Treatment facility technologies and costs for phosphorus removal
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Treatment Facility Technologies and Costs for Phosphorus Removal. Topics Covered. Technologies Disc Filtration Ballasted Setting Continuous BackWash Filter Membranes Levels of Treatment Costs Sizing. Disc filter Applications. Effluent Filtration Water Re-use.

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Presentation Transcript

Topics covered
Topics Covered Removal

  • Technologies

    • Disc Filtration

    • Ballasted Setting

    • Continuous BackWash Filter

    • Membranes

  • Levels of Treatment

  • Costs

  • Sizing


Disc filter applications
Disc filter Applications Removal

  • Effluent Filtration

  • Water Re-use

  • Phosphorus Reduction

  • CSO/SSO


Disc filter operation
DisC Filter operation Removal

  • Gravity Flow

  • Partially Submerged

  • Stationary Filter Discs

  • Automatic Operation

  • Continuous Operation


DISC FILTER INSTALLATION Removal

(Concrete)

Access platform elevation

Outlet weir

Inlet trough

Emergency bypass channel

Bypass weir

Filter effluent channel

Influent channel

FLOW


Disc filter performance t urbidity
DISC FILTER Performance (T Removalurbidity)



Oconomowoc wi tertiary polishing
Oconomowoc, WI RemovalTERTIARY POLISHING


Oconomowoc wi tertiary polishing1
Oconomowoc, WI RemovalTERTIARY POLISHING


Oconomowoc wi tertiary polishing2
Oconomowoc, WI RemovalTERTIARY POLISHING


Phosphorus levels technology
Phosphorus Levels & Technology Removal

  • Coagulant

1.0 mg/l

0.50 – 0.30 mg/l

0.30 – 0.20 mg/l

< 0.20 mg/l

  • Multipoint coagulant addition

  • Assisted with biological

  • Coagulant

  • Biological

  • Coagulant and Polymer ?

  • Disc Filter

  • Coagulant

  • Biological

  • Coagulant and Polymer

  • Disc Filter


VFD Removal

VFD

Coagulant

Polymer

Solids

Static Mixer

Filtered

Effluent

Coagulation

(3 - 5 min HRT)

Flocculation

(3 - 6 min HRT)

Disc filter

Coagulation/Flocculation

prior to Filtration

Secondary Clarifier Effluent


Pilot study clinton ma march april 2011
Pilot Study - Clinton, MA (March/April 2011) Removal

  • Disc Filtration used for total Phosphorus removal - <0.10 mg/L

  • Normal and Stressed Conditions

  • Ferric Chloride and Aluminum Sulfate Used


Clinton ma
Clinton, MA Removal


Ballasted settling process chemistry microsand
Ballasted Settling – RemovalProcess ChemistryMicrosand


Ballasted settling floc particle
Ballasted Settling – RemovalFloc Particle

~ 150 µm

Floc


VFD Removal

VFD

Coagulant

Polymer

Solids

Static Mixer

Flocculation

(3 - 6 min HRT)

Disc filter

Coagulation

(3 - 5 min HRT)

Ballasted Settling – Coagulation/Flocculation

Secondary Clarifier Effluent


Ballasted settling process schematic
Ballasted Settling – RemovalProcess Schematic

  • High Rate Clarifier,

  • 30-50 gpm/ft2


Ballasted settling hydro cyclone sludge separation
Ballasted Settling - RemovalHydrocycloneSludgeSeparation


Ballasted settling caldwell id pilot study results extended run with ferric chloride
Ballasted Settling – RemovalCaldwell, ID Pilot Study ResultsExtended Run with Ferric Chloride

  • Bio-P Selector Bypassed

  • Influent Total Phosphorus Increased from 0.3 mg/l to 3mg/l

  • Achieve 70 ppb Effluent Total Phosphorus


Continuous backwash filter
Continuous RemovalBackWash Filter

  • Regenerative Adsorptive

    Column

  • Coagulant Ferric Sulfate

    or Ferric Chloride


Continuous backwash filter1
Continuous Backwash Filter Removal

Biological

System

Secondary

Clarifier

Back Wash Filter

Headworks

RAS

WAS

Optional 2nd Pass

Digester

Solids

Dewatering

Reject Recycle


CONTINUOUS RemovalBACKWASH FILTER

Clean Water

Rapid Conditioning

Zone

Secondary Effluent

Reject Stream

HFO

Sand

Grain

Water

PO43-

Particles


Continuous backwash filter2
Continuous RemovalbackWash Filter

Fe

  • Hydrous Ferric Oxide-Coated Sand

    • Images from scanning electron microscopy

  • X-ray Flourescence

P



Membrane Bioreactor Removal

Treated water

Sludge

Water/Air

Flow

Membrane

Aeration

MEMBRANES



1.5 Removal

1.5

Membrane

PVDF Membrane

)

2

/ m

Choice “A”

Type B

1

1

12

東レ

東レ

BF014

BF014

Number of pore (10

0.5

0.5

クボタ

クボタ

0

0

0

0

0.2

0.2

0.4

0.4

0.6

0.6

0.8

0.8

Pore diameter (micron)

Pore diameter (micron)

MEMBRANES

3.0 micrometer

3.0 micrometer


MEMBRANES FLUX & PRESSURE RemovalComparison of Immersed Membrane Modules

Type B Flat Sheet

MLSS: 10,000 mg/l


Flat sheet membrane
FLAT SHEET MEMBRANE Removal

  • 0.08 mm nominal pore size

  • ~15 ft2 (~1.4m2) per element

  • 5.3’ High x 1.7’ Wide x 0.04’ Thick


Membrane operating modes filtration and relaxation mode

Relaxation (Intermittent Filtration) Removal

10 minute cycle: 9 minutes filtration followed by 1 minute relaxation and suspension of permeate (aeration is continuous)

Filtration

1 min

1 min

9 mins

9 mins

9 mins

1 min

Scour Aeration

MEMBRANE Operating Modes:Filtration and Relaxation Mode



Mbr bermuda
MBR - Bermuda Removal

  • Operating since Oct 2009

  • 0.25 MGD

  • Gravity Flow Permeate

  • Membrane Thickening


Membrane tanks mbr1
Membrane Tanks - MBR Removal

  • Two tanks – Five modules each

  • Membrane thickening: One tank, one module


Levels of treatment
LEVELs of Treatment Removal

Approximate

  • Disc Filtration > 0.15 mg/L TP

  • Ballasted Settling > 0.06 mg/L TP

  • Continuous Back Wash Filter < 0.06 mg/L TP

  • Membranes < 0.06 mg/L TP





O m costs
O & M Costs Removal

Membranes


Equipment sizing
Equipment Sizing Removal

  • Not always peak hour flow

  • 365 Day Average, Total P Limit

  • Blending Potential


Disc filtration take aways
Disc Filtration – Take Aways Removal

  • Tertiary Polishing Phosphorus Treatment

  • Phosphorus Reduction – Need Coagulation or Flocculation

    • In-pipe dosing not sufficient

    • Mixing, energy critical

  • Floc needs structural integrity

  • Use existing tankage (if possible)


Ballasted settling takeaways
Ballasted Settling - Takeaways Removal

  • Enhanced Floc Formation

  • Shorter HRT Higher Loading Rate

  • Mixing energy critical

  • Use existing tankage (if possible)


Continuous backwash filters takeaways
Continuous Backwash Filters - Takeaways Removal

  • Regenerative Adsorption Process

  • Hydrous Ferric Oxide-Coated Sand

  • Multiple Passes for Additional Treatment

  • Lower Coagulant Dose

  • Reject Stream

    • Possible Re-use

Fe

P


Membrane takeaways
MEMBRANE - Takeaways Removal

  • High level of treatment

    • P

    • Water reuse

    • Micropollutants

  • Energy intensive

  • High Capital Cost

  • Compact footprint

  • Membrane fouling critical

    • Aeration

    • Intermittent relaxation

    • Backwashing

    • Citric Acid


Questions
Questions? Removal


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