Abstract: A portable re-breathing apparatus is proposed. the portable re-breathing apparatus includes a mask configured to be worn on face of a user to correspond to mouth thereof and connected to a main hose through which air flows, a first oxygen mixing part connected to the main hose and through which exhalation flows, a second oxygen mixing part (200) configured to remove carbon dioxide (CO2) in the exhalation and to provide oxygen to the mask through the main hose, an air movement part connecting the first oxygen mixing part to the second oxygen mixing part (200), an oxygen supply unit including an oxygen container compress-storing oxygen and configured to supply oxygen to the second oxygen mixing part (200), and a controller (500) connected to the first and second oxygen mixing parts and the oxygen supply unit and configured to regulate CO2 and oxygen density to allow the user to breath.

Abstract: The present invention relates to a high speed coagulant-flocculant and sedimentation method for treating waste water, which permits a speedy treatment of waste water including stormwater runoff and also permits a valuable reuse of the sludge produced in the course of treatment.