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Wastewater Charges Work Group

Wastewater Charges Work Group. August 2, 2018. Agend a. Welcome, Introduction & Desired Outcomes Opening Remarks Overview of the Wastewater System Wastewater Charges Methodology Summary Work Group’s Membership, Mission, & Guiding Principles Timeline & Next Steps. Desired Outcomes.

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Wastewater Charges Work Group

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  1. Wastewater Charges Work Group August 2, 2018

  2. Agenda Welcome, Introduction & Desired Outcomes Opening Remarks Overview of the Wastewater System Wastewater Charges Methodology Summary Work Group’s Membership, Mission, & Guiding Principles Timeline & Next Steps

  3. Desired Outcomes To deepen member-partners’ shared understanding of how the wastewater system operates under both dry and wet conditions, and the way GLWA’s charges methodology is currently structured, and To share a proposed work plan and timeline for refining the latter

  4. Opening Remarks Sue McCormick

  5. Overview of the Wastewater System Suzanne Coffey

  6. GLWA Service Area Macomb County M-59 M-59 Oakland County M-53 I-75 M-24 Woodward Ave I-96 I-696 I-696 8 Mile M-10 I-94 M-5 I-275 M-8 I-96 M-14 Detroit M-39 I-94 Wayne County

  7. GLWA Tier 1 Member Partners 17 1st Tier Member Partners M-59 M-59 I-75 M-53 M-24 Woodward Ave I-696 I-96 I-696 8 Mile M-10 M-5 I-275 I-94 M-8 I-96 M-14 M-39 I-94

  8. Tier 1 Member Partners Collection System Type color Combined = 24% Separated = 76%

  9. GLWA Interceptors NWI DRI NIEA

  10. GLWA Interceptors NIEA DRI NWI WRRF

  11. Collection System Elements Pipes • 190 Miles Pump Stations • 5 GLWA Pump Stations • 4 DWSD Pump Stations In-system Storage Dams • 13 Inflatable dams on GLWA and DWSD sewers • 56 MG of storage Valve Remotes • 17 Valve remote sites to regulate/divert flow in the collection system Sewer and Flow Monitoring Network • 26 Level sensors throughout the collection system to monitor trunk sewer and interceptor levels • 43 Sewer meters to monitor flows at the customer connections, interceptors, and GLWA facilities Precipitation Gage Network • 39 precipitation gages in the collection system to monitor rain intensity and volume CSO Outfalls • 39 Outfalls on Detroit River • 17 Outfalls on Rouge River • River level, sewer level and backwater gate monitoring

  12. Overview of System Components Dry Weather

  13. Northwest Interceptor City of Farmington RedfordTwp RedfordTwp Highland Park Orange area within Highland Park is tributary to North Interceptor East Arm (NIEA) NWI Dearborn Dearborn Wayne County (Dearborn Heights) Wayne County Dearborn Dearborn Wayne County Dearborn Dearborn Dearborn Dearborn Wayne County Allen Park Melvindale

  14. Northwest Interceptor City of Farmington RedfordTwp RedfordTwp Highland Park Detroit Tributary to NWI (Approximate) NWI Orange area within Highland Park is tributary to Northwest Interceptor (NWI) Dearborn Dearborn Wayne County (Dearborn Heights) Wayne County Dearborn Dearborn Wayne County Dearborn Dearborn Dearborn Allen Park Melvindale Dearborn Wayne County

  15. North Interceptor East Arm OMID GWKDD EFSDS Highland Park Hamtramck Orange area within Highland Park is tributary to North Interceptor East Arm (NIEA) Green area within Hamtramck is tributary to NIEA NIEA

  16. North Interceptor East Arm OMID GWKDD EFSDS Highland Park Hamtramck Detroit Tributary to NIEA (Approximate) Orange area within Highland Park is tributary to North Interceptor East Arm (NIEA) Green area within Hamtramck is tributary to NIEA Detroit Detroit NIEA Detroit WRRF

  17. Detroit River Interceptor Center Line Wayne County Northeast Harper Woods Grosse Pointe Farms Grosse Pointe Hamtramck Green area within Hamtramck is tributary to Detroit River Interceptor (DRI) Grosse Pointe Park DRI

  18. Detroit River Interceptor Center Line Wayne County Northeast Harper Woods Grosse Pointe Farms Detroit Tributary to DRI (Approximate) GPF Hamtramck Grosse Pointe Green area within Hamtramck is tributary to Detroit River Interceptor (DRI) Grosse Pointe Park DRI WRRF

  19. GLWA Interceptors NIEA DRI NWI WRRF

  20. Water Resource Recovery Facility (WRRF)Schematic Disinfection Kills disease-causing (pathogenic) organisms Secondary Treatment Removes organic matter both Non-settleable and Dissolved NIEA Preliminary & Primary Treatment Removes heavy Settleable solids FeCl3 NWI PUMP STA 2 FeCl3 DRO SECONDARY CLARIFIERS JUNCTION CHAMBER AERATION TANKS PUMP STA 1 PUMP STA 1 PROCESS WATER PRIMARY CLARIFIERS PRIMARY CLARIFIERS DRI SLUDGE PROCESSING- COMPLEX B DEWATERING PRESSES SLUDGE PROCESSING – COMPLEX A SO2 CHLORINE SLUDGE STORAGE BIOSOLIDS DRYER FACILITY DEWATERING CENTRIFUGES INCINERATORS Residuals Sludge is dried and formed into fertilizer pellets for beneficial reuse Dewatering Removes water from solids to reduce volume before disposal Residuals Sludge is incinerated and the resulting ash is landfilled

  21. Water Resource Recovery Facility (WRRF)Physical Layout NORTH NIEA NWI PUMP STA. 2 RECTANGULAR PRIMARY SEDIMENTATION TANKS PE-AS CIRCULAR PRIMARY SEDIMENTATION TANKS BRENNAN NWI COPLAND PUMP STA. 1 ROUGE RIVER RRO DRI CHLORINE JUNCTION CHAMBER DRO-1 W. JEFFERSON AVE. TO DETROIT RIVER

  22. Dry WeatherPreliminary & Primary Treatment • OPERATION • PS-1 and PS-2 pump 450 MGD as average dry weather flow • Screens remove large items (screenings) at both pump stations • Ferric chloride added to remove excess phosphorus (P) • Grit removal systems at both pump stations • Rectangular and circular primary clarifiers slow flow to settle solids. • Removes 60 to 65% of suspended solids (TSS) and biochemical oxygen demand (BOD) • Fats, oils and grease (FOG) is skimmed • Screenings, skimmed material and grit are landfilled NORTH NIEA NWI PUMP STA. 2 RECTANGULAR PRIMARY SEDIMENTATION TANKS PE-AS CIRCULAR PRIMARY SEDIMENTATION TANKS BRENNAN NWI COPLAND ROUGE RIVER PUMP STA. 1 DRI CHLORINE JUNCTION CHAMBER DRO-1 W. JEFFERSON AVE. TO DETROIT RIVER

  23. OPERATION • Aeration tanks provide oxygen for microorganisms (biomass) to thrive • Target to keep the microorganism population stable • Secondary clarifiers slow flow for microorganisms to settle • Processes remove nearly all remaining • Suspended solids (TSS) • Phosphorous (P) • Organic matter or Biochemical Oxygen Demand (BOD) Dry WeatherSecondary Treatment NORTH O2 STORAGE (BACKUP TO SUPPLY-PIPELINE) PE-AS AERATION TANKS BRENNAN COPLAND SECONDARY CLARIFIERS SECONDARY CLARIFIERS SCREENED FINAL EFFLUENT PROCESS W. JEFFERSON AVE. TO DETROIT RIVER

  24. OPERATION • Add chlorine to kill pathogens (disinfect) • Add sulfur dioxide to remove any remaining chlorine after disinfection Dry WeatherDisinfection NORTH JUNCTION CHAMBER W. JEFFERSON AVE. CHLORINATION DETROIT RIVER OUTFALL DRO DECHLORINATION Rouge River Zug Island Detroit River

  25. OPERATION • Allow time for sludge to thicken • Send thickened sludge to the biosolids dryer first where the BDF facility dewaters with centrifuges • Dewater the remaining sludge • Add polymer to improve dewatering • Dewater with belt filter presses Dry WeatherDewatering NORTH SLUDGE PROCESSING COMPLEX A SLUDGE PROCESSING COMPLEX B DEWATERING COMPLEX 1 BRENNAN COPLAND DEWATERING COMPLEX 2 W. JEFFERSON AVE.

  26. OPERATION • Prioritize beneficial reuse through production of fertilizer pellets • Incinerate remaining sludge with upgraded emissions equipment that meets the Maximum Achievable Control Technology (MACT) standards • Minimize use of natural gas • Keep exhaust gases cool and clean • Offload facility is in standby Dry WeatherResiduals Disposal NORTH OFFLOADING FACILITY BRENNAN COPLAND INCINERATION COMPLEX W. JEFFERSON AVE. BIOSOLIDS DRYER FACILITY

  27. Overview of System Components Wet Weather

  28. GLWA Wet Weather Facilities WRRF

  29. GLWA Wet Weather Facilities WRRF

  30. GLWA Wet Weather Facilities WRRF

  31. GLWA Wet Weather Facilities WRRF

  32. GLWA Wet Weather Facilities WRRF

  33. GLWA Wet Weather Facilities WRRF

  34. Northwest Interceptor City of Farmington 7 Mile RTB RedfordTwp Detroit Tributary to NWI (Approximate) RedfordTwp Highland Park Puritan Fenkell RTB NWI Wayne County (Dearborn Heights) Dearborn Dearborn Baby Creek SDF Wayne County Hubble Southfield RTB Dearborn Dearborn Wayne County Dearborn Dearborn Treated Discharge Dearborn WRRF Dearborn Wayne County Allen Park WRRF Effluent Melvindale Untreated Discharge Oakwood RTB

  35. North Interceptor East Arm OMID GWKDD EFSDS Detroit Tributary to NIEA (Approximate) Highland Park Hamtramck Detroit NIEA Detroit Leib SDF Detroit WRRF Treated Discharge WRRF Effluent Untreated Discharge

  36. Detroit River Interceptor GWKDD EFSDS Center Line Wayne County Northeast Harper Woods Detroit Tributary to DRI (Approximate) Dotted areas indicate area is tributary to both NIEA and DRI during wet weather Complex and variable flow patterns occur during wet weather events GPF Highland Park GP Hamtramck Conner Creek RTB GPP St. Aubin SDF Leib SDF DRI Treated Discharge Belle Isle RTB WRRF WRRF Effluent Untreated Discharge

  37. GLWA Wet Weather Facilities WRRF

  38. Regional System Operational Elements WRRF

  39. GLWA Interceptors NIEA DRI NWI WRRF

  40. Water Resource Recovery Facility (WRRF)Schematic Primary Effluent Flows in Excess of 930 MGD NIEA SODIUM BI SULFITE SODIUM HYPO CHLORITE CHLORINE FeCl3 RRO NWI SO2 PUMP STA 2 FeCl3 DRO SECONDARY CLARIFIERS JUNCTION CHAMBER AERATION TANKS PUMP STA 1 PUMP STA 1 PROCESS WATER PRIMARY CLARIFIERS PRIMARY CLARIFIERS DRI SLUDGE PROCESSING- COMPLEX B DEWATERING PRESSES SLUDGE PROCESSING – COMPLEX A CENTRAL OFFLOAD FACILITY Residuals Central Offload Facility loads trucks of stabilized biosolids for landfill disposal SLUDGE STORAGE BIOSOLIDS DRYER FACILITY DEWATERING CENTRIFUGES INCINERATORS

  41. Wet WeatherPreliminary & Primary Treatment • OPERATION • PS-1 and PS-2 pump up to 1700 MGD peak wet weather flow • Screens remove large items (screenings) • Ferric Chloride added to remove excess phosphorus (P) • Grit increases with wet weather • Flows up to 930 MGD receive full secondary treatment, disinfection and dichlorination • Flows in excess of 930 MGD receive primary treatment (including phosphorus removal), disinfection and dichlorination • DRO primary effluent is disinfected and dechlorinated • RRO primary effluent is currently not disinfected. The RRO Disinfection Project will provide disinfection and dichlorination for the RRO primary effluent NORTH NIEA NWI PUMP STA. 2 RECTANGULAR PRIMARY SEDIMENTATION TANKS PE-AS CIRCULAR PRIMARY SEDIMENTATION TANKS BRENNAN ONWI COPLAND ROUGE RIVER TO ROUGE RIVER RRO PUMP STA. 1 DRI CHLORINE JUNCTION CHAMBER DRO-1 DRO-1 W. JEFFERSON AVE. TO DETROIT RIVER

  42. OPERATION • Flows up to 930 MGD receive full secondary treatment • Aeration tanks provide oxygen for microorganisms (biomass) to thrive • Target to keep the microorganism population stable • Secondary clarifiers slow flow for microorganisms to settle • Processes remove nearly all remaining • Suspended solids (TSS) • Phosphorous (P) • Organic matter or Biological Oxygen Demand (BOD) Wet WeatherSecondary Treatment NORTH O2 STORAGE (BACKUP TO SUPPLY-PIPELINE) PE-AS AERATION TANKS BRENNAN COPLAND SECONDARY CLARIFIERS SECONDARY CLARIFIERS SCREENED FINAL EFFLUENT PROCESS W. JEFFERSON AVE. TO DETROIT RIVER

  43. OPERATION • Add chlorine to kill pathogens (disinfect) • Add sulfur dioxide to remove any remaining chlorine after disinfection Wet WeatherDisinfection NORTH JUNCTION CHAMBER W. JEFFERSON AVE. CHLORINATION DETROIT RIVER OUTFALL DRO DECHLORINATION Rouge River Zug Island Detroit River

  44. OPERATION • Allow time for sludge to thicken • Send thickened sludge to the biosolids dryer first where the BDF facility dewaters with centrifuges • Dewater the remaining sludge • Add polymer to improve dewatering • Dewater with belt filter presses first • Dewater with centrifuges as needed Wet WeatherDewatering NORTH SLUDGE PROCESSING COMPLEX A SLUDGE PROCESSING COMPLEX B DEWATERING COMPLEX 1 BRENNAN COPLAND DEWATERING COMPLEX 2 W. JEFFERSON AVE.

  45. OPERATION • Prioritize beneficial reuse through production of fertilizer pellets • Sludge in excess of the BDF capacity is incinerated or offloaded • Central Offload Facility stabilizes sludge prior to loading to trucks for landfilling Wet WeatherResiduals Disposal NORTH OFFLOADING FACILITY BRENNAN COPLAND INCINERATION COMPLEX W. JEFFERSON AVE. BIOSOLIDS DRYER FACILITY

  46. Dry Weather vs. Wet Weather

  47. Dry Weather vs. Wet Weather Pump Stations

  48. Dry Weather vs. Wet Weather at WRRF

  49. WRRF Unit Process Capacities

  50. Considerations Rainfall is rarely spatially uniform producing complex and variable flow patterns Member Partners have a wide range of actual flows and contract capacities GLWA currently has a high level of control in the system with gates, in-system storage devices, pump stations and regulators Updating models and running scenarios is providing ideas for further optimization Optimization of existing assets involves moving flows around the system and storing in locations that will vary significantly from storm to storm Although the wastewater system is currently treating approximately 97% of wet weather flows, untreated discharges still occur Coordinated regional operations is key

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