| 摘要 |
<p>Process for reducing contamination dissolved in a liquid according to which the liquid to be treated is circulated upwards in a biological purification device, this liquid, to which a carbon- containing compound and a phosphorus-containing compound have been added, passing upwards through a bed of granular material (1) supporting microorganisms, this granular material (1) being removed from the base of the said bed (9) to be directed towards a cleaning circuit (10, 11, 12) situated above the said bed (9), the cleaned granular material then being recycled to the upper part of the said bed, the soiled cleaning liquid being removed. <IMAGE></p> |
