PROCESS FOR TREATING WATER IN A TREATMENT PLANT AND CORRESPONDING TREATMENT PLANT

摘要

The process according to the invention for treating water (3) in a treatment plant (1) comprising a reaction chamber (2) in which a biodegradable material present in the water (3) is biodegraded at least partly by microorganisms, in the course of which, at least temporarily, water (3) is transferred out of the reaction chamber (2) into a separating chamber (4) and the biodegradable material and the microorganisms are separated at least partly from the water (3) therein, a return stream comprising biodegradable material and at least some of the microorganisms flowing out of the separating chamber (4) into the reaction chamber (2) via a recycle line (8), is characterized in that at least some o f the following substances: a) the biodegradable material and b) the microorganism s are treated with ozone (O3), an amount of 15 to 150 milligrams of ozone per kilogram of dry substance of the biodegradable material and of the microorganisms bei ng added per hour in the reaction chamber (2). The inventive treatment plant (1) and the process according to the invention for treating water (3) advantageously allow the degradation of biological materi al and especially also, in a selective manner, of filamentous bacteria, which can b e converted only inadequately with processes known from the prior art. The inventive treatment plant (1) allows exact control of what amounts of biologically active or biodegradable material are treated with ozone, since the treatment of part-streams of the return stream, in a positive manner, makes it possible t o exactly determine what amount of biodegradable material is treated with what amount of ozone.