Reducing The Footprint And Costs Of Effluent ReaerationSource: BlueInGreen
Engineers for Leprino Foods were recently charged with designing and building a new wastewater treatment facility in support of additional expansion in Greeley, Colorado. The design of the sequencing batch reactor facility, which also includes tertiary filtration and UV disinfection, was almost complete when the State of Colorado added a 6-mg/L dissolved oxygen
requirement to the proposed NPDES permit. With limited real estate at the planned facility and a desire to minimize capital and operating expenses, the engineers specified BlueInGreen’s SDOX technology to inject oxygen within the main process line just upstream of final sampling, measurement, and discharge.
For most municipalities and industries, treated wastewater being discharged to the environment must contain a minimal amount of dissolved oxygen by law. In the US, the level of
oxygen required in treated effluent is typically determined by the State on a case by case by basis – depending on location, receiving stream, aquatic life needs, and various other criteria.
Often times, the dissolved oxygen concentrations required represent a significant investment in capital equipment such as blowers and diffusers, as well as infrastructure such as concrete basins and buildings. Additionally, as effluent DO requirements approach saturation values, conventional aeration technologies become more and more inefficient requiring the movement of large volumes of air for only slight increases in DO concentrations. This ultimately means significant capital and operating expenses are associated with post treatment reaeration projects where elevated DO levels are required.