scott martin, scio township lambrina tercala, p.e., ohm ... · scott martin, scio township lambrina...
TRANSCRIPT
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SCOTT MARTIN, Scio Township
LAMBRINA TERCALA, P.E., OHM Advisors
A Comparison of
Technologies for
Hydrogen Sulfide Control
from a Lengthy Force MainMWEA 93rd Annual Conference
Boyne Mountain Resort, Boyne Falls
June 26, 2018Partnership Name & Logo
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1. What’s the Issue?
2. How We Got Here
3. Short Term Solutions + Data Gathering
4. Long Term Needs + Options Analysis
5. A Case for Oxygen Injection
6. Where We Are At Now
LET’S TALK
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What’s the Issue?
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Jackson Road Force Main
Jackson Rd PS
Site for Injection
Jackson Rd PS
FM Outfall
Odor Complaints
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Odor Issues & Corrosion Impacts
• Odor Issues
• Force main discharge
• Gravity MHs
• Corrosion Impacts
• Gravity sewers & MHs
• Historical Odor Control
• Safety Concerns
• System Maintenance
• On-going costs
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Hydrogen Sulfide Formation
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Sulfate-Reducing Bacteria
Sulfate-Reducing
Bacteria
Dissolved
Oxygen
Nitrate Sulfate
Anaerobic Conditions
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Our Baseline H2S Levels
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How We Got Here
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Time Line
• 1986 – Construction of Pump Station w/ Chlorine Injection
• 1990s – Nitrate Addition System (Bioxide®) Online
• 2014 – Sanitary Sewer and MH Rehab + Bioxide® Offline
• 2016 – Short Term Solution Implementation & Options
Analysis for Long-Term Solution
• 2017 – Design of Oxygen Injection System
• 2018 – Construction of Oxygen Injection System
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Construction of Jackson Road Pump
• Constructed in 1986
• Lift Station Specifics
• Receives ~90% of Scio’s total flow
• Four (4) wet well pumps
• Qpump = 750 gpm @ 130 ft TDH
• Qfirm = 2250 gpm
• Force Main Specifics
• 16,730 ft (3+ miles)
• 16” diameter
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Chlorine Injection
• Operation Considerations
• Safety for Operators
• Fire Department Inspections
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Nitrate Addition via Bioxide®
• Intent
• Eliminate dissolved H2S & prevent
downstream formation of new sulfides.
• Operational Issues
• FOG layer to build up in wet well
causing mixers to go out of service
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Sewer Televising Downstream of Outfall
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Relining of MHs & Pipe
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Our Baseline H2S Levels
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Short Term Solutions +
Data Gathering
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Short Term Items for Consideration
• Bring Bioxide Back Online
• Add Adsorbing Media to Gravity MH Lids
• Plug Gravity MH Lids
• Monitor H2S at Outfall (continuously)
• Monitor H2S at Grade at Gravity MHs (periodic)
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Jackson Road Force Main
Jackson Rd PS
Site for Injection
Jackson Rd PS
FM Outfall
Odor Complaints
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Data Gathering
• Force Main Specifics
• 16,730 ft (3+ miles)
• 16” diameter
• Qavg = 400-500 gpm
• Qmin = 220 gpm
• Qpeak = 1,035 gpm
Hydraulic Residence Time(length of time water is within force main)
Average: 7+ hours
Pt A Pt B
Time of Travel from A to B
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Odor Absorbing Media @ Gravity MHs
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Nitrate Addition via Bioxide®
• Refurbish Equipment
• Pump Maintenance
• Purge Tank
• Utilize Pump Timers in Consideration
of Flows
• Pump 1 – Base Load
• Pump 2 – Low Flow Periods
• New Formula
• Reduces likelihood of FOG layer
formation
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Vapor Phase Sampling
• OdaLog H2S Data Logger @ Wet Well
0
100
200
300
400
500
600
3/3/16 3/4/16 3/5/16 3/6/16 3/7/16 3/8/16
H2S
Concentr
ation (
ppm
)
Date
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Liquid Phase Sampling
• Liquid Phase Sampling Program
• Wet Well
• Outfall LaMotte Sulfide Test Kit
Units Wet Well Outfall
pH STD 7.7 (avg)
Temperature Deg F 50
DO ppm 0.49 <0.2
Nirtrate ppm <0.5 <0.5
Dissolved Sulfides ppm <0.04 1.03
Dissolved Sulfides
(via Lamotte Sulfide Test Kit)
ppm ND 4-6
Conductivity Umhos/cm 3,410 1,885
ORP mv 12 -137
BOD5 ppm 308 235
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Diurnal Flows + Concentrations
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Long Term Needs +
Options Analysis
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Long Term Needs
• Liquid Phase Treatment
• Installation Point @ Pump Station
• Low-to-No Vapor Phase Hydrogen Sulfide
• Reduce odor and corrosion
• Max of 20 ppm
• Low Operating Cost
• Hands Off Operation
• No Disruption to Lift Station Operation
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Technology Options Considered
Treatment TypeProduct
Manufacturer
Recommended
Product
Nitrate Addition Evoqua Bioxide
Chemical OxidationGE Water ProSweet
DW3 PlanetBreeze/NanoMaxx
Biological Treatment
BioScience ANL
Novoxymes AOS2008 and OCM2020
State Chemical Pit Raider/Nutri-Pro
Air/Oxygen Injection
BlueInGreen SDOX 200
ECO2
Anue
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Technology Options Recommended for Trial
Nitrate Addition Chemical Oxidation
Microbial Treatment Oxygen Injection
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Sulfate-Reducing Bacteria
Sulfate-Reducing
Bacteria
Dissolved
Oxygen
Nitrate Sulfate
Anaerobic Conditions
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Nitrate Addition
Sulfate-Reducing
Bacteria
Dissolved
Oxygen
Nitrate Sulfate
Anaerobic Conditions
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Nitrate Addition
• Approach
• Inject calcium nitrate to prevent sulfide production
• Advantages
• Proven system technology
• Provides downstream control
• Low-to-no capital cost
• Disadvantages
• High annual and life cycle costs
• Requires chemical handling
Existing Calcium Nitrate System
@ Pump Station
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Bioxide Trial: March-April 2016
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Microbial Treatment
NON
Sulfate-Reducing
Bacteria
Dissolved
Oxygen
Nitrate Sulfate
Anaerobic Conditions
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Microbial Treatment
• Approach
• Inject microbes that do not reduce sulfides
• Advantages
• Provides downstream control
• No chemicals
• Lower capital cost
• Disadvantages
• Not all microbes are ‘equal’; results vary
• Long inoculation period
• Microbes susceptible to kill-off due to spillsExisting FOG System Converted to Microbial
Feed System for Trial @ Lift Station
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Sulfate-Reducing Bacteria
Sulfate-Reducing
Bacteria
Dissolved
Oxygen
Nitrate Sulfate
Anaerobic Conditions
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Technology Ranking Considerations
• Sustainability Index
• O&M Staffing Needs
• Performance Efficiency
• Present Worth Cost
• Odor Control Approach
• Future Use
• Transferability of system
• Transfer of capital
• Impact on Ann Arbor
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Results
BAD
Nitrate
Addition
Oxygen
Injection
Microbial
Treatment
BETTER
BEST
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A Case for Oxygen Injection
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Oxygen Injection
• Approach
• Inject oxygen to prevent sulfide formation
• Uses pressure head in FM to supersaturate oxygen into water
• Advantages
• Proven technology
• Provides downstream control
• Beneficial annual and life cycle costs
• Disadvantages
• Newer technology for conveyance systems
• Proprietary systems
• Requires oxygen generation or storage
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Case Study – Raymore, MO
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Raymore, MO – Owen Good PSCase Study – El Paso, TX
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Raymore, MO – Owen Good PSCase Study – Laguna Beach
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Raymore, MO – Owen Good PSCase Study – Laguna Beach
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Recommendation of OXYGEN INJECTION SYSTEM
• Preventative Form of Odor Control
• Preventative Form of Corrosion Control
• Environmentally Friendly
• Sustaining Aerobic Conditions
• Lower Life Cycle Cost
• Ability to Meet Control Objectives
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Where We Are At Now
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Process Flow Diagram
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Design - Isometric
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Construction
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Construction
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Construction
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Construction
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START UP IN AUGUST 2018
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QUESTIONS?