On November 20th, ClearCove presented at the New York Energy Specialty Conference in Albany, NY on the results of its NYSERDA funded demonstration project.

1. Towards Net-Zero Energy in Wastewater Treatment
Demonstration of ClearCove’s
Enhanced Primary Treatment Technology
Alex Wright, ClearCove Systems & Mark Greene, O’Brien & Gere
NYWEAENERGY SPECIALTY CONFERENCE
November 20, 2014

2. Enhanced
Primary
Treatment
• Benefits
– Divert digestible material
• from secondary treatment
• to anaerobic digestion
– Higher TSS and BOD removal
– Coagulant addition leads to phosphorus
removal
• Key Impact Areas of Evaluation
– Chemical costs
– Hydraulic profile
– Readily degradable organics for N-removal
11/20/2014 1

3. Demonstration
• CCS EPT Pilot
• Anaerobic
Digestion Pilots
• Biochemical
Methane
Potential Testing
11/20/2014 2

4. EPT Pilot
• 20,000 gal/day
• Equalizes the flow
• Stops the Flow
• Removes 100% of the grit
• Removes 100% of the fibers
• Settles the high value organics
– Phys/Chem: chemical dosing and gravity
– Colloidal capture
• Filters the effluent
– 50 micron screen
– Membrane Operation Benefit
• Removes the sludge to a classifying press
– Removes additional digestible organics
– Removes and dewaters gross matter
11/20/2014 3

5. EPT Pilot
• Wastewater pumped from
influent channel of IAWWTF
• Wastewater enters both sides of
the tanks through the Influent
Feed Chamber.
• Grit and dense solids settle out
• Wastewater flows over 70
degree weirs into the main
chamber of the tank where the
lighter solids settle out
11/20/2014 4

6. EPT Pilot • Screen box is lowered into low
BOD, low solids supernatant after
the settling period
• Wastewater flows through the
screen and down a central effluent
hose
• 50 micron stainless steel screen
• Air scour to deflect any floating
material from coming in contact
with screen
11/20/2014 5

7. Ithaca Influent
Wastewater
Ithaca NY Results ClearCove’s
EPT Effluent
The Best Biomass gets destroyed!
Suspended “Fuel”
6
ClearCove Results
Ithaca Primary Effluent
11/20/2014

8. Sludge
Classifying
Press
• Sludge from the EPT
unit is processed
through SCP
• SCP “cleans” sludge,
removing inorganic
solids and releasing
encased organics.
11/20/2104 7

9. Pilot
Digesters
• 4 Fixed Volume Reactors
– 300-gallon, cone bottom
– 100-gallon operating volume
• Hydraulic Mixing
• Heating using IAWWTF hot water
• Data logging for biogas flow and
digester temperature
• Biogas measurements taken every
10 seconds (over 1 million readings
over the course of the project)
11/20/2104 8

10. Pilot
Digesters
• Four (4) Feed Tanks
• Hydraulic Mixing
• Solenoid valve diversion
to digester
• Feedstock transfer by
buckets
11/20/2104 9

11. BMP
• Bioprocess Control
– Automatic Methane
Potential Test System
(AMPTS II)
• (15) 640 ml reactors
including controls
• Used to validate and
correlate the digester pilot
data
11/20/2104 10

12. Results
• CCS EPT Pilot
• Anaerobic
Digestion Pilots
• Biochemical
Methane
Potential Testing
11/20/2014 11

13. 11/20/2104 12
EPT/SCP Pilot Flow
Schematic

14. 11/20/2104 13

15. Mini-Digester Flow Schematic
Two test units and two control units
11/20/2104 14

16. 10/2/2014 15

17. 10/2/2014 16

18. Plant Impacts
• CCS EPT Pilot
• Anaerobic
Digestion Pilots
• Biochemical
Methane
Potential Testing
11/20/2014 17

19. 11/20/2104 18

20. 11/20/2104 19
Actiflo
BACKWASH

21. Chemical
Impact
• Current use
– 400-500 GPD Ferric Chloride
• Actiflo process
• 700 GPD peak
– 50-100 GPD Ferrous Sulfate
• Headworks
• Estimated use with EPT
– 400 GPD Ferric Chloride
11/20/2104 20

22. Reduction in
Aeration Electricity
 IAWWTF uses 9,400 kWh/day
 Aeration accounts for 48% (submetering)
 72% for BOD removal (O2 demand)
 28% for nitrification (O2 demand)
 BOD removal in existing aeration
 5,960 lb/day, 3,275 kWh/day
 Energy = 0.55 kWh/lbrem
 BOD removal with EPT
 2,290 lb/day, 0.55 kWh/lbrem
 Energy = 1,260 kWh/day
11/20/2104 21
-62%

23. 11/20/2104 22

24. Volatile Solids
Current
• Mass Balance
• Thousand Lb/day
• Gravity Primary Clarifiers
• 28% VS capture
• Gravity Thickener
• 43% VS capture
• Thickened Solids
• 67% primary
• 33% secondary
11/20/2104 23
7.3
18.8
26.1 6.1
9.5
17.0 30.0
13.0
19.5
60,000 scfd

25. Volatile Solids
EPT
• Mass Balance
• Thousand Lb/day
• Enhanced Primary Clarifiers
• 84% VS capture
• Gravity Thickener
• 43% VS capture
• Thickened Solids
• 82% primary
• 18% secondary
11/20/2104 24
7.3
18.9
26.2 1.5
5.0
17.0 30.8
13.6
24.7
100,000 scfd
EPT

26. 11/20/2104 25
-45%
26%
2.4x

27. Energy Production Potential
11/20/2104 26
2.4
times
4.1
times

28. EPT
Demonstration
Summary
• Sufficient amount of data collected
• Pilot EPT: 84% TSS removal
67% BOD5 removal
76% TP removal
• Primary sludge fraction of digester feed
– 67% current
– 82% with EPT
11/20/2104 27

29. Digestion
Demonstration
Summary
• BMP Results
– IAWWTF Primary Sludge
• 4.4 scf methane per lb VS fed
– Enhanced Primary Sludge
• 6.6 scf methane per lb VS fed
– Statistically different with 95%
probability
11/20/2104 28

30. Digestion
Demonstration
Summary
• Pilot Results
– IAWWTF Primary Sludge
• 4.1 scf methane per lb VS fed
• 13.4 scf methane per lb VS destroyed
– Enhanced Primary Sludge
• 8.3 scf methane per lb VS fed
• 28.4 scf methane per lb VS destroyed
– Statistically different with 95%
probability
11/20/2104 29

31. IAWWTF
Impacts
Summary
• Secondary Treatment Costs
– Decrease by 62%
– Savings of approx. $125,000/year
• Methane Generation from Primary Sludge
– Increase by 2.4x
• $325,000/year in kWh value
– Optimized upside potential is 4.5x
• $625,000/year in kWh value
* CNG economic $ value would be ~2x
– Potential for greater amount
• Improved thickening
11/20/2104 30

32. Thank you!
11/20/2104 31

33. Alex Wright, awright@clearcovesystems.com, (585) 269-8176
Rethink. Reduce. Renew.
Mark Greene, mark.greene@obg.com, (315) 956-6271