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When is Enough, Enough? - PowerPoint PPT Presentation


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When is Enough, Enough?. Opening Remarks and Comments. Presentation Purpose. History of Environmental Compliance Actions Existing Deicing Facilities, Collection Systems and Operating Protocols System Improvements Current Conceptual Consideration (Stormwater Management and Treatment).

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Presentation Transcript
slide4
History of Environmental Compliance Actions

Existing Deicing Facilities, Collection Systems and Operating Protocols

System Improvements

Current Conceptual Consideration (Stormwater Management and Treatment)

Presentation Setup and Approach

slide6

Structure

Allegheny County Airport Authority incorporated in November 1999to succeed the Allegheny County Department of Aviation

slide8
Hub Focus City O&D

Current Operating Role

slide9

Airfield Layout

Runways (4)

slide10

Airfield Layout

Terminal Buildings

slide11

Airfield Layout

Cargo, Military Bases, FBO & Maintenance

slide18

1998 Administrative Order

“. . . Cease unauthorized discharges of deicing/anti-icing chemicals . . .”

slide20

Overall

ACAA Deicing Pad

Military Deicing Pad

Cargo

Defrosting Area

YankeeNorth

Charlie

FBO

YankeeSouth

911th

Echo

Sierra

PANG

slide28
Echo and Charlie Pads

Dedicated to deicing

12 pedestal-mounted booms

Icehouse

Collection systems

Initial Pads

$10MM

slide29
Echo Pad

Second set of trench drains

Echo and Charlie

Type II fluid system

1994 Improvements

$12.3MM

slide30
Charlie Pad

Trench drain modifications

New pavement

Piping and above-ground storage for impacted runoff

1998 Improvements

$13.3MM

slide31
Echo and Charlie Pads

Relocation of boom pedestals

Replaced boom cabs

Converted diversion vault valves to positive seals (gate valves)

2000 Improvements

$14.4MM

slide32
Sierra Pad

New deicing pad to accommodate wide-body aircraft

Yankee South Pad

Expanded pad and installed liner

2001 Improvements

$41.8MM

slide33
Central piping systemto transfer collectedfluids to onsite recycling facility

Echo and Charlie Pads

Joint and slab rehab/replacement

2002 Improvements

$45 MM

slide34

2003 Improvements

$50.3MM

  • Echo and Charlie Pads
    • Addition of forced air
  • Third party vendor forced air equipment
slide35
Grand total of capital improvements of $50.3MM

Operational costs on an annual basis of $1.7MM per year

Capture 60 – 65% of applied aircraft deicing fluid by volume

Summary of SystemImprovements

slide37
Data Collection and Evaluation

Stormwater Management

Treatment

Current Concept

Engineering Evaluation

slide38
5+ years of flow and water quality data

Intensive and periodic

15 minute continuous rainfall datasince May 1948

Wetland delineation in 2004

Stream assessments in 2004

PG and pavement deicer quantities

Data

slide40

Stream Bacteriological Report

Thiothrix

Beggiatoa

Zoogloea

slide46

Stormwater Evaluation

  • Modeling
    • H&H and water quality
  • Conceptual Design Capture Area
  • Conceptual Design Capture Volume
  • Treatment Rate
slide52

Conceptual Design Capture Area

2 MG

16 MG

Design CaptureArea

Retention Basin

slide53
Existing Source Controls

Collection/Conveyance/StorageAlternatives

Collect ~60% ofApplied Glycol

Results

in 55%

CBOD5 Load

Reduction

slide54
Preliminary Conceptual Capture Volume

Collection/Conveyance/StorageAlternatives

Collect and Treat90% ofImpacted Water

Combined WithExisting SourceControls Resultsin 97%CBOD5 LoadReduction

slide55
Current Conceptual Design Capture Volume

Collection/Conveyance/StorageAlternatives

Collect and Treat75% ofImpacted Water

Combined WithExisting SourceControls Resultsin 93%CBOD5 LoadReduction

slide57

Alternatives Analysis – Treatment Process

Biological

Physical/Chemical

SupportingProcesses

Inclusion ofSanitary Sewage

ConstructedWetlands

slide58
Biological Processes

Biofilm reactor process

Membrane bioreactors (MBR)

Conventional activated sludge/sequencingbatch reactors

Treatment Plant Support Systems

Screening

Retention basin mixing and aeration

Clarification

Dewatering (centrifuge or belt filter press)

Supplemental nutrient feed

Supplemental organic (glycol) feed in non-deicing season

Alternatives Analysis Preliminary Findings - Treatment Processes

slide60

Membrane Bioreactors

Hollow Fiber Membrane Bioreactor Process Train

CrossflowMembrane

BioreactorProcess

slide62

Current Concept

$35 - $40 Million

slide64

Wrap-up

Estimated Cost Per Level

Unit Cost Per% Reduction

Total CBOD5Load Reduction

$20 - $30MM

~$6.25MM

4%

38%

$35 - $40MM

~$0.98MM

55%

$50MM

~$0.91MM

slide66

Purpose and Need

Sphaerotilus natans

slide68

WaterQuality

Streams

Wetlands

WildlifeManage-ment

Financial

Planned Airport Facilities

Primary Environmental/Other Key Issues

slide70

Wrap-up

Estimated Cost Per Level

Unit Cost Per% Reduction

Total CBOD5Load Reduction

$20 - $30MM

~$6.25MM

4%

38%

$35 - $40MM

~$0.98MM

55%

$50MM

~$0.91MM