Drainage and filtration of the sludge of the pond in order to
– Increase water removal from sludge,
– Limit the water consumption,
– Limit the covered area of storage pond,
– Limit the impact of water fluctuations on slopes by avoiding soil erosion.
OCP (Chérifien Phospates Office) is an operator of phos-phate mines in Khourigba. The enrichment of phosphates in the MEA laundromat leads each day to the production of 24,000 m3 of washing and flotation sludge. This sludge contains between 70 and 80% of water, 80 to 85% of this water is recovered from the decanters and the remainder is evac-uated as thickened sludge to ponds. OCP wanted to cover the traditional pond with a solution to increase the water removal from sludge and pre-serving the slopes of ponds from the soil erosion. This request also comes within the framework of the COP 22 which took place in Morocco in 2016.
AFITEX, with its strong experience on the drainage system, the DRAIN-TUBE geocomposite, chemically inert and that a filtration layer to collect a clean water at the end of the collector pipes with a suspended partic-ulate matter <1% required for a reuse of this water in the phosphate extraction.
The Draintube 450 FT1 D20 is an association of 2 needle-punched geotextiles (one filter and one drainage layer) with a mini-drain network. The filter layer is designed to ensure a filtration without clogging by the sludge.
Components are bonded by needle-punching. This process is hydraulic friendly and do not damage the filtration layer characteristic.Product can be peeled in order to separate the filter layer so as to make easier the product over lap, ensuring filtration layer continuity.
Project management and contractor: OCP – Morroco
Area: 6 300 sqm Date: 2015
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