net-zero roadmap: how water resource recovery facilities
TRANSCRIPT
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In the kNOW Webinar Series
Net-Zero Roadmap:How Water Resource RecoveryFacilities Contribute to theOverall DecarbonizationStrategy
September 15, 2021
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Presenters
Emma ShenJacobs, Global Technology Lead for Wastewater Energy Optimization andSector Decarbonization
Jeff CarmichaelMetro Vancouver, Division Manager, Business Development Group
Per Henrik NielsenVCS Denmark, Project Director
Amanda LakeJacobs, European Regional Wastewater Solutions Lead
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Latest Trends in Decarbonizingthe Wastewater Sector
Emma ShenJacobs Global Technology Lead – Wastewater EnergyOptimization and Sector Decarbonization
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WRRFs Become Part of the Solution for Decarbonizing Our Future
©Jacobs 20214
Energy embedded in wastewater isalmost five times the energy demandrequired for treating wastewater itself.
WRRFs offer immense opportunities toreduce energy and carbon footprintthrough operational optimization andadaptation of innovative processes.
(Beyond) Net-Zero WRRF is no longerjust a vision for “utilities of the future”.
Source: https://www.globalwaterintel.com/news/2021/32/is-net-zero-now-water-s-biggest-priority
WaterResources
20%
Desalination9%
WaterTreatment
13%Water
Networks32%
WastewaterNetworks
7%
WastewaterTreatment
18%
Sludge Management1%
Energy Consumption Breakdown in Water Sector (GWI, August 2021)
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GHG Sources at WRRFs
©Jacobs 20215
Sewer System
Raw SewagePumping Station
HeadworksPrimary Clarifiers Aeration Tanks
Sludge Thickening Anaerobic Digestion
Biogas Combustion
Biosolids Dewatering
Biosolids Management
Secondary Clarifiers
Effluent Discharge
Biogas energyrecovery
Biosolids beneficial reuse orresource recovery
Carbon dioxide (CO2)GWP = 1
Methane (CH4)GWP = 28
Nitrous Oxide (N2O)GWP = 265
Adopted from WEF Factsheet “GHG Sources and Sinks for WRRFs” (2021)GWP: Global Warming Potential
Other emission sources: Consumption of
purchase energy (e.g.,electricity, natural gas,fuel oil) Diesel fuel (e.g.,
vehicles) Refrigerants Chemicals
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Energy Recovery from Biogas Should be the Baseline
©Jacobs 20216
No biogas should be flared (wasted)!
Combined heat and power (CHP) or renewable natural gas (RNG) – market driven
High carbon intensity for local power grid (e.g.,coal, natural gas)
High electricity cost Subsidies for renewable generation
Low carbon intensity for local power grid (e.g.,nuclear or hydro)
Carbon tax or incentives for GHG emissionreduction
BiogasCHP RNG Production
Electricity generation – typically enoughdemand onsite (offset)
Heat reuse onsite
RNG (biomethane) - grid injection or used asvehicle fuel
Renewable heat onsite and offsite
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Innovative Technologies to Boost Biogas Production
©Jacobs 20217
Micro Hydrolysis Process (MHP)
Innovative anaerobic digestion technology developed by Jacobs incollaboration with Verde Technologies and Brigham Young University
Use of Caldicellulosiruptor Bescii (C. Bescii), a hyper-thermophilic anaerobicbacteria, to hydrolyze cellulose and other recalcitrant biomass
Lab-scale and pilot testing show promising results:
>70% volatile solids reduction
25% more biogas production
25% less biosolids generation
Improved dewaterability
First full-scale implementation planned atthe Clinton River WRRF (Oakland County,Michigan) after successful pilot
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Converting Biosolids to Low Carbon Intensity Fuel
©Jacobs 20218
Pyrolysis – converting biosolids into gas (syngas), liquid (bio-oil) and biochar
Parry et al., 2020. Circular Biochar Economy. WEFTEC Connect
Pyrolysis Equipment at Silicon Valley Clean Water WRRF(California)
Integrated Thermal Process (Fluid Lift Gasification™) atMorrisville Municipal Authority Facility (Pennsylvania)
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Sewer Thermal Recovery
©Jacobs 20219
Sewer - low-carbon, reliable source for heating and cooling Every 1 MGD of wastewater provides approximately 0.9 MW heating/cooling capacity
(based on 5 °C deltaT)
Offsets GHG emission from conventional natural gas heating/electrical cooling
Reduces thermal pollution in waterways
Scalable – from individual building to district energy system (DES) application
PIRANHA - small system serving25 to 200 residential units(Courtesy: SHARC)
In-pipe heat recovery, applied with newinstallation or replacing sewers(Courtesy: Rabtherm)
Architectural rendering for National WesternCenter (Denver, CO) – 3.8 MW sewer thermalDES under construction
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Renewable Microgrid with Energy Storage
©Jacobs 202110
Independent from a central grid, with localenergy generation, storage and intelligentcontrols Renewable energy sources:− Solar− Biogas (cogen)− Hydrogen Key benefits for WRRFs:− Increases site resilience and redundancy− Reduces energy cost− Reduces GHG emissions− Might help build a local solar or hydrogen
industry with new jobs
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WRRF-Based Hydrogen Hubs
©Jacobs 202111
Jacobs Yarra Valley Water Whitepaper:https://www.jacobs.com/sites/default/files/2020-06/jacobs-yarra-valley-water-towards-a-zero-carbon-future.pdf
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Metro Vancouver Climate ActionREGIONAL PLANS AND LIQUID WASTE SERVICES INITIATIVES AND PROJECTS
Jeff CarmichaelDivision Manager, Business Development,Liquid Waste Services
15 September 2021
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DRIVERS FOR CLIMATE ACTION
13
Climate 2050: Metro Vancouverdemonstrates bold leadership inresponding to climate change• Carbon neutral region by 2050• Infrastructure, ecosystems and
communities are resilient to theimpacts of climate change
Energy Management PolicyBoard Strategic PlansLiquid Waste Management Plan
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Regional greenhouse gas emissionsCAUSES OF CLIMATE CHANGE
14
Dominated by vehicle and buildingemissions
Somewhat unique low-GHGhydroelectricity
Non-energy related emissions arepoorly understood, so not includedin current reporting protocols.
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Greenhouse GasesESTIMATED EMISSIONS IMPACT
15
Goal:45% region-wide emissionsreduction by 2030
Goal:45% region-wide emissionsreduction by 2030
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REDUCING LIQUID WASTE GHG EMISSIONS
16
Residualsmanagement
Fleet and LWSvehicles
Buildings Construction
Wastewaterconveyance
Wastewatertreatment
• Natural gas use• Purchased electricity• Diesel use• Embodied emissions• Fugitive N2O• Fugitive methane
• Purchased electricity• Embodied emissions• Potential fugitive
methane
• Gasoline and diesel• Embodied emissions
• Gasoline and diesel• Embodied emissions
• Gasoline and diesel• Embodied emissions• Natural gas use
• Purchased electricity• Diesel use• Embodied emissions
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USING LIQUID WASTE RESOURCES TO REDUCEREGIONAL EMISSIONS
17
Biosolids aslandfill cover and
carbon sink
Energy sources:• Renewable natural gas
• Sewer / effluent heat
• Co-generation
• Biofuel
• Biosolids as fuel
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Action Protocol: Carbon Price Policy Methodology
• Policy establishes a price ($150/tonneCO2e) on applicable GHG emissions
• Value of GHGs associated with aproposed project or initiative can becalculated
• Intent to use Life Cycle Cost Analysis toquantitatively compare options
• Use process in place but no checks toensure participation
18
Project/Initiative:options analysis
Option A Option B
Capital $Op. $
Project lifeGHGs
Life-cyclecost A
Life-cyclecost B
Capital $Op. $
Project lifeGHGs
X
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Photo Caption hereSEWER HEATINITIATIVES
5
10
15
20
25
Aver
age
Dai
ly Te
mpe
ratu
re (°
C)
Metro Vancouver WWTPs - Effluent Sewage Temperature
Annacis IslandIonaLions GateLulu IslandNorthwest Langley
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SEWER HEAT: CURRENT AND FUTURE CAPACITY
0
50
100
150
200
250
300
350
400
450
0
10
20
30
40
50
60
70
Annacis Island Iona Island North Shore Lulu Island
# of
hig
h-ris
e bu
ildin
gs s
ervi
ced
MW
Currentcapacity:700 high risebuildings
Futurecapacity:950 buildings
North ShoreEffluent Heatproject indesign now
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HIGH-EFFICIENCY AERATION
21
2020 and earlier activities• Identified HEA technology w/ improved performance for energy use reduction• Project funded under MV Sustainability Innovation Fund (SIF)• Negotiated scope of work for demonstration testing at DC Water
2021 activities• Execute contract for demonstration testing• Design pilot facility modifications• Procure fluidic oscillator and initiate construction
Future activities• Install and test Perlemax fluidic oscillator• Complete WRF third-party independent assessment
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HTL – PRODUCTION OF BIOFUEL
22
2021 activities• Complete procurement for HTL unit design and fabrication• Complete preliminary design of outside battery limits• Continue work with Industrial Research Chair at UBC Okanagan to identify how to best integrate HTL into
WWTP operations
Future activities• Construction, installation and testing of HTL pilot at AIWWTP• Investigation of low carbon phosphorus and nitrogen compounds for use as fertilizer with UBC
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BIOGAS UPGRADING: CURRENT AND PLANNED SYSTEM
digestersanaerobicdigesters
sewage biogas
boilersheat for buildingsand digesters
System
SludgeGas
TreatmentSystem
RNG FortisBCpipeline
flare
heatexchanger(s)
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Photo Caption hereBUSINESS CASE ANALYSIS
• 25-year equipment life
• Estimated $11M capital costs
• Initial RNG sales $630,000 /yr
• Initial O&M costs $150,000 /yr
• Carbon price policy benefits $380,000 /yr(average 2,500 tonnes CO2e per year)
• Positive business case and cash flow
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GHG Reduction Potential
1 in 4potential
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Thank you. [email protected]
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Beyond Energy NeutralityProgram: Achieving EnergyIndependence in a LargeWater Resource RecoveryFacility
Per Henrik NielsenVCS Denmark, Project [email protected]
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Ejby Mølle WRRF
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Ammonia-Based Aeration Control Played Key Role in EnergyOptimization of BNR Process
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Maximizing Biogas Utilization
• Additional engine generation capacityfully utilized produced biogas
– More electrical production– More heat recovered
• Reduced carbon footprint from flaring
• Carbon redirection
30
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Beyond Energy Neutrality Program: Engaging GlobalInput for Collaborative Process Optimization at Ejby Molle
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Screen, Grit, and Grease3.88% Primary Treatment
3.09%Pumping to
Trickling Filters2.15%
Pumping to ActivatedSludge5.80%
Trickling Filters -Stage 2 pumping
7.30% Trickling Filters -Recirculation pumping
4.73%Trickling Filters -
WAS/Humus Pumping0.01%
Trickling Filters - ReturnPumping to Act Sludge
0.64%
Activated Sludge -Anaerobic Zone Mixers
1.78%Activated Sludge -
Oxidation Ditch Aeration39.35%
Activated Sludge -Oxidation Ditch Mixing
2.09%
Activated Sludge -RAS Pumping
0.86%
Activated Sludge -WAS Pumping
0.22%
Activated Sludge- Other0.24%
Effluent Filters10.43%
Sludge Storage1.56%
Anaerobic Digestion3.83%
Thickening/DewateringCentrifuges
6.44% Other5.59%
Ejby Mølle WWTP 2011 Annual Average Electricity Consumption
Detailed Historic Energy Consumption and GenerationData Key in Evaluating Optimization Opportunities
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75% 80% 85% 90% 95% 100% 105% 110% 115% 120%
Existing Condition (Baseline)
No Trickling Filters
Lower Bioreactor Sludge Age
Partial Effluent Filtration
Chemically Enhanced Primary Treatment
All Operational EOOs
All Operational EOOs + Anammox + Diffusers
Energy Produced 2011 Additional Energy Produced Additional Energy Saved
Energy Self-Sufficiency
Readily Implementable Optimization OperationalModifications Showed Potential for Achieving Neutrality
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-
1,000,000
2,000,000
3,000,000
4,000,000
5,000,000
6,000,000
7,000,000
8,000,000
9,000,000
kWh/year
Implementing Several EOOs Achieved Energy Self-Sufficiency by the End of 2013
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VCS Energy Consumption 2011-2019
-20,000,000
-15,000,000
-10,000,000
-5,000,000
0
5,000,000
10,000,000
15,000,000
2011 2012 2013 2014 2015 2016 2017 2018 2019
kWh Energy consumption 2011 - 2019 VCS Denmark
Vehicles internal + external
Administration
Heat consumption
Watersupply
Sewer system
Wastewater Treatment Plants
Solar panels
Power production biogas
Heat production biogas
Net consumption VCS
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-20,000,000
-15,000,000
-10,000,000
-5,000,000
0
5,000,000
10,000,000
15,000,000
2011 2012 2013 2014 2015 2016 2017 2018 2019
kWh Energy consumption 2011 - 2019 VCS Denmark
Vehicles internal + external
Administration
Heat consumption
Watersupply
Sewer system
Wastewater Treatment Plants
Solar panels
Power production biogas
Heat production biogas
Net consumption VCS
2020Heat pumps at outlet
from EM WRRF
Replace sludge storagetank at EM
Thermal hydrolyses (tobe decided)
2011Merger with
NordfynsSpildevand
Mixing indigestersreduced
Shut downsludge
dewateringHaarslev
2013Sludge from
NE and NW toEM
Gas engine 2installed
Water from oilmill redirectedto EM instead
of Otterup
2014Demon /
sidestreamtreatment
Activatedsludge
pumpingstation
2016Ventilation and
heatersoptimized at
rainwaterpumps
Bottom aerationNW
2018Sludge fromOtterup and
HofmansgaveWRRF to NW
New mixers inaerationtankat Bogense
WRRF
2010Decision CO2
neutral in2014
EM newsludge
dewatering
2012Workshop with Jacobs
Insulation of digester walls
Heat recovery fromtransformer in machine shop
Shut down sludgedewatering Hofmansgave
2015Sludge / sludgeheat exchangersafter digesters
2015 + 2016High priority on
sewerinvestments
2017Changed motors for
rotors at NE
Recuperative sludgedewatering
Changed pipebetween sludgebuffer tank and
digester (Higher drycontend)
2019Gas engine 1 from
2009 renovated
RefurbishFilterpumpingstation (new
pumps and heatrecovery fromtransformers
VCS Energy Consumption 2011-2019
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Influent PrimaryClarifier
WAS
Bioreactor (aerobic/anoxiczones)
EffluentNOB out-selection
MainstreamWAS
Hydrocyclones
Sidestream Reactor
AOB and anammox ”seed”(bioaugmentation)
DewateringCentrate
SecondaryClarifier
MainstreamHydrocyclones
Leveraging Deammonification for Both Sidestreamand Mainstream Nitrogen Control
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Induced Granulation and Sidestream BioaugmentationImproved Sludge Settleability
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Intermittentaeration
continuousaeration
It's Not Energy Reduction at the Expense of theEnvironment: N2O Probe Development and Application
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Further DevelopingEmerging Technologies:MABR Demonstration
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First drying, using super heated steam, and then pyrolysis of the sludge
The energy source is the organic content inthe sludge.The calorific value in the sludge is utilized byburning the pyrolysis gasses.
The end product is a biochar/soil improver with plant available phosphorus,and can be processed into activated carbon (filter material)
…and excess thermal energy, fordistrict- or local heating
1
2
What About Biosolids?
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Ejby Mølle WWTP circa 1956
Summary Thoughts and Conclusions
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Decarbonisation in the UK
Amanda LakeJacobs European Regional Wastewater Solutions Lead
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Decarbonisation in the United Kingdom
2019- Pledge to net zero 2030
2020– 2030 Net zero routemap
2021– Individual company netzero routemaps
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Importance of Scope 1 Process Emissions
©Jacobs 202145
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Global Industry and Research Efforts to Date
©Jacobs 202146
France Netherlands
Switzerland
Australia
Denmark
United Kingdom
Finland
ItalySpain
Austria
US
China
Sweden
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What We Know So Far
©Jacobs 202147 ©Jacobs 202047
(Vasilaki et al. 2019)
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Mitigating Nitrous Oxide Emissions
©Jacobs 202148 ©Jacobs 202048
Full scale modelling and mitigation Investigating drivers and solutions
Vasilaki et al. (2018)
De Haas & Ye (2021)
Duan et al. (2020)
Evolution in industryemission factors
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Mitigating Methane Emissions
©Jacobs 202149 ©Jacobs 2021
Delre et al. (2017)
Off site characterisation
On site mitigationAvfall Sverige (2019)
Holmgren et al. (2015)DBFZ (2019)
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Emerging Approaches
50 ©Jacobs 2020
Knowledge Base
Peer reviewedliterature
Risk AssessmentN2O before
N2O afterMitigation
Courtesy Cobalt Water Global
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Challenges and Opportunities
©Jacobs 202151
Monitoring methods Cost benefit of mitigation Collaboration for climate action
Duan et al. (2020)
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Q&A
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Thank You
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