Post on 08-Sep-2020
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%