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![Page 1: NC AWWA-WEA 93rd Annual Conference November 12, 2013 Tim Woody Resource Recovery Division Director, City of Raleigh Jonathan Treadway P.E, BCEE, CDM Smith.](https://reader037.fdocuments.in/reader037/viewer/2022110206/56649d0d5503460f949e234a/html5/thumbnails/1.jpg)
NC AWWA-WEA 93rd Annual Conference
November 12, 2013
Tim WoodyResource Recovery Division Director, City of Raleigh
Jonathan TreadwayP.E, BCEE, CDM Smith
TAKE 2 – BIOSOLIDS STRATEGY MODIFICATIONS FOR THE CITY OF RALEIGH TO TAKE ADVANTAGE OF
TECHNOLOGY ADVANCEMENTS
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NC AWWA-WEA 93rd Annual Conference
Presentation Outline
1. Project Background and Objectives2. Biosolids Management Alternatives3. Selected Project Direction4. Implementation Plan5. Conclusion
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NC AWWA-WEA 93rd Annual Conference
City of Raleigh provides wastewater service to nearly 500,000 people
• Neuse River WWTP– 44 mgd average
• Smith Creek WWTP– 1.2 mgd
• Little Creek WWTP– 0.7 mgd average
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NC AWWA-WEA 93rd Annual Conference
Goals for Master Plan Update
• Identify financially feasible management strategy• Demonstrate cost-effectiveness compared to the
“base case”• Update 2008 Biosolids Master Plan with new
technologies• Account for changing conditions• Advance the goals of the City’s EMS program for
biosolids
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NC AWWA-WEA 93rd Annual Conference
Changing Conditions Driving Update
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NC AWWA-WEA 93rd Annual Conference
Changing Conditions Driving Update
2008
2012
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NC AWWA-WEA 93rd Annual Conference
Overview of Management Strategies Considered
Alternative Management Strategy1 Base Case*
2 Anaerobic Digestion + Solar Drying3 Thermal Hydrolysis + Anaerobic
Digestion + Solar Drying
* Base case includes diversified outlets:• Alkaline stabilized Class A product (Raleigh-Plus)• Third party composting• Aerobically digested Class B product• Landfill
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NC AWWA-WEA 93rd Annual Conference
Management StrategiesAlt. 1 - Base Case (Aerobic Digestion)
7 DT/day
57 DT/day
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NC AWWA-WEA 93rd Annual Conference
Management StrategiesAlt. 2 - Anaerobic Digestion + Solar Drying
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40 DT/day
New Facilities Include:• New GBT Building• Three An. Digesters (2.75 MG each)• Biogas Storage• Upgraded Dewatering• 16 Solar Dryers
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NC AWWA-WEA 93rd Annual Conference
Management StrategiesAlt. 3- Thermal Hydrolysis + Anaerobic Digestion + Solar Drying
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New Facilities Include:• Pre-screening and Pre-dewatering• Thermal Hydrolysis Equipment• Two An. Digesters (1.6 MG each)• Upgraded Dewatering • Biogas Storage• 8 Solar Dryers
32 DT/day
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NC AWWA-WEA 93rd Annual Conference11JT
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NC AWWA-WEA 93rd Annual Conference
Comparison of Alternatives - 20 year net present worth
Alt. No.
Description Capital Cost($M)
O&M Cost($M)
Total Cost($M)
2008 An. Digestion + Thermal Drying $153.4 $43.6 $197.0
1 Base Case $ 28.3 $82.1 $110.4
2 An. Digestion + Solar Drying $ 97.5 $ 34.1 $131.6
3Thermal Hydrolysis + An. Digestion + Solar Drying
$ 81.2 $ 27.6 $ 108.8
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NC AWWA-WEA 93rd Annual Conference
Evaluation Criteria and Summary of Results
Alt. No.
Description Net Present Value of
Costs($M)
O&M Cost per Dry Ton
Non-Cost
Criteria
Greenhouse Gas Off-
Set (metric ton
CO2/yr)
1 Base Case $110.4 $237 58% 1,000
2 An. Digestion + Solar Drying $131.6 $144 83% 5,000
3 Thermal Hydrolysis + An. Digestion + Solar Drying $ 108.8 $140 82% 14,000
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Non-cost factors include: 1) regulatory requirements, 2) public health and environmental impacts, 3) outlet diversification, 4) operator friendliness, 5) ease of maintenance, plus 6 others.
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NC AWWA-WEA 93rd Annual Conference
Recommended ImprovementsPre-Screening Platform
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• Free-standing outdoor structure
• Two mechanical screens for co-settled sludge on top
• Screening drop to dumpster below
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NC AWWA-WEA 93rd Annual Conference
Recommended ImprovementsPre-Dewatering Facility
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• Pre-Dewatering (2-Story Bldg.) • Cake Bins Storage (Outdoors)
– Screened solids are pre-dewatered by centrifuges – Discharged to outdoor cake bins using screw conveyors
THP FEED PUMPS
TO THPCAKE BINS
CENTRIFUGES
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NC AWWA-WEA 93rd Annual Conference
Recommended ImprovementsThermal Hydrolysis Process
PulperFlashTank
Reactors (3)Digester
Feed Pumps
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NC AWWA-WEA 93rd Annual Conference
Recommended ImprovementsAnaerobic Digesters
• Prestressed concrete tanks• 64-ft diameter• Cone bottom• Draft tube mixers mounted
to concrete cover• Digester gas flare• Adjacent digester building
for pumps, etc.• Outdoor heat exchangers for
cooling sludge from THP
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NC AWWA-WEA 93rd Annual Conference
Recommended ImprovementsFinal Dewatering Building
• Option A: Reuse Existing Facilities– Refurbish or replace 3 BFPs– Continue to operate centrifuge– Ventilation and other improvements to
mitigate corrosion problems– Can continue to use truck loading
station• Option B: New Final Dewatering
Building and Truck loading Station
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NC AWWA-WEA 93rd Annual Conference
Recommended ImprovementsSolar Dryers
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• Eight modules, 42-ft x 435-ft• Fans, louvers, controls to optimize
temperature and humidity for drying
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NC AWWA-WEA 93rd Annual Conference
Recommended ImprovementsNutrient Recovery
• Optional addition for enhanced sustainability
• Reduce sidestream loading on liquid treatment process
• Recover phosphorous• Third-party responsible for
product marketing• Can be added at any time
Photo Courtesy of Ostara
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NC AWWA-WEA 93rd Annual Conference
Recommended ImprovementsCombined Heat and Power (CHP) Engine Generator
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– Single 1.75 MW generator – Containerized units available– Optional, but recommended for
sustainability when THP is implemented– Generate electricity and heat– Requires biogas conditioning system– Engine can be purchased, leased, or
procured via 3rd-party Energy Services Co. (ESCO)
Photos Courtesy of GE
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NC AWWA-WEA 93rd Annual Conference
Recommended ImprovementsImplementation Schedule
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Phase Year Description Cost
Phase I 2016
Pre-screening, pre-dewatering, thermal hydrolysis, anaerobic digesters, CHP engine, additional cake storage
$59.3 M
Phase II 2021 Eight solar drying modules, BFP replacement and
final dewatering building improvements $26.2 M
Phase III 2028 Replace existing conveyance equipment and truck
loading station $4.3 M
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NC AWWA-WEA 93rd Annual Conference
Recommended Improvement Planvs. 2008 Master Plan
2016-2020 2021-2025 2026-2030$0
$20
$40
$60
$80
$100
$1202008 MP ($151 M) 2012 Update ($90 M)
(mill
ions
)
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THANK YOU