Moving Toward Resource Recovery: Energy Management

Transcription

1 Moving Toward Resource Recovery: Energy Management MWPCA Quarterly Meeting June 17, 2015 Elizabeth Watson, PE, LEED AP United Water Energy Manager 1

2 Agenda Moving Toward Resource Recovery Nutrients Energy Water Energy Management Energy Efficiency Power Monitoring Tariff Optimization Funding Opportunities 2

3 Nutrient Recovery 3

4 Nutrient Recovery Methods Biosolids Land Application Struvite Crystallization Ex: Ostara at Hampton Roads Sanitation District in Suffolk, Virginia Algae Accumulation Ex: Clearas at Upper Blackstone Water Pollution Abatement District in Millbury, Mass Plant Accumulation Ex: Anheuser Busch Nutri-Turf Resource Recovery Farm in Jacksonville, Florida 4

5 Energy Recovery 5

6 Energy Recovery Chemical Biogas Biofuels Thermal Conversion (Combustion) Electrochemical Conversion Thermal Heat Energy Recovery from Generators and Incinerators Heat Energy Recovery from Biochemical Conversion Processes Direct Heat Energy from Wastewater Hydropower Microbial Fuel Cells 6

7 BIOGAS UTILIZATION (PONTIAC MI AND LI NY) Pontiac MI: Biogas driven blower equivalent to 150 HP blower Nassau County NY: Bay Park operates four 3.6 MW Cooper-Bessemer engines (typically 3 on-line) Cedar Creek operates five 3.0 MW Cooper-Bessemer engines (typically 3 on-line) All the engines can operate on diesel, natural gas or digester gas. Both facilities operate CHP with electricity generation, steam loops, hot water loops, chillers and coolers. There is a low-grade waste heat that we are currently planning to install an organic Rankine cycle (ORC) on to capture this energy. Applied for NY PRIZE microgrid grant 7

8 WASTEWATER EFFLUENT HYDRO Arlington WWTP in Poughkeepsie NY 12kW possible, however, target will be 6kW for pilot 8

9 Other Energy Recovery Case Studies Co-digestion Ex: EBMUD in Oakland, California Thermal Hydrolysis Ex: Cambi at DC Water Blue Plain AWTP Thermal Energy Recovery Ex: James C. Kirie Water Reclamation Plant in Des Plaines, Illinois 9

10 Water Recovery Case Studies Fit for Purpose Water Ex: West Basin Water Recycling Facility in El Segundo, California Nonpotable Reuse San Antonio Water System (3 facilities) stream augmentation (51%) golf course irrigation (16%) other irrigation (19%) cooling and other industrial uses (14%) Direct Potable Reuse Windhoek Water Reclamation Plant in Windhoek, Namibia Big Spring Regional Water Reclamation Project in Big Spring, Texas 10

11 For More Information Moving Toward Resource Recovery Facilities Published by WEF in 2014 Prepared by the Moving Toward Resource Recovery Facilities Task Force of WEF Art K. Umble, Ph.D., P.E., BCEE, Chair Leon S. Downing, P.E., Ph.D., Vice-Chair And 76 co-authors! 11

12 ENERGY EFFICIENCY Aeration Pumps Lighting HVAC 12

13 ENERGY EFFICIENCY - PUMPS Design (and Replacement) Select pumping systems based on their life cycle cost Replace or rehab pumps with 5-7 year payback in energy savings Include a jockey pump if there are wide variations in flow Use VFDs and premium efficiency motors Include flow, pressure and power data in SCADA Pursue electric utility incentives Construction Require onsite pump efficiency testing and establish VFD minimum setpoints as part of commissioning Operation Know which pump is more efficient and operate it as the duty Maintenance Regular maintenance through Computerized Maintenance Management Systems (CMMS) Identify inefficient pumps through pump efficiency testing every 2-3 years 13

14 ENERGY EFFICIENCY - AERATION Improve primary clarification Reduce inflow and infiltration Sidestream treatment and flow control Identify inefficient blowers through blower efficiency testing Replace blowers with low efficiencies Resize blowers High efficiency turbo blowers Ultrafine bubble aeration Variable frequency drives Automatic dissolved oxygen (DO) control Nutrient and/or biological control (e.g. Hach or Greenbass) Most open valve (MOV) Eliminate air leaks Track blower system efficiencies through SCADA Use hyperbolic mixer/aerators (e.g. Invent) or compressed air mixing (e.g. EnviroMix) Secure electric utility incentives for new energy efficient aeration systems, including blowers, diffusers and controls 14

15 ENERGY EFFICIENCY LIGHTING AND HVAC Lighting Turn off lights after exiting a room or facility Install occupancy sensors and other controls, if possible NOTE: Most process areas may not have occupancy sensors due to OSHA compliance Install LEDs and other energy efficient fixtures Pursue prescriptive incentives for energy efficient lighting fixtures and controls HVAC Turn down the HVAC when exiting a room or facility Establish standards for heating and cooling temperature settings for all locations Install programmable thermostats in occupied spaces and adjust set points to lower heating and raise cooling temperatures during nights and weekends Adjust set points in process areas to lower heating temperatures to 55 degrees F and raise cooling temperatures to 85 degrees F, as allowed by the process and equipment Install timers in process areas that allow staff to adjust the temperature while they are occupying the space, but automatically revert back to standard set points after 8 hours Install energy efficient HVAC equipment and pursue prescriptive incentives 15

16 POWER MONITORING Facility-wide power monitoring Add power monitoring for large equipment (50 HP and larger) Will allow KPIs to be tracked through SCADA KPIs: MWh/MG, Wire to Water Efficiency, Pump Efficiency 16

17 TARIFF OPTIMIZATION Review Your Electric Bills Demand Charges Time of Use Aggregate accounts Separate supply and T&D bills 17 Commercial Power LLC, 2013

18 FUNDING OPPORTUNITIES Electric Utility Incentives Eversource National Grid Holyoke Gas & Electric Other municipal electric utilities Mass Save State Programs MassCEC Hydropower Wind Solar Hot Water Biomass Boilers State Revolving Fund Renewable Energy Credits RECs SRECs Federal Tax Incentives 18

19 Thank You! Elizabeth Watson, PE, LEED AP United Water Energy Manager UnitedWater.com