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2012 Annual Meeting of
Evaluating Nutrient Removal at Nine Springs Wastewater Treatment Plant
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Evaluating Nutrient Removal at Nine Springs Wastewater Treatment - - PowerPoint PPT Presentation
Evaluating Nutrient Removal at Nine Springs Wastewater Treatment - - PowerPoint PPT Presentation
Evaluating Nutrient Removal at Nine Springs Wastewater Treatment Plant g A Technology and Cost Evaluation Study Tania Datta, James Fisher, Samuel Jeyanayagam and Glen T. Daigger, CH2M HILL Dave Taylor/Project Manager, Steve Reusser, Paul
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2012 Annual Meeting of
Recent administrative rule revisions and the Rock River total maximum daily load addressing phosphorus Future regulations addressing nitrogen
Madison Metropolitan Sewerage District (MMSD) is anticipating lower nutrient limits because of:
Background
The Nutrient Problem
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2012 Annual Meeting of
China’s Approach:
“Qingdao, site of the Olympic sailing regatta in August 2008, was surrounded by algae. The Chinese have begun a huge cleanup effort” – NY Times, July 1, 2008
Background
The Nutrient Problem
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Background
2012 Annual Meeting of
MMSD’s Approach:
Scenario Total Phosphorus, mg/L Total Nitrogen, mg/L
1 0.225 2 None 1 2 0.130 2 None 1 3 0.075 3 None 1 4 0.225 2 10 2 5 0.130 2 10 2 6 0.075 3 10 2 7 0.225 2 3 2 8 0.130 2 3 2 9 0.075 3 3 2
1 Existing ammonia limits apply
2 Monthly average concentrations 3 Annual average concentrations
Nutrient Discharge Limit Scenarios Analyzed for Treated Effluent
Assess the cost impacts for 9 scenarios of potential low nutrient discharge limits
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Project Objectives
2012 Annual Meeting of
The primary objectives of this study was to:
Develop process alternatives capable of meeting nutrient limits presented in each scenario Screen alternatives based on pros and cons to select the most promising technology Use process modeling to size required tanks and other process equipment as well as estimate chemical and energy usage and other
- perating requirements
Estimate capital, operation and maintenance (O&M), and 20-yr life cycle costs Estimate greenhouse gas emissions from the operations associated with meeting the nutrient limits
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Existing Nine Springs WWTP (NSWWTP)
2012 Annual Meeting of Central States WEA
§ Average Flow Capacity = 57 MGD § Peak Flow Capacity through Disinfection= 110 MGD
WEST PLANT EAST PLANT
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Nine Springs WWTP (NSWWTP) Process Flow Diagram after Ongoing Construction
2012 Annual Meeting of
HEADWORKS BIOSOLIDS TO LAND APPLICATION RAS WAS EFFLUENT DISCHARGE GRAVITY THICKENERS PRIMARY CLARIFIERS ANAEROBIC ANOXIC
M M
AEROBIC ANAEROBIC
M
MODIFIED UCT PROCESS A/O PROCESS SECONDARY CLARIFIERS ULTRAVIOLET DISINFECTION ANAEROBIC DIGESTERS ANAEROBIC RECYCLE PHOSPHORUS RELEASE TANK STRUVITE RECOVERY STRUVITE PELLETS GRAVITY BELT THICKENERS AEROBIC GRAVITY BELT THICKENERS SECONDARY CLARIFIERS RAS
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Developing and Screening Process Alternatives
Nutrient removal alternatives matrix was developed to capture an array of viable approaches, including:
- Biological and chemical phosphorus removal approaches
- Different configurations for biological nitrogen removal
- Tertiary solids, phosphorus, and nitrogen removal technologies
Pros and cons of each technology assessed Preliminary rough capital cost estimates identified to facilitate comparison of alternatives Identified the most promising treatment alternative for each nutrient scenario for subsequent modeling and detailed cost estimating 2012 Annual Meeting of
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Methodology
§ A Steady State, Excel Based, Whole Plant Simulator - CH2M HILL’s PROfessional
PROcess Design or Pro2D
§ Pro2D was interfaced directly with CH2M HILL ‘s Parametric Estimating System (CPES) §This approach enables efficient evaluation of alternatives with associated impacts (that is,
the mass of nutrients removed, changes in biosolids quantity, and changes in chemical usage), life-cycle costs and GHG estimates CH2M HILL Experience Pro2D Mass Balance Biowin GPSx ASM Layout Information CPES Specifications Design Basis QUALITY CONTROL Residuals Process Models Liquids Process Models Biological Process Models
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Modifications to NSWWTP for Scenario 1 and 2 Nutrient Control
HEADWORKS BIOSOLIDS TO LAND APPLICATION WAS EFFLUENT DISCHARGE GRAVITY THICKENERS PRIMARY CLARIFIERS ULTRAVIOLET DISINFECTION ANAEROBIC DIGESTERS PHOSPHORUS RELEASE TANK STRUVITE RECOVERY STRUVITE PELLETS GRAVITY BELT THICKENERS Metal-salt addition DEEP BED GRANULAR MEDIA FILTERS SECONDARY EFFLUENT PUMP STATION GRAVITY BELT THICKENERS RAS ANAEROBIC ANOXIC
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AEROBIC ANAEROBIC
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MODIFIED UCT PROCESS A/O PROCESS SECONDARY CLARIFIERS ANAEROBIC RECYCLE AEROBIC SECONDARY CLARIFIERS RAS
2012 Annual Meeting of
Scenario 1 = TP 0.225 mg/L; Scenario 2 = TP 0.130 mg/L (Monthly Basis)
79 MGD, 300 HP Capacity + Spare 10 active filters, each 5-ft deep and 1,100-sq ft area + Spare Metal salt receiving and feed facility
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Modifications to NSWWTP for Scenario 3 Nutrient Control
Scenario 3: TP limits of 0.075 mg/L on an Annual Average Basis
HEADWORKS BIOSOLIDS TO LAND APPLICATION WAS EFFLUENT DISCHARGE GRAVITY THICKENERS PRIMARY CLARIFIERS ULTRAVIOLET DISINFECTION ANAEROBIC DIGESTERS PHOSPHORUS RELEASE TANK STRUVITE RECOVERY STRUVITE PELLETS GRAVITY BELT THICKENERS Metal-salt addition DEEP BED GRANULAR MEDIA FILTERS SECONDARY EFFLUENT PUMP STATION LAMELLA CLARIFIERS FLOCCULATION BASIN RAPID MIX SYSTEM Polymer RAS ANAEROBIC ANOXIC
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AEROBIC ANAEROBIC
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MODIFIED UCT PROCESS A/O PROCESS SECONDARY CLARIFIERS ANAEROBIC RECYCLE AEROBIC SECONDARY CLARIFIERS RAS Metal Salt GRAVITY BELT THICKENERS
2012 Annual Meeting of
System sized to handle a maximum flow rate of 79 MGD. Total required clarifier area = 19,500 sq-ft. Rapid Mix Tanks = 9,700-sq-ft Flocculation Tanks = 20,800 sq-ft
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Modifications to NSWWTP for Scenario 4 and 5 Nutrient Control
2012 Annual Meeting of
HEADWORKS BIOSOLIDS TO LAND APPLICATION RAS WAS EFFLUENT DISCHARGE GRAVITY THICKENERS PRIMARY CLARIFIERS ANAEROBIC ANOXIC
M M
AEROBIC ANAEROBIC
M
MODIFIED UCT PROCESS SECONDARY CLARIFIERS ULTRAVIOLET DISINFECTION ANAEROBIC DIGESTERS ANAEROBIC RECYCLE PHOSPHORUS RELEASE TANK STRUVITE RECOVERY STRUVITE PELLETS GRAVITY BELT THICKENERS AEROBIC Metal-salt addition DEEP BED GRANULAR MEDIA FILTERS SECONDARY EFFLUENT PUMP STATION NITRATE-RICH MIXED LIQUOR RECIRC
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ANOXIC
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SECONDARY CLARIFIERS RAS GRAVITY BELT THICKENERS §Scenario 4 = TP Limit of 0.225 mg/L and TN Limit of 10.0 mg/L (Monthly Average Basis) §Scenario 5 = TP Limit of 0.130 mg/L and TN Limit of 10.0 mg/L (Monthly Average Basis)
0.84 MG Anoxic Volume + NRCY 7.34 MG Anoxic Volume + NRCY
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Modifications to NSWWTP for Scenario 6 Nutrient Control
HEADWORKS BIOSOLIDS TO LAND APPLICATION WAS EFFLUENT DISCHARGE GRAVITY THICKENERS PRIMARY CLARIFIERS ULTRAVIOLET DISINFECTION ANAEROBIC DIGESTERS PHOSPHORUS RELEASE TANK STRUVITE RECOVERY STRUVITE PELLETS GRAVITY BELT THICKENERS Metal-salt addition DEEP BED GRANULAR MEDIA FILTERS SECONDARY EFFLUENT PUMP STATION LAMELLA CLARIFIERS FLOCCULATION BASIN RAPID MIX SYSTEM Polymer RAS ANAEROBIC ANOXIC
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AEROBIC ANAEROBIC
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MODIFIED UCT PROCESS SECONDARY CLARIFIERS ANAEROBIC RECYCLE AEROBIC NITRATE-RICH MIXED LIQUOR RECIRC
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ANOXIC
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SECONDARY CLARIFIERS RAS Metal Salt GRAVITY BELT THICKENERS
Scenario 6: TP Limit of 0.075 mg/L on an Annual Average Basis and TN Limit of 10.0 mg/L on a Monthly Average Basis
2012 Annual Meeting of
Combination of Scenario 3 and Scenario 4, 5
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Modifications to NSWWTP for Scenario 7 Nutrient Control
Scenario 7: TP Limit of 0.225 mg/L and TN Limit of 3 mg/L on a Monthly Average Basis
2012 Annual Meeting of
Existing Treatment Tank Volume Expanded By ~4MG + Blowers + Secondary Clarifiers + RAS, WAS pumps + NRCY Pumps
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Modifications to NSWWTP for Scenario 8 Nutrient Control
Scenario 8: TP Limit of 0.130 mg/L and TN Limit of 3 mg/L on a Monthly Average Basis
2012 Annual Meeting of
HEADWORKS BIOSOLIDS TO LAND APPLICATION RAS WAS GRAVITY THICKENERS PRIMARY CLARIFIERS ANAEROBIC ANOXIC
M M
AEROBIC 5-STAGE BARDENPHO PROCESS SECONDARY CLARIFIERS ULTRAVIOLET DISINFECTION ANAEROBIC DIGESTERS PHOSPHORUS RELEASE TANK STRUVITE RECOVERY STRUVITE PELLETS GRAVITY BELT THICKENERS Metal-salt addition DEEP BED GRANULAR MEDIA FILTERS SECONDARY EFFLUENT PUMP STATION NITRATE-RICH MIXED LIQUOR RECIRC
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ANOXIC AEROBIC ANAEROBIC ANOXIC
M AEROBIC M M
ANOXIC MBR GRAVITY BELT THICKENERS EFFLUENT DISCHARGE
Designed to treat 9.20 MGD
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Modifications to NSWWTP for Scenario 9 Nutrient Control
Scenario 9: TP Limit of 0.075 mg/L on an Annual Average Basis and TN Limit of 3 mg/L on a Monthly Average Basis
HEADWORKS BIOSOLIDS TO LAND APPLICATION RAS WAS GRAVITY THICKENERS PRIMARY CLARIFIERS ANAEROBIC ANOXIC
M M
AEROBIC 5-STAGE BARDENPHO PROCESS SECONDARY CLARIFIERS ULTRAVIOLET DISINFECTION ANAEROBIC DIGESTERS PHOSPHORUS RELEASE TANK STRUVITE RECOVERY STRUVITE PELLETS GRAVITY BELT THICKENERS Metal-salt addition DEEP BED GRANULAR MEDIA FILTERS SECONDARY EFFLUENT PUMP STATION NITRATE-RICH MIXED LIQUOR RECIRC
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ANOXIC AEROBIC LAMELLA CLARIFIERS FLOCCULATION BASIN RAPID MIX SYSTEM Polymer Metal Salt EFFLUENT DISCHARGE GRAVITY BELT THICKENERS
2012 Annual Meeting of
Combination of Scenario 3 and Scenario 6
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Capital Costs For Each Scenario (Class 4 Level Estimates)
$0 $20,000,000 $40,000,000 $60,000,000 $80,000,000 $100,000,000 $120,000,000 $140,000,000 $160,000,000 Scenario 1 Scenario 2 Scenario 3 Scenario 4 Scenario 5 Scenario 6 Scenario 7 Scenario 8 Scenario 9
T O T A L C A P I T A L C O S T
Includes Construction and Non-Construction Cost
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Operations and Maintainence Costs
O&M cost estimates for each upgrades included:
Labor Power costs Chemical consumption costs
$0 $1,000,000 $2,000,000 $3,000,000 $4,000,000 $5,000,000 $6,000,000 Scenario 1 Scenario 2 Scenario 3 Scenario 4 Scenario 5 Scenario 6 Scenario 7 Scenario 8 Scenario 9
O & M C O S T S
2012 Annual Meeting of
Biosolids processing Maintenance and repair of major process equipment
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Life Cycle Costs Estimates
$0 $50,000,000 $100,000,000 $150,000,000 $200,000,000 $250,000,000 Scenario 1 Scenario 2 Scenario 3 Scenario 4 Scenario 5 Scenario 6 Scenario 7 Scenario 8 Scenario 9
L I F E C Y C L E ( N P V ) C O S T S
Capital and Present Worth of O&M Costs 2012 Annual Meeting of
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Greenhouse Gas Emissions (GHG) Estimates
Net nutrient limit related GHG emissions from the following sources were estimated:
- Power usage
- Chemical production and transportation
- Biosolids hauling and land application
- Process emissions from wastewater treatment
2012 Annual Meeting of
Scenario 1 Scenario 2 Scenario 3 Scenario 4 Scenario 5 Scenario 6 Scenario 7 Scenario 8 Scenario 9 Annual emissions from electrical usage
5,861 5,861 6,338 11,220 11,220 11,697 12,864 10,848 13,715
Annual emissions from chemical usage (includes production and transportation)
222 738 209 431 841 2,508 3,009 3,249
Annual emissions from biosolids transportation and land application
14 102 194 44 70 60 98
Annual process emissions from wastewater treatment
673 673 673 673 673 673
Total (tons CO2e/year)
5,875 6,185 7,270 12,102 12,368 13,281 16,045 14,590 17,753
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Summary
§ Process alternatives were developed for 9 different scenarios
- f nutrient limits
§ Capital, O&M and Life-Cycle costs and GHG emissions were
estimated for the upgrades
§ MMSD is using cost estimates for comparison with adaptive
management and nutrient trading alternatives
§ Non traditional approaches appear to be significantly more
cost effective but there is some uncertainty and risks associated
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