Dredging & Solids Dewatering


Application Description

Solids dewatering and water treatment technologies associated with environmental remediation may take many forms. Typically hydraulically dredged, high water content sediments are treated with flocculants and dewatering aids to enhance the dewatering process. The resulting water treatment may include filtration technologies to remove contaminates from the aqueous phase. It may also include physical dewatering of contaminated sediments through a variety of processes. The dewatering may be accomplished through a belt filter press, geotextile tubes, or through enhanced sedimentation.


Solids dewatering and water treatment are often needed in sediment dredging applications. CETCO offers products to assist in the removal and treatment of water from contaminated sediments.

CETCO Provides

  • Organoclay® based filtration media may be used to treat contaminated water that is associated with sediment dewatering applications. Treatment using Organoclay subsequently reduces fouling in the activated carbon filter.
  • Accofloc™ Flocculant Aid improves flocculent formation and concentration in water treatment applications. When used with cationic or nonionic flocculent, Accofloc will also improve overall water quality by reducing turbidity, heavy metals, and TOC.
  • CETCO's Geosynthetic Clay Liners placed under geotextile tubes during the dewatering process function as excellent water collection pads.

Benefits of Utilizing CETCO's Technologies

  • CETCO flocculent aids are formulated to quickly cause high concentration flocculent formation.
  • By utilizing geotextile tubes, cost savings can be greatly increased as the dewatering occurs on-site, reducing the overall operational costs.
  • Filtering contaminated water with Organoclay®, prior to activated carbon, will remove many organic contaminates, thereby extending the life of the activated carbon.

Challenges that exist with traditional methods

  • Heterogeneity of solids require complex flocculent packages
  • Water release can be slow and inconsistent
  • Large dewatering applications can be expensive due to high operational costs
  • Activated carbon fouling from oil or NAPL applications


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