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Municipal Wastewater Efficiency Improvements

Municipal Wastewater Efficiency Improvements. Potential Savings for the 6 th Power Plan September 30, 2008 Regional Technical Forum. South Treatment Plant - Renton,Washington. Municipal Wastewater Industry in the PNW. Over 800 Plants use 175 aMW of Energy Processes Include Collection

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Municipal Wastewater Efficiency Improvements

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  1. Municipal Wastewater Efficiency Improvements Potential Savings for the 6th Power Plan September 30, 2008 Regional Technical Forum South Treatment Plant - Renton,Washington

  2. Municipal Wastewater Industry in the PNW • Over 800 Plants use 175 aMW of Energy • Processes Include • Collection • Treatment • Sludge Processing & Disposal • Discharge Picture from: Arkansas Watershed Advisory Group

  3. The Many Factors that Affect Plant Energy Consumption • Influent Biological Oxygen Demand (BOD) • Effluent BOD • Weather/Location • MGD design capacity • MGD flow • Primary Clarifier Effectiveness • Secondary Treatment Process Type • Activated Sludge • Coarse or fine bubble aeration • Dissolved Oxygen control method • Aerated Lagoon • Dispersed Aeration or Mechanical Aeration • Varying amounts of aeration • Trickle Filter • Disinfection method (Chlorine or UV) • Tertiary Treatment Process Type • Sludge Treatment Processes • Dewatering method • Digestion • Onsite Generation (IC Engine or Micro-Turbine Using Digester Gas, Micro-Hydro at discharge, etc.) Lebanon, OR

  4. Energy Savings Measures • Energy Savings Measures • VFDs • Upgrade to premium efficiency motors • Aeration blower control via automated dissolved oxygen monitoring • Fine bubble diffusers • Optimize pumping and blower configurations and operation/controls • Upgrade to more efficient pumps and blowers • Use hydraulic digester mixing & optimize mixing time • Lighting Fine Bubble Diffusters from sequencertech.com Blower from spenserturbine.com DO Control from wateronline.com

  5. 5th Power Plan Summary • Technical Potential Retrofit Measures = 50.5 aMW New Construction = 14.5 aMW 65.0 aMW • Plan called for a total of 37 aMW of energy savings at 1.4 cents/kWh. Achievements since 5th Plan • Energy Trust of Oregon: • 23 Projects • Savings = 1.5 aMW • Measure Cost = $10 million

  6. Update for 6th Plan: Data Sources

  7. Proposed Changes to Savings

  8. More on Savings Change large activated sludge plant baseline consumption because: Change % savings available to medium activated sludge plants because:

  9. Proposed Changes to Cost & Benefits 5th Plan Assumptions: • Measure Cost: • $20k to $200k depending on size (or about $0.10/kWh) • O&M Costs: • $500/mo service agreement • Non Energy Benefits: • $34k/year per facility for reduced manual DO sampling • $5/day for reduced polymer purchased in AS systems • $10k-25k/MGD for reduction in solids

  10. Summary – 6th Plan Proposal • New Construction Savings • Projected Additional Capacity: 288 MGD • Projected Additional Load: 20 aMW • Technical Potential: 3.3 aMW • Retrofit Savings • Technical Potential: 27.5 aMW

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