| 摘要 |
The invention provides a method for wastewater treatment, in a flow-continuous system, and a plant for wastewater treatment, in particular for a requirement of high level reduction of biogenic nitrate compounds. The method for wastewater treatment, by means of subjecting wastewater to consecutive steps of removal of various forms of impurities included therein, as a result of which depletion of readily available and averagely available carbon occurs, and then subjecting a mixture of active sludge and wastewater to vacuum degassing in a tower (7) for vacuum degassing, consists on that the mixture of active sludge and wastewater subject to earlier nitrification, but not introduced in the recirculation-return connection (2), and constituting the outflow from a nitrification volume (3), before vacuum degassing thereof, is subject to additional denitrification within the volume (4). Preferably, to the mixture of active sludge and wastewater, free, due to the additional denitrification step, of substantially majority of any kind of hardly available carbon carried along with wastewater, any kind of external source of readily available carbon is introduced, and further deepened nitrates removal is performed within the volume (5), where thus initiated nitrates removal process, after wastewater is passed through the vacuum degassing step, continues within a gaseous nitrogen undersaturated aqueous zone of a secondary sedimentation tank (8). |
