© 2014 hdr architecture, inc., all rights reserved.© 2014 hdr, … · 2018. 4. 3. · i&c and...
TRANSCRIPT
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© 2014 HDR Architecture, Inc., all rights reserved.© 2014 HDR Architecture, Inc., all rights reserved.© 2014 HDR Architecture, Inc., all rights reserved.© 2014 HDR, Inc., all rights reserved.© 2014 HDR, Inc., all rights reserved.© 2014 HDR, Inc., all rights reserved.© 2014 HDR, Inc., all rights reserved.© 2014 HDR, all rights reserved.
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© 2014 HDR, all rights reserved.
TiffinWater Treatment Plant
Comprehensive Facility Plan (Audit)
May 2016
Jim WeltyAqua Ohio
Jill Marie P.E.Rich Atoulikian P.E.
Glenn Dostal P.E.HDR
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What is an Audit? Why are Audits Conducted? How are Audits Conducted?
Application at the Tiffin WTP:o Facility Overviewo Findings and Recommendationso Capital Planningo Key Considerations
Agenda
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Comprehensive Review of the WTP:o Facility Inventory and Data Collectiono Condition Assessment:
• Performance• Condition• Reliability and Redundancy
o Develop Project Descriptions and Cost Estimates
o Prioritize Projectso Develop Capital Improvements
Program Conducted on a rotating 4 – 5 year
basis
What is an Audit?
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Key Considerations:o Performance:
• Water Quality• Current and Future Water Demands• Current and Future Regulations• Approved Capacity Analysis
o Condition Assessmento Reliability and Redundancy
What is an Audit?
Comprehensive Facility Plan
Water Quality Current
Water Demands
FutureWater
Demands
Current Regulations
Future Regulations
Approved Capacity Analysis
Condition Assessment
Reliability
Redundancy
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Capturing Key Knowledge Develop Capital Improvements Plan Operation Optimization Training New Employees Succession Planning
Why are Audits Conducted?
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Interview Plant Personnelo Managemento Plant Operations Staff Review Historic Plant Data Visual Inspection of Plant Additional Quantitative Analysis,
as needed
How are Audits Conducted?
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Five Levels of InspectionHow are Audits Conducted?
Level 5 Destructive
Forensic Testing
Level 4Non-destructive Forensic Testing
Level 3Performance Testing
Level 2Observation
Level 1Age
Tiffin
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Single Team ApproachHow are Audits Conducted?
Process
Structural
Mechanical
Electrical
I&C and SCADA
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ASMEC Form ExampleHow are Audits Conducted?
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Process Form ExampleHow are Audits Conducted?
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Aqua Standard Electrical and I&C Forms
How are Audits Conducted?
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Condition Assessment RatingsHow are Audits Conducted?
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Reliability Risk Assessment RatingsHow are Audits Conducted?
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Performance Assessment RatingsHow are Audits Conducted?
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Condition Assessment Decision Tree
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Condition Assessment Framework
A well-defined asset inventory will facilitate project prioritization
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Example – Tiffin WTP
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Combined Surface and Groundwater Sourceso Sandusky Rivero 4 wells Average Daily Production Rate =
1.8 MGD Sole source of water for City of
Tiffin (no interconnections)
Facility Overview –General
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Conventional Treatment:o Coagulationo Flocculationo Sedimentationo Multi-media filtration including
GACo Disinfectiono Fluoridationo Finished Water Storage
(with aeration system)
Facility Overview -Treatment Process
Primary and Secondary DisinfectionSodium
Hypochlorite• Applied Pre-Settling, Post-Settling (Intermediate), and Post-Filtration
CoagulationPoly-Aluminum Chloride (PACL)
To facilitate floc formation and algae removal in the Settling Basins during warmer months
Coagulant Aid (Polymer)
Taste and Odor ControlPowdered
Activated Carbon (PAC)
For dental care, as required by Ohio CodeHydrofluosilicic Acid (Fluoride)
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Facility Overview
Sludge/Drain Pump Station
Filtered WaterTransfer Pumps
Mill Race
Wash Water Storage Tank
Raw and Finished Water Pumps
Settling Basin #2
Backwash Transfer Tank
Mixing Tank
Filters 1 - 3
Surface Water Intake Well
Settling Basin #1
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Lagoon #1
Dried Sludgestockpile
Finished Water Clearwell
Lagoon #2
Head Gate & ScreenIntake Structure
Facility Overview
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Historical Water Demands
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Surface Water:o Turbidity
• 10 NTU to 2,500 NTU• Up to 7,000 NTU on occasion
o Algae Issueso High Nitrate Levels Groundwater:o High Strontium Levels Typical blend ratio:o 65% (surface) to 35% (groundwater)o Temperature adjustment
Water Quality Challenges
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Key Existing SDWA RegulationsSurface Water Treatment Rule (SWTR)
Lead and Copper Rule and Revisions
Total Coliform Rule (TCR)
Interim Enhanced Surface Water Treatment Rule (IESWTR)
Stage 1 Disinfection Byproducts Rule (Stage 1 DBPR)
Filter Backwash Recycling Rule
Radionuclide Rule
Arsenic Rule
Stage 2 Disinfection Byproducts Rule (Stage 2 DBPR)
Long-Term 2 Enhanced Surface Water Treatment Rule (LT2ESWTR)
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Raw Water Turbidity
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Settled and Filtered Water Turbidity
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TTHM - LRAA
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HAA - LRAA
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Key Future RegulationsStrontium
Perchlorate
Long-Term Lead and Copper Rule (LT-LCR) Revisions
Carcinogenic VOCs (cVOCs)
Hexavalent Chromium
Nitrosamines
Chlorate
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Flocculation (Mixing Tank) - Capacity
Component Number of Units Description Design Criteria Required /
Recommended
Component Capacity
(MGD)
Flow Basis of Component
(Capacity/Ratio)
Equivalent Max-Day Capacity
(MGD)
Flocculation(Mixing Tank) 1 28' dia. X 14' swd
Volume = 0.064 MGDetention time ≥ 30
minutes Recommended 3.10 MGD - -
Center feed radial flow tank
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Sedimentation - Capacity
Component Numberof Units Description Design Criteria Required /
Recommended
Component Capacity
(MGD)
Flow Basis of Component
(Capacity/Ratio)
Equivalent Max-Day Capacity
(MGD)
Sedimentation 2
Settling Basin #1: L = 79.50', W = 44.67‘
SWD = 11.50') Volume = 0.305 MG
HDT ≥ 4 hours Required 1.83 MGD max day 1.0 1.83 MGD
WOR ≤ 20,000 gpd/ft Required Not Applicable
Surface Loading Rate ≤ 0.5 gpm/ft2 Recommended 2.56 MGD - -
Settling Basin #2: Dia = 75‘
SWD = 11' Volume = 0.364 MG
HDT ≥ 4 hours Required 2.18 MGD max day 1.0
2.18 MGD
WOR ≤ 20,000 gpd/ft Required Not Applicable
Surface Loading Rate ≤ 0.5 gpm/ft2 Recommended 3.18 MGD - -
Sedimentation Total: 4.01 MGD
Settling Basin #1 – End feed rectangular basin with submerged discharge orifice cones at opposite end. Settling Basin #2 – Peripheral feed spiral flow basin with discharge point located at the center of the tank.
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Filters - Capacity
Component Number of Units Description Design Criteria Required /
Recommended
Component Capacity
(MGD)
Flow Basis of Component
(Capacity/Ratio)
Equivalent Max-Day Capacity
(MGD)
Filters 3
Filters #1 and #2: 22' x 12' each
Area = 264 ft2 each
Filter #3: 21'-10" x 12'-2" Area = 266 ft2
Total Filter Area = 794 ft2
Max-Day (with largest unit out-of-service);
Filtration Rate less than or equal to 4
gpm/ft2
Required 3.04 MGD max day 1.0 3.04 MGD
160 hours run time between backwashes. Less than 24 hours without pre-chlorination. Free chlorine residual in the settling basins and
to the filter tops are kept as low as possible to address algae issue, but minimize formation of DBPs.
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Clearwell - Capacity
Assumptions:Max CT value = 41 mg/L-min: min Cl2 = 1.64 mg/L, max pH > 8 min temperature = 5 deg-C
Component Number of Units Description Design Criteria Required /
Recommended
Component Capacity
(MGD)
Flow Basis of Component
(Capacity/Ratio)
Equivalent Max-Day Capacity
(MGD)
Cleawell 1 (with 2 cells)
Cell #1: 0.274 MG @ 10' swd
Cell #2: 0.287 MG @ 10' swd
Total: 0.561 MG @ 10' swd
Max CT req'd for 0.5-log Giardia inactivation = 41 mg/L x min
Required 16.21 MGDpeak hour treatment
1.1713.85 MGD
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Recommendations Source Water:
Major Component Recommendation Priority
Groundwater Wells
Retain services of a Hydrogeologist to study well production rate trends to understand the reliability of the capacity of the existing wells. 1
Install additional production well. 1Conduct SWIP and MPA testing to determine whether or not the well sources are actually under the influence of surface water. 1
Based upon the results of the SWIP and MPA testing, consider a contingency plan which involves placing infrastructure to allow supply of well water directly to either the Filters or the Clearwell for additional reliability.
2
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Major Component Recommendation Priority
Mixing Tank
Repair all moderate to severe deterioration along the concrete foundation at the base of the tank and minor tank corrosion.
1
Consider replacing existing tank and adding a second tank. 1 - 2
Recommendations Mixing Tank:
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Major Component Recommendation Priority
Settling Basin #1
Replace wooden baffles with FRP. 2
Complete all necessary repair work recommended in May 2011 Tank Inspection Report.
2
Replace WEDA sludge removal system. 3
Settling Basin #2
Complete all necessary repair work recommended in May 2011 Tank Inspection Report.
2
Install a baffle with scum removal trough to facilitate removal of floating material.
1
Replace WEDA sludge removal system. 3
Recommendations Settling Basins:
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Recommendations
Major Component Recommendation Priority
Filtered Water Transfer Pumps
Install a third pump to increase redundancy capacity and improve reliability.
1
Replace two existing pumps prior to reaching the end of their useful life. 2
Filters and Filtered Water Transfer Pumps:
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Major Component Recommendation Priority
Fini
shed
Wat
er
Clearwell
Monitor and Repair minor damage caused by wildlife to the protective structural panel façade of the clearwell tank.
2
Aeration System Continue Operation -
High Service Pumping
Change out Pump #13 to a vertical arrangement similar to Pumps #15, #16, and #17.
2
Equip Pumps #13 and #16 with a VFD. 1
Recommendations Clearwell and Finished Water:
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Other Process Recommendations
ProcessConcern Recommendation Priority
Strontium Removal
Possible Cation Exchange System. Perform treatment technology analysis to confirm the best treatment option for strontium. 2
Algae Speciation
Purchase testing equipment and complete algae speciation to determine the impact that potential algae toxin regulations may have at this facility (complete each season).
1
Algae control and DBP reduction
Conduct additional studies to evaluate the alternatives of chlorine dioxide or dissolved air flotation for algae control. Chlorine dioxide as a pre-oxidant would also help reduce DBP formation.
1
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Recommendations Structural:o Repair and seal cracks, repair
spalled concrete, address areas with minor corrosion.
o Analyze buckled bracing at retaining walls along the Mill Race Channel.
o Flood Panel - Flood Log - stop gate system for all at risk doors.
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Recommendations Electrical:oSingle point failures that could result in prolonged interruption of the WTP
operation.• (Active and standby pumps connected to same MCC)
oCritical facilities have back-up power supply. • (Aeration System and Wells)
Mechanical (HVAC):oProper ventilation in accordance with code requirements.
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Capital Planning
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Plan your attack Take experienced teamo Code issues are a big factor Meet with plant staff to obtain history,
records, and reports Team up with applicable owner
discipline during site visit Take pictures, take more pictures Summarize results and complete
estimate ASAP Plan for the future Develop initial project priorities, then
review, adjust and finalize with Owner
Key Considerations
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Questions