Continuous batch reactor (SBR) -Maximization of nitrogen and phosphorus removal efficiency through sludge return and semi-permanent carrier -Technology resistant to shock loads with intermittent inflow method -No sedimentation tank is required, so the site area is reduced and construction cost is reduced. -Reduction of power consumption by more than 25%, lowest maintenance cost during water treatment process [Application field] Applicable to various water treatment fields from small and medium-sized wastewater to high-concentration wastewater