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29 Ju
ne 2
016
WASTEWATER RESIDUALS MANAGER, CITY OF COLUMBUSBRANDON FOX
“WE DON’T NEED NO… INCINERATION”LESSONS LEARNED AS COLUMBUS TRANSITIONS TO 100% BENEFICIAL RE-USE OF BIOSOLIDS
SIERRA MCCREARY ENGINEERING MANAGER, BLACK & VEATCH
AGENDA
1 – Columbus’ Biosolids Management Strategy2 – Schedule and Key Decisions 3 – Biosolids Land Application Facility 4 – Lessons Learned
2
COLUMBUS’ BIOSOLIDS MANAGEMENT STRATEGY
3
Southerly Wastewater Treatment Plant
Columbus, OH
CO
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• Traditional Activated Sludge Type Plants• Primary Clarification• Secondary Biological Treatment (aeration)• Final Clarification
• Solids Treatment System• Combined 24,000 dry tons per year
• Unclassified• Anaerobic Digested Class B • Class A Exceptional Quality Biosolids
JACKSON PIKE AND SOUTHERLY WWTP SOLIDS TREATMENT
29 June 2016Black & Veatch
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CO
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PREVIOUS SOLIDS MANAGEMENT PROGRAM OVERVIEW (2009)
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29 June 2016Black & Veatch
UNCLASSIFIEDSOLIDS
CLASS BBIOSOLIDS
THICKENING DEWATERING DEWATERING
LANDAPPLICATION
INCINERATION COMPOST FACILITY
(JP Only)
CO
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PREVIOUS SOLIDS MANAGEMENT PROGRAM OVERVIEW (2014)
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29 June 2016Black & Veatch
UNCLASSIFIEDSOLIDS
CLASS BBIOSOLIDS
THICKENING DEWATERING DEWATERING
LANDAPPLICATION
OHIO MULCH
INCINERATION OFF SITEDIGESTION
COMPOST FACILITY
(JP Only)
Southerly WWTP Multiple Hearth Incinerator (MHI)
CO
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BU
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EGY • Maximum Achievable Control Technology
(MACT)• MHI Condition Assessment and BCE
• Initial Goal: Determine what incinerator repairs are necessary at both plants.
• Revised Goal: Determine the optimal number of incinerators to improve based on available capacity of ALL management outlets.
• Comprehensive system approach
• Findings• Incineration improvements not necessary
with an expanded beneficial reuse program (Land Application)
MACT COMPLIANCE
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Southerly WWTP Multiple Hearth Incinerator (MHI)
CO
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• Southerly Incinerator Catastrophic Failure March 2015
• Title V MACT Standards effective March 21, 2016
• Jackson Pike Incinerator shutdown March 8, 2016
MACT COMPLIANCE
29 June 2016Black & Veatch
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CO
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29 June 2016
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Black & Veatch
Incineration2,47510%
Liquid LA2,277
9%
Compost8,42434%
quasar3,74115%
Deep Row Hybrid Poplar
6,96028%
Landfill1,044
4%
COLUMBUS BIOSOLIDS DISTRIBUTION 2015, DRY TONS
CO
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FUTURE 100 % BENEFICIAL REUSE PROGRAM
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29 June 2016Black & Veatch
UNCLASSIFIEDSOLIDS
CLASS BBIOSOLIDS
THICKENING DEWATERING DEWATERING
LANDAPPLICATION
OHIO MULCH
INCINERATION OFF SITEDIGESTION
COMPOST FACILITY
CO
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BU
S’ B
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• EPA Part 503 - Biosolids Rule
• Approximately 50% of all biosolids produced in the United States are applied to land to improve soils.
• Applied to less than 1% offarm fields.
LAND APPLICATION
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Need storage to make the system work.
SEASONAL LAND APPLICATION PERIODS
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Black & Veatch
JANUARY FEBRUARY MARCHSun Mon Tues Wed Thur Fri Sat Sun Mon Tues Wed Thur Fri Sat Sun Mon Tues Wed Thur Fri Sat
1 2 1 2 3 4 5 6 1 2 3 4 5
3 4 5 6 7 8 9 7 8 9 10 11 12 13 6 7 8 9 10 11 12
10 11 12 13 14 15 16 14 15 16 17 18 19 20 13 14 15 16 17 18 19
17 18 19 20 21 22 23 21 22 23 24 25 26 27 20 21 22 23 24 25 26
24/31 25 26 27 28 29 30 28 29 27 28 29 30 31
APRIL MAY JUNESun Mon Tues Wed Thur Fri Sat Sun Mon Tues Wed Thur Fri Sat Sun Mon Tues Wed Thur Fri Sat
1 2 1 2 3 4 5 6 7 1 2 3 4
3 4 5 6 7 8 9 8 9 10 11 12 13 14 5 6 7 8 9 10 11
10 11 12 13 14 15 16 15 16 17 18 19 20 21 12 13 14 15 16 17 18
17 18 19 20 21 22 23 22 23 24 25 26 27 28 19 20 21 22 23 24 25
24 25 26 27 28 29 30 29 30 31 26 27 28 29 30
JULY AUGUST SEPTEMBERSun Mon Tues Wed Thur Fri Sat Sun Mon Tues Wed Thur Fri Sat Sun Mon Tues Wed Thur Fri Sat
1 2 1 2 3 4 5 6 1 2 3
3 4 5 6 7 8 9 7 8 9 10 11 12 13 4 5 6 7 8 9 10
10 11 12 13 14 15 16 14 15 16 17 18 19 20 11 12 13 14 15 16 17
17 18 19 20 21 22 23 21 22 23 24 25 26 27 18 19 20 21 22 23 24
24/31 25 26 27 28 29 30 28 29 30 31 25 26 27 28 29 30
OCTOBER NOVEMBER DECEMBERSun Mon Tues Wed Thur Fri Sat Sun Mon Tues Wed Thur Fri Sat Sun Mon Tues Wed Thur Fri Sat
1 1 2 3 4 5 1 2 3
2 3 4 5 6 7 8 6 7 8 9 10 11 12 4 5 6 7 8 9 10
9 10 11 12 13 14 15 13 14 15 16 17 18 19 11 12 13 14 15 16 17
16 17 18 19 20 21 22 20 21 22 23 24 25 26 18 19 20 21 22 23 24
23/30 24/31 25 26 27 28 29 27 28 29 30 25 26 27 28 29 30 31
• Two 28 day application periods per year
• Mon – Sat 10 hour shifts
• Actual application period is closer to 16-20 days per period due to weather limitations
SCHEDULE AND KEY DECISIONS
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SCH
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• August 2014 - Award of Design Contract
• March 2015 - Advertisement for Construction • June 2015 - Notice to Proceed • Construction Milestones (8 total)
• January 2016 - Land Application Tanks No. 1 and 4 ready for storage
• March 2016 - MACT Compliance; incinerators offline, cake piping modifications complete
• May 2016 - Land Application Tanks No. 2 and 3 ready for storage
SCHEDULE CHALLENGES29 June 2016
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SCH
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• 1 – Biosolids Thickening Operation Evaluation
• 2 – Liquid Biosolids Volume Evaluation
• 3 – Liquid Biosolids Storage Siting Evaluation
• 4 – Liquid Biosolids Truck Load-Out Evaluation
• 5 – Stored Biosolids Consistency Evaluation
• 6 – Biosolids Odor Mitigation Evaluation
• 7 – Cake Loadout Silo Operation Evaluation • 8 – Biosolids Cake Storage Evaluation
2 MONTHS OF TECHNICAL MEMOS –DECISIONS IN RAPID SUCCESSION
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Black & Veatch
BIOSOLIDS LAND APPLICATION FACILITY
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BIO
SOLI
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D A
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LIC
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ION
FA
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ITY
LAND APPLICATION SOLIDS PROCESS FLOW
29 June 2016Black & Veatch
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BIO
SOLI
DS
LAN
D A
PP
LIC
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ION
FA
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BIOSOLIDS LAND APPLICATION FACILITY (BLAF)
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Black & Veatch
Repurposed existing thickening centrifuges
3 bay truck loading station(~86 truck loads per day)
Centralized pump and control building
for truck loadout
4 biofilters for odor control and tank ventilation
Four 2 million gallonthickened 8-10% TS
biosolids storage tanksNew thickened
biosolids pumps and repurposed conveyance
(~1000 lf)
BIO
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• City of Columbus has a contractual agreement with their land application vendor to provide 8-10% thickened solids• Higher solids % is preferred to minimize trucking costs
• 8-10% TS is atypical for the industry • Typical programs utilize either liquid injection of 5-6%
TS, or mechanical spreading of dewatered cake (20-35% TS)
• Non-Newtonian fluid • Difficult to determine the exact operational characteristics
8 – 10% CLASS B THICKENED BIOSOLIDS29 June 2016
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8-10% Thickened Biosolids Sample Collection
BIO
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Collected data on site specific solids characteristics
• Rheology – the science of the deformation and flow of fluids, particularly non-Newtonian
• Non-Newtonian – a fluid whose viscosity is dependent on shear rate
• Solids samples were collected and sent to the ATS Rheo Systems for analysis
• Rheological data used to calibrate hydraulic calculations and model • Coefficient of Rigidity • Yield Stress
• Field pump test results were used to verify model
RHEOLOGY TESTING29 June 2016Black & Veatch
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New Thickened Biosolids Pump
BIO
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• Pump testing concluded much higher system pressures than original hydraulic calculations• Replace existing rotary lobe
thickened biosolids pump equipment with new progressing cavities• 4 Stage Progressing Cavity Pumps• 225 gpm @ 200 psi
• Field Observations:• Large harmonic vibrations
(pipe supports)
PUMP AND SYSTEM TESTING RESULTS
29 June 2016Black & Veatch
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Land Application Control Building
Biosolids Truck Loading Pump Construction
BIO
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FA
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Largest units that Moyno makes
• 8 Progressing Cavity Pumps• 2 stage• 1,000 gpm @ 100 psi• 125 hp motor
TRUCK LOADING AND TANK RECIRCULATION
29 June 2016Black & Veatch
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BIO
SO
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ND
AP
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CA
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AC
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BIOSOLIDS LAND APPLICATION FACILITY (BLAF)
29 June 2016
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Black & Veatch
BIO
SOLI
DS
LAN
D A
PP
LIC
AT
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FA
CIL
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LAND APPLICATION CONTROL BUILDING
29 June 2016
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BIO
SOLI
DS
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PP
LIC
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FA
CIL
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Biofilter – Smoke Testing
Access Bridge Aluminum Tank Cover
Biofilter – Lava Rock and Pine Bark
BIO
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LIC
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FA
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BIO
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27Truck Loading Station
LESSONS LEARNED
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Centrifuge OptimizationPipe Supports Tank Mixing
LESS
ON
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CENTRIFUGE OPTIMIZATION
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29 June 2016Black & Veatch
THICKENED BIOSOLIDS PUMP DATA
Flow (gpm) Pressure (PSIG)
Solids Percentage
Modeled 225 185 9.5%
Field Measured 150 150 8.5%
FieldMeasured 60 200 Slightly
Above 10%
UNEXPECTED VARIATIONEXCEEDED PUMP
PRESSURE INTERLOCK
LESS
ON
S LE
AR
NE
D
• 8% 10%
• Centrifuge Operational Parameters• Solids Feed Rate• Polymer Quality• Relative Speed• Pond Depth
• Very tight TS tolerances are tricky to achieve
CENTRIFUGE OPTIMIZATION
29 June 2016Black & Veatch
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LESS
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• Large harmonic vibrations noticed during pump testing
• Concerns for existing and new systems
• Contractor contingency was provided to analyze existing support systems due to design deadline constraints
• Performed dynamic analysis for vibration for new and existing systems conveying 8-10% thickened solids
PIPE SUPPORT DESIGN
29 June 2016Black & Veatch
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LESS
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• Minimize slugs of non-uniform biosolids
• Provide uniform characteristics within each truck• Avoid discrepancies in % solids samples taken for reporting
and actual % solids applied• Difficulty with truck loading (getting solids to the pump inlet)• No mixing systems identified that will guarantee
performance at 8-10% solids
• … Tank Recirculation
DRIVERS FOR TANK MIXING
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29 June 2016Black & Veatch
Keep the material moving!
LESS
ON
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AR
NE
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TANK RECIRCULATION AND GEOMETRY
29 June 2016Black & Veatch
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Minimize SuctionPiping
Minimum 4:1 Floor Slope
Tank Recirculation
LESS
ON
S LE
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D
TANK RECIRCULATION AND GEOMETRY
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LESS
ON
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WHAT’S AT THE END OF THE RAINBOW?
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LESS
ON
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BIOSOLIDS LAND APPLICATION FACILITY (BLAF)29 June 2016Black & Veatch
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