Fort Myers WRF Life Cycle Carbon Footprint Evaluation

Carbon Footpring
AnoxKaldnes™ MBBR

The Analysis

Black & Veatch Corporation (B&V) worked with the City of Fort Myers to assess carbon footprint within their technology evaluation for a new wastewater treatment facility, East Water Reclamation Facility (WRF). "The treatment alternatives considered in the assessment were: conventional activated sludge (two separate configurations), membrane bioreactors (MBR), moving bed bioreactors (MBBR) designed for both nitrification and denitrification, and MBBRs designed only for carbonaceous BOD removal."

"There were a number of competing issues that mandated that process selection be based on a "triple bottom line" sustainability assessment that considered critical factors under the three categories of social, environmental, and economic. The new East WRF is sited adjacent to a high end development in Fort Myers so providing a neighbor friendly facility was a top priority for the City. Effluent from the new East WRF will be disposed of through reuse irrigation and deepwell injection both of which do not require nitrification, denitrification or phosphorus removal, so the treatment requirements are much more relaxed than required for surface water discharge in Florida."

Evaluation Results

"The carbon footprint analysis was conducted considering both the embodied carbon for the construction and implementation of the alternatives as well as the operational equivalent CO2 emissions for power, methane (CH4) and N2O."1 "The carbonaceous BOD removal MBBR alternative was found to have the most favorable life cycle carbon footprint."1 Refer to Figure 1.

"The benefit scores" of each of alternatives, along with the contributions from each of the main triple bottom line criteria...indicated that the carbonaceous BOD removal MBBR alternative was the most favorable option."1 Refer to Figure 2.

¹Steichen, M., Kadava, A., Shaw, A., Scanlan, P., Martin, M., Kazemi, S. (2009). Proceeding from FL WRC'09: Carbon Footprinting of Wastewater Treatment Technologies. City, FL.

Pilot Study

Kruger was commissioned to conduct a pilot study of the AnoxKaldnes MBBR process at the Central Advanced Wastewater Treatment Facility in Fort Myers, FL. The pilot study was conducted over 6 months, from January to June 2009. The pilot study verified that the AnoxKaldnes MBBR process was capable of meeting the target effluent requirements.