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 Nehm, Alan Grooms, Bruce Borelli, Matt Allen, Madison Metropolitan Sewerage 2012 Annual Meeting of
Background The Nutrient Problem Over-fertilization of water bodies - a widespread national and global problem Beneficial uses become impaired Phosphorus and/or Nitrogen are sources of many impairments 2012 Annual Meeting of
Background The Nutrient Problem Madison Metropolitan Sewerage District (MMSD) is anticipating lower nutrient limits because of: Recent administrative rule revisions and the Rock River total maximum daily load addressing phosphorus Future regulations addressing nitrogen 2012 Annual Meeting of
Background The Nutrient Problem 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 2012 Annual Meeting of
Background MMSD’s Approach: Assess the cost impacts for 9 scenarios of potential low nutrient discharge limits Nutrient Discharge Limit Scenarios Analyzed for Treated Effluent Scenario Total Phosphorus, mg/L Total Nitrogen, mg/L 1 None 1 0.225 2 2 None 1 0.130 2 3 None 1 0.075 3 4 10 2 0.225 2 5 10 2 0.130 2 6 10 2 0.075 3 7 3 2 0.225 2 8 3 2 0.130 2 9 3 2 0.075 3 1 Existing ammonia limits apply 2 Monthly average concentrations 3 Annual average concentrations 2012 Annual Meeting of
Project Objectives 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 operating 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 2012 Annual Meeting of
Existing Nine Springs WWTP (NSWWTP) § Average Flow Capacity = 57 MGD § Peak Flow Capacity through Disinfection= 110 MGD WEST PLANT EAST PLANT 2012 Annual Meeting of Central States WEA
Nine Springs WWTP (NSWWTP) Process Flow Diagram after Ongoing Construction ANAEROBIC RECYCLE M M MODIFIED UCT PROCESS SECONDARY PRIMARY HEADWORKS CLARIFIERS CLARIFIERS EFFLUENT DISCHARGE ANOXIC ANAEROBIC AEROBIC RAS ULTRAVIOLET DISINFECTION M A/O PROCESS SECONDARY CLARIFIERS ANAEROBIC AEROBIC RAS WAS STRUVITE PHOSPHORUS GRAVITY BELT STRUVITE PELLETS RECOVERY RELEASE TANK THICKENERS GRAVITY GRAVITY BELT THICKENERS ANAEROBIC THICKENERS DIGESTERS BIOSOLIDS TO LAND APPLICATION 2012 Annual Meeting of
Developing and Screening Process Alternatives Nutrient removal alternatives matrix was developed to capture an array of viable approaches, including: o Biological and chemical phosphorus removal approaches o Different configurations for biological nitrogen removal o 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
Methodology § A Steady State, Excel Based, Whole Plant Simulator - CH2M HILL’s PRO fessional PRO cess D esign 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 Layout CPES Information Design Basis Specifications GPSx Pro2D Biowin QUALITY CONTROL ASM CH2M HILL Experience Residuals Mass Process Models Balance Liquids Biological Process Models Process Models
Modifications to NSWWTP for Scenario 1 and 2 Nutrient Control Scenario 1 = TP 0.225 mg/L; Scenario 2 = TP 0.130 mg/L (Monthly Basis) ANAEROBIC RECYCLE Metal-salt addition M M MODIFIED UCT SECONDARY PROCESS PRIMARY HEADWORKS CLARIFIERS CLARIFIERS EFFLUENT SECONDARY DISCHARGE EFFLUENT DEEP BED ANAEROBIC ANOXIC AEROBIC PUMP GRANULAR STATION MEDIA FILTERS RAS ULTRAVIOLET DISINFECTION M A/O PROCESS 79 MGD, 300 HP SECONDARY CLARIFIERS Capacity + Spare ANAEROBIC AEROBIC 10 active filters, RAS each 5-ft deep and 1,100-sq ft area + WAS Spare STRUVITE PHOSPHORUS GRAVITY BELT STRUVITE THICKENERS RECOVERY RELEASE TANK PELLETS Metal salt receiving and feed facility GRAVITY GRAVITY BELT THICKENERS ANAEROBIC THICKENERS DIGESTERS BIOSOLIDS TO LAND APPLICATION 2012 Annual Meeting of
Modifications to NSWWTP for Scenario 3 Nutrient Control Scenario 3: TP limits of 0.075 mg/L on an Annual Average Basis ANAEROBIC RECYCLE Metal-salt Metal Salt Polymer addition M M MODIFIED UCT PROCESS SECONDARY FLOCCULATION LAMELLA PRIMARY HEADWORKS BASIN CLARIFIERS CLARIFIERS EFFLUENT CLARIFIERS SECONDARY DISCHARGE EFFLUENT RAPID MIX DEEP BED SYSTEM PUMP ANOXIC ANAEROBIC AEROBIC GRANULAR STATION MEDIA FILTERS RAS ULTRAVIOLET DISINFECTION M System sized to A/O PROCESS handle a maximum SECONDARY CLARIFIERS flow rate of 79 MGD. ANAEROBIC AEROBIC Total required RAS clarifier area WAS = 19,500 sq-ft. Rapid Mix Tanks = STRUVITE PHOSPHORUS GRAVITY BELT STRUVITE PELLETS RECOVERY RELEASE TANK THICKENERS 9,700-sq-ft Flocculation Tanks = 20,800 sq-ft GRAVITY GRAVITY BELT THICKENERS ANAEROBIC THICKENERS DIGESTERS BIOSOLIDS TO LAND APPLICATION 2012 Annual Meeting of
Modifications to NSWWTP for Scenario 4 and 5 Nutrient Control § 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) NITRATE-RICH MIXED ANAEROBIC LIQUOR RECIRC 7.34 MG Anoxic RECYCLE Metal-salt Volume + NRCY addition M M M MODIFIED UCT SECONDARY PRIMARY PROCESS HEADWORKS CLARIFIERS CLARIFIERS EFFLUENT SECONDARY DISCHARGE EFFLUENT DEEP BED ANOXIC ANAEROBIC AEROBIC PUMP GRANULAR STATION MEDIA FILTERS RAS ULTRAVIOLET DISINFECTION M M SECONDARY CLARIFIERS 0.84 MG Anoxic ANAEROBIC ANOXIC AEROBIC Volume + NRCY RAS WAS STRUVITE STRUVITE PHOSPHORUS GRAVITY BELT RECOVERY RELEASE TANK PELLETS THICKENERS GRAVITY GRAVITY BELT THICKENERS ANAEROBIC THICKENERS DIGESTERS BIOSOLIDS TO LAND APPLICATION 2012 Annual Meeting of
Modifications to NSWWTP for Scenario 6 Nutrient Control 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 ANAEROBIC NITRATE-RICH MIXED Metal RECYCLE LIQUOR RECIRC Metal-salt Salt Polymer addition M M M MODIFIED UCT FLOCCULATION LAMELLA SECONDARY PRIMARY PROCESS HEADWORKS BASIN CLARIFIERS EFFLUENT CLARIFIERS CLARIFIERS SECONDARY DISCHARGE EFFLUENT RAPID MIX DEEP BED SYSTEM PUMP GRANULAR ANAEROBIC ANOXIC AEROBIC STATION MEDIA FILTERS ULTRAVIOLET RAS DISINFECTION M M SECONDARY CLARIFIERS Combination of Scenario 3 and ANAEROBIC ANOXIC AEROBIC Scenario 4, 5 RAS WAS STRUVITE PHOSPHORUS GRAVITY BELT STRUVITE RECOVERY RELEASE TANK THICKENERS PELLETS GRAVITY GRAVITY BELT THICKENERS ANAEROBIC THICKENERS DIGESTERS BIOSOLIDS TO LAND APPLICATION 2012 Annual Meeting of
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 Existing Treatment Tank Volume Expanded By ~4MG + Blowers + Secondary Clarifiers + RAS, WAS pumps + NRCY Pumps 2012 Annual Meeting of
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 NITRATE-RICH MIXED LIQUOR RECIRC Metal-salt addition M M M M SECONDARY PRIMARY HEADWORKS CLARIFIERS CLARIFIERS EFFLUENT SECONDARY DISCHARGE EFFLUENT DEEP BED ANOXIC PUMP ANAEROBIC AEROBIC ANOXIC AEROBIC GRANULAR STATION MEDIA FILTERS 5-STAGE BARDENPHO PROCESS ULTRAVIOLET DISINFECTION M M M ANAEROBIC ANOXIC AEROBIC ANOXIC MBR Designed to RAS treat 9.20 MGD WAS STRUVITE STRUVITE PHOSPHORUS GRAVITY BELT RECOVERY RELEASE TANK THICKENERS PELLETS GRAVITY GRAVITY BELT THICKENERS ANAEROBIC THICKENERS DIGESTERS BIOSOLIDS TO LAND APPLICATION 2012 Annual Meeting of
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 NITRATE-RICH MIXED LIQUOR RECIRC Metal Salt Polymer Metal-salt addition M M M M SECONDARY FLOCCULATION LAMELLA PRIMARY HEADWORKS BASIN CLARIFIERS EFFLUENT CLARIFIERS CLARIFIERS SECONDARY DISCHARGE EFFLUENT RAPID MIX DEEP BED PUMP SYSTEM ANOXIC GRANULAR ANAEROBIC AEROBIC ANOXIC AEROBIC STATION MEDIA FILTERS ULTRAVIOLET 5-STAGE BARDENPHO PROCESS DISINFECTION RAS Combination of Scenario 3 and Scenario 6 WAS STRUVITE PHOSPHORUS GRAVITY BELT STRUVITE RECOVERY RELEASE TANK THICKENERS PELLETS GRAVITY GRAVITY BELT THICKENERS ANAEROBIC THICKENERS DIGESTERS BIOSOLIDS TO LAND APPLICATION 2012 Annual Meeting of
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