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OSTARA Managing BNR’s sludge dewatering challenges through PEARL® nutrient recovery and WASSTRIP®
IAWEA Annual Conference, June 9, 2016
Mike Ditton, Nutrient Recovery Solutions
Ostara
IAWEA Annual Conference
Struvite Happens
Ostara
IAWEA Annual Conference
Make the Best of It
Ostara turns struvite into a high
quality product in the form of
crystalized struvite
Ostara
IAWEA Annual Conference
Slow-Release, Root-Activated™ Fertilizer
Phosphate fertilizer
Plant-activated (Citrate Soluble)
90, 150, 300, 450 SGN prill size
Crystalline, granular dust-free
Lowest Salt Index of any P source
99.6% Purity
Ostara
IAWEA Annual Conference
Operating Experience
2005
Year Ostara was founded.
40
Number of employees including R&D, Ops, Sales, Corp
Pearl® systems 14 Plants worldwide
Global Presence CAN, US, EU
Ostara
IAWEA Annual Conference
Today’s Agenda Important Questions About Nutrient Recovery
1. Existing side stream concerns
2. Where does WASSTRIP fit?
3. What is WASSTRIP and how does it work?
4. What are the realized benefits of WASSTRIP?
5. What continued research is underway?
Ostara
IAWEA Annual Conference
Biological Nutrient Removal Efficiently and Effectively Reduces Effluent Phosphorus Concentration
PRIMARY ANAEROBIC/AEROBIC CLARIFIERS
THICKENING
ANAEROBIC DIGESTER
BIOSOLIDS
Ostara
IAWEA Annual Conference
Aerobic Anaerobic
PHB - Polyhydroxybutyrate
Biological Phosphorus Removal Leverages Polyphosphate Accumulating Organisms (PAOs)
Ostara
IAWEA Annual Conference
Biological Nutrient Removal Combined with Anaerobic Digestion Creates Treatment Challenges
PRIMARY ANAEROBIC/AEROBIC CLARIFIERS
THICKENING
ANAEROBIC DIGESTER
BIOSOLIDS
CENTRATE
(High PO4 and
NH4)
WAS
(High P, N,
Mg, K)
Ostara
IAWEA Annual Conference
Mg2+ + NH4+ + PO4
3- MgNH4PO4∙6H2O
Accidental Struvite Formation Poses Serious Operational Challenges
Ostara
IAWEA Annual Conference
Phosphorus Recovery Intercepts Recycle to Recover Phosphorus and Ammonia
PRIMARY ANAEROBIC/AEROBIC CLARIFIERS
THICKENING
ANAEROBIC DIGESTER
BIOSOLIDS
Ostara
IAWEA Annual Conference
Accidental Struvite Formation Also Occurs in Anaerobic Digesters
Ostara
IAWEA Annual Conference
Accidental Struvite Formation Also Occurs in Dewatering Equipment
Ostara
IAWEA Annual Conference
Aerobic Anaerobic
WASSTRIP Leverages Polyphosphate Accumulating Organisms (PAOs) in Reverse
Ostara
IAWEA Annual Conference
WASSTRIP Increases Phosphorus Recovery While Protecting Digesters from Struvite Formation
PRIMARY ANAEROBIC/AEROBIC CLARIFIERS
THICKENING
ANAEROBIC DIGESTER
BIOSOLIDS
High PO4 and Mg, low NH3
Ostara
IAWEA Annual Conference
Courtesy of Clean Water Services, Durham AWWTP, Tigard, OR
WASSTRIP Reduces Digester Struvite Formation by 90-Percent
Ostara
IAWEA Annual Conference
17
18
19
20
21
22
23
24
25
1/2/2011 4/12/2011 7/21/2011 10/29/2011 2/6/2012 5/16/2012
EBPR Startup
Cake Solids
(%)
Copyright: HDR Engineering and Denver Metro Wastewater Reclamation District
Biological Phosphorus Removal Reduces Biosolids Dewaterability Denver Metro Robert Hite Treatment Facility Full Scale EBNR Trial
Ostara
IAWEA Annual Conference
Examination of three theories of cation-induced bio-flocculation
Sobeck and Higgins (2002)
Monovalent
Cations Divalent Cations
Excess Monovalent Cations Reduce Bridging Effect Impairing Biosolids Dewaterability
Ostara
IAWEA Annual Conference
PHB - Polyhydroxybutyrate
• Released Mg is bound as struvite
• Released K remains free
increase the M/D ratio
Anaerobic Digestion of PAOs Increases the Monovalent to Divalent Cation Ratio in the Digester
Ostara
IAWEA Annual Conference
18
19
20
21
22
23
24
25
26
27
28C
ake
So
lids
(% T
S)
Courtesy of Gwinnett County / Hazen and Sawyer
Start of
WASSTRIP
Gwinnett County F. Wayne Hill Economics at Current Flows
Ostara
IAWEA Annual Conference
HRSD Atlantic Treatment Facility, Virginia Beach, VA
10
15
20
25
30
35
40
45
12/23/2011 4/1/2012 7/10/2012 10/18/2012 1/26/2013 5/6/2013 8/14/2013
Po
lym
er
De
man
d (l
bs/
ton
)
Start of
WASSTRIP
(Courtesy of Hampton Roads Sanitation District, Norfolk, VA)
Implementing WASSTRIP Reduced Polymer Demand by 25%
Ostara
IAWEA Annual Conference
Courtesy of Clean Water Services, Tigard, OR
9
10
11
12
13
14
15
2007 2008 2009 2010 2011 2012 2013 2014 2015*
dry
to
ns/d
ay
dry tons/day
* Jan-June 2015 average
CWS Biosolids Reduction
WASSTRIP
Stabilized
CWS Durham AWWTP Dry Solids Production Has Decreased with Pearl and WASSTRIP
Pearl Start up
Ostara
IAWEA Annual Conference
WASSTRIP & PEARL Provides Many Benefits
Increased fertilizer production
Reduced nuisance struvite formation (90%)
Improved sludge dewaterability (2-3%)
Reduced biosolids production (20%)
Reduced Ammonia Load on plant
Ostara
IAWEA Annual Conference
$
0
CO2 credits
MgCI2 addition
NaOH addition
Power
Labor
Maintenance
Installed
cost
Operating
costs
Savings
Business Case for PEARL & Crystal Green
Ostara
IAWEA Annual Conference
Future Work
• Data collection from multiple WASSTRIP® sites:
– Durham, OR
– Madison, WI
– Saskatoon, SK
– Rock Creek, OR
– Gwinnett County, GA
– Amersfoort, Netherlands
– Chicago, IL
• Pilot digester trials ongoing at HRSD and MCES
• WERF initiative to investigate poor EBPR dewaterability
Ostara
IAWEA Annual Conference
Pearl® Nutrient Recovery has a Growing Installation Base
