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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
  • Technologies
    • Disc Filtration
    • Ballasted Setting
    • Continuous BackWash Filter
    • Membranes
  • Levels of Treatment
  • Costs
  • Sizing
disc filter applications
Disc filter Applications
  • Effluent Filtration
  • Water Re-use
  • Phosphorus Reduction
  • CSO/SSO
disc filter operation
DisC Filter operation
  • Gravity Flow
  • Partially Submerged
  • Stationary Filter Discs
  • Automatic Operation
  • Continuous Operation
slide5

DISC FILTER INSTALLATION

(Concrete)

Access platform elevation

Outlet weir

Inlet trough

Emergency bypass channel

Bypass weir

Filter effluent channel

Influent channel

FLOW

phosphorus levels technology
Phosphorus Levels & Technology
  • 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
slide12

VFD

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)
  • Disc Filtration used for total Phosphorus removal - <0.10 mg/L
  • Normal and Stressed Conditions
  • Ferric Chloride and Aluminum Sulfate Used
slide17

VFD

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 – Process Schematic
  • High Rate Clarifier,
  • 30-50 gpm/ft2
ballasted settling caldwell id pilot study results extended run with ferric chloride
Ballasted Settling – Caldwell, 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 BackWash Filter
  • Regenerative Adsorptive

Column

  • Coagulant Ferric Sulfate

or Ferric Chloride

continuous backwash filter1
Continuous Backwash Filter

Biological

System

Secondary

Clarifier

Back Wash Filter

Headworks

RAS

WAS

Optional 2nd Pass

Digester

Solids

Dewatering

Reject Recycle

slide24

CONTINUOUSBACKWASH FILTER

Clean Water

Rapid Conditioning

Zone

Secondary Effluent

Reject Stream

HFO

Sand

Grain

Water

PO43-

Particles

continuous backwash filter2
Continuous backWash Filter

Fe

  • Hydrous Ferric Oxide-Coated Sand
    • Images from scanning electron microscopy
  • X-ray Flourescence

P

slide27

Membrane Bioreactor

Treated water

Sludge

Water/Air

Flow

Membrane

Aeration

MEMBRANES

slide29

1.5

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

slide30

MEMBRANES FLUX & PRESSUREComparison of Immersed Membrane Modules

Type B Flat Sheet

MLSS: 10,000 mg/l

flat sheet membrane
FLAT SHEET MEMBRANE
  • 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)

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
  • Operating since Oct 2009
  • 0.25 MGD
  • Gravity Flow Permeate
  • Membrane Thickening
membrane tanks mbr1
Membrane Tanks - MBR
  • Two tanks – Five modules each
  • Membrane thickening: One tank, one module
levels of treatment
LEVELs of Treatment

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

Membranes

equipment sizing
Equipment Sizing
  • Not always peak hour flow
  • 365 Day Average, Total P Limit
  • Blending Potential
disc filtration take aways
Disc Filtration – Take Aways
  • 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
  • Enhanced Floc Formation
  • Shorter HRT Higher Loading Rate
  • Mixing energy critical
  • Use existing tankage (if possible)
continuous backwash filters takeaways
Continuous Backwash Filters - Takeaways
  • 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
  • High level of treatment
    • P
    • Water reuse
    • Micropollutants
  • Energy intensive
  • High Capital Cost
  • Compact footprint
  • Membrane fouling critical
    • Aeration
    • Intermittent relaxation
    • Backwashing
    • Citric Acid
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