City of Decatur

 

Wastewater Treatment Plant Improvements Project
*ACEC Merit Award Winner*

Client:
City of Decatur
225 W. Monroe Street
Decatur, IN  46733
(260) 724-7171

Project Description:
The City was operating Anaerobic Digestion facilities constructed in the 1950's which were upgraded in the 1980's. In 2007, Commonwealth Engineers, Inc. (CEI) completed a detailed planning report which identified cost effective options to implement state of the art technologies to update the Wastewater Treatment Facilities and Biosolids treatment process. As a result of this study, the City elected to modify the existing biosolids treatment structures to incorporate a new Class A Biosolids treatment process. The plan called for blending dewatered Class A Biosolids with the existing City compost material from yard wastes and eliminating disposal of the Biosolids to local landfills. The primary and secondary treatment trains were also expanded increasing the design capacity to 3.25 MGD and peak flow to 7.0 MGD. The Class A process utilized is the AutoThermal Thermophilic Aerobic Digestion (ATAD) to process 3300 lbs/day of solids.

The design began in July of 2007 and was completed in February of 2008. The construction of the new facilities began in July 2008 and was complete in July of 2009. Commonwealth provided all engineering services including construction administration, inspection and plant start-up services.