A method for the biological water purification, in installations for farm or - posture

摘要

A method for the biological water purification in closed recycled facilities for farm or - by means of removal of the in the water accumulated nitrogen-containing compounds and other nutrients by means of aerobic assimilation in submerged culture and separation of the resulting excess biomass,with an organic carbon - and energy source, a sufficient amount of oxygen and rapidly growing chemoorganotrophic microorganisms in the entire process water are present, in which, however, in the entire process water is present any carrier material,characterized by,that the recirculated process water in the initial phase of the fish posture with bacterial strains from a bacilli - mixed population, the nitrogen compounds can be particularly well assimilate and a broad utilization spectrum with respect to carbon sources have, in an initial concentration of approximately 10⁶ Cfu / ml is inoculated, wherein the bacterial strains which are without exception, the aerobic tracks image are to be assigned to the genus bacillus and as a heat resistant spores in the form of biological sludge with a shelf life of approximately one year can be called up and can be stored are,that the concentrations of freely movable bacterial cells in the respective circle running waters in the average in the case of 10⁶ to 10⁷ Cfu / ml and in the phases in front of the biomass removal to about 10⁸ Cfu / ml of rise,that the process water temperature in the range between 18 and 26°C,that in this temperature range of the oxygen saturation degree 80%, and by means of air introduction of 35 l / min is reached,in that for the degradation of nitrogen compounds, starch, glucose, sucrose and / or ethyl acetate - and / or citric acid as organic acids or salts thereof, and, as carbon - and energy sources are added,that the ammonium concentration in the process water is stabilized at a low value, namely less than 1,0 mg / l, and that the ph - value is stable in the neutral range,that the nitrification and the associated release of nitrite and nitrate is prevented,that 4. day daily 25 – 30% of the biomass be removed,and that the separation of the sludge takes place by means of screening methods.