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Envirotreat ReDOC - E-Clay Products for Waste Pre-Treatment
ReDOC is a suite of advanced E-Clay products developed for the pre-treatment of waste streams, particularly soils, before they are sent to landfills. These products are specifically engineered to handle wastes with high levels of leachable Dissolved Organic Carbon (DOC), aiming to meet Waste Acceptance Criteria (WAC) necessary for disposal in stable, non-reactive, or hazardous waste landfills. Dissolved Organic Carbon represents all covalently bonded carbon atoms in organic molecules that can pass through a special 0.45 µm filter. The wide variability in DOC, due to its dependency on pH and other pollutants, poses a challenge in waste treatment. For example, poly-aromatic hydrocarbons (PAHs) exhibit increased leachability in alkaline conditions. ReDOC products leverage proven E-Clay stabilization technology to address this issue without resorting to cementitious materials, thus avoiding potential drawbacks and ensuring compliance with WAC requirements. This approach provides an effective solution for reducing DOC levels in waste prior to landfill disposal.
ReDOC is a range of advanced E-Clay products suitable for application to the pre-treatment of waste streams, including soils, prior to landfill. The product range was originally developed to treat complex wastes with high leachable Dissolved Organic Carbon (DOC) content in order to meet Waste Acceptance Criteria (WAC) for disposal to stable non-reactive and / or hazardous waste landfill.
Dissolved Organic Carbon may be defined as a classification for all carbon atoms covalently bonded in organic molecules that passes through a conventional 0.45 µm pore-diameter filter. It is non-specific in terms of the pollutant nature and will also include naturally occurring organic material such as humic acids not typically regarded as pollutants. The DOC composition of wastes is therefore infinitely variable in terms of organic content. Leachability of DOC will vary with respect to pH conditions and association with other pollutants. For example the leaching of poly-aromatic hydrocarbons (PAH) is widely reported to increase strongly towards alkaline pH, leading to increased solubility of DOC at high pH range.
ReDOC E-Clays are produced using existing E-Clay chemical stabilisation technology which has proven track record for the treatment of organic pollutants. Optimum E-Clay formulations were developed for the treatment of DOC, taking into consideration wide variance in polarity of organic pollutants and humic acids content of envisaged waste streams, producing the ReDOC range.
Traditional stabilisation/solidification techniques employed for the pre-treatment of wastes to landfill typically incorporate cementitious materials as part of the treatment process. ReDOC E-Clays have been designed to treat wastes without the use of cementitious materials thus eliminating the negative effects associated with cementitious materials and leachable DOC at high pH range.
The ReDOC E-Clay product range offers a treatment solution of waste with focus on reducing DOC content in order for the waste to become WAC compliant allowing disposal to stable non-reactive and /or hazardous waste landfill.