Hazardous wast disposal method and composition

A method of immobilizing a hazardous waste comprising:

• (a) providing a dry fast setting cementitious composition in the form of finely divided particles having a set time and including at least one cement binder;
• (b) providing a volume of water containing an amount of a hazardous waste;
• (c) adding an amount of dry cementitious composition into the volume of water without any type of physical mixing of the cementitious composition and water other than the mixing which occurs merely by applying the cementitious composition into the water;
• the major portion of the particles of the cementitious composition have approximately the same drop rate through the volume of water, and
• the water contacts the dry cementitious composition when poured into the volume of water to hydrate the particles of the dry cementitious composition, the particles of cementitious composition dropping through the water without any type of physical mixing of the cementitious composition and water other than the action which occurs merely by applying the cementitious composition into the water, to displace excess water and form the hydrated cementitious composition particles in a substantially non-segregated mass;
• and
• (d) allowing the hydrated cementitious composition to set and cure to a solid mass for at least the set time to immobilize the hazardous waste.

A method of immobilizing hazardous waste comprising:

• (a) providing a dry fast setting cementitious composition in a form of finely divided particles of at least one cement binder, the composition having a set time;
• (b) providing a volume of water containing an amount of hazardous waste;
• (c) adding an amount of the dry cementitious composition into the volume of water without any type of physical mixing of the cementitious composition and water other than the action which occurs merely by applying the cementitious composition into the water, the amount being less than an amount necessary for full hydration of the dry cementitious composition with the volume of water;
• the major portion of the particles of the cementitious composition have approximately the same drop rate through the volume of water, so that the water contacting the particles of cementitious composition hydrates the particles as the particles drop through water;
• (d) allowing the cementitious composition to drop through the water without any type of physical mixing of the cementitious composition and water other than the action which occurs merely by applying the cementitious composition into the water, displacing the excess water as a result of the dropping of the cementitious composition;
• and
• (e) allowing the hydrated cementitious composition to form into a cured substantially non-segregated mass to immobilize the hazardous waste.