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

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IAWEA Annual Conference

Accidental Struvite Formation Also Occurs in Dewatering Equipment

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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

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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

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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

THANK YOU

MIKE DITTON

mditton@ostara.com

ostara.com

crystalgreen.com