Energy Management A Small System Approach

2. Energy ManagementA Small System Approach Providing wastewater and drinking water to the citizens of your State requires a significant use of energy on a daily basis. Energy costs are steadily rising. Energy management has become one of the most significant issues facing wastewater and water utilities today with your water and wastewater utility consumption responsible for 30-60% of your energy bill. This course will provide superintendents, town managers and municipal officials with a step-by-step methodology to identify, implement, measure, and improve energy efficiency at their wastewater treatment utilities. Specifically, we will go process by process, look at what each device does, and determine how we can reduce energy costs by controlling the process and equipment.

3. Energy ManagementA Small System ApproachLearningObjectives Describe and understand basic electrical terminology Read and interpret utility electrical tariff Organize your conservation effort Determine your present energy consumption Conduct a survey of specific equipment and processes Evaluate potential Energy Conservation Measures (ECMs) Discus how to implement and monitor your progress and success

4. Energy ManagementA Small System ApproachAgenda • Energy Conservation – Small WWTP’s Biological Processes • Definitions, Formulas and Basic Concepts • The Energy Management Plan • Performing an Audit and Assessing Data • Process & Equipment – ECM’s

5. Energy Conservation Small WWTP’s Biological Processes

6. The Energy Cycle? Power Power Power Pumping Aeration Water Treatment Plant Homes Wastewater Treatment Pumping Pumping Water Source Distribution Power Collection Power Back to a Water Source In this class we will deal with the power to move and treat the water or wastewater in a plant.

7. Energy Conservation Small WWTP’s Biological Process Basic Activated Sludge Nitrogen removal • BNR • ENR Phosphorus removal • Chemical • Biological • Sludge Processing

8. Nitrogen Removal BNR & ENR Total Nitrogen = TN = TKN + NOx TKN = Org N + NH4, NOx = NO2 + NO3 BNR = Biological Nutrient Removal TN = 8.0 mg/l ENR = Enhanced Nutrient Removal TN = 4.0 mg/l

9. Nitrogen Removal Nitrification – Requires Aerobic Conditions NH4 ----------- NO3 MLDO ~ 2.0 – 4.0 mg/l

11. Nitrogen Removal Denitrification – Requires Anoxic Conditions NO3 ------------- N2 Anoxic Conditions - No DO

12. Three Stage Nitrogen Removal Process Post Denitrification

13. Modified Ludzack-Ettinger (MLE) Process Nitrate Recycle Primary Effluent Anoxic Aerobic RAS WAS

14. Energy Conservation & Nitrogen Removal • Consequences of inadequate aeration on TN. • Consequences of excessive aeration on TN.

16. Energy Conservation • Options for maintaining appropriate levels of aeration to achieve consistent performance. • Impact of seasonal changes on DO control. • DO Control systems

17. Enhanced MLE – 4-Stage Bardenpho Nitrate Recycle Methanol Primary Effluent Aerobic Aerobic Anoxic Anoxic RAS WAS

19. PhosphorusRemoval Chemical Precipitation • Chemical feed system control • Quantity used Biological Treatment • Impact of DO and recycles

20. Energy ConservationWAS – Processing Aerobic Digester or Aerated WAS Holding Tank Aeration strategy Impacts of cyclic aeration

21. Remember Your Priorities • First Priority : Meet the permit limits • Second Priority: Energy Conservation