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HRSD’s Three Pronged Management of
Grease Trap Waste
Virginia Water Environment Association
2019 Education Seminar
May 9th, 2019
Chris Wilson, Ph.D., P.E. HRSD Chief of Process Engineering
and Research
2
WBTP
BHTP ABTP
VIP
CETP
JRTP
YRTP
NTP
ATP
From Nine Large Treatment Plants
to Three geographically advantageous
grease receiving facilities.
3
HRSD receives lots of grease trucks because:
1. HRSD serves approximately 1.7 million Virginians.
2. I-64 drains Central and Northwest VA and ends in Coastal VA.
3. Many of those people, as Virginians and Americans, like to take food
that are either soft and/or heathy and make them warm and crunchy.
4
Dated, but still
relevant, hauling
data shows relative
impact on our
plants.
5 Burn! Boat! Biogas!
Williamsburg Treatment Plant
Nansemond Treatment Plant
Atlantic Treatment Plant
Choose the form of this presentation…
Biogas!
Atlantic Treatment Plant
Choose the form of this presentation…
7
Primary influent
channel at Atlantic TP
What is the nature of
the problem?
Our current solution: Grease trap waste will be diverted to dedicated
screening facility and metered to THP pulper in dilute form
8
Rotary Screen
Odor Control Fan
Odor Control-
BiofilterOdor Control-
Carbon Filter
Off-gas
Trucked Brown
Grease FOG Transfer
Pump Screen Sump
FOG Transfer
Pump
FOG Feed Pump
to Cambi
FOG Tank
Circ. PumpRock
Trap
Grinder Raw FOG
Receiving
Tank
FOG
Storage
Tank
General process flow diagram for FOG receiving at the ATP
(from HRSD/B&C/HDR Preliminary Engineering Report, 2014)
The investment, to date, results in tanks full of screened, warm,
dilute, grease water – pretty much a resource recovery party.
After the THP/FOG project, we will derive some value from
grease while effectively managing a nuisance issue
12
$0k
$40k
$80k
$120k
$160k
$200k
AnnualAverage
Max Month Peak Two-Peak Peak Day
Estimated value of
Grease-derived
biogas via CHP
We’re aware and interested in opportunities for CNG at
Atlantic, but our interest is contingent on D3 RINs.
Wastewater Sludge
THP/Digestion
CHP/kWh Relatively low value
CNG/D5 RIN Relatively low value
Screened Grease
We’re aware and interested in opportunities for CNG at
Atlantic, but our interest is contingent on D3 RINs.
Wastewater Sludge
Screened Grease
THP/Digestion
CNG/D3 RIN HIGH value!!
ACME Grease Purification Factory
Beneficial Use Variable value
We’re aware and interested in opportunities for CNG at
Atlantic, but our interest is contingent on D3 RINs.
Wastewater Sludge
Screened Grease
THP/Digestion
CNG/D3 RIN HIGH value!!
ACME Grease Purification Factory
Beneficial Use Variable value
This is all pretty exciting for us at Atlantic, because:
1. With THP, we need to FOG to support CHP.
2. Marginally beneficial use is infinitely better than current Ches-Liz and
Atlantic FOG operations.
3. This system is bespoke for Atlantic…we get to benefit from lots of
external experience and best practices in grease receiving and
management.
4. Atlantic is our big biogas producer, and the system being built
provides flexibility for other than co-digestion if Grease-to-Fuel can
be relied upon in the future.
16 Burn! Boat! Biogas!
Williamsburg Treatment Plant
Nansemond Treatment Plant
Atlantic Treatment Plant
Choose the form of this presentation…
17 Boat!
Nansemond Treatment Plant
Choose the form of this presentation…
Source: JOC.com, Bill Mongelluzzo, Senior Editor | Feb 19, 2019
Did you know?...
The separated grease fraction of brown grease has demonstrated value. At $0.15/lb, product from NP grease loads ~ $100-150k/yr
But the value to NP has largely to do with reduced maintenance
from hauled grease currently into he headworks
This is all pretty exciting for us at Nansemond, because:
1. Nansemond is the external face of SWIFT due to the SWIFTRC.
2. Nansemond was an early installation of Ostara Pearl – still super
successful.
3. Beneficial use of brown grease makes sense – and this sets us up
with a lot of flexibility for the future (CNG/RINs, etc.)
Project is under 30% design development right now…stay tuned.
23 Burn! Boat! Biogas!
Williamsburg Treatment Plant
Nansemond Treatment Plant
Atlantic Treatment Plant
Choose the form of this presentation…
24 Burn!
Williamsburg Treatment Plant
Choose the form of this presentation…
0
200
400
600
800
1000
1200
1400
1600
1800
2000
Jan-0
5
Aug-0
5
Ma
r-0
6
Oct-
06
Ma
y-0
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De
c-0
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Jul-0
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Feb
-09
Sep-0
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v-1
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v-1
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Jun-1
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Jan-1
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Monthly Natural Gas Usage for Incineration (in Thousands of cubic feet/month)
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v-1
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y-1
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v-1
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Jun-1
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Jan-1
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Cu
bic
Fe
et
NG
x 1
00
0 p
er
mo
nth
Δ = -600 Mcf/month ($20-25k/yr @ $3/Mcf) Also… About 200 tons CO2e less per year (about 50 cars)
And…it solves a problem!
This is all pretty exciting for us at Williamsburg, because:
1. You would never build this – you probably couldn’t afford to.
2. That said, implementing this was really inexpensive because we had
most of the concrete.
3. Williamsburg takes a big grease load for the District because of its
location (…thanks Central VA)
4. Great burns hotly and the FOG refinery’s capacity isn’t without limits.
5. Probably need to think about NP as a pressure relief valve for excess
grease in the future.
6. It just works.
29 Burn! Boat! Biogas!
Williamsburg Treatment Plant
Nansemond Treatment Plant
Atlantic Treatment Plant
Choose the form of this presentation…
In summary, necessity is the mother of invention…
and the invention depends on the necessity.
HRSD’s Three Pronged Management of
Grease Trap Waste
Virginia Water Environment Association
2019 Education Seminar
May 9th, 2019
Chris Wilson, Ph.D., P.E. HRSD Chief of Process Engineering
and Research
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