go……..it depends!
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In Closing….
Influent
6.0 mg/L 3.0 1.0 0.5 0.1 ?
Second.
TreatmentEBPR & Chem-P
RemovalConventional
Filter
Tertiary Treatment
Lowest attainable TP will depend on sol. non-reactive P.
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Disclaimer
• Not all data presented herein were generated by CH2M HILL. Original sources are not acknowledged.
• This presentation does not endorse any system.
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Questions?
So near, yet so far!
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Technology Update Phosphorus Removal
Samuel Jeyanayagam, PhD, PE, BCEE
Vice President/Senior Principal Technologist
CH2M HILL
P: 703.376.5268
E-Mail: [email protected]
2014 Wisconsin Government Affairs SeminarMarriott Madison West, Madison, WI
27 February 2014