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buildup reaches a certain depth, the treatment ponds need to be taken out of service, dredged, and then have the sludge hauled away to a dump site. This happens every 12 to 15 years but is very costly for the city. Additionally, the new system is modular and upgradeable, so if plant flows increase, the system can be added on to. Or, if new permit requirements are enforced, a tertiary treatment system can be added to the existing system to increase the levels of treatment. Five Phases Of Energy Analysis In order to determine the energy and utility savings that would be seen from this project, a five-step process was used including: Benchmarking The first step in the analysis was to benchmark the WWTP's energy use to identify the magnitude of energy savings available. Monthly utility bills from August 2010 through September 2012 were collected to determine the annual energy consumption of the plant. Monthly operating reports were also collected, which showed the plant's daily flows and loadings. This data was then compared with industry benchmarks to identify the potential savings opportunity. Based on these comparisons, it was apparent that Riverbank's WWTP was using more energy than needed. In fact, the opportunity to save 50 percent or more in energy was anticipated based on analysis. Baseline Utility Analysis The next step was to create a utility baseline. The two years' of energy and demand usage from the monthly billing data were compared year to year to identify any anomalies or changes in operation. In addition, 15-minute interval data was collected from the electric meter for the most recent 12 months. This data was analyzed and found to be very consistent between the days in a given week or month, except when maintenance activities occurred. The utility rate was also evaluated, using a tariff simulation to verify that the rate structure was understood. Baseline Energy Analysis An energy baseline of the plant was then created to ensure operations were understood. Operational information was collected through interviews with plant operators as well as analysis of utility data, which showed that plant energy usage decreased from the first year to the second year. The interval data was very helpful, as it also provided insight into the operation of the plant and how the loads were being controlled. The plant operated at a nearly constant load throughout the day with an approximate 110 kW increase in load between 2 a.m. and 8 a.m. Upon further analysis, the base load corresponded to seven of the surface aerators operating at a time, while the increased load corresponded to nine of the surface aerators operating. It was also noticed in the interval data that only eight of the surface aerators wateronline.com n Water Innovations 27 GREENTECHNOLOGIES Anue Water Technologies is the leader in highly-effective and sustainable engineered technologies designed with full telemetry capabilities for remote programming and control. Patented FOG removal and prevention products and integrated ozone and oxygen generation systems are proven solutions for point source odor and force main corrosion control. With the aging of America's municipal waste water facilities, ANUE's patented solutions provide safe, non-hazardous, and cost-effective methods for the elimination and prevention of FOG, odor and corrosion. ANUE's systems are used successfully by municipalities across North America as well as several countries worldwide. CONTROL FOG, ODOR AND CORROSION www.anuewater.com 760-727-2683 sales@anuewater.com