Method for the removal of nutriments containing carbon nitrogen and phosphorus

摘要

The process is of the type consisting in circulating the raw water to be treated in cells or biological filters containing immersed filter beds operating anaerobically and then aerobically or vice versa. According to the invention, a treatment module is employed comprising at least two cells or biological filters in series (for example an anaerobiotic biological filter and one to five aerobiotic biological filters) by alternating anaerobiotic and then aerobiotic phases cyclically, the entry of the stream to be treated always taking place into the anaerobiotic cell. Advantageously, each stage of the cycle is separated by a stage and calculated delay comprising a stoppage of the feeding of water to be treated.