Abstract:
The invention relates to an improved process for the treatment of bottom ash, which prevents excessive leaching of Sb and render them suitable for open application. In the process according to the invention, bottom ash is treated by (a) providing an aqueous suspension of the bottom ash; (b) mixing the bottom ash suspension originating from step (a) with green rust and allowing Sb(V) to be reduced to Sb(lll); and (c) introducing O 2 into the mixture originating from step (b). The invention also concerns a mixture of bottom ash and green rust, for example as obtainable by step (b), and the treated bottom ash as obtainable by step (c), as well as the use of said bottom ash.
Abstract:
The present disclosure relates to a multi-step method for processing peroxygen solutions for reuse or disposal. The method uses an enzyme and a reducing agent.
Abstract:
The present invention relates to a method of removing fluorinated material from a fluid comprising a fluorinated material and an oxidisable and/or enzymatically digestible substrate, the method comprising the steps of: a) introducing one or more oxidising agents and/or enzymes into the fluid; b) passing the fluid through an activated carbon matrix to remove at least part of the fluorinated material; and c) discharging the cleansed fluid from the activated carbon matrix. The present invention also relates to an apparatus for implementing the method.
Abstract:
This invention relates to the technology of ecotoxicants treatment, mainly chemical weapons (toxin agents), pesticides, hydrolysis products of toxin agents and pesticides. The method provides destruction of toxin agents, pesticides or their hydrolysates with further biodegradation of received products and can used for a wide range of ecotoxicants. The method can also be applied for cleaning of soils and objects contaminated with toxin agents and pesticides. In the claimed embodiments of the method, an amino acid reagent is used as a reagent for chemical neutralization of toxin agents, pesticides or their hydrolysates. Neutralization of ecotoxicants toxicity is carried out by application of a reagent containing an amino acid or a mixture of amino acids or peptides or derivatives of amino acids and peptides or their mixture in aqueous or aqueous organic medium. As the reagent hydrolysis products of protein containing factory waste can also be applied.
Abstract:
The invention consists of a method for treating polychlorinated biphenyl (PCB) contaminated media by: a) combining the media with a fluid containing one or more liquid hydrocarbons to form a media/fluid mixture; b) sonicating the mixture at audio frequency to extract PCB from the media into the fluid; and c) treating the fluid with sodium-containing alkali metal. The method may include additional steps to reduce the size of the media. Alternatively, the fluid can be decanted from the media after sonication and treated separately with sodium-containing alkali metal.
Abstract:
A method for decontaminating a product containing metals, wherein said product (1) is leached with soda (2); a cake (4) is recovered by means of solid/liquid separation and is washed with water prior to being neutralized by a neutralizing and stabilizing agent (9); once the leaching is finished, a soda solution (5) is recovered, whereby a first part thereof (5 a ) is neutralized by blowing carbonic gas (6), resulting in the formation of metal slurries (8) containing said metals and in the production of sodium carbonate (7) which is recycled with the second part (5 b ) of the recycled sodium solution, whereby said second part (5 b ) is recycled to said leaching.The invention can be used with the residues of incineration fumes.
Abstract:
The invention concerns a method for treating residues derived from garbage and/or industrial waste incineration fumes comprising the following steps: A: desalting (1, 1') the residues by washing with sodium carbonate (2) in sufficient amount or slightly in excess to solubilize all the salts including the sulphates and precipitate the soluble calcium, the pH being higher than 11, then carrying out a solid/liquid separation to obtain a desalinised cake (3); B: lixiviating said cake (3) resulting from step A with sodium carbonate in sufficient amount or slightly in excess to obtain by reaction with the lime present in the cake or added thereto if necessary, the alkalinity required for solubilizing amphoteric metals, the pH being higher than 12, obtaining by solid/liquid separation a cake (6) and a supernatant (7) which is neutralised with carbon dioxide (8) and filtering the recuperated solution to obtain metal hydroxide sludge (11) and an aqueous sodium carbonate solution (14) which can be recirculated towards step B itself, and C: neutralising at a pH between 6.5 and 8.5, the residues (6, 6') resulting from step B.
Abstract:
In a process for the separation of copper and heavy metals from incinerated garbage residue and slag, the residue and slag from garbage incineration or pyrolysis is heated to over 650 DEG C under reducing conditions together with substances containing chlorine or chlorides, such as flue gas cleaning residues, CaCl2 from the soda production, cooking salt, organic solvents or electroplating sludge containing chlorine, whereupon Cu-chlorides and volatile heavy metal chlorides, such as PbCl2 or ZnCl2, are drawn off in the gas phase.
Abstract:
Ozone depleting fluorocarbon compounds (18) are dehalogenated through more economic reduction reaction with solvated electrons formed from lower equivalents of reactive metals (14) than previously used by reacting the partial reduction products with nitrogen-containing bases, such as ammonia (12) or alternatively, without any reactive metal by reacting with the base alone. Mixtures of fluorocarbon refrigerants including difficult-to-separate azeotropes of dichlorodifluoromethane contaminated with clorodifluoromethane are reclaimed by treating only with weak non-aqueous nitrogen-containing bases to provide essentially chemically pure dichlorodifluoromethanerefrigerant suitable for recycling/reuse. Hazardous cyanides which may develop are converted to relatively benign products during the process by introducing a base (22) to convert volatile cyanides to more stable salts which in turn are converted to useful compounds of lesser toxicity.
Abstract:
Disclosed is a method of photochemically oxidizing gaseous organic compounds, an apparatus for photochemically oxidizing gaseous organic compounds, a lining insert (66) for an apparatus for photochemically oxidizing gaseous organic compounds, and a method for producing such a lining. The principal method comprises: (a) exposing gaseous organic compounds to ultraviolet light to oxidize the gaseous organic compounds into gaseous oxidation products; and (b) reacting the gaseous oxidation products with an internal surface of a reaction chamber (46), the internal surface comprising a dry porous cementitious and sorbent material which is chemically reactive with the gaseous oxidation products, with the gaseous oxidation products being reacted with the dry porous cementitious material to produce solid reaction products incorporated in sidewalls of the chamber.