Abstract: A coagulation-sedimentation apparatus is designed to enable the apparatus to treat water at a higher rate. The coagulation-sedimentation apparatus includes a separation tank body 60 divided into an upper chamber 61 and a lower chamber 62 by a partition member 64. The tank body has a raw water inlet pipe 66 that introduces raw water into the upper chamber, and a water distributing passage that introduces a part of the water from the upper chamber to the lower chamber. The upper chamber has a first treated water outlet 76, and the lower chamber has a second treated water outlet 78. The flow velocity of upward flow of the water toward the first treated water outlet 76 in the upper chamber and the flow velocity of upward flow of the water toward the second treated water outlet 78 in the lower chamber can be controlled so that flocs in the upward flows can settle.

Abstract: The present invention has an object to provide a compact aggregation precipitation method and an apparatus therefor which prevent the outflow of flocs and do not deteriorate the turbidity elimination performance even in start-up early stages. As the means to accomplish such an object, the present invention provides a method of adding an inorganic flocculant and, optionally, an organic polymer flocculent to the water to be treated and agitating the resulting mixture to effect aggregation precipitation treatment which comprises introducing the agitated solution into a first chamber of a separation tank where flocs are allowed to grow to effect solid-liquid separation and, simultaneously, the separated water is discharged out of the separation tank.

Abstract: The present invention provides a sewer system having a means to quickly disinfect rainwater-incorporated sewage and pollutant-incorporated rainwater, that is, combined sewer overflow (CSO), separated sewer rainwater overflow and separated sanitary sewer overflow before being discharged to public water body without passing through a sewage treatment plant, and a method and an apparatus for disinfecting rainwater-incorporated sewage and pollutant-incorporated rainwater.

Abstract: The present invention provides a sewer system having a means to quickly disinfect rainwater-incorporated sewage and pollutant-incorporated rainwater, that is, combined sewer overflow (CSO), separated sewer rainwater overflow and separated sanitary sewer overflow before being discharged to public water body without passing through a sewage treatment plant, and a method and an apparatus for disinfecting rainwater-incorporated sewage and pollutant-incorporated rainwater.

Abstract: The present invention has an object to provide a compact aggregation precipitation method and an apparatus therefor which prevent the outflow of flocs and do not deteriorate the turbidity elimination performance even in start-up early stages. As the means to accomplish such an object, the present invention provides a method of adding an inorganic flocculant and, optionally, an organic polymer flocculent to the water to be treated and agitating the resulting mixture to effect aggregation precipitation treatment which comprises introducing the agitated solution into a first chamber of a separation tank where flocs are allowed to grow to effect solid-liquid separation and, simultaneously, the separated water is discharged out of the separation tank.

Abstract: A solid-liquid separator including a separation tank, a treated water outlet (16) at the top of the tank, a sludge outlet (17) at the bottom of the tank, a draft tube (3) near the center in an upper inner zone of the tank and connected to a raw water inlet pipe (2), horizontally rotatable multistage stirring blades A (5) in the draft tube, horizontally rotatable multistage stirring blades B (6) immediately below the draft tube, a horizontal baffle (8) below the stirring blades B, a floating filter medium layer (10) around the outside of the draft tube above the stirring blades B, and a screen (12) fixed below the water level above the filter medium layer, and optionally, a filter medium-receiving screen (13) around the lower outside of the tube in combination with stirring rods (14) above the screen or aeration nozzles.

Abstract: An object of the present invention is to provide a compact solid-liquid separator having a high water surface loading which can limit pollutant's outflow even when flocs are insufficiently pelletized.