city of tallahassee wastewater treatment system hydrogeology workshop – 2005 may 12 – 13, 2005
TRANSCRIPT
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City of Tallahassee Wastewater Treatment System
Hydrogeology Workshop – 2005
May 12 – 13, 2005
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Description of System Population Served –
170,000+ Treatment Plants:
LBR – 4.5 mgd TPS – 27.5 mgd Total = 32 mgd Effluent Discharges: SWS – 1.04 mgd SEF – 27.39 mgd Total = 28.43 mgd
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Southeast Farm
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City’s Wastewater Treatment System Highly Regulated FAC 62-610 – Reuse, including land
application FAC 62-600 – Wastewater Treatment
Facilities FAC 62-601 – Wastewater Monitoring 503 Rule – Federal Biosolids regulationsMyriad others regarding safety, chemicals,
stormwater, etc.
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Chapter 62-610, F.A.C. Created in 1989 Earlier Rules From 1980 Revised in 1999 Comprehensive Detailed Consistent With National Guidelines
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Ground Water Standards Potable Ground Water Drinking Water Standards
Primary Standards Secondary Standards
Total Coliforms < 4/100 mL Nitrate - 10 mg/L (as N)
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Other Controls Monitoring
Reclaimed Water Ground Water
Operator Staffing Access Controls Storage
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Monitoring Wells
Ground Water Flow
100 ft.Land Application
Zone of Discharge
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SEF Monitoring Wells
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Total Nitrogen from TPS, Lbs.Total Lbs N/Month from TPS, 1995-2003
0
10000
20000
30000
40000
50000
60000
70000
80000
Jan-95
Apr-95
Jul-95
Oct-95
Jan-96
Apr-96
Jul-96
Oct-96
Jan-97
Apr-97
Jul-97
Oct-97
Jan-98
Apr-98
Jul-98
Oct-98
Jan-99
Apr-99
Jul-99
Oct-99
Jan-00
Apr-00
Jul-00
Oct-00
Jan-01
Apr-01
Jul-01
Oct-01
Jan-02
Apr-02
Jul-02
Oct-02
Jan-03
Apr-03
Jul-03
Oct-03
N L
bs
.
LBS
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Nutrient Uptake Rates for Selected Crops
0
100
200
300
400
500
600
NITROGEN PHOSPHOROUS POTASSIUM
PO
UN
DS/
AC
RE
Alfalfa Coastal Bermuda RyegrassSweet Clover Corn Grain SorghumSoybeans Cotton
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Estimated N Allowable at SEF Total acres in pivots = 2000 80% in bermuda grass @ 400 lbs. N 10% in corn @ 210 lbs. N 10% in other crops @ 150 lbs. N Total N allowed per year = 712,000 lbs. Or 1950 lbs/day average
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SE Farm Pond EffluentNitrate + Nitrite 1983-2002
0.00
5.00
10.00
15.00
20.00
25.00
30.00
35.00
1/13/1983
10/7/1985
3/25/1987
8/21/1988
2/19/1990
7/31/1991
1/6/1993
6/27/1994
12/11/1995
9/24/1997
3/10/1999
8/23/2000
Date Collected
mg
/l a
s N
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Successes in Reducing Nitrogen Loads Stopped applying biosolids in Wakulla
County 2001 Start-up of Class A dryer March 2004 85% reduction of total biosolids land
applied at airport 85% Class A product or Class B to landfill Obtaining more N reduction at TPS
effluent
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City Actions in Finding Solutions USGS Study - $495 K over three years Treatment Master Plan – Review treatment
and disposal options for long-term sustainability
Planning additional biosolids treatment to produce 100% Class A Biosolids for reuse
Nutrient Management Plan for near-term Farm Operations
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Economic Impacts $66 million proposed to upgrade TPS Additional $millions for full nutrient
removal (2 ppm nitrates) Could lead to large rate increase Does not include O&M costs
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Water Utility Approach1. Collect Data
2. Develop Alternatives through Master Plan
3. Prepare Plan of Action for Improvements
4. Obtain Funding & Implement Near-term Items
5. Participate in TMDL process to fine-tune Plan of Action and priorities
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TMDL Schedule for Wakulla River
2007 - Begin developing TMDL 2008 - Adopt TMDL by rule (APA) 2009 - Establish TMDL implementation
plan 2010 – Implementation