Once the tube is filled and allowed to drain completely, the contained material is dry enough to be handled with an excavator for easy disposal or re-use. The filter cake enhances filtration efficiency, allowing clear filtrate to percolate through the geotextile. The agglomerated sludge particles settle inside the tube, allowing for the formation of a filter cake on the surface of the geotextile. Flocculant is injected in-line, downstream from the dredger. Flocculant addition is commonly required for the dewatering of bio-solids. For this specific project, a flocculant was required in order to agglomerate the solids, enabling efficiently settling and dewatering within the tubes. Sediment or sludge is dredged from the pond and fed to the geotextile dewatering tubes. Geotextile dewatering tubes can be used to efficiently and cost-effectively dewater the dredged sludge Desludging at wastewater treatment works are typically done using an auger suction dredge, which enables dredging whilst the pond remains in operation. Desludging of these wastewater ponds are required in order to regain dam capacity. This would typically lead to drying beds becoming overloaded or waste stabilisation ponds silting up with sludge. When rapid urbanisation or development occurs in a specific area one would commonly find that the incoming feed load exceeds the production capacity of the area’s wastewater treatment plant. Extruded strands are tested before weaving for tensile strength and, once woven, each roll of geotextile is tested for tensile strength and permeability. We cater for both large and small projects and our ease of deployment means ZebraTube® is ideal for emergency dewatering projects.Įach roll of geotextile goes through a comprehensive set of tests at our factory to ensure absolute quality and traceability. Our complete control over the manufacturing process allows for design flexibility and speed of delivery. Our geotextiles are produced and woven locally by experienced weavers and thereafter converted to dewatering bags. ZebraTube® products are designed and manufactured in South Africa. We have more than two decades of experience in retaining solids and percolating liquids through our woven geotextile bags. ZebraTube® has its origins in the manufacturing of large dewatering bags for the deepest mines in the world.
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