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Moving Bed Biofilm Reactor Retrofit for Ammonia and Nitrate Removal. B&V SACWSD Lela Parsons, P.E. Greg Fabisiak Mark Maxwell, P.E. Joan Chavez. 2002 RMSAWWA / RMWEA ANNUAL CONFERENCE. Phase 2 Project Components.

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moving bed biofilm reactor retrofit for ammonia and nitrate removal

Moving Bed Biofilm Reactor Retrofit for Ammonia and Nitrate Removal

B&V SACWSD

Lela Parsons, P.E. Greg Fabisiak

Mark Maxwell, P.E. Joan Chavez

2002 RMSAWWA / RMWEA ANNUAL CONFERENCE

phase 2 project components
Phase 2 Project Components
  • Wastewater Collection System Master Plan
  • Utility Plan
  • Preliminary Design Report
  • Detailed Plans & Specifications
  • Contract Administration
utility plan goals
Utility Plan Goals
  • Provide information required by DRCOG and for SRF Funding
    • Evaluation of existing facilities
    • Population & flow projections
    • Environmental assessment to support FNSI
    • Alternative analysis and recommendations
    • Implementation and financial plans
    • Public participation
  • Determine necessary wastewater facilities for capacity and regulatory compliance through 2020
wm wwtp existing unit processes
WM WWTP Existing Unit Processes

East

Trickling

Filter

Final

Clarifiers

Chlorination

P

Flow Splitter

Discharge to South Platte River

Raw Wastewater

Dechlorination

Mechanical

Screenings

Primary

Clarifiers

Rotating

Biological

Contactors

P

P

Chlorination

West

Trickling

Filter

Final

Clarifier

Combined Primary & MBBR Sludge

Accelerated Air Drying of Dewatered Biosolids Prior to Ultimate Disposal of Class A Product

Degritting

Gravity

Thickener

Anaerobic

Digesters

Deskins

“Quick-Dry”

Filtration SystemTM

P

treatment issues
Treatment Issues
  • Regulatory Compliance
    • Reclassification of the South Platte River requires additional disinfection
    • Updated model of Segment 15 of the South Platte River resulted in imposition of effluent ammonia limit
  • Current and Future Water Quality Concerns
    • Dissolved oxygen
    • Ammonia
    • Nitrates
    • Nutrients
south platte dischargers

MWRD

Central Plant

SACWSD

Bear Creek

Clear Creek

Chatfield

Reservoir

River

South

Platte

Burlington

Ditch Diversion

Centennial

Sand Creek

Cherry Creek

Brighton

Littleton-

Englewood

Glendale

Future Sand Creek

Satellite WWTP

Segment 15

Segment 14

Segments 14 & 15 of South Platte River

(Not shown are non-point sources, diversion dams, reaeration structures etc.)

South Platte Dischargers
treatment issues con t
Treatment Issues (con’t)
  • WM WWTP Treatment Capacity
    • Surge in residential and commercial activity in the service area
    • Current treatment capacity of 4.4 mgd forecasted to only be sufficient through 2003
    • Limited room for additional expansion at the existing site
sacwsd future plan
SACWSD Future Plan
  • Complete Phase 2 expansion at WM WWTP by 2004
  • Phase 2 will provide capacity until 2008
  • New WWTP will be needed by 2009- could be regional WWTP or SACWSD WWTP
  • Upgrade WM WWTP when appropriate to meet future water quality regulations
wm wwtp expansion
WM WWTP Expansion
  • Increase treatment capacity from 4.4 to 7.0 mgd
  • Notice to proceed issued September 2002
  • Short-term - capacity expansion allows growth while new WWTP is designed and constructed
  • Long-term - WM WWTP will continue to serve the

southern area

of the District

phase 2 improvements
Phase 2 Improvements
  • Major Expansions
    • Secondary Treatment Process
    • Solids Handling Process
  • Additional Improvements
    • Replace Manual Bar Screen
    • Demolish RBCs
    • Upgrade Disinfection Facilities
    • Add Stand-by Power Capacity
    • Expand Administration Building/Garage
treatment alternatives
Activated Sludge

Anoxic/oxic basins

WAS Pumping Station and Blower Building

New Aerobic Sludge Handling

Centrifuge

Aerated sludge holding

Biological Nutrient Removal (future)

Fixed Film

MBBR

Anoxic/oxic basins

Blower Building

Additional Anaerobic Solids Processing

Convert secondary digester to primary digester

New secondary digester

Chemical Phosphorous Removal (future)

Post Denitrification (future)

Treatment Alternatives

Alternative A

Alternative B

alternative evaluation
Alternative A slightly less expensive

Alternative A more operationally complex- requires separate solids handling process

Alternative B will require chemical addition for future phosphorous removal

SACWSD has always utilized and prefers fixed film processes

Alternative Evaluation
selected alternative moving bed biofilm reactors
Fixed film process manufactured by Kaldnes

Employs high-density polyethylene plastic media, coarse bubble aeration, and sieves

Biofilm grows on inside of the media

Specific gravity

of 0.96

150 ft2/ft3 media

surface area

0.93 %/ft clean

water oxygen

transfer rate

Selected Alternative: Moving Bed Biofilm Reactors
design conditions
Design Conditions
  • 100 mg/L influent BOD
  • 2 anoxic and 2 oxic reactors in series
  • 60% fill in each reactor
  • Coarse bubble diffuser system in oxic reactors
  • Submersible propeller mixers in anoxic reactors
  • 4 mg/L summer DO concentration
  • 5 mg/L winter DO concentration
  • 200% internal recycle for nitrate removal
treatment requirements
East Plant Effluent

BOD5 reduction <10 mg/L

Total ammonia reduction <2 mg-N/L (complete nitrification)

Total nitrate reduction <10 mg-NO3/L (partial denitrification)

Blended Effluent (East and West Plant)

CBOD reduction <25 mg/L

Total ammonia reduction <10 mg-N/L

Treatment Requirements
selected alternative flow schematic
Selected Alternative Flow Schematic

East

Trickling

Filter

Anoxic

MBBR

Oxic

MBBR

Final

Clarifiers

Chlorination

P

P

Discharge to South Platte River

Raw Wastewater

Dechlorination

Mechanical

Screenings

Primary

Clarifiers

P

Flow Splitter

P

Chlorination

West

Trickling

Filter

Final

Clarifier

Combined Primary & MBBR Sludge

Accelerated Air Drying of Dewatered Biosolids Prior to Ultimate Disposal of Class A Product

Degritting

Gravity

Thickener

Anaerobic

Digesters

Deskins

“Quick-Dry”

Filtration SystemTM

P

Existing Facilities

Phase 2 New

Phase 2 Modified

operational issues
Operational Issues
  • Portion of primary effluent must be bypassed around existing trickling filter
    • Requires construction of a new flow splitter structure
    • Prevents hydraulic surcharging of underdrains
    • Assures sufficient soluble BOD for denitrification
    • Allows ETF pumping station to be taken out of service
  • Trickling filter snail accumulation
    • Installed an automatic, self-cleaning strainer with 1/8- inch openings at the ETF pumping station
total project costs
Engineer’s Construction

Cost Opinion

Low Bid Price

Difference Between High

and Low Bids

Total Project Costs

$13,283,000

$12,774,000

$475,300