The City of Greenfield, Indiana was removed from the CSO community list as a result of the construction of the new 12 MGD Ballasted High Rate Clarification (BHRC) process in 2004 and several sewer rehabilitation and lateral replacement projects. The cost associated with the new BHRC
processwas approximately 2.0 million and was part of an 8.4 million plant expansion project. This is the first facility of its kind in Indiana. During wet weather events flow is diverted to the BHRC process following screening and grit removal while the remainder is sent through primary and
secondary treatment. The flow streams are recombined prior to UV disinfection and consistently meet the City's NPDES limits of 10 mg/l CBOD and 12 mg/l TSS. The process is designed to reach full treatment efficiency within 15 minutes from start-up. Average removal rates are 78% for CBOD, 88%
for TSS and 25% for Ammonia-N. Operating costs are approximately 190.00 per milliongallons treated or 39.00 per hour of operation.
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