The U.S. EPA report, Evaluation of Energy Conservation Measures for Wastewater Treatment Facilities, provides performance and cost/benefit information to encourage energy conservation measures (ECMs) at publicly owned treatment works. The report focuses on identifying and emerging ECMs, building on an extensive literature review of the effectiveness and costs of ECMs for municipal wastewater treatment.
One ECM featured in the report is the large-bubble mixing system, as opposed to coarse (smaller) bubbles. The large-bubble system uses compressed gas (air, nitrogen, methane) to intermittently and sequentially fire programmed short bursts of softball-sized bubbles from engineered, floor-mounted nozzles (Figure 1).
This energy-efficient mixing system can
