PROCEDE DE REPARTITION DE ROSEAUX DANS UN BASSIN D'EPURATION DES EAUX ET DISPOSITIF POUR SA MISE EN OEUVRE

摘要

The method for transplanting reeds in a sewage treatment pool divided into treatment zones (Z1, Z2, Z3, Z4) and whose bottom contains a treatment bed consisting of etching layers in which the reeds are transplanted, is claimed. The supply of sewage sludge is provided by nozzles (12) spaced apart from one another. Each nozzle is associated with one treatment zone in which a packing density of reeds per unit area is 1/m 2>and decreases from the nozzle. In each treatment zone, implantation points (K) of the reeds are divided into staggered rows on concentric circles (C1, C2, C3, C4, C5). The method for transplanting reeds in a sewage treatment pool divided into treatment zones (Z1, Z2, Z3, Z4) and whose bottom contains a treatment bed consisting of etching layers in which the reeds are transplanted, is claimed. The supply of sewage sludge is provided by nozzles (12) spaced apart from one another. Each nozzle is associated with one treatment zone in which a packing density of reeds per unit area is 1/m 2>and decreases from the nozzle. In each treatment zone, implantation points (K) of the reeds are divided into staggered rows on concentric circles (C1, C2, C3, C4, C5) centered on the vertical axis of the supply nozzle, where pitch P between circles is increasing from the center towards outwards. The radius of the circle Rn is expressed as Rn=R1+D[n(n-1)/(Ct-1)], where R1 is radius of the inner circle, n is the number of a circle from the center of the supply zone, Ct is the total number of circles assigned to the treatment zone calculated by dividing the total surface of the treatment zone by an average number of reeds, and D is equal to [(L/2-L/a)-R1]in which L is width of the pool and a is the distance between an edge of the treatment zone and the closest circle. A mold of each transplanted seed is mixed to an inert absorbent material such as vermiculite retaining moisture in a ratio of 5-15 wt.%. An independent claim is included for a device for positioning points for transplanting reeds in a sewage treatment bed.