Bonita Springs RO Energy Optimization Project: An Integrated Membrane, Energy Recovery and Control Approach to Saving Power Cost

The paper compared several energy recovery devices (ERD) for Bonita Springs Utilities membrane element, and membrane train expansion combinations. The analysis resulted in a membrane element specification that considered not only purchase cost, but also life-cycle cost when operating with the new ERD at current and potential future feed water quality and train capacity. The existing treatment facility including wellfield, membrane feed pumps, and RO system were modeled to better understand how proposed ERD and membrane choices, along with expansion options and control system changes would impact overall treatment facility energy consumption This paper describes the comprehensive evaluation process and how a life-cycle cost evaluation approach was used to select a replacement membrane and energy recovery device that would maximize annual energy savings over the anticipated life of the membrane elements.