The treatment of
solidification/stabilization
"s/s" is the treatment of environmentally-harmful; wastes for
disposal, reuse and/or site storage of land on contaminated. It is the S/S treatment involves harmful
materials mixing a binding reagent into the contaminated materials or waste.
Although the terms solidification and stabilization sounds close-meaning by
hearing, they describe different effects that the binding reagents create to
immobilize hazardous constituents. Solidification refers to making a change in the physical properties of a waste.
The result- desired changes usually include an increase of the compressive
strength, a decrease of permeability, and encapsulation of hazardous
constituents.
Stabilization at the other end, refers to chemical changes of the hazardous constituents in a waste. The desired-goal changes include converting the constituents into a less soluble, mobile, or toxic form by adding additional materials. S/S treatment involves mixing a jointed reagent into the contaminated media or waste. Binding reagents commonly used include cement, cement kiln dust (CKD), lime, lime kiln dust (LKD), limestone, fly ash, slag, gypsum and phosphate mixtures, and a various-kind number of proprietary reagents. Due to the great variation of waste constituents and media, a mixing material, design should be conducted on each type of waste. Most mix designs are a blend of the inorganic binding reagents listed above. Organic-blending have also been tried as well. These include asphalt, thermoplastic, and urea- formaldehyde. Organic binding reagents are rarely used in commercial scale due to their high cost compared to inorganic binders.
S/S is an effective treatment wide variety of
organic and inorganic contaminants present in contaminated soil, sludge and
sediment. The ability to effectively treat a wide variety of contaminants
within the same media is a key reason why S/S is so frequently used in the
remediation. Adding to the versatility of S/S treatment is the fact that
contaminated material can be treated in-situ (in place) or ex-situ as already
segregated waste or excavated material.
Stabilization at the other end, refers to chemical changes of the hazardous constituents in a waste. The desired-goal changes include converting the constituents into a less soluble, mobile, or toxic form by adding additional materials. S/S treatment involves mixing a jointed reagent into the contaminated media or waste. Binding reagents commonly used include cement, cement kiln dust (CKD), lime, lime kiln dust (LKD), limestone, fly ash, slag, gypsum and phosphate mixtures, and a various-kind number of proprietary reagents. Due to the great variation of waste constituents and media, a mixing material, design should be conducted on each type of waste. Most mix designs are a blend of the inorganic binding reagents listed above. Organic-blending have also been tried as well. These include asphalt, thermoplastic, and urea- formaldehyde. Organic binding reagents are rarely used in commercial scale due to their high cost compared to inorganic binders.
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