Optimal extraction of purified wastewater from treatment plants with sequencing batch reactors is accomplished by displacement from below

摘要

Purified waste water from the activated sludge sedimentation phase, is introduced into a reactor. Here, it is subjected to displacement from below, being led off as clarified water. An independent claim is included for the plant carrying out the method. The SBR reactor is constructed as a compact tank. It includes an overflow channel (5) at the top, with an immersed wall (7) and toothed overflow weir (4). A central upright cylinder (2) is used to introduce water for treatment; it also distributes this influx. At its lower outlet there is a flow redistribution baffle (3), of predetermined size. A horizontal supply line entering the reactor tank is turned up at its end, to discharge centrally into the supply cylinder. It terminates at about the height of the immersed wall (7). The toothed threshold includes a valve (8). This is used to further lower the level in the tank, having initially led off some of the purified water. Preferred features: Each time a fresh purification cycle is started, the volume of water introduced for treatment on filling, equals that displaced.