Transcript Status of WWTF Nitrogen Reduction Efforts October 2007

Status of WWTF Nitrogen
Reduction
October 2007
Angelo Liberti
Chief of Surface Water Protection
RIDEM
222-4700 Ext 7225
[email protected]
RIDEM Efforts to Reduce WWTF
Nitrogen Levels
• 1998-2004 WWTFs required to reduce ammonia
encouraged to reduce TN
• XXXX increased WWTF flow to an impaired water
• 2005 Permit modifications issued to remaining WWTFs
impacting the Providence and Seekonk Rivers
• 2006 EPA agreed to develop plan to require TN limits for 5
MA WWTF
Status of RI WWTFs
• 9 Completed construction (2 issued permits
that require further TN reduction)
• 2 - Permits and compliance schedules
issued
• 1 - Permit anticipated
WWTF
Total Nitrogen Limit
Status
1
BURRILLVILLE
Max extent
In compliance.
Ave
7.0
2
CRANSTON
8 mg/l
1/26/06
7.0
5.4
9.8
3
EAST
GREENWICH
5 mg/l
3/06
4.1
3.3
5.2
4
EAST
PROVIDENCE
8 mg/l
5
NBC - BUCKLIN
Design target 8 mg/l
annual ave.
Consent Agreement
FP due 12/31/07
Construction 4/1/12
12/05
7.3
6.3
8.7
Limit 5 mg/l (MayOct)
Effluent Data
May – Oct 05 - 07
Min
Max
6.0
8.0
6
NBC - FIELDS
5 mg/l
7
SMITHFIELD
10 mg/l)
Consent Agreement
Compliance Report
11/30/07.
Consent Agreement Design Due 11/08
6/06
8
9
WARREN
WARWICK
Limits Anticipated
8 mg/l
11/1/04
8.0
6.5
9.2
10
WEST WARWICK
8 mg/l
7/05
8.7
5.3
13.5
11
WESTERLY
15 mg/l
10/03
5.3
3.9
7.4
12
WOONSOCKET
10 mg/l
9/01
7.9 (7.4)
5.7 (5.7)
10.4 (9.3)
5 mg/l
Tentative Agreement
WWTF
Total Nitrogen Limit
Status
1
BURRILLVILLE
Max extent
In compliance.
Ave
7.0
2
CRANSTON
8 mg/l
1/26/06
7.0
5.4
9.8
3
EAST
GREENWICH
5 mg/l
3/06
4.1
3.3
5.2
4
EAST
PROVIDENCE
8 mg/l
5
NBC - BUCKLIN
Design target 8 mg/l
annual ave.
Consent Agreement
FP due 12/31/07
Construction 4/1/12
12/05
7.3
6.3
8.7
Limit 5 mg/l (MayOct)
6
NBC - FIELDS
5 mg/l
Consent Agreement
Compliance Report
11/30/07.
Consent Agreement Design Due 11/08
Effluent Data
May – Oct 05 - 07
Min
Max
6.0
8.0
WWTF
Total Nitrogen Limit
Status
Effluent
Data
May – Oct
05 - 07
Ave
Min
Max
7
SMITHFIELD
Nitrogen (max extent)
6/06
8
9
WARREN
WARWICK
Limits Anticipated
8 mg/l
11/1/04
8.0
6.5
9.2
10
WEST WARWICK
8 mg/l
7/05
8.7
5.3
13.5
11
WESTERLY
Design target 12 mg/l
10/03
5.3
3.9
7.4
12
WOONSOCKET
10 mg/l
9/01
7.9 (7.4)
5.7 (5.7)
10.4 (9.3)
5 mg/l
Tentative Agreement
Goal of Reducing RI WWTF TN
by 50%
• Goal based on 95-96 levels from 11
WWTFs impacting the Upper Bay
• Required reductions - 65% dropping to 48%
as WWTF flows increase to approved
design flows.
• Current reduction approximately 35%
Status of MA WWTF
• 3 Permits drafted, comment period ended
– Upper Blackstone Water Pollution Abatement
District (5 mg/l)
» Attleboro (8 mg/l)
– North Attleborough (8 mg/l)
• 2 Remaining
– Grafton
– Uxbridge