THE WONDERFUL WORLD OF WATER. Steve Turner, P.E., PMP, ENV SP Bite of Science October 25, 2017

Transcription

1 THE WONDERFUL WORLD OF WATER Steve Turner, P.E., PMP, ENV SP Bite of Science October 25, 2017

2 WHO AM I? Steve Turner, P.E., PMP, ENV SP Project Manager Gannett Fleming Husband and Father Volunteer Church Soccer K-12 Outreach

3 A Local Boy Mary Atkins Riverside Elementary Dunbar Erwin Middle Hines Middle Ferguson High Virginia Tech Gannett Fleming

4 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

5 What Do I Do? Three Major Elements of the Water Industry Drinking Water

6 What Do I Do? Three Major Elements of the Water Industry Wastewater

7 What Do I Do? Three Major Elements of the Water Industry Stormwater

8 Potable Water Storage Tanks Design (5 KG to 20 MG) Construction/ Coating Inspection Assessment and Rehab Modifications Mixing Systems Antenna Installation Instrumentation Chemical Feed Demolition Steel Composite Concrete

9 Tanks come in different shapes and sizes

10 Evaluating Candidate Sites (Dale City, VA)

11 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

12 Lewisburg, PA Photo Rendering

13 Shadow Projections

14 Provide Construction Plans for Contractors

15 RECENT RELEVANT RESEARCH

16 They are compounds formed when chlorine reacts with naturally-occurring organic matter. Trihalomethanes (TTHM) Haloacetic Acids (HAA) Currently Regulated

17 Understanding DBPs HOCl + NOM Chlorinated Organics Function of: (TTHM and HAA) NOM Conc., Chlorine Dose, ph, temperature, time Opportunities for Control

18 Options for DBP Control in the Distribution System Piping Network Flushing Looping Chlorination Strategic booster chlorination Storage Tanks Operational adjustments Tank mixing Tank aeration

19 Storage Tank Options Operational Adjustments Estimated Water Age >> 16 days (Fluoride Tracer) TTHM = ppb HAA = ppb Projected Water Age Following Operational Changes ~ 7 days TTHM < 60 ppb HAA < 50 ppb

20 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

21 Tank Mixing Temperature Model 2 Minutes 30 Minutes 60 Minutes Source: The Science of Mixing Water Storage Tanks. Michael J. Duer, P.E., 2003

22 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

23 Storage Tank Options - Tank Aeration Multiple Tray Cascade Packed Tower Spray Surface Aeration Diffused Tray Aeration Methods NOT COST EFFECTIVE

24 Storage Tank Options - Tank Aeration Image courtesy of SolarBee

25 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

26 EMERGING TECHNOLOGY ROBOTICS

27 A Robot Invasion!?

28 WHY ROBOTS? Two Primary Drivers Safety inherent risk in climbing and entering storage tanks Efficiency save money; save time

29 VIDEO SAMPLE OF DRONE INSPECTION

30 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

31 ROV VIDEO OF A CORRODED ROOF

32 AFTER REMOVING CORROSION PRODUCT TO EXPOSE METAL LOSS ROV ADJUSTS LIGHTING FOR BEST VIEW

33 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

34 VIDEO SHOWING POINT OF VIEW OF ROBOVACTM

35 VIDEO SHOWING SIGNIFICANT SEDIMENT DEPTH

36 Manufactured by International Climbing Machines TANK CLIMBING Held to surface by vacuum pressure Flexible seal adjusts to surface irregularities Weight = 23 lbs Speed = 2.7 in/sec

37 TANK CLIMBING DRY FILM THICKNESS READINGS Positector and camera mounted to climber Gears enable lateral movement of Positector

38 TANK CLIMBING WELD GRINDING Animation of Proposed Unit

39 SHOP TESTING OF GRINDER

40 VIDEO OF SHOP TESTING

41 GETTING STUDENTS INVOLVED

42 Classroom Presentations Elementary/Middle

43 Classroom Presentations High School

44 Model Water Tower Competition Free event Middle School students build functioning water towers Every October at ODU

45 Junior Water JAM Annual Industry Conference Students Engage with professionals Students tour Exhibit Hall and see latest technology Every September

46 Opportunities for Students Internships/Mentoring Private Public Hampton Roads Public Works Academy Treatment Plant or Laboratory Tours

47 Conclusions Engineering.. Finding the best solution in a world full of right answers The Quest for None of the Above

48 THANK YOU! QUESTIONS?