A diaphragm-wall bentonite programme is a continuous process: prepare clean slurry, support the excavation, receive contaminated slurry, separate solids, test, reuse or replace.

Preparation

Check make-up water, condition only where justified, disperse ALKABEN under effective mixing and allow qualified hydration before testing.

Working contamination

Track density, Marsh and sand through excavation. High sand identifies coarse material; high density after sand removal shows fine solids remain.

Treatment plant

Screens and hydrocyclones address larger particles; desilters extend toward finer sizes. In projects generating large quantities of very fine material, centrifugation or replacement can become more economic.

Reuse

Reuse by measured quality, not panel count. A reused fluid may be suitable for further excavation but still require further cleaning or exchange before concrete.

Replacement

Stop reprocessing when density/viscosity no longer improve meaningfully or recovery costs exceed fresh-slurry replacement. Keep clean, working, dirty and reject streams separate where possible.