Valiant Efforts in Versailles:
How One Utility Balanced Growth
and Financial Means
Jim Gagnon, CH2M HILL
Randy Gump, Village Administrator
Dane Nagel, Utilities Superintendent
OWEA 2011
Savvy Planning and Design Resulted in
Expanded Facility That Exceeded Goals
Project Drivers
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•
Effluent Total Phosphorus Limit of 1.0 mg/L
Reduce/Eliminate Effluent Blending
** Plant experienced 32 excess flow
diversions on average per year (2003-7)
….. Accomplish objectives within the financial
means of the Village of Versailles
Where is Versailles Located?
•
•
•
•
Southwestern Ohio
Darke County (borders Indiana)
43 Miles North of Dayton
Population: 2,687
2008 Aerial of Village WWTP
Two Notable Studies Focused On WW
Collection and Treatment Facilities
•
•
January 2006 Wastewater Treatment Facility
Evaluation Report
August 2006 Collection System Flow
Monitoring Study
Results of Prior Studies Used to Develop
Wastewater General Plan
•
Achieve Final Effluent
Limits
•
Present Design Criteria
for WWTP Expansion
and Upgrade
Effluent Blending – A Major Issue
•
USEPA Issues Proposed Wet Weather Policy
in December 2005
– Authorities can approve wet weather flow
diversions around secondary treatment in an
NPDES permit as an anticipated bypass for
sanitary systems
– OEPA does not regard effluent blending as a
permanent solution to peak wet weather
flow management
– Granted through the “No Feasible
Alternatives Analysis” (NFAA) Process
Alternatives Considered in NFAA
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•
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Inflow/Infiltration Reduction
Equalization Capacity
Augmentation
High Rate Treatment of Excess
Flows
Parallel Secondary Treatment
for Excess Wet Weather Flow
Expansion of Existing
Treatment Capacity
NFAA Conclusions
•
•
Expansion of existing plant capacity and
increased I/I control produced greatest benefit
and least impact on ratepayers
Plant Expansion
– Provides for growth in service area
– Addresses nutrient control initiatives
– Controls effluent blending
•
I/I Control
– Through collection system maintenance/repair
– Enforcement
– Public outreach
Negotiation of NPDES Limits
•
Plant Capacity Expansion:
3.4 - Peak Day
6.0 - Peak Day
•
Anti-Degradation - Maintain mass loading
limits constant and accepting proportionately
reduced concentration limits for cBOD5, TSS
and NH4
Negotiation of NPDES Limits
cBOD5
TSS
NH4-N
summer
NH4-N
winter
Mass
Loading
73.0 ppd
87.6 ppd
Previous
Permit 1
25 mg/l
30 mg/l
New
Permit 2
11.7 mg/l
14 mg/l
6.7 ppd
2.3 mg/l
1.1 mg/l
26.6 ppd
9.1 mg/l
4.2 mg/l
Notes:
1) Based on 0.35 MGD average.
2) Based on 0.75 MGD average.
Agreement on General Plan, NFAA and
NPDES Permit Led to Construction of
New Facilities
Expanded Influent Pumping
for Dry & Excess Flows
Features:
• Dual wet wells with
weir
• Firm dry flow capacity
of 4.5 MGD (I unit on
standby)
• Firm excess flow
capacity of 1.5 MGD
(1 unit on standby)
New Screen Facilities
Features:
• 4.5 MGD of DWF
screening capacity –
1.5 mm static screens
• Existing (2) screens
re-used for excess
flow to EQ tanks – 1.5
MGD
• Room provided for
future screen
New Oxidation Ditch Enhances
Secondary Treatment
Features:
• Removes hydraulic
bottleneck
• Provides BPR/BNR
capability
• Room for future 2nd
ditch
Deep Conservatively Designed Secondary
Clarifiers Produce Compliant Effluent
Features:
• Two 55’ diam. Units
• 29.1 ppd/sf solids
loading rate
• 15 ft. SWD
• Room for future 3rd
unit
New UV System Designed for FC Limits
Also Complies with EC Limits
Features:
• LPHO Horizontal
Lamp Array
• Two banks provided
for operational
flexibility
• 6 MGD peak flow
capacity, 55% UVT

Add photo of UV
System
New Effluent Pump Station Ensures
Discharge Capacity at High River Levels
Features:
• Raises HGL above the
25-year flood
elevation
• Provides firm pump
capacity of 6 MGD (1
unit on standby)
New Aerobic Digester Meets Regulatory
Requirements for On-Site Storage
Features:
• New tank volume of
640,000 gal
• Retained 3 existing
digesters
• Combined digester
volume provides 183
days of on-site storage
Prudent Re-Use of Existing Structures
Augments EQ Capacity
Features:
• Removal of old tanks
serving as EQ made
room for new
clarifiers
• Existing ditch and
clarifiers provide 20
hours of storage at the
5 yr-24 hr design
storm
ARRA Funds Limit Village Expenditures
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•
ARRA funds lower
debt service cost per
household
Versailles has 1,100
residential accounts
ARRA
$4,473,000
Balance of OEPADEFA Loan:
$3,473,000
Village Benefits from Bidding
Environment and Aggressive Schedule
9 - General Bidders
7 - Electrical Bidders
NTP
8-14-09
Contract Substantial
Completion
4-16-11
Actual Substantial
Completion
11-1-10
WWTP Performance
For Period Jan. 2010 – Dec. 2010
Notables:
• Outstanding plant
performance
• No effluent blending
episodes even during
wet spring 2011
• Mixer problems have
hampered bio-P
removal
Concentration (mg/l)
Average
Influent
Average
Effluent
Permit
386,000
-
-
cBOD5
241
5.1
11.7
TSS
197
6.9
14
TKN
41
1.1
-
NH4-N
16
0.2
1.1
NOx-N
-
7.7
-
TP
7.2
2.2
1.0
pH (S.U.)
7.4
7.4
6.5-9.0
-
7.1
> 5.0
Flow (gpd)
D.O.
Valiant Efforts in Versailles:
How One Utility Balanced Growth
and Financial Means
Questions?
[email protected]
513-587-7078