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Instrumentation Package for Wastewater Aeration Control

December 22, 2011
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The Instrumentation for Aeration Control package is geared specifically toward advanced aeration control strategies. Instruments available measure dissolved oxygen, nitrate, ammonium, pH, suspended solids, temperature, air flow rates, air pressures and water levels in aeration basins to provide enhanced and reliable control of a process. Direct measurement of these parameters can drastically reduce energy costs associated with operating aeration basins. The combination of sensors and transmitters ensures that the proper amount of air is blown through the system at the correct basin level, and that the process is removing nutrients from the water efficiently and reliably.The family of aeration control sensors easily connects to any plant’s PLC or SCADA system via 4-20mA with HART, Profibus or other digital interfaces. This allows any wastewater treatment plant to add aeration basin control measurements quickly and easily. Digital communications and advanced diagnostics simplify maintenance and commissioning and provide state-of-the-art condition monitoring. Primary savings come from controlling air flow. Aeration blowers can account for up to 70 percent of the energy usage of a wastewater treatment plant. In a typical process, microorganisms consume organic carbon as a nutrient — creating carbon dioxide, water and biomass — while dissolved oxygen is used to convert ammonium to nitrate, which is later broken down into its components. Oxygen is forced into the aeration basin with large blowers. Using blowers at full capacity when ammonia levels are low can be expensive and unnecessary.

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