THE WONDERFUL WORLD OF WATER · 2019. 2. 12. · THE WONDERFUL WORLD OF WATER Steve Turner, P.E.,...
Transcript of THE WONDERFUL WORLD OF WATER · 2019. 2. 12. · THE WONDERFUL WORLD OF WATER Steve Turner, P.E.,...
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THE WONDERFUL WORLD OF
WATER
Steve Turner, P.E., PMP, ENV SP
Bite of Science
October 25, 2017
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WHO AM I?
Steve Turner, P.E., PMP, ENV SP
• Project Manager – Gannett Fleming
• Husband and Father
• Volunteer
– Church
– Soccer
– K-12 Outreach
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A Local Boy
Mary Atkins
Riverside Elementary
Dunbar Erwin Middle
Hines Middle
Ferguson High
Virginia Tech
Gannett Fleming
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Gannett Fleming Background
• More than 60 offices worldwide
• 2,000+ professionals
• Diverse range of services and
specialized expertise
#11 – Top 15 in Dams & Reservoirs
#20 – Top 20 in Water Treatment and
Desalination
#19 – Top 25 in Wastewater
Treatment Plants
#26 – Top 50 in Water Supply
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What Do I Do?
Three Major Elements of the Water Industry
Drinking Water
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Three Major Elements of the Water Industry
Wastewater
What Do I Do?
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Three Major Elements of the Water Industry
Stormwater
What Do I Do?
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Potable Water Storage Tanks
Design
(5 KG to 20 MG)
Construction/
Coating
Inspection
Assessment
and Rehab Modifications Demolition
• Steel
• Composite
• Concrete
• Mixing Systems
• Antenna
Installation
• Instrumentation
• Chemical Feed
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Tanks come in different shapes and sizes
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Evaluating Candidate Sites (Dale City, VA)
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Example Site Selection Criteria
• Set-back Requirements
• Site Size Requirements and Ownership
• Tank Operational Requirements
• Water Main Piping Requirements, Including the Distance to the Nearest Main and Approximate Cost
• Traffic Constraints/Impacts
• FAA Requirements/Height Restrictions
• Publicly Sensitive Areas (i.e. Historic and Archaeological)
• Utilities and Communication Requirements
• Environmentally Sensitive Areas including Site Visit
• Environmental Impacts (i.e. overflows)
• Wetlands, Streams and Floodplain Impacts
• Topography
• Soils
• Land Use
• Impacts on Water Age and associated Water Quality Changes
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Lewisburg, PA Photo Rendering
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Shadow Projections
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Provide Construction Plans for Contractors
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RECENT RELEVANT RESEARCH
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They are compounds formed when chlorine reacts with naturally-occurring organic matter.
•Trihalomethanes (TTHM) •Haloacetic Acids (HAA) Currently Regulated
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Understanding DBPs
HOCl + NOM Chlorinated Organics
Function of:
NOM Conc., Chlorine Dose, pH, temperature, time
Opportunities for Control
(TTHM and HAA)
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Options for DBP Control in the Distribution System Piping Network
Flushing
Looping
Chlorination
Strategic booster chlorination
Storage Tanks
Operational adjustments
Tank mixing
Tank aeration
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Storage Tank Options – Operational Adjustments
Estimated Water Age >> 16 days (Fluoride Tracer)
TTHM = 140 - 170 ppb
HAA = 80 – 95 ppb
Projected Water Age Following Operational Changes ~ 7 days
TTHM < 60 ppb
HAA < 50 ppb
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Storage Tank Options - Tank Mixing Mixing equalizes water
age, temperature, and DBP concentration
Does NOT reduce DBPs
Still need water turnover to be effective
Two types:
Passive
Active
Image courtesy of PAX Water Technologies
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Tank Mixing – Temperature Model 2 Minutes 30 Minutes 60 Minutes
Source: “The Science of Mixing Water Storage Tanks.” Michael J. Duer, P.E., 2003
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Storage Tank Options - Tank Aeration
Aeration Theory
Aeration = exchange of gas from water to air
Governed by Henry’s Law [p = (HC) / (PT)]
TTHMs are VOCs, HAAs are Not VOCs
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Storage Tank Options - Tank Aeration
Aeration Methods
Multiple Tray
Cascade
Packed Tower
Spray
Surface Aeration
Diffused Tray
NOT COST
EFFECTIVE
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Storage Tank Options - Tank Aeration
Image courtesy of SolarBee
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Storage Tank Options - Tank Cleaning Eliminates organic
matter that settles in storage tank
Identify issues during tank and coating inspections
Recommended every 3-5 years
Robotic options available without draining tank
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EMERGING TECHNOLOGY
ROBOTICS
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A Robot Invasion!?
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WHY ROBOTS?
Two Primary Drivers
• Safety – inherent risk in climbing and entering storage tanks
• Efficiency – save money; save time
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VIDEO SAMPLE OF DRONE INSPECTION
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SUBMERSIBLE REMOTELY OPERATED VEHICLES (ROVs)
Internal Tank Inspection
• Advantages
– No tank entry required
– Performed while tank is still in service
– Multiple inspections per day (typical)
• Disadvantages
– Limited by water depth
– Roof assessment can be limited
– Sediment can obscure the floor
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ROV VIDEO OF A CORRODED ROOF
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AFTER REMOVING CORROSION PRODUCT TO EXPOSE METAL LOSS
ROV ADJUSTS LIGHTING FOR BEST VIEW
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ROBOTIC STORAGE TANK CLEANING
Advantages
• Performed while tank is in service
• Cost-effective for sediment depths less than 1 inch
Disadvantages
• Time-consuming for sediment depths greater than 1 inch
• Limited by length of tether and hose for elevated tanks
Considerations
• Handling of effluent
– Filtration
– De-chlorination
• Sediment Disposal
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VIDEO SHOWING POINT OF VIEW OF ROBOVACTM
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VIDEO SHOWING SIGNIFICANT SEDIMENT DEPTH
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TANK CLIMBING
• Manufactured by International Climbing Machines
• Held to surface by vacuum pressure
• Flexible seal adjusts to surface irregularities
• Weight = 23 lbs
• Speed = 2.7 in/sec
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TANK CLIMBING – DRY FILM THICKNESS READINGS
• Positector and camera mounted to climber
• Gears enable lateral movement of Positector
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TANK CLIMBING – WELD GRINDING
Animation of Proposed Unit
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SHOP TESTING OF GRINDER
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VIDEO OF SHOP TESTING
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GETTING STUDENTS
INVOLVED
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Classroom Presentations – Elementary/Middle
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Classroom Presentations – High School
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Model Water Tower Competition
• Free event
• Middle School
students build
functioning
water towers
• Every October at
ODU
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Junior Water JAM
• Students tour Exhibit Hall and see latest technology
• Every September
• Annual Industry Conference
• Students Engage with professionals
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Opportunities for Students
• Internships/Mentoring
– Private
– Public
• Hampton Roads
Public Works
Academy
• Treatment Plant or Laboratory Tours
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Conclusions
Engineering…..
• Finding the best solution in a world full of
“right” answers
The Quest for “None of the Above”
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THANK YOU!
QUESTIONS?