Dredge, Sludge & Lagoon Processing

Effective Treatment of Dredge, Sludge & Lagoons

Our process is used in the treatment of widely different and difficult waste streams, and is effective in recovering even the most difficult materials to allow their beneficial re-use. The process is able to achieve these results based on the expertise of our delivery team and the extensive research that has gone into the development of; the chemical formulations deployed, our materials handling procedures and mixing techniques. These are adapted to the needs of each particular site and waste stream being treated.  Reagents used in the technology fall into four broad categories:

  • Adsorptive reagents
  • Pozzolanic reagents
  • Modifying reagents
  • Redox reagents.

In many cases waste streams have high moisture content.  It is this high water content that generally categorizes the waste stream as sludge. Sludges may be:

  • Dredge material which has been removed from river beds, coastal waters, or estuaries
  • Wastes from industrial processes – such as Gas/Coking Works waste or waste from Steel manufacturing
  • Mud i.e. soils that are saturated due to excavation on sites exhibiting a high water table
  • Lagoons material, where waste has been stored in uncovered large pits that are open to the elements and hence rain water mixes with the contained wastes

Despite the different sources of the sludge material, they all exhibit excessive moisture content, posing considerable handling constraints.  Therefore, in all cases where we are treating sludge an adsorptive reagent or modifying reagent would be used to reduce moisture content, in conjunction with one or more additional reagents to remediate any contamination in the material.

Reagents maybe mixed in distinct stages or in a multi-step continuous process to create a dry inert product.  Then, following a curing period of 2 – 24 hours, the treated material is ready for reuse on site.

Where specific load bearing performance is required, the reagent formulation will be adjusted to meet project specific physical specifications usually measured in CBR or unconfined compressive strength.

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