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Contaminated Dredging Material Processing

The Material

Dredging involves the excavation of sediment from the bed of a harbour, river, lake or other body of water. It occurs for a variety of reasons, including maintenance, preparatory work for construction, flood prevention or removing rubbish from the water bed. Dredged material is often contaminated with heavy metals, oils and chemicals as a result of actions in the past, such as shipbuilding and naval activities.

This material, if even accepted at a landfill, would be too prohibitively expensive to dispose of, due to its composition and weight.

The Benefits

CDEnviro solutions can process and treat contaminated dredging material to avoid landfill costs and create products like sand and stone for re-use.

Our tailored solutions receive dredgings which has the consistency of a solid/liquid sludge. The first important step in the process is the dewatering of the material to make it easier to process. Without dewatering, it is highly unlikely that this material would be accepted at any landfill site. 

The process of recycling and recovery then involves processing to produce sand, stone and organics as independent revenue streams. 

The final clay content contains the contaminants and is further dewatered to ensure easy and cheap disposal of this material. Organics can also go to landfill, or on for further treatment. The recovered excess water typically goes through a tertiary treatment process and can be returned to the original water channel.

The reusable materials produced from the process are of a high quality and there are options for many reuse markets. There are also opportunities for using this material for landscaping and bedding.

Further processing can remove heavy metal and hydrocarbon constituents from the waste water stream. This enables a wider range of more difficult, more lucrative waste streams to be processed.

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