innovative improvements to a 53-year old water plant … · modify existing miex process as...

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


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


Napoleon WTP - Existing Plant


Napoleon WTP – Raw Water SourceMaumee River

Napoleon, Ohio

Tributaries Include:Auglaize River, Blanchard River, St Marys, Tiffin River


• 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+


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


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


Napoleon WTPOriginal GAC – UV Option


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


Napoleon WTPAlternative Process (RO) – UV


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)


Napoleon WTPJar Testing Results for Turbidity

ACH shows promise


Napoleon WTPJar Testing Results for TOC Reduction

ACH shows promise


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


Napoleon WTPExisting MIEX Process to be Modified


Napoleon WTPExisting Floc / Sed Processes to be Modified


Napoleon WTPSedimentation Improvements with Plate Settlers


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


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


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


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


Napoleon WTP - Proposed Process


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]


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


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


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)


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

innovative improvements to a 53-year old water plant … · modify existing miex process as...

Documents