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  • Pump and Treat

    Introduction/principles

    The majority of contaminated sites in the UK contain impacted groundwater that requires treatment during remedial works. Groundwater can be abstracted from open excavations, boreholes, trenches, eductor and ejector wells, or even cut off trenches and pumped to a water treatment facility where contaminants are removed from the water. Clean water can then either be discharged to a trade effluent sewer, recycled for use on site such as dust suppression or re-injected back into the site with appropriate approvals.

  • Soil Washing

    Introduction/principles

    Soil washing or soil scrubbing is a water based process for remediation of excavated soils. Soil washing removes contaminants from soils two ways:

    1. By dissolving and/or separating, suspending contaminants on soil particles into the wash water, wash water can be dosed with chemicals to improve the washing characteristic (such as pH adjustment, surfactants, etc),

    2. By concentrating contaminants into a smaller volume of soil through particle size separation and attrition scrubbing.

  • Stabilisation and Solidification

    Introduction/principles

    Stabilisation and solidification (S/S) is a remediation technology that relies on the physico-chemical reaction between a reagent and a soil to reduce the mobility of any contaminants present. This immobilisation is achieved by the chemical interaction of contaminants with the added reagents, (i.e., through sorption, precipitation or incorporation into crystal lattices) and/or the physical encapsulation of the contaminants, specifically:

  • Thermal Desorption

    Introduction/principles

    Thermal desorption is a physical separation process, contaminated soils are heated to volatilise water and organic contaminants. A carrier gas or vacuum system transports volatilised water and organics to the gas treatment system. There are generally three methods of thermal desorption:

  • Virtual Gas Curtain

    Introduction / principles

    The virtual curtain wall system comprises vent nodes connected together to form a venting system. The basis of this system is the utilisation of the forced dilution principle to create a zone of low pressure that attracts and dilutes ground borne gases to acceptable levels and provide an appropriate pathway break.

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