TenCate Geosynthetics Netherlands bv

Three New Tests Allow Accurate Assessment Of Geotube Dewatering Technology - Case Study


Courtesy of TenCate Geosynthetics Netherlands bv

Bench-scale and field-scale tests provide information about dewatering efficiency, flow rates, and chemical conditioning choices.

Careful analysis of dewatering methods is required before attempting large-scale dewatering projects, and TenCate's Geotube2 has developed three, new small-scale tests designed to provide accurate information about how its dewatering technology will work in full application.

TenCate develops and produces materials that function to increase performance, reduce cost, and deliver measurable results by working with our customers to provide advanced solutions.

The new bench- and field-scale testing procedures simplify evaluation of Geotube® dewatering technology, and can provide detailed information about the process. The bench-scale tests provide an almost-instant assessment of how a particular material will dewater with Geotubes dewatering technology. The field-scale test produces a more specific analysis, with accurate estimates of flow rates and overall project efficiency.

'These new tests are updates of older tests, such as the Hanging Bag test,' said Mark Gunzenhauser, Vice President of Industrial Fabrics for TenCate. 'We have been able to simplify our testing methods and make them more accurate.'

The three tests are called:

  • The Geotubes Dewatering Test IGDT)
  • The Rapid Dewatering Test (RDT)
  • The Cone Test

The Geotube Dewatering Test (GDT) is the field-scale evaluation. It uses a small bag (made from Geotube2 GT 500 fabric) designed to hold one cubic foot of material. The bag is placed on a simple, inexpensive PVC frame with a container to catch drainage underneath.

A stand pipe is attached to a connection on top of the bag. The bag is then filled with sludge, and dewatering is timed. The stand pipe allows water pressure assessment during the process. The test can be completed in less than one hour. Because of its simplicity and repeatability, the GDT is particularly useful for evaluating different chemical conditioning applications that can improve the dewatering efficiency.

After the test is completed, the bag can be cut open and the dewatered sludge analyzed to determine percent solids. Effluent quality can be assessed, and the GDT results have also proven to be very accurate in predicting how Geotube2 dewatering technology works in full-scale operations.

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