Ash Remediation Management offer capability for groundwater treatment systems in-situ (permeable reactive barriers / PRB and chemical oxidation) and above ground (pump and treat systems). The systems can be designed to deal with a wide range of water borne contaminants including heavy metals, ammonium and TPH related compounds e.g. PAH and BTEX. The treatment systems could also be considered for effluent or waste waters found in non contaminated land related sectors.
The in-situ permeable reactive barrier / PRB methods are based on the installation of passive and permeable reactive barrier systems. Permeable reactive barriers / PRB are designed to intercept and immobilise water borne contaminants at the periphery of the targeted sites to control and mitigate the impact on offsite receptors.
Reactive additives tailored and designed to the individual need are used within the permeable reactive barrier / PRB systems to deal with ongoing pollution risks. These PRB systems are installed using rotary soil mixing rigs that homogenise the soil with the additives whilst creating minimal spoil.
Chemical Oxidation is another in-situ approach to groundwater remediation. The chemical oxidation treatment method is applied through a grid of small diameter injection wells that are installed across the site. A contaminant specific oxidising reagent is injected under pressure which facilitates the rapid and complete chemical destruction of a wide range of toxic organic compounds.
The benefits of in-situ chemical oxidation include rapid and extensive reactions with various contaminants as well as the degradation of many bio-recalcitrant organics. Furthermore, chemical oxidation remediation schemes are generally completed within short timeframes and due to the non invasive application site disruption is minimised.
Additional groundwater treatment methods are based on pump and treat systems primarily designed for dealing with hydrocarbon e.g. TPH and BTEX contaminated waters encountered during excavations as well as those present as a result of oil spills. These systems are normally considered to be of temporary nature and can be designed to separate and recycle oils in combination with the treatment of water to allow discharge under permitted conditions.