One method of treating incinerated waste comprises: size separating at least some of the incinerated waste into a first undersize fraction comprising particles smaller than the first separation size and into a first oversize fraction comprising particles larger than the first separation size; size reducing at least some of the first oversize fraction; size separating at least some of the size-reduced first oversize fraction into a second undersize fraction comprising particles smaller than the second separation size and into a second oversize fraction comprising particles larger than the second separation size; combining at least some of the first undersize fraction and at least some of the second undersize fraction into a fine fraction; and extracting metal from at least some of the fine fraction. Another method of treating incinerated waste comprises extracting metal by froth flotation from at least some of the incinerated waste. Systems are also disclosed.

A system and method for disposing non-radioactive mercury found in waste material at a concentration of greater than 260 mg of mercury per kg of the waste material is provided. The method includes a chemical treatment step followed by an encapsulation step. The chemical treatment includes mixing the waste mercury with sulfur in a reactor to convert the mercury into mercury sulfide. The chemical treatment also includes maintaining conditions within the reactor for reaction efficiency and safety. Other additives may be added to the reactor to further mitigate leachability or mobility of the mercury in order to meet a regulatory standard regarding waste mercury. The encapsulation includes placing the chemically treated mercury inside an impervious container, such as a steel, cement, or plastic container. The encapsulated and chemical treated mercury can then be placed in a landfill without an unacceptable risk to human health and the environment.

A method for removing elements, including heavy metals, from fly ash and from fly ash resulting from removal of SO.sub.x/NO.sub.x from flue gas using Na.sub.2CO.sub.3/NaHCO.sub.3/trona, is described. An aqueous suspension of the fly ash and/or a solution of the leachate from the fly ash is treated with dissolved ferrous compounds, such as FeSO.sub.4.7H.sub.2O and/or FeCl.sub.2.4H.sub.2O, at a chosen initial acidic pH, and the precipitation of the ferrous ions as the solution basifies sequesters the trace elements.

Portable wet drilling waste treatment. In one example embodiment, a method for portable wet drilling waste treatment may include transporting a transportable frame, maneuvering an open end of a waste conduit, vacuuming air and the wet drilling waste, using a motor-driven vacuum, into the open end of the waste conduit, through the waste conduit, and into a cyclonic separator, separating the wet drilling waste from the air using the cyclonic separator, using a waste auger to transport the wet drilling waste, using a treatment material auger to transport a treatment material, operating the waste auger and the treatment material auger at coordinated rates to transport an effective ratio of the wet drilling waste to the treatment material, using a mixing auger to simultaneously transport the wet drilling waste and the treatment material, and operating the mixing auger at an effective rate resulting in a solidified treated material.

The present invention includes formulations and methods to reduce Cr(VI) contamination, in which the formulation comprises (1) a reactive reducing agent comprising at least one reducing chemical capable of reducing Cr(VI) to Cr(III); and (b) one or more solvents. Moreover, the present invention includes formulations to reduce Cr(VI) within the coating, and Cr(VI) reducing kits with at least one color reference tool for evaluating the process and/or completion of the Cr(VI) reduction.

A method may include pumping a mercury solution into a disposal well. A system may include a source of aqueous mercury solution, a pump, and a wellhead, wherein the source of aqueous mercury solution is fluidically coupled to the pump and the pump is fluidically coupled to the wellhead.

A method comprising a) mixing and dissolving the solid hazardous heavy metal-containing composition with an acid solution; b) precipitating the heavy metal from the hazardous heavy metal acid compositions by; c) precipitating the heavy metal from the hazardous heavy metal acid composition with a heavy metal-precipitation agent; and d) separating out the heavy metal precipitate from the aqueous supernatant, whereby the heavy metal-precipitation agent comprises a diorgano-dithiophosphinic acid or the alkali metal or ammonia salts thereof. ##STR00001##

A method for decontaminating residual halogen species in a processed metal-containing layer without breaking vacuum includes processing a metal-containing layer (such as a metal oxide layer) using a halogen-containing process gas to form a processed metal-containing layer that includes residual halogen species, and chemically modifying the residual halogen species to form modified residual species using a reactive gas to decontaminate the residual halogen species. Decontamination may include neutralization and/or removal of the residual halogen species. The metal-containing layer may be an organometal oxide photoresist and processing with the halogen-containing process gas may form a patterned photoresist layer contaminated with the residual halogen species. The modified residual species may be further treated using dinitrogen plasma (pure or with additional gases) and/or additional reactive gases, both of which may be combined with maintaining and higher or lower temperature during the treatment.