Method for oxidizing manganese species in a treatment device and treatment device

Abstract

The present invention relates to a method for oxidizing manganese species in a treatment device (10) comprising at least one anode unit (20) and at least one cathode (30), wherein said unit comprises at least one anode (21) and is confined by a housing (22), the housing defining a free inner volume (V), wherein (i) the housing comprises at least one permeable barrier (23) and the at least one cathode is located outside the anode unit, or (ii) the at least one anode unit comprises at least partly the at least one cathode, wherein the housing does not comprise a permeable barrier, characterized in that in (i) and (ii) the at least one anode and the at least one cathode have a distance (d) ranging from 0.5 mm to 100 mm. The invention furthermore refers to a respective treatment device (10).

1 . A method for oxidizing manganese species in a treatment device ( 10 ), the method comprising the steps
 (A) providing in the treatment device in a liquid at least one manganese species having an oxidation number below +7,   (B) providing in the treatment device at least one anode unit ( 20 ) and at least one cathode ( 30 ), wherein said unit comprises at least one anode ( 21 ) and is confined by a housing ( 22 ), the housing defining a free inner volume (V),   (C) applying a current to the at least one anode and the at least one cathode such that at least a portion of said at least one manganese species is anodically oxidized to a manganese species having the oxidation number +7,
 wherein 
 (i) the housing comprises at least one permeable barrier ( 23 ) and the at least one cathode is located outside the anode unit, or 
 (ii) the at least one anode unit comprises at least partly the at least one cathode, wherein the housing does not comprise a permeable barrier, 
   characterized in that in (i) and (ii) the at least one anode and the at least one cathode have a distance (d) ranging from 0.5 mm to 100 mm.   
     
     
         2 . The method of  claim 1 , wherein the at least one permeable barrier is an ion-selective permeable barrier. 
     
     
         3 . The method of  claim 1 , wherein in (ii) the at least one cathode is at least partly integrated in the housing. 
     
     
         4 . The method of  claim 1 , wherein (d) is ranging from 1 mm to 90 mm. 
     
     
         5 . The method of  claim 1 , wherein the at least one anode comprises a layer stack ( 25 ) of anode layers. 
     
     
         6 . The method of  claim 5 , wherein in the layer stack the anode layers have a distance (m) to each other ranging from 0.5 mm to 20 mm. 
     
     
         7 . The method of  claim 1 , wherein the at least one anode comprises a sheet, a mesh, a woven web, and/or an expanded metal. 
     
     
         8 . The method of  claim 1 , wherein the at least one anode has a surface factor of  1  or more. 
     
     
         9 . The method of  claim 1 , wherein the at least one anode comprises platinum, titanium, niobium, lead, gold, alloys comprising at least one thereof, oxides thereof, and/or mixtures thereof. 
     
     
         10 . The method of  claim 1 , wherein the at least one anode provides a total effective anode surface area A 1  and the at least one cathode a total effective cathode surface area A 2 , wherein A 1  is larger than A 2 . 
     
     
         11 . The method of  claim 10 , wherein A 1 :A 2  is ranging from 5:1 to 100:1. 
     
     
         12 . The method of  claim 10 , wherein A 1  is ranging from 10 dm 2 /dm 3  to 100 dm 2 /dm 3 , based on the free inner volume (V). 
     
     
         13 . The method of  claim 1 , wherein the treatment device and/or the at least one anode unit has at least one inner surface comprising a fluorinated plastic. 
     
     
         14 . A treatment device ( 10 ) comprising
   at least one anode unit ( 20 ) and at least one cathode ( 30 ), wherein said unit comprises at least one anode ( 21 ) and the unit is confined by a housing ( 22 ), the housing defining a free inner volume (V),     wherein
 (i) the housing comprises at least one permeable barrier ( 23 ) and the at least one cathode is located outside the anode unit, 
 or 
 (ii) the housing comprises at least partly the at least one cathode, wherein the housing does not comprise a permeable barrier, 
   characterized in that in (i) and (ii) the at least one anode and the at least one cathode have a distance (d) ranging from 0.5 mm to 100 mm.   
     
     
         15 . (canceled) 
     
     
         16 . The method of  claim 1 , wherein the liquid is acidic. 
     
     
         17 . The method of  claim 1 , wherein the liquid is acidic and the at least one anode comprises a layer stack ( 25 ) of anode layers. 
     
     
         18 . The treatment device of  claim 14 , wherein
 the at least one anode provides a total effective anode surface area A 1  and the at least one cathode a total effective cathode surface area A 2 , wherein A 1  is larger than A 2 ,   the at least one anode comprises a layer stack ( 25 ) of anode layers, and   the at least one anode comprises platinum, titanium, niobium, lead, gold, alloys comprising at least one thereof, oxides thereof, and/or mixtures thereof