IAI performs treatability studies on materials in order to select the most efficient means and methods for dewatering a particular material. One such test is a Geotube® Dewatering Test or GDT.
A GDT involves pouring sediment (or other material to be dewatered) into a small scale geotextile tube. The flow rate, turbidity and suspended solids content of the water passing through the geotextile fabric (weep water) is evaluated. Geotube® Dewatering Tests are performed according to the manufacturer’s proposed ASTM standard procedure.
Other treatability tests performed by IAI include:
- Percent solids and grain size analysis of the in-situ material
- Jar testing to select a chemical flocculant (polymer) and a target dose
- Weep water turbidity and suspended solids analysis
- Dewatered material percent solids after 24 hours in the geotextile tube
- Paint filter and unconfined compressive strength tests on the dewatered material
- Performance and target dose of soil amendments
- Performance and target dose of chemical flocculants for water treatment (post sediment dewatering)
- Performance of water treatment processes
Treatability test results are evaluated, along with our past project experience, and used to develop project design recommendations for our clients.
- Sediment, as collected from a river
- Surface water, collected from same river
- Diluting sediment to simulate hydraulic dredge slurry
- Treating sediment slurry with polymer
- Sediment slurry and polymer mixture
- Rapid Dewatering Test
- Treating sediment slurry with polymer for GDT
- Filling the GDT
- Filling the GDT, closer view
- Jar testing flocculants in the GDT weep water
- Laboratory scale multi-media filter