hrsd’s regional biosolids...hrsd’s regional biosolids management program tomorrow and the day...
TRANSCRIPT
HRSD’s Regional Biosolids
Management Program
Tomorrow and the Day After
Christopher Wilson, Ph.D., P.E.
2017 VWEA Education Seminar
Collaborative Biosolids: Fuel for Thought
May 11, 2017
This presentation gives an overview of a truly regional
approach to biosolids management in Virginia
Where We’ve Been Where We Are Where We’re Going
This presentation gives an overview of a truly regional
approach to biosolids management in Virginia
Where We Are Where We’re GoingWhere We’ve Been
(Our Historical BMP)
4
HRSD’s Multiple Hearth Incinerator Plants:- Williamsburg (20.5 DTPD)
- Boat Harbor (13.5 DTPD)
- VIP (25.6 DTPD)
- Army Base (8.6 DTPD)
- Chesapeake-Elizabeth (17.0 DTPD)
WBTP
BHTPABTP
VIP
CETP
5
HRSD’s Anaerobic Digestion Plants:- James River (10.3 DTPD)
- York River (13.1 DTPD)
- Nansemond (29.4 DTPD)
- Atlantic (42.9 DTPD)
JRTP
YRTP
NTP
ATP
6
HRSD’s Contract Composting Plants:- James River (10.3 DTPD)
- York River (13.1 DTPD)
- Nansemond (29.4 DTPD)
JRTP
YRTP
NTP
7
HRSD’s Solids Receiving Facilities:- Boat Harbor
- Army Base
- VIP, receiving…
- Nansemond (29.4 DTPD)
BHTPABTP
VIPNTP
This presentation gives an overview of a truly regional
approach to biosolids management in Virginia
Where We’ve Been Where We Are
(What’s Driving Change?)
Where We’re Going
There are unrelated-to-biosolids initiatives that will
fundamentally change our Solids Management Plan
Why… …matters for biosolids
There are unrelated-to-biosolids initiatives that will
fundamentally change our Solids Management Plan
Re-categorization of MHI under CAA 129 MACT Standards
Large cost to bring MHI facilities into compliance (March ’16)
Significant exceedance risk and operational intensity
Potential closure (repurpose?) of ABTP MHI facility
Why… …matters for biosolids
There are unrelated-to-biosolids initiatives that will
fundamentally change our Solids Management Plan
120 MGD of managed aquifer recharge
Water treatment residuals management
Flow redirection/plant consolidation
Additional nutrient requirements
Granular carbon regeneration opportunities
Why… …matters for biosolids
There are unrelated-to-biosolids initiatives that will
fundamentally change our Solids Management Plan
Closure of Chesapeake-Elizabeth Plant TP in 2021
Continuing efforts to improve BNR at Boat Harbor TP
Nutrient recovery and lifecycle:
− Land Application and Struvite Recovery
Why… …matter for biosolids
HRSD is about to begin construction to expand the
processing capacity of Atlantic using Thermal Hydrolysis
13
▪ 17 DTPD of solids transfer from Chez-Liz to Atlantic by 2021
▪ Currently, there is no room for all of that cake…
23 February, 2013
Atlantic Treatment Plant Cake pads with Spring approaching…
HRSD is about to begin construction to expand the
processing capacity of Atlantic using Thermal Hydrolysis
15
▪ 17 DTPD of solids transfer from Chez-Liz to Atlantic by 2021
▪ Currently, there is no room for all of that cake…
▪ Thermal Hydrolysis will allow ATP to:
− Increase volatile solids destruction
− Improve dewaterability
− Provide Class A “EQ” product to manage (again!!)
− Provide lots of future opportunities…
16Transfer of CETP flow to ATP upon closure
ATP
CETP Via flow
transfer
Raw Solids
Loading
(DTPD)
◄ 71 DTPD
92 DTPD ►
21 DTPD Reserve
Capacity in THP
◄ 110 DTPD
Related to SWIFT and MACT 129 Compliance, HRSD is
exploring closure of the ABTP incinerator complex
17
▪ Estimated $250,000 savings in personnel and chemical costs
− Investment paid back in 5-6 years
▪ Improved BNR operations at ABTP; eliminate sidestream (HCN)
▪ Investigating conversion of MHI to regional Carbon Regeneration
facility
18
▪ BHTP is the “primary” for NTP
▪ ABTP was the “backup” for NTP.
▪ VIP was the “backup to the backup”.
▪ If ABTP furnace is shuttered, contract
composting is the backup to the backup…
cost implications.
BHTPABTP
VIPNTP
19
2022 State of the District:- 2030 raw solids projection basis
- Heavily dependent on BHTP and VIP furnaces
- Contract composting continues to be big
- Increased beneficial reuse, esp. Class A “EQ”
BHTP
VIP (incl. ABTP)NTP
JRTP
YRTPWBTP
ATP (incl. CETP)
Raw Solids
Loading
(DTPD)
59.9
DTPD
23.4
DTPD
90.2
DTPD
ABTP
This presentation gives an overview of a truly regional
approach to biosolids management in Virginia
Where We’ve Been Where We Are Where We’re Going
(LOTS of “What ifs”)
Major drivers for HRSD will continue to guide solids
management decisions well after 2022
21
Our incinerators are aging.
Most solids are still incinerated.
Boat Harbor is not reliably BNR.
Boat Harbor is our #2 solids
processing facility, by mass.
Our dewatering equipment is aging.
Importing solids to Atlantic requires
solids screening/loadout additions.
Our capacity is pretty much tapped.
Depending on how you look, Atlantic
has a little or A LOT to give.
We’re entering a world of uncertainty…but let’s make
some wild assumptions and see where they take us!!
▪ First Assumption: Solids Receiving Facility at Atlantic
− Recapture up to 21 DTPD capacity of initial THP installation
− Requires addition of solids screening to source plant
− ABTP Centrifuges: 39-44 years old
Raw Solids
Loading
(DTPD)
◄ 71 DTPD
92 DTPD ►
21 DTPD Reserve
Capacity in THP
◄ 110 DTPD
23
BHTP
VIPNTP
JRTP
YRTPWBTP
ATP
Raw Solids
Loading
(DTPD)
59.9
DTPD
23.4
DTPD
90.2
DTPD
2030 Base Scenario
ABTP
24
BHTPABTP
VIPNTP
JRTP
YRTPWBTP
ATP
Raw Solids
Loading
(DTPD)
68.5
DTPD
23.4
DTPD
81.6
DTPD
2030 ABTP Transfer Scenario
We’re entering a world of uncertainty…but let’s make
some wild assumptions and see where they take us!!
▪ Second Assumption: Second THP Train at Atlantic
− Additional 92 DTPD capacity through thermal hydrolysis
− Additional screening at source plants (e.g. VIP and NTP)
− Larger solids hopper, sludge storage, etc. at Atlantic
26
BHTPABTP
VIPNTP
JRTP
YRTPWBTP
ATP
2030 ABTP Transfer Scenario
Raw Solids
Loading
(DTPD)
68.5
DTPD
23.4
DTPD
81.6
DTPD
27
BHTPABTP
VIPNTP
JRTP
YRTPWBTP
ATP
Raw Solids
Loading
(DTPD)
123.5
DTPD
23.4
DTPD
26.6
DTPD
2030 ABTP, NTP & VIP
Transfer Scenario
Although there is a ton of uncertainty, recent projects
clearly put HRSD in the solids management driver’s seat
28
▪ Cost-wise, this seems to work out but lots more business case
development is needed.
▪ HRSD is revising its most recent Biosolids Management Plan in
concert with SWIFT.− Assumption 3: 2nd Regional Solids Facility at Nansemond TP?
− Assumption 4: …
− Assumption 5: …
− …
In summary, our truly regional approach to solids
management will continue to be a flexible one
29
▪ Nutrient reduction, SWIFT, and aging equipment have set the
stage for change.
In summary…
30
In summary…
▪ Cost evaluation almost always prefers operating fewer solids
management facilities.
Additional consolidation seems
the likely trend.
In summary, our truly regional approach to solids
management will continue to be a flexible one
31
In summary…
▪ THP is a big part of the plan – it builds capacity to
divert from existing furnaces as needed and gets us
back into the biosolids beneficial reuse game.
Welsh Water Cardiff WwTW
Thank you!!
Christopher Wilson, Ph.D., P.E.
2017 VWEA Education Seminar
Collaborative Biosolids: Fuel for Thought
May 11, 2017