A majority of the mixers have reached the end of their useful service life and are in need of replacement and/ or significant repairs.  The students will review the aeration system at both ONS facilities and evaluate different aeration technology options that may be viable at current wastewater industry.  This evaluation will include construction feasibility, estimated capital costs, estimated service life, maintenance accessibility, process control strategy and overall energy efficiency.  A present worth analysis is to be conducted for each alternative.    

UPDATE
The goal of our project is to assess and the explore the possibilities of modification to the oxygen nitrification systems (ONS) at the Belmont and Southport wastewater treatment plants in Indianapolis, Indiana. After our visit of the plants, we have concluded the need for an updated mixing system due to the fact that the current mixers do not efficiently remove nitrogen, as their previous system used pure oxygen rather than air. Moreover, replacement of the ammonia and DO probes would increase process control over the system. Currently, they employ numerous surface mixers in the ONS tanks at both sites. Our leading design proposal includes the implementation of a pulse mixer to replace the surface mixers. This proposed modification will provide better efficiency and nitrogen removal while still remaining cost efficient according to our financial analysis.