Outfitting aeration tanks with fine pore diffusers is one way to achieve significant energy savings
by Lori Reynolds
As part of the EPA mid-Atlantic Energy Team, I talk with water and wastewater treatment plant operators across the region and they’ve shared with me this eye-opening fact: energy is a facility’s largest controllable budget item. Since energy accounts for about one-third of the operating budget for drinking water and wastewater systems, it’s a logical place to look for savings. I’ve also learned that operators have a good understanding of where the energy is being used in the facility and have great ideas for cost-saving equipment or process changes.
How can those energy-saving ideas make it from concept into practice? One approach is enlisting an “energy champion” for these facilities that are on the front lines of protecting public health and the environment. Having someone who can work directly with operators and speaks the language of the municipal decision makers can provide the key to saving energy (and money!) at these facilities.
If a community is looking to save money or reduce its carbon footprint, water utility energy efficiency is a great way to jump start those efforts. EPA has resources and success stories – including an energy management guidebook – that are valuable references.
The work of an energy champion usually begins by reviewing the energy bill with the operator, and determining what simple operational changes could save money right away. For example, staggering the start-up of motors and equipment to reduce the demand charge or filling storage tanks at night to avoid peak rates.
Energy champions also play a critical role in documenting savings, which can help a facility gain support for additional energy efficiency projects. We all know that sometimes you have to spend a little money now to save a lot of money in the long run. That’s where those savings from the early operational changes come in handy: as those savings accrue, they can be reinvested in capital projects to further reduce energy use. Bigger projects, like installation of energy efficient pumps and motors often have a longer payback period, but have the potential to reap the rewards of even bigger savings.
The decision by a water or wastewater treatment plant to invest time and money in energy savings is a commitment to lower utility bills. An energy champion who can work with operators, decision makers, and municipal engineers can make a real difference for a community by turning a huge energy consumer into one that uses “net zero” energy.
About the author: Lori Reynolds works in the Region’s Office of Infrastructure and Assistance, which provides funding to states for water and wastewater infrastructure. To sustain the investment, Lori and others in the office promote energy and water conservation and proactive operation and maintenance planning to extend the useful life of infrastructure assets.
