36results about How to "Reduce Leachability" patented technology

This invention is a novel process for removing volatile mercury from a gas stream to produce a filtered solid. The gas stream is contacted with treating agents which comprise a semivolatile acidic vitrifying compound such as boric acid, water, oxygen-containing gas and a chlorine source. The filtered solids produced in the process have low mercury leachability thereby allowing the solids to be used, for example in flyash-containing concrete.

Heavy metal bearing products during production, processing and/or handling, and/or in landfills, storage or retention areas are stabilized prior to the generation or management as a waste by applying heavy metal stabilizing agents into the product stream thus avoiding complex and costly processing and treatment of waste under hazardous waste regulations.

A method for preparing a class of highly stabilized and soil-dispersible nanoparticles and using the nanoparticles as a remediation technology for immobilizing toxic metals at toxic metal contaminated sites. The method employs a composition containing select polysaccharides (starch or cellulose) as a stabilizer for the nanoparticles in a liquid carrier, and results in suspensions of nanoparticles of desired size and mobility in water, soils or sediments. The stabilizer can facilitate controlling the dispersibility of the nanoparticles in the liquid carrier. An effective amount of the composition is delivered to a contaminated site so that the nanoparticles can immobilize one or more toxic metals of the contaminated site.

A method of collecting, treating, transporting and disposing of hazardous debris which combines the standards of macroencapsulation and microencapsulation and involves the use of a liner to contain hazardous debris together with reagents that reduce leachability of a constituent of the hazardous debris. The liner is supported in a rolloff box or other transportable container on site where the hazardous debris is collected. Prior to placing hazardous debris into the liner, a layer of reagent(s) is provided in the bottom of the liner. Once hazardous debris is loaded in the liner, addition free flowing reagent(s) is/are added to fill void space in and around the hazardous debris, after which the top of the liner is sealed for disposal in a landfill.

The invention generally relates to system and method for recovering sodium bicarbonate from a solid waste, and more particularly to a method and system for recovering sodium bicarbonate from fly ash of a coal fired plant collected downstream of an injection process for pollution reduction from the industrial process.

The invention relates to a method for producing a brick from oil sludge and coal gangue as raw materials. The brick comprises the following components in percentage by weight: 10 to 20 percent of oilfield oil sludge, 10 to 30 percent of coal gangue, 40 to 65 percent of clay, 5 to 20 percent of water and 0.5 to 3 percent of modifying additive. The method comprises the following steps of: stirring the components uniformly in a stirring device to form a semi-finished brick blank, and drying and roasting the brick blank to form a finished product of the brick. By combining an internal combustion process for manufacturing the brick by sintering and making full use of heat values of the oil sludge and the coal gangue, the method reduces external fuels during roasting, saves a large amount of energy, meanwhile solves the treatment problem of the oil sludge and the coal gangue, and protects the environment. The brick manufacturing method is simple, has low cost, realizes reduced, harmless and recycling requirements of solid waste treatment, and has good market prospect and popularization value.

The invention discloses a municipal sludge pyrolysis treatment device for whole-course closed negative pressure, solidifying heavy metal in sludge and avoiding secondary pollution so as to overcome the defect that a traditonal treatment method of municipal sludge is easy to cause secondary pollution. Meanwhile, the invention also discloses a municipal sludge pyrolysis treatment packaged technologywith the application of the above device, comprising the following processes: a thermal tempering separation process, a pyrolysis carbonization process and a tail gas treatment process. By the technology and the device, resource utilization of municipal sludge can be realized, cyclic development of ''treating waste by waste'' can be achieved, energy recycling of municipal sludge is realized, andexternal energy is reduced. By the whole technological process, heat balance can be realized, and secondary environmental pollution is avoided.

The invention discloses a process for preparing the building ceramsite by synergistically melting and sintering of multiple inorganic hazardous wastes. The process comprises the steps of synergistically mixing the powdery and muddy inorganic hazardous waste, the inorganic residues obtained after hazardous waste treatment, a high-salt content concentrated solution obtained after sewage treatment and as the process water and an inorganic auxiliary agent, and drying after granulation; taking the organic hazardous wastes, such as the waste lubricating oil, the mineral oil and the hazardous waste pyrolysis oil, etc., as fuels, melting and sintering, recycling a carrier gas during a pellet drying process; cooling the sintered product, and screening to obtain the ceramsite and the pottery sand. The ceramsite can be used as a roadbed material, a concrete aggregate, a light brick filling material and a raw material required by a cement for mixture and production. According to the process, the purposes of harmless treatment and final resource utilization of various inorganic hazardous wastes are achieved, the problems that the single inorganic hazardous waste treatment is high in investment,the technological process is long, the residues are difficult to treat and the like are solved, and the secondary pollution emission during the hazardous waste treatment process is greatly reduced.

A system and method for stabilizing fission products in a cermet for long term storage. The method includes forming a metal oxide precipitate, combining the metal oxide precipitate with an undissolved solid, and densifying the combined metal oxide precipitate and the undissolved solid to provide a cermet having a ceramic dispersed phase and a metallic matrix phase, wherein the metallic matrix phase includes metallic content from the undissolved solid. The undissolved solid can include fission product metals from the reprocessing of irradiated nuclear fuel. The cermet waste loading can be greater than approximately 30 percent, reducing waste volume by 50 percent or more when compared to baseline glassified articles.

The invention discloses a long-acting evaluation method for active magnesium oxide solidified/stabilized zinc-containing smelting slag based on carbonation accelerated exposure. The long-acting evaluation method comprises the following steps: adding active magnesium oxide to carry out solidification/stabilization treatment on the zinc-containing smelting slag, and maintaining; the method comprises the following steps: preparing saturated CO2 water, measuring the pH value, carrying out accelerated carbonation continuous extraction on zinc-containing smelting slag after active magnesium oxide treatment and untreated zinc-containing smelting slag, and measuring the pH value, the conductivity, the magnesium ion concentration and the zinc ion concentration of an extract liquid; based on the change rule of pH, conductivity and magnesium ions in the leaching solution, determining the number of times of accelerated carbonation leaching; and based on the corresponding relation between the average concentration of the accumulated leaching liquid zinc and the accumulated carbonic acid exposure, the endurance capacity of the repaired slag body to carbonic acid is evaluated. According to the method, an accelerated carbonation exposure test is designed, key environmental factors influencing the release behavior of zinc in the active magnesium oxide solidified/stabilized zinc-containing smelting slag are considered, and the long-term activation risk of zinc in the smelting slag after solidification/stabilization repair is systematically evaluated.

The invention discloses a waste incineration power generation fly ash solidification method which comprises the following steps: S1, mixing fly ash, ground phosphate rock and hydrolysate of a silane coupling agent containing an epoxy group, standing for reaction, and drying to obtain a fly ash premix; s2, mixing the fly ash premix with an aqueous solution of gelatin, heating and stirring for reaction, and drying to obtain a fly ash mixture; and S3, mixing the fly ash mixture with cement, adding a proper amount of water, uniformly stirring, and standing and curing in a mold to form a cured body. According to the solidification method, the compressive strength of the fly ash cement solidification body can be improved, the leaching property of heavy metal impurities in the solidification body is reduced, the obtained solidification body can meet the requirement for being used as a building material under the condition that the fly ash is high in mixing amount, efficient, energy-saving and economical recycling of the waste incineration power generation fly ash is facilitated, and the economic benefit is increased. The actual use requirements are met.

The present invention relates to an improved process for treating high sulphate waters. In particular, the present invention relates to an improved process making use of aluminium compounds in order to precipitate layered double hydroxide compounds and any one or more of metals, sulphate, aluminate and phosphate. The present invention further relates to the use of one or more particle segregation stages, as well as the return of aluminium containing compounds from the particle segregation stage and aluminium compounds from a further reaction stage to an initial reaction stage.