innovative improvements to a 53-year old water plant for ... · ohio awwa annual conference –...
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Robert T. Shoaf, P.E., BCEE – AECOM (Columbus, Ohio)Scott Hoover, Plant Superintendent – Napoleon, Ohio
Innovative Improvements to a 53-Year Old Water Plant for HABs, Crypto, and Whatever Else the Maumee River Brings
Ohio AWWA Annual Conference – Toledo 2017
• Introduction• Napoleon’s Current Water Plant• Water Quality (Maumee River and Wauseon
Reservoir)• Initially Proposed Process vs. Final• Proposed Processes / Jar Testing• Proposed Strategy for Treating Source• Architectural Concepts• Schedule / Funding
Presentation Summary
Ohio AWWA Annual Conference – Toledo 2017
Population: Approximately 9,000
Provides Water to Several Satellites Including:FloridaLiberty CenterMalinta (and McClure)Henry County Regional Water DistrictSome other areas
Water Treatment Plant:4.5 MGD Lime Softening with Miex pretreatmentAverage Demand: 1.36 MGDOhio EPA Orders for Additional Treatment for
CryptosporidiumWater Met All Water Quality Standards at Plant
Satellite Systems Had THM Concerns
Napoleon, Ohio
Ohio AWWA Annual Conference – Toledo 2017
Napoleon WTP - Existing Plant
Ohio AWWA Annual Conference – Toledo 2017
Napoleon WTP – Raw Water SourceMaumee River
Napoleon, Ohio
Tributaries Include:Auglaize River, Blanchard River, St Marys, Tiffin River
Ohio AWWA Annual Conference – Toledo 2017
• Water Quality Varies Tremendously
• City has Bin 2 Designation due to Raw Water Crypto Sampling
• Occasional Microcystin Detects in Raw Water
• Wauseon Reservoir Helps in Many Ways, Hurts with HABs (but still rel. low)
Napoleon WTPMaumee River Water Quality
Water Quality Data from USGS upstream of Napoleon (2006-2016) plus Other Estimated Values
Constituent Units Min Average MaxIron mg/L 0.2 2.3 10.7Manganese mg/L 0.02 0.06 0.17Alkalinity mg/L as CaCO3 87 160 244Conductivity uS/cm 267 576 914Hardness mg/L as CaCO3 124 235 385Nitrate mg/L 0.05 4 12+Turbidity NTU 1 50 1400TOC mg/L 2 6 10+
Ohio AWWA Annual Conference – Toledo 2017
Original RFP Was Issued To Design the Following Processes:
1. Pretreatment Solids Contact Upflow Clarifiers
2. Upgrade Lime Softening Process
3. Upgrade Chemical Feed
4. Upgrade Gravity Filters
5. Filter to Waste
6. UV Disinfection
7. Granular Activated Carbon (GAC) Contactors
8. Second Clearwell
Napoleon WTP
Ohio AWWA Annual Conference – Toledo 2017
Napoleon WTPExisting Chemical Feed Systems
• Existing Chemical Feed Equipment is Original and Parts No Longer Available
• City Wanted to Remove Chlorine Gas Due to Safety Concerns
Ohio AWWA Annual Conference – Toledo 2017
Napoleon WTPOriginal GAC – UV Option
Ohio AWWA Annual Conference – Toledo 2017
Napoleon WTPAlternative Options: Lime and GAC vs. Reverse Osmosis Membranes
TABLE 13
COMPARISON OF CAPITAL AND OPERATIONAL COSTS OF ALTERNATIVESAlternative 1 - Lime
Softening - Conv. Filtration -GAC
Alternative 2 - Conv. Sedimentation - Conv.
Filtration - RO (NF) Softening
Alternative 3 - Conv. Sedimentation - UF Membranes
- RO (NF) SofteningLime-Soda Softening Capital
Costs$165,000 $0 $0
Conventional Gravity Filter Upgrade Costs
$648,150 $648,150 $0
GAC Equipment Capital Cost $3,463,000 $0 $0
NF Membrane Softening Capital Cost
$0 $3,295,000 $3,295,000
Ultrafiltration Membrane Add'l Capital Cost
$0 $0 $2,965,000
Total Capital Cost $4,276,150 $3,943,150 $6,260,000Lime-Soda Softening Annual Costs (including sludge and
CO2)
$108,836 $0 $0
GAC Annual Cost $336,800 $0 $0Membrane Softening Annual
Cost$0 $331,000 $331,000
UF Membrane Additional Annual Cost
$0 $0 $225,000
Total Annual Cost $445,636 $331,000 $556,000Total Present Worth $10,300,000 $8,400,000 $13,800,000
Relative Cost (Capital and Annual Operating)
Middle Lowest Highest
Ohio AWWA Annual Conference – Toledo 2017
Napoleon WTPAlternative Process (RO) – UV
Ohio AWWA Annual Conference – Toledo 2017
1. Upgrade Raw Water Intake (VFDs, Control Valves)
2. Pretreatment Basins
3. Modify Existing Miex Process as Pretreatment
4. Add Significant PAC Improvements (Algal Toxin Concerns)
5. Upgrade Gravity Filters – New Underdrains / Deeper Media / Filter to Waste
6. New Filter Influent / Effluent Valves / Actuators
7. Lime Softening Improvements
8. New RO Membrane Process (Softening and TOC Removal Process –plus removes contaminants from river)
9. Granular Activated Carbon Contactors
10. Convert to Sodium Hypochlorite (eliminates chlorine gas)
11. UV Disinfection (Added for Ohio EPA Orders)
12. New High Service Pumps
Napoleon WTP (Red Indicates Additional / Revised)
Ohio AWWA Annual Conference – Toledo 2017
Napoleon WTPJar Testing Results for Turbidity
ACH shows promise
Ohio AWWA Annual Conference – Toledo 2017
Napoleon WTPJar Testing Results for TOC Reduction
ACH shows promise
Ohio AWWA Annual Conference – Toledo 2017
Napoleon WTPPartial Strategy for Treating Variable Source
1. Convert Existing Miex Process to Pretreatment (but not expecting to get toolbox credits).
2. Switch Coagulant from Alum to ACH.a) Pretreatment Feed (for turbidity and TOC reduction)b) Secondary Feed Prior to Sed. Basins (for turbidity and TOC reduction)c) In-line Rapid Mixing
3. Add Sodium Permanganate Feed System (to satisfy demand)
4. Significantly Upgrade PAC Feed (for HABs)
5. Monitor and Pace Permanganate Feed off of downstream ORP AND Hach Cl17 (which can also measure permanganate residual)
6. Install City-Owned Streaming Current Monitor (for monitoring only now)
7. Convert Horizontal Flocculators to 4-Stage Vertical Flocculators
8. Add Plate Settlers
9. Upgrade Filters
Ohio AWWA Annual Conference – Toledo 2017
Napoleon WTPExisting MIEX Process to be Modified
Ohio AWWA Annual Conference – Toledo 2017
Napoleon WTPExisting Floc / Sed Processes to be Modified
Ohio AWWA Annual Conference – Toledo 2017
Napoleon WTPSedimentation Improvements with Plate Settlers
Ohio AWWA Annual Conference – Toledo 2017
Napoleon WTPExisting Filters to be Upgraded
Replace Filter Pipe Gallery Valves
Provide New Filter Media (Anthracite – Sand)
Replace Wheeler Bottoms with New UnderdrainsExisting Media:
30-inch Monomedia
36-inches of Media21 inches anthracite15 inches sandL/D10 > 1,250
Ohio AWWA Annual Conference – Toledo 2017
IFRapid Mix Flocculation Sedimentation Sand Filtration <0.15 NTU GAC Filter UV Disinfection Clearwell To Distribution
+ 0.5 log + 0.5 log + 2.5 log + 0.0 log
1098
321
0 Bin
4
Cu
mu
lati
ve L
og
Cre
dit
fo
r C
ryp
to.
Inactivation
Removal
Bin
1
Bin
2B
in 3
Conventional Treatment
+ 3-log
4567
Napoleon WTPCryptosporidium Removal / Inactivation Options
Ohio AWWA Annual Conference – Toledo 2017
UV Disinfection Project (Completed Dec 2016):- Included New High Service Pumps / UV Reactors
• Requested / granted 3-log credit for both Crypto and Giardia• Allows bypass of main clearwell (for maintenance, etc.) with
virus inactivation acheived in much smaller wet well (new).• Uncommon arrangement being downstream of clearwells.
Napoleon WTP
Existing High Service Pump Station was Constructed BEFORE the Plant and Requires a Priming System to Operate at Low Clearwell Levels
Ohio AWWA Annual Conference – Toledo 2017
Napoleon WTPRO to Replace Lime And MIEX
Membranes to Eliminate Lime Softening
Membranes also Eliminate Miex (TOC)
Membranes also Can Remove Nitrates, Atrazine, and Other Constituents of Concern in Maumee River
Ohio AWWA Annual Conference – Toledo 2017
Napoleon WTP - Proposed Process
Ohio AWWA Annual Conference – Toledo 2017
Napoleon WTP – Architectural Concept
Previous Plant (Demolished in 1960’s and 1990’s)
Current Plant (Brick) with Metal Building (Houses Miex Pretreatment)
Napoleon WTP – Initial Concept (Draft)
Design Option 1
09.08.2015
Napoleon WTP Current Concept New Building
Napoleon WTP – Final Rendering
Napoleon WTP Progress Photo – July 13, 2017
Napoleon WTP Progress Photo – September 14, 2017
Napoleon WTP Progress Photo – September 14, 2017
New “Clearwell”
(virus inactivation
only)
UV
Napoleon WTP April 2018 Projected Start-Up
Membrane Design includes:2 Skids – 18:9, 7M (2 Stage) – Loose NF Membranes [TOC, Hardness]2 Skids – 18:9, 7M (2 Stage) – Tight NF/RO Membranes [Nitrates, Atrazine, etc]
Ohio AWWA Annual Conference – Toledo 2017
Napoleon WTP Construction Schedule
• UV Improvements Project Completed 2016
• WTP Project Bid: March 1, 2017
• Notice to Proceed: May 3, 2017
• Construction Start: June 1, 2017
• Projected Membrane Start-up: April 2018
• All Equipment Start-up: October 2018
• Construction Completion: December 2018
Ohio AWWA Annual Conference – Toledo 2017
Two (2) Phase Project:
- Phase 1: UV Disinfection Improvements, New High Service Pumps, SCADA
(COMPLETE)$1.4 million
- Phase 2: Water Plant Improvements
(PROJECT UNDERWAY)
$14 million
Project Summary
Ohio AWWA Annual Conference – Toledo 2017
Napoleon WTP Funding PackageWhile Construction Costs Have Gone Up slightly over Time, Actual Cost Impacts to Users Has Gone DOWN!
City and AECOM Applied Aggressively and Creatively for Funds through Ohio EPA Drinking Water Assistance Fund
Achieved:$2,900,000 Principal Forgiveness (GRANT)!
Balance:Subsidized 30-year interest Loan (0% Interest)
Ohio AWWA Annual Conference – Toledo 2017
Napoleon’s Water Treatment Plant is Getting a Facelift and Water Quality is Improving
Reverse Osmosis will be Providing Softening AND Organics Removal
Significant Additional Infrastructure Improvements Now Included: High Service Pumps (Replaced with New) Algal Toxin Treatment UV Disinfection More Valve Replacements More Efficient Heating / Cooling Systems Reverse Osmosis Membrane Process Protects Residents from Future
Contaminants Found in River
Summary
Questions?Rob [email protected](614) 600-5930 office(614) 332-0217 cell
Robert T. Shoaf, P.E., BCEE
Scott Hoover