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Sludge Dewatering Tubes

Sludge Removal and the dewatering options Dredging is by far the most common form of sludge removal followed by other methods that involve mechanical removal from a tailings dam. The sludge is removed, dried, and transported to a landfill or a land-application facility. Dredging, however, can be......

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Sludge Removal and the dewatering options

Dredging is by far the most common form of sludge removal followed by other methods that involve mechanical removal from a tailings dam. The sludge is removed, dried, and transported to a landfill or a land-application facility. Dredging, however, can be an extremely difficult, time-consuming, and costly process. Dredging can also damage a lining system, which can compromise the structural integrity of the sludge pond and lead to seepage.

Mechanical Properties

Test method

Minimum Average (English)

Minimum Average(Metric)

Mass/Unit

ASTM D-5261

3.1 oz/yd²

105 g/m²

Grab Tensile Strength (MD x CD)

ASTM D-4632

80 x 80 Ibs

356 x 356 N

Grab Tensile Elongation

ASTM D-4632

50 x 50%

50 x 50%

Trapezoidal Tear

ASTM D-4533

30 x 30 Ibs

134 x 134 N

CBR Puncture

ASTM D-6241

175 Ibs

79 N

Apparent Opening Size(AOS)

ASTM D-4751

50 US Std.Sieve

0.3 mm

Permittivity

ASTM D-4491

2.1 sec-1

2.1 sec-1

Water Flow Rate

ASTM D-4491

155 gal/min/ft²

6315 L/min/m²

UV Resistance (% retained after 500 hours)

ASTM D-4355

70%

70%

For the South African projects described here, limited budget and time-sensitive operational upgrade windows for desludging the wastewater ponds pressured the project teams to find alternative methods. On-site geotextile dewatering bags were found to be a more economical and smaller footprint solution.

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