When a conventional activated sludge wastewater treatment facility has reached its limit, the SUBRE submerged membrane aerated biofilm reactor from Fluence can be a solution. The system is used to retrofit existing aerobic wastewater treatment plants to increase capacity without enlarging a plant’s footprint. It helps improve effluent quality to meet EPA standards for reuse and uses up to 90 percent less energy than alternatives, allowing plants to progress toward energy neutral treatment. 763-746-8400; www.fluencecorp.com; Booth 4415.