摘要:
The present invention concerns a method for separating at least one predetermined element from the material involved in an industrial process, characterised in that said industrial process is associated in loco with an electrocapturing process by electrolysis of said at least one element.
摘要:
Die Erfindung betrifft ein Verfahren zur Aufarbeitung von Minenwässern mittels einer Membranfiltrationsanlage, umfassend - mindestens ein Membranfiltermodul mit mindestens einer Membrane mit einer filteraktiven Membranfläche von mindestens 0,5 m 2, - mindestens eine Zulaufeinrichtung für die Minenwässer, - mindestens eine Fördereinrichtung zur Überführung der Minenwässer von der mindestens einen Zulaufeinrichtung in das mindestens eine Membranfiltermodul, und - mindestens je eine Abführeinrichtung je Membranfiltermodul für gebildetes Permeat und Konzentrat, wobei die Minenwässer in der mindestens einen Zulaufeinrichtung bereitgestellt werden, mittels der mindestens einen Fördereinrichtung zu dem mindestens einen Membranfiltermodul gefördert und dort einer Membranfiltration unterzogen werden, wobei die Minenwässer dem mindestens einen Membranfiltermodul mit einem pH-Wert im Bereich von 2 bis
摘要:
A system for recovering a spent etching solution is provided. The system including an etching device which is used for producing the spent etching solution in an etching reaction, an oxidation device which includes a first processing section for removing ammonia from the spent etching solution and a second processing section for oxidizing the spent solution passed from the first processing section, a regeneration device for regenerating the spent etching solution passed from the second processing section and an electrolysis device for plate out copper from the spent solution passed from the second processing section. At the same time, a method for recovering a spent etching solution is provided. The spent etching solution, by the system and method, can be recovered up to almost 100%.
摘要:
A method of treating aqueous industrial waste comprising the following steps : (i) storing the aqueous industrial waste in a holding vessel (ii) adding to the aqueous industrial waste a transition metal catalyst or precursor thereof and hydrogen peroxide to provide a concentration of the transition metal catalyst in a concentration from 0.1 to 100 mM and a concentration of the hydrogen peroxide from 1 to 1500 mM and (iii) releasing the effluent after treatment for further processing or directly into the environment, wherein the tansition metal catalyst is a specific mononuclear or dinuclear complex of a Mn (iii) or Mn (IV) transition metal catalyst, and wherein the pH of the aqueous solution is maintained within the operating window of 2.5 pH units in the pH range 7.5 to 11.5. The preformed catalyst is subjected to an electrochemical reduction step before addition to the waste solution.
摘要:
A volume-porous electrode is provided which increases effectiveness and production of electrochemical processes. The electrode is formed of a carbon, graphitic cotton wool, or from carbon composites configured to permit fluid flow through a volume of the electrode in three orthogonal directions. The electrode conducts an electrical charge directly from a power source, and also includes a conductive band connected to a surface of the electrode volume, whereby a high charge density is applied uniformly across the electrode volume. Apparatus and methods which employ the volume-porous electrode are disclosed for removal of metals from liquid solutions using electroextraction and electro-coagulation techniques, and for electrochemical modification of the pH level of a liquid.
摘要:
A method and apparatus for removing arsenic from an arsenic-bearing material. The method includes the steps of contracting an arsenic-bearing material with an arsenic leaching agent to form an arsenic-containing solution and arsenic-depleted solids. The leaching agent can be an inorganic salt, an inorganic acid, an organic acid, and/or an alkaline agent. The arsenic-depleted solids are separated from the arsenic-containing solution, which is contacted with a fixing agent to produce an arsenic-depleted solution and an arsenic-laden fixing agent. The fixing agent comprises a rare earth-containing compound that can include cerium, lanthanum, or praseodymium. The fixing agent is then separated from the arsenic-depleted solution. A recoverable metal in the arsenic-depleted solids, arsenic-containing solution or arsenic-depleted solution can be separated and recovered. Recoverable metals can include metal from Group IA, Group IIA, Group VIII and the transition metals.
摘要:
A method and system for removing mercury and hydrocarbons from an aqueous system wherein the aqueous system is passed successively through three filtration stages. The first filtration stage comprises an absorption media to reduce or remove mercury and hydrocarbons, the second filtration stage comprises a salt modified reticulated granular filtration media to reduce or remove mercury and hydrocarbons, and the third filtration stage uses a conductive matrix to further reduce residual mercury.
摘要:
A method and apparatus for separating arsenic from an aqueous solution containing arsenic. The method includes the steps of contacting an arsenic-containing solution with a first portion of fixing agent to remove at least a portion of the arsenic. An arsenic-laden fixing agent is separated from the solution and the partially depleted solution is contacted with a second portion of fixing agent. The fixing agent can include a high surface area insoluble compound containing one or more of cerium, lanthanum, or praseodymium. Following removal of the arsenic, the arsenic-depleted solution can be further processed to separate a recoverable metal through metal refining. The arsenic-laden fixing agent can be filtered to recover and recycle a filtrate to the solution for additional treatment, as well as using a partially saturated fixing agent to remove arsenic from fresh solution. An arsenic-containing solution can be formed from arsenic-containing solids such as contaminated soils, industrial byproducts and waste materials.
摘要:
A method and system for removing from an aqueous system which is contaminated therewith: (1) mercury present as colloids, ions and/or organically bound compounds, and (2) hydrocarbons solubilized, dispersed, and/or emulsified in the said system. Pursuant to the invention the aqueous system to be treated (such as "produced water")is passed successively through three filtration stages. The first filtration stage is provided with absorption media which effects reduction/removal of dispersed organically bound mercury species and of the dispersed and partially dissolved hydrocarbon phases, as well as of some colloidal mercury and other dissolved metallic species. The second filtration stage utilizes a salt modified reticulated granular filtration media for reduction/removal of slightly dissolved hydrocarbon phases, mercury in colloidal and ionic form and other dissolved metals. The third filtration stage is a polishing stage, which serves to further reduce by electroless or voltaic reduction residual elemental mercury and/or residual colloidal and ionic mercury. At this third stage metallic mercury is incorporated into a metallic matrix from which the mercury may preferably be recovered.
摘要:
L'invention concerne un procédé pour la diminution de la concentration de certains métaux dans la composition de l'eau. Ce procédé consiste à effectuer une micro-électrolyse de l'eau constituant l'électrolyte, l'ampérage du courant électrique utilisé se situant entre 15µA et 200 A/m ou m 2 d'électrodes; la tension se situe avantageusement entre 20 µ.V et 48 V. Selon un mode de réalisation, le dispositif de mise en oeuvre de ce procédé comprend un réacteur (1), l'eau à traiter arrivant en partie inférieure (2), l'eau traitée étant récupérée en partie (3), le carbonate de calcium et l'oxyde de fer étant récupérés à la base (4). Application au traitement de l'eau notamment destinée à la consommation humaine.