1055. reducing phosphorus discharges from neorsd wwtps. esping€¦ · brown and caldwell /neorsd...

Reducing Phosphorus Discharges from the NEORSD WWTPs

August 27, 2014

Greg Binder, P.E.Elizabeth Toot-LevyNortheast Ohio Regional Sewer District

Don Esping, P.E.Jeff Ifft , P.E.Brown and Caldwell

Agenda

Brown and Caldwell /NEORSD 2

• Phase 1 Evaluation Screening• Potential Future Phosphorus Limits• Phosphorus Reduction Alternatives

• Phase 2 Evaluation• Easterly, Westerly, Southerly Alternatives• Averaging Period Impacts

• Conclusions

• Who we are…• Regional wastewater utility created in 1972 by court order• Separate and distinct from the City of Cleveland and

Cuyahoga County

• What we do…• Servicing all or part of 62 member communities• 1 million customers• 90+ billion gallons wastewater treated each year

Northeast Ohio Regional Sewer District

Brown and Caldwell/NEORSD

Westerly WWTCEasterly WWTP Southerly WWTC

Northeast Ohio Regional Sewer District

4Brown and Caldwell/NEORSD

355square miles

Easterly and Westerly: Basis for TP Limit Scenarios

Brown and Caldwell /NEORSD

5

Easterly: 80/400 mgdWesterly: 30/100 mgd

• Lake Erie Discharges• Current Monthly TP Limit = 1.0 mg/L• Potential Monthly TP limit = range of 0.3 to 0.7 mg/L

Southerly: Basis for TP Limit Scenarios

Brown and Caldwell /NEORSD 6

Southerly: 120/615 mgd

• Cuyahoga River Discharge• Current Monthly TP Limit = 0.7 mg/L• Potential Monthly TP limit = as low as 0.3 mg /L

• Continued Ferric vs Bio-P

• Tertiary Processes

Phase 1 – Alternative Screening

Brown and Caldwell/NEORSD 7

DAFTBallasted FlocFilters

Phase 1 Screening

Brown and Caldwell /NEORSD 8

• Evaluate Options based upon a monthly TP limit• Chemical P Removal

Potential Effluent TP Limit(mg /L)

Easterly Westerly Southerly

EffluentFiltration

Ballasted Floc

EffluentFiltration

Ballasted Floc

EffluentFiltration

Ballasted Floc

TertiaryClarification /

Filtration

Ballasted Floc /

Filtration

0.50 √ √ √ √ √ √

0.30 √ √ √ √ √ √

0.15 √ √

• Facility sizing• Solids impact• Planning level costs

Basis of Evaluation

Brown and Caldwell /NEORSD 9

General Flow Scheme

Tertiary TreatmentFerric Chloride

Caustic

FinalEffluent

Secondary Effluent

Monthly Effluent TP Limit Target Effluent TP

0.5 mg/L ≈ 0.40 mg/L

0.3 mg/L ≈ 0.24 mg/L

0.15 mg/L ≈ 0.12 mg/L

Tertiary ProcessMax Month Effluent TP

Filtration 0.24 mg/L

Ballasted Flocculation 0.2 mg/L

Tertiary Clarifiers/Ballasted Flocculation with Filtration (Southerly)

0.1 mg/L

Easterly WWTP

0

0.5

1

1.5

2

2.5

3

3.5

4

4.501

‐Jan

‐10

01‐M

ar‐10

01‐M

ay‐10

01‐Jul‐10

01‐Sep

‐10

01‐Nov

‐10

01‐Jan

‐11

01‐M

ar‐11

01‐M

ay‐11

01‐Jul‐11

01‐Sep

‐11

01‐Nov

‐11

01‐Jan

‐12

01‐M

ar‐12

01‐M

ay‐12

01‐Jul‐12

01‐Sep

‐12

01‐Nov

‐12

01‐Jan

‐13

01‐M

ar‐13

Total Pho

spho

rus, m

g/L

Influent Effluent

Easterly: Historical Influent and Effluent P

Average Influent = 2.0 mg/L= 1415 lb P/d

Easterly – Tertiary Treatment Facility and Impacts

Brown and Caldwell /NEORSD 12

Scenario Tertiary Capacity

mgdAdditional

FeCl3mg/L

Caustic Addition

gal/d

Solids IncreasePercent

Filtration

0.5 mg/L TP 55 5 40 +4

0.3 mg/L TP 200 5 100 +7

Ballasted Flocculation

0.5 mg/L TP 50 30 200 +9

0.3 mg/L TP 110 30 400 +17

“Optimized” Operation as Higher Ferric Dosage

-- 5 100 +4

“Optimized” Operation for Lower TP limit

Brown and Caldwell /NEORSD

Easterly - 0.5 mg/L TP Limit - Filters

Brown and Caldwell /NEORSD 14

To Lake Erie

Dry Weather Flow to Filters

Filters5 or 6 @ 40’x60’

Chemical Storage

and Handling

6 5

4 3

2 1

5 6

3 4

1 2

Pump Station

Additional Chemical Storage

Westerly WWTP

0

0.5

1

1.5

2

2.5

3

3.5

4

4.5

5

01

-Jan

-10

01

-Feb

-10

01

-Mar

-10

01

-Apr

-10

01

-May

-10

01

-Jun

-10

01

-Jul

-10

01

-Aug

-10

01

-Sep

-10

01

-Oct

-10

01

-Nov

-10

01

-Dec

-10

01

-Jan

-11

01

-Feb

-11

01

-Mar

-11

01

-Apr

-11

01

-May

-11

01

-Jun

-11

01

-Jul

-11

01

-Aug

-11

01

-Sep

-11

01

-Oct

-11

01

-Nov

-11

01

-Dec

-11

01

-Jan

-12

01

-Feb

-12

01

-Mar

-12

01

-Apr

-12

01

-May

-12

01

-Jun

-12

01

-Jul

-12

01

-Aug

-12

01

-Sep

-12

01

-Oct

-12

01

-Nov

-12

01

-Dec

-12

01

-Jan

-13

01

-Feb

-13

01

-Mar

-13

Tota

l Pho

spho

rus,

mg/

L

Influent Effluent

Westerly: Historical Influent and Effluent PAverage Influent = 1.9 mg P/L

= 430 lb P/d

Westerly -Tertiary Treatment Facility and Impacts

Brown and Caldwell /NEORSD 17

Scenario TertiaryCapacity

mgd

Additional FeCl3mg/L

Caustic Addition

gal/d

Solids IncreasePercent

Sludge Fe ContentPercent

Existing Ops -- 7 0 -- 1.7

Filtration

0.5 mg/L TP 21 7 5 4 2.8

0.3 mg/L TP 70 7 15 5 3.1

Ballasted Flocculation

0.5 mg/L TP 19 30 30 9 5.3

0.3 mg/L TP 45 30 60 14 6.7

Southerly WWTC

• Historical data not applicable with decommissioning Zimpro and secondary treatment modifications

• Estimate plant performance using BioWin®

Southerly - Approach

Brown and Caldwell /NEORSD 19

Southerly – Predicted Secondary Effluent without Fe

Brown and Caldwell /NEORSD 20

0.0

0.2

0.4

0.6

0.8

1.0

1.2

0 10 20 30 40 50 60

SSAS

 Efflue

nt TP, m

g/L

Model DayPredicted SSAS Effluent‐ Medium Range Predicted Monthly Discharge‐Medium Range

Predicted SSAS Effluent ‐ Upper Range Predicted Monthly Discharge‐Upper Range

Southerly– Filter Concept Footprint

Brown and Caldwell /NEORSD 21

30-day Average TP Permit Limit

(mg/L)

Capacity(mgd)

Number of Filters

0.50 130 13

0.30 250 20

0.15 225 20

28 existing

Normalized Costs for Further TP Reduction

22

$-

$100

$200

$300

$400

$500

$600

An

nu

aliz

ed $

/lb

TP re

mov

ed

Capital O&MFilters Ballasted Floc

Impact of Averaging Period- Filter Options

Brown and Caldwell /NEORSD 23

Plant/Averaging Period

0.5 mg/L TP 0.3 mg/L TPTertiary Capacity

(mgd)Tertiary Capacity

(mgd)Easterly

30 Day Average 55 200

90 Day Average 47 150

180 Day Average 43 140

Westerly

30 Day Average 21 70

90 Day Average 18 45

180 Day Average 15 33

Conclusions

Brown and Caldwell /NEORSD 24

Easterly and Westerly

Southerly• ≈ 65% itinerary average flow to achieve 0.5 mg/L TP• ≈ 90% of itinerary peak week flow treated to achieve 0.3 mg/L TP

Averaging periods can significantly reduce facility needs and costs

Item Filters Ballasted Floc

0.5 mg/L TP ≈ 65% Daily flow ≈ 60% Daily flow

0.3 mg/L TP ≈ 90% Peak week flow ≈ 55% Peak week flow

Solids Production Increase

5%– 10% 10% –20 %

Sludge Iron Content 0.5 – 1.0% pts 4-6 pts

Thank you!Greg Binder

BinderG@neorsd.com

Don Esping, P.E.

DEsping@BrwnCald.com