Location: Speedway, Indiana
Owner: Town of Speedway
Services Provided: Environmental Engineering
American Structurepoint led the design to rehabilitate this wastewater treatment facility. The $4.6 million improvements included upgrading the PSA oxygen generation system, improving efficiency of the oxygen transfer system in the biological tank, adding blanket detectors for the final clarifiers of the secondary process (UNOX), structural repairs to the biological control strategy, replacement of 50-year-old pipes and pumps that vibrate too much in the anaerobic digestion system, addition of a cake pump for the belt filter system, and addition of the storage nitrification denitrification reactor (SNDR) for the anaerobically digested nudge to reduce the ammonia concentration in the filtrate. The SNDR process will result in a more easily dewatered cake and requires less polymer to dewater. The savings in polymer and disposal alone yields a predicted return on investment of 14 years. The SNDR process removes ammonia from the recycle stream providing less ammonia for the biological process to convert to nitrate, thereby allowing the plant to reach compliance with the permit limits. The construction is scheduled to begin in early 2011 and be completed in early 2012.