Stabilization

The process in which additives are used to reduce waste’s danger or minimize a contaminant’s migration speed into the atmosphere or to reduce toxin levels.   

Because of this, stability can be described as a process in which contaminants are confined partially or totally by adding a support means, binder or other agent altering the waste’s natural physics, for example compressing or waterproof.

The processes that involve stabilization and solidification include:

WASTE SOLIDIFICATION
In order to obtain industrial waste solidification material is added to the waste to obtain a solid material mass that diminishes wastes’ compressibility and waterproofness.

ABSORTION
Through absorption contaminants can quickly join chemically or physically to stabilizing agents in a matrix, settings these free.  The treatment is considered as permanent since a physical – chemical force is needed to discharge the material from the absorption surface.

PRECIPITATION
Certain stabilization processes leak some contaminants, especially waste, to obtain a more stable form of itself. This phenomenon is applicable to the stabilization of inorganic waste, retained in the stabilized mass as part of the material’s structure. 

For example, sulfur salicylate sulfur  hydroxide, carbonate and phosphate form part of the stabilized material structure.

The stabilization that takes place at DESLER’s plant uses the following mechanisms:

• Microencapsulation
• Absortion
  
  

Stabilization developed at Desler’s plant employs some of the following mechanisms: 

Stabizing special waste frequently uses cement as a principal reactive and Portland cement is the most used for this purpose.  In treating waste cement is  mixed with water used in other dehydration processes or water that comes from  lixivation.

This type of stabilization is recommended for special waste containing hard metals , since elevated PH in cement retains metals under the form of  insoluble hydroxide or carbonate in the same hard structure. 

In the absence of organic contaminants clay is added in order to avoid having them interfere in the hydration mechanism

This type of substance can react with lime in the presence of water to produce a material with the same characteristics as cement.  Included in puzolanic material one finds ashes, slag from ovens and dust from cement ovens.  From the reaction of aluminum – silica, lime and water the outcome is a product called puzolanic concrete. 

The use of puzolanic material to stabilize waste is used for organic and inorganic substances. 

Mud stabilization frequently happens by adding calcium hydroxide or lime. Lime is also used to increment PH in acid mud and other radio actives that form part of the principal stabilization process.   

This type of technique is especially recommended to stabilize waste that has an elevated amount of heavy metals.