Angola, IN Wastewater Treatment Plant

The Angola Wastewater Treatment Plant is a Class III facility designed for an average daily flow of 1.7 MGD. The plant utilizes conventional activated sludge – removing more than 95% of the biochemical oxygen demand, total suspended solids, and ammonia.  The plant process train also utilizes flow equalization, screening, grit removal, primary clarification, secondary aeration, and UV disinfection before discharging effluent to the H. D. Wood Ditch. This ditch eventually flows into the Pigeon Creek which in turn flows into Long Lake and eventually into the St. Joseph River.  Since the St. Joseph River flows into Lake Michigan, the City of Angola is under the jurisdiction of the Great Lakes Initiative and must therefore maintain effluent limits of Total Phosphorus below 1.0 mg/L.

The WSI conducted audit conducted in 2010 followed a traditional energy audit sponsored by Region V EPA. The EPA sponsored audit resulted in a retrofit that included a new Turblex blower.  WSI was jointly contracted by the EPA and the City of Angola to do a follow-up audit that took a different approach than the previous audit.  The WSI process energy audit identified additional energy savings with a potential of up to 63% additional electrical savings.  As implementation of recommendations unfolds, the actual additional electrical savings is anticipated to exceed 35%.

WSI’s process angle to energy audits is extremely powerful. LouAnn Unger, USEPA Region V Water Division