ENERGY OPTIMIZATION IN AN ANAEROBIC, FACULTATIVE, ANOXIC AEROBIC PLANT, USING FINE BUBBLES, WITHOUT SLUDGE PRODUCTION

摘要

System for treating waste water with intermittent aeration and low energy consumption, which comprises: a pump sump or a sump controlled by a PLC in order to achieve control of pumping, level and flow of liquid; the liquid is pumped to the aerobic treatment device or to the UASB device, which aerobic treatment comprises an air diffusion unit or fine-bubble diffusers (1) operating intermittently and diagonally, there being a high density of diffusers in the aerobic zone, where it would be an option for said region to be deeper than the other zones, an agitator (8), not only the agitator but also the blower being controlled on the basis of time using a PLC, the agitator then operating after the diffusers have stopped, and also energy is applied to prevent sedimentation of sludges inside the aeration tank. Next, the water passes to a sedimentation tank (3) which separates the liquid from the sludge and conveys the excess sludge to the UASB anaerobic sludge digestion device, using a further electrovalve (10); the UASB has a chamber for the accumulation of biogas, which may be burnt off, the burning system being controlled by the PLC, and in said part there is also a sedimentation unit that separates the anaerobic sludges from the liquid obtained. The sludge-free liquid is separated by the sedimentation unit (3), said sedimentation unit having, in the upper part, a channel with scum screens, which enables said liquid to be scum-free and sludge-free, and same is transferred to a disinfection chamber (15) designed to offer the disinfectant a residence time, the disinfectant being provided by means of a metering pump and controlled by means of the PLC, and there may optionally be a transducer for controlling the disinfectant concentration.