2020 Annual Biosolids

WorkshopTuesday February 4 , 2020

Overview Biosolids Program

Pima County Regional Water Reclamation

P I M A C O U N T Y

Our Vision

To be an industry leader in the management and sustainability

of the water reclamation cycle and other renewable resources.

Our Mission

To protect the public health, safety, and the environment by providing quality service, environmental stewardship, and renewable resources.

Houssam B. Eljerdi

Chemical Engineer, M.S., P.E.

Energy Engineer, B.S.

Technical Services Manager, Pima County, Arizona

ADEQ Water and Wastewater Operator Certification

Houssam has worked in the field of water, wastewater and energy for 25 years

Overview Biosolids Program & Tres Rios WRF Pima

County Regional Water Reclamation

P I M A C O U N T Y B I O S O L I D S P R O G R A M

S l u d g e D i s p o s a l

C h a l l e n g e sM a s te r p l a n n i n g

Re s o u rc e O p t i m i za t i o n

P I M A C O U N T Y B I O S O L I D S P R O G R A M

P i m a C o u n t y W R F s

B i o s o l i d s Q u a l i t y a n d U t i l i z a t i o n

U p d a t e B i o s o l i d s M a s t e r P l a n

T r e s R i o s W R F E n e r g y E v a l u a t i o n

U p g r a d e f r o m B i o g a s t o R N G

P F A S a t W R F s

W E F B i o s o l i d s C o n v e n i n g

Sol ids Management Centra l i zed at Tres R ios WRF

1 Agua Nueva WRF

2 Tres Rios WRF

3 Green Valley WRF

4 Fairground WRF

5 Avra Valley WRF

6 Corona de Tucson WRF

7 Arivaca WRF

8 Randolph Park WRF (Standby)

9 Mt. Lemmon WRF

Sol ids Process ing Centra l i zed at Tres R ios WRF

VOLATILE SOLIDS REDUCTION

38(%)

R18-9-1010-A.1

40 CFR 503.33(b)(1)

Biosol idsClass B

R18-9-1006-E Alternative 5

40 CFR 503.32(b)(3)

Sol ids Process ing Centra l i zed at Tres R ios WRF

B A R D E N P H O , T R E S R I O S W R F

Apr i l 2013

W e s t P l a n t

25 MGD

Bardenpho

October 2013

East P lant

25 MGD

BNRAS to Bardenpho

Sol ids Process ing Centra l i zed at Tres R ios WRF

Biosol ids Disposal and Ut i l i zat ion

Pre-1983

Landfill

1983 – 2019 Land

Application

2020

Landfill

2021

Resource Management Master Plan

P I M A C O U N T Y W R F s

Capacity, Annual Flow, Biogas and Sludge Production

Pima County Regional Water Reclamation Department

Pima County, Arizona

Capacity, MGD 94.4

Daily Influent, MGD 59.3

Annual Biogas, MM scf 311

Annual Digested Sludge to Centrifuge, MGY 116

A N N U A L B I O S O L I D S P R O D U C T I O N

2 0 1 6 - 2 0 1 9

B I O S O L I D S D E WAT E R I N G

2 0 1 6 - 2 0 1 9

A N N U A L W R F S I N F L U E N T

2 0 0 7 - 2 0 1 8

B I O G A S , M O N T H LY P R O D U C T I O N

23

21

17

2120

1919

19

181719

2223

21

25

2223

2020

2019

192020

2523

25

2223

19

151717

2022

2528

2628

2525

2219

2120

2326

3133

30

J-15 M-15M-15 J-15 S-15 N-15 J-16 M-16M-16 J-16 S-16 N-16 J-17 M-17M-17 J-17 S-17 N-17 J-18 M-18M-18 J-18 S-18 N-18 J-19

MIL

LIO

NS

CU

BIC

FE

ET

PE

R M

ON

TH

Biogas Production, Anaerobic Digesters; 2015 - 2019Tres Rios WRF, Pima County RWRD

B I O S O L I D S D R Y T O N S , A N N U A L

T R E S R I O S W R F , 2 0 0 1 - 2 0 1 9

U P D AT E B I O S O L I D S & B I O G A S M A S T E R P L A N

• Land Availability

• Regulatory Pressures

• Value of Biogas

• Maturing Technologies

• State of the Process at Tres Rios WRF

• A l t e r n a t i ve 1 – T E P S u p p l y p l u s E R F

• A l t e r n a t i ve 2 – T E P S u p p l y p l u s C e n t ra l P l a n t

• N e t P re s e n t Wo r t h A l t e r n a t i ve 1 a n d A l t e r n a t i ve 2

• Q u a l i t a t i ve C o m p a r i s o n o f t h e Tw o A l t e r n a t i ve s

• T E P S u p p l y p l u s C e n t ra l P l a n t Re c o m m e n d e d

• L o w e r N P V L i fe c yc l e - b a s e d

• Re d u n d a nt E l e c t r i c Po we r S o u rc e

• O p p o r t u n i t y fo r G re a t e r B e n e f i c i a l U s e o f B i o ga s

• L o n g - t e r m O p e ra t i o n a l F i t a n d S e c u r i t y

2010 ENERGY MASTER PLAN, TRES R IOS WRF

F L A R I N G B I O G A S , T R E S R I O S W R F

• 1 7 A l t e r n a t i ve s I n i t i a l

• T h re e A l t e r n a t i ve s Eva l u a t e d w i t h Va r i a t i o n s

• BIOMETHANE FOR PREMIUM MARKET, VEHICLE FUEL AND PLANT HEATING

• H i g h L i fe c yc l e N P V

• A i r Pe r m i t t i n g L e s s D i f f i c u l t t h a n fo r C o ge n e ra t i o n

• C o m p a t i b i l i t y W i t h A l t e r n a t i ve D e l i ve r y, O p e ra t i o n a n d F i n a n c e

• A c c o m m o d a t e va r i a t i o n s i n ga s f l o w w i t h o u t f l a r i n g

• L o w n o n - C O 2 e m i s s i o n s , N O x a n d C O.

• Po t e n t i a l t o re c o ve r C O 2 i n t h e f u t u re

2012 REGIONAL BIOGAS MASTER PLAN, PIMA COUNTY

PRODUCTION , UTILIZATION AND FLARING B IOGAS

B I O G A S , 2 0 1 0 V S . 2 0 1 9

• D ete r mi n e Fa c i l i t y L oa d s

• C on s i d e r e me rg i n g p owe r te c h n o l og i e s

• Eva l u ate t h e c ros s con n e c t i on b et we e n t h e s o l i d s , t h e B i oga s

a n d t h e p owe r re q u i re me nts

• A i d i n C I P

• Eva l u ate re s i l i e n c e a n d re l i a b i l i t y

• A s s e ss ex i s t i n g i n f ra st r u c t ure a n d re comme n d n e e d e d

u p gra d es

2020 ENERGY EVALUATION , TRES R IOS WRF

B I O G A S T O R N G

• Reduce GHG Emissions

• Support Sustainability

• Optimize Resources

B IOGAS TRANSFER P IPELINE, JANUARY 2018

SWG Stubout to Fence Line

167 feet

Digesters to Biogas Plant

3,400 feet

Tres Rios WRF, Pima County

SWG P IPELINE FROM T IE- IN TO FENCE

O PERATING PARAMETERS , A NAEROBIC D IGESTION

B I O G A S C O M P O S I T I O N , T R E S R I O S W R F

300

400

500

600

700

800

900

Bio gas Samp l ing An a lys i s Re su l ts , Tre s R io s WRFJ u n e 2018

BTU/SCF(dry) Hydrogen Sulf ide, ppm

B IOGAS UPGRADE SYSTEM TO P IPELINE QUALITY

DigestersSWG

Receiving Station

FUEL PATH FROM CELLULOSIC FEED TO ENERGY

A n a e r o b i c D i g e s t e r s

P u r i f i c a t i o n &

C o m p r e s s i o n

Natural Gas Pipeline(Local or Interstate

Transporter)

Thickened Sludge Feed

BiogasRenewable

Natural Gas

End User

P F O S & P F O A

PFOS & PFOA, ng/LInfluent Effluent

17.5 17.8 Agua Nueva WRF10.6 14 Tres Rios WRF

PFOS & PFOA Daily Mass Loading and DischargeInflent Effluent

Gram Gram

Agua Nueva WRFPFOS & PFOA 1.7 1.7

Tres Rios WRFPFOS & PFOA 1.0 1.3

P F O S & P F O A

PFAS Loading per Acre Land Applied Biosolids, mg-PFAS/Acres-Year

Concentration PFAS in Biosolids, Dry weight result from lab 0.0329 mg/kg

Annual Biosolids Production 13,000 Dry Tons/Year

Annual Biosolids Production 11,804 Kg/Year

Annual PFAS Loading in Land Application Fields 388 mg/Year

Total Acres Land Applied per Year 2,960 acres/Year

Grams PFAS per Acre, Annual 0.131 mg/Acre

S T U D Y , P F A S

O C C U R R E N C E , A C C U M U L A T I O N A N D D E G R A D A T I O N

• WET/WEST Center PFAS

• Data Integrity

• Biosolids Samples

• Farmlands receiving land application of Biosolids, 5-10 years

• Farmlands continuously receiving Biosolids for 10 -20 years

• Pima County Biosolids, 152 Farm fields, 2001 - 2019

S T U D Y , P F A S

O C C U R R E N C E , A C C U M U L A T I O N A N D D E G R A D A T I O N

Completion Deadline

• SOW Completion January 31, 2020

• Land Parcel & Well Identification February 28, 2020

• Sample Collection March 31, 2020

• Sample Analysis June 30, 2020

• Data Review & Report Generation August 31, 2020

• Final Report Submission September 15, 2020

S T A T E O F T H E B I O S O L I D S , W E F C O N V E N I N G

o G a p s a n d D i s i n v e s t m e n t i n O v e r s i g h t

o Un c erta inty o ver th e R i sk o f CECs in B io sol ids , Fu tu re an d EPA G u idance

o Collaboration & Communication, Public, Academia, Industry, Regulators, Practitioners

o R e s e a r c h N e e d s

o M a r k e t P r e s s u r e s a n d Tr e n d s

o W o r k f o r c e P r e s s u r e s

S T A T E O F T H E B I O S O L I D S , W E F C O N V E N I N G

o D e d i c a t e d A d v o c a t e

o C E C R e s e a r c h P l a n

o C E C C o m m u n i c a t i o n M a t e r i a l s

o E n h a n c i n g B e n e f i t s o f B i o s o l i d s

C o m m u n i c a t i o n s

o B r o a d e r P a r t n e r s h i p s

o P r e p a r e a n d A d v a n c e A n I n n o v a t i o n

o D e f i n i n g a S u s t a i n a b l e P r o g r a m

o S t r a t e g i c P l a n f o r A c t i o n

Your Attendance & Attention Are

Appreciated

P I M A C O U N T Y B I O S O L I D S P R O G R A M , P I M A

C O U N T Y

Statements of fact and opinion expressed are those of the author(s)/presenter(s). AZ Water, AZAWWA, and AZWEA assume no responsibility for the content, nor do they represent

official policy of the Association.