Abstract:
A process for solidifying organic waste in cement for transport and storage in solid form by mixing organic waste, water, and a cationic amine to form an emulsion, mixing the emulsion with cement to form a mixture without breaking the emulsion, casting the mixture in a form, and curing the mixture to a solidified form. In a preferred embodiment of the process, a particulate material with a negative surface charge is included in the mixture to neutralize positive charges on the cationic amine and the cement. An alcohol or glycol may be included in the emulsion to enhance the holding power and integrity of the emulsion by controlling size and uniformity of emulsion particle size. The process is applicable to organic wastes such as waste oils, halogenated solvents, non-halogenated solvents, pesticides, herbicides, liquids and sludges containing heavy metals, radioactive mixed wastes and mixtures thereof.
Abstract:
According to the present invention, a fibrous material having a property to adsorb radioactive nuclides in the form of ion or molecule onto its surface is added to a cement type hydraulic solidifying material used for a solidifying material, a waste container, a structure in disposal site and a back-filling material used for production of a waste form of radioactive wastes, whereby improvement of long-term endurance of the waste form, the structure and the like and diminishment of leaching of radioactivity from the waste form and the like can be simultaneously attained.
Abstract:
Wastes are placed in a container, and the container is closed by a lid having a port sealed by a disc. A cutting tool having a hollow drive stem pierces the disc. A grout slurry is fed through the stem so as to discharge into the container and embed the wastes in the grout when set. The wastes may be contained in a crate in the container, and may also take the form of a glove box which itself contains waste objects.
Abstract:
A method of grouting formations with a cementitious material comprising microfine ground slag is useful for stabilizing and strenghtening soil and rock formations as well as underground structures associated with buildings, tunnels and dams. A composition is provided which comprises water, a dispersant, slag and an accelerator to activate the slag. The method and composition are particularly useful for preventing permeation of water such as for grouting dam curtains and containing and stabilizing hazardous wastes including nuclear waste material.
Abstract:
A concrete manufacturing process includes pouring a fluidized cement containing a short fiber as an admixture into a concrete manufacturing mold; applying a predetermined level or levels of pressure to the entire fluidized cement poured into the mold, while a gas is introduced into the cement; and hardening the cement as the gas introduced thereto forms bubbles which burst and generate vibration when they are vented through a venting section provided for the mold. When the cement is hardened to some degree, the hardening may be continued in a temperature-controlled liquid bath or followed by curing with steam.
Abstract:
The present invention relates to a process for the immobilization of ion hange resins originating from the secondary circuits of pressurized water nuclear reactors and gas-cooled graphite-moderated reactors, wherein the ion exchange resins are saturated with a base, preferably sodium hydroxide, under conditions such that the pH of the medium is greater than about 9 and such as to favor the release of ammonia, after which the said resins are concreted with a hydraulic binder.
Abstract:
A volume-reducing solidification treatment method for radioactive waste liquid containing boron primarily in the form of boric acid or borates is disclosed.After an alkali is added to the waste water to adjust pH thereof, and optionally after evaporation concentration is carried out, soluble calcium compounds such as Ca(OH).sub.2 are added, the waste water is stirred at a specific temperature to form insoluble calcium borate aged at a lower temperature than that of forming borate, and evaporation and concentration is carried out, which raises the concentration of the solid component. The concentrated liquid obtained is solidified with cement.The concentrated liquid may also be dried into a powder using a thin film evaporator.Liquid containing insoluble calcium borate obtained after solid-liquid separation may be recycled for use as a waste water pH adjusting agent, or, may be evaporated and concentrated, and the concentrated liquid may be solidified with cement along with the concentrated solid component obtained through solid-liquid separation.
Abstract:
Described herein are cementitious composite materials incorporating carbon nanostructures (e.g., nanotubes, nanoplatelets, nanoribbons) that are employed as amendments (i.e., admixtures or additives) to cementitious waste forms as a means to enhance radionuclide and hazardous waste (e.g., heavy metals, toxic organics) retention wherein the incorporation of well-dispersed carbon nanostructures yields more effective waste forms through the resulting modification of the cementitious composite nano-, micro-, and meso-structure (e.g., hindering the infiltration of oxygen and the leaching of waste), and the chemical interactions between chemically-affine waste molecules and the amended cementitious composite.
Abstract:
A hazardous material storage bank includes a wellbore extending into the Earth and including an entry at least proximate a terranean surface, the wellbore including a substantially vertical portion, a transition portion, and a substantially horizontal portion; a storage area coupled to the substantially horizontal portion of the well bore, the storage area within or below a shale formation, the storage area vertically isolated, by the shale formation, from a subterranean zone that includes mobile water; a storage container positioned in the storage area, the storage container sized to fit from the wellbore entry through the substantially vertical, the transition, and the substantially horizontal portions of the wellbore, and into the storage area, the storage container including an inner cavity sized enclose hazardous material; and a seal positioned in the wellbore, the seal isolating the storage portion of the wellbore from the entry of the wellbore.
Abstract:
The present invention provides a spent nuclear fuel assembly storage including a metal cask which stores a spent nuclear fuel assembly and a container body which stores the metal cask and has a substantially hexagonal tubular shape, and an assembly of the spent nuclear fuel assembly storage containers, and a method of assembling the spent nuclear fuel assembly storage container.