FIELD: treatment plants.
SUBSTANCE: invention relates to water treatment. Biological waste water treatment is performed in a plant comprising receiving chamber 1, aeration tank 11 and reservoir 15 serving as the aerobic sludge stabilizer. Receiving chamber 1 is equipped with aerator 3, float switches 4 and 5, main pump for liquid pumping from receiving chamber 1 into aeration tank 11. Aeration tank 11 is equipped with aerator 12 and secondary settler 14 in the form of a reservoir with slope walls for collection of deposited sludge in a cone-shaped bottom part from the liquid. At actuation of float switch 4 with its location at the upper level of the liquid mark in receiving chamber 1 the first compressor is switched on and the second compressor is switched off. At actuation of float switch 4 with its location on the lower level of the liquid mark in receiving chamber 1 the second compressor is switched on and the first compressor is switched off. At termination of air supply into aeration tank 11 via aerator 12 from the first compressor the sludge is pumped over from aeration tank 11 into reservoir 15 equipped with aerator 16 connected with the first compressor. At lowering the level of waste water in receiving chamber 1 below the minimum level the nitrified waste water is pumped over into receiving chamber 1 from reservoir 15. Purified liquid is drained through outlet 13.
EFFECT: invention improves quality of treating waste water.
1 cl, 2 dwg
