Harry Mathos/City of Beloit Bill Marten/Donohue

220 Milligrams /Liter

Under Resourced

Under Funded

Under Valued

1986 Facility Planning

1986 Facility Planning

1986 Effluent BOD5

1986 Effluent TSS

1992 Stateline Road WWTP

ABB PIC

PE

RAS

To

Secondary

Clarifiers

ML Recycle

Beloit’s Anoxic Selectors MLE Process

0

40

80

120

160

200

240

08/07/92 10/02/92 11/27/92 01/24/93 03/21/93 05/16/93 07/11/93

SV

I (m

L/g

)

Aerobic SRT 11 - 13 6 - 9 10 - 13 10

1.0 - 1.2 0.7 - 1.0 0.8 - 1.2Selector F:M

Initial Selector Performance

Low F:M Filaments Abound

Response: RAS Chlorination

Rapid Recovery

Friday Lesson!

SRT Control via Wasting Calculator

1993 Stress Testing Confirms Results, Beloit Experience Contributes to Industry Selector Design Paradigm Shift

PE

RAS

To

Secondary

Clarifiers

ML Recycle

Beloit’s Anoxic Selectors Go Anaerobic, Bio-P From the Get Go • Great For NR 217 Phase 1

Compliance

Struvite (MgNH4PO4) Shows Up in Filtrate System

Bio-P & Anaerobic Digestion: Early Struvite Experiences

…Yes Sir…Struvite!!!

Also Helps Control Sidestream P Loads

Ferric Addition

Struvite Mitigation

It’s Been a Rewarding 25 Year Journey…

…With Its Share of Fun!

0

5

10

15

20

25

30

35

40

Jan91

Jul91

Jan92

Jul92

Jan93

Jul93

Jan94

Jul94

Jan02

Jul02

Jan03

Jul03

Jan04

Jul04

Jan05

Jul05

Jan06

Jul06

Jan07

Jul07

Jan08

Jul08

Jan09

Jul09

Jan10

Jul10

Jan11

Jul11

Jan12

Jul12

Jan13

Jul13

Jan14

Jul14

Jan15

Jul15

Jan16

Jul16

Effl

ue

nt

CB

OD

5 C

on

cen

trat

ion

(m

g/L

)

City of Beloit Effluent CBOD Compliance 1991-94/2002-2016

0

5

10

15

20

25

30

35

40

Jan91

Jul91

Jan92

Jul92

Jan93

Jul93

Jan94

Jul94

Jan02

Jul02

Jan03

Jul03

Jan04

Jul04

Jan05

Jul05

Jan06

Jul06

Jan07

Jul07

Jan08

Jul08

Jan09

Jul09

Jan10

Jul10

Jan11

Jul11

Jan12

Jul12

Jan13

Jul13

Jan14

Jul14

Jan15

Jul15

Jan16

Jul16

Effl

ue

nt

TSS

Co

nce

ntr

atio

n (

mg

/L)

City of Beloit Effluent TSS Compliance 1991-94/2002-2016

0

5

10

15

20

25

30

35

401

/2/2

01

3

3/2

/20

13

5/2/

201

3

7/2/

201

3

9/2

/20

13

11

/2/2

01

3

1/2/

201

4

3/2/

201

4

5/2/

201

4

7/2

/20

14

9/2/

201

4

11

/2/2

01

4

1/2

/20

15

3/2

/20

15

5/2/

201

5

7/2/

201

5

9/2

/20

15

11

/2/2

01

5

1/2/

201

6

3/2/

201

6

5/2

/20

16

7/2

/20

16

9/2/

201

6

11

/2/2

01

6

Bottom Line…Results • Effluent Quality • Community Service & Return on Invested Trust • Capacity for the Future

• Original 8 MGD/25,000 ppd BOD • Mid 90s Rerate 11.3 MGD/37,000 ppd BOD

2013-2016 Effluent BOD5

99.0277777778%