Combined Chemical Oxidation/Assisted Bioremediation of Contaminats

Abstract

Particles containing a metal peroxide in which the metal is chosen from the groups IIa and IIb of the periodic table and in which at least 50% by weight of the particles have a diameter higher than 20 μm. Process for the preparation of such particles comprising: (a) mixing at least one metal oxide or hydroxide, the metal being chosen from the groups IIa and IIb of the periodic table, in the form of an aqueous solution, a suspension or a solid, with an aqueous hydrogen peroxide solution, (b) allowing the metal oxide or hydroxide to react with hydrogen peroxide to form a suspension of the corresponding peroxide, (c) adding to this suspension at least one additive, and (d) drying the resulting peroxide suspension.

1 : A kit for the combined chemical oxidation/assisted bioremediation of contaminated materials, comprising: 
 i. at least one metal chelate, and    ii. at least one peroxide compound.    
     
     
         2 : The kit according to  claim 1 , wherein said at least one metal chelate comprises a Fe chelate.  
     
     
         3 : The kit according to  claim 1 , wherein said at least one peroxide compound comprises at least one of Ca, Mg and Zn peroxide or sodium percarbonate or hydrogen peroxide.  
     
     
         4 : The kit according to  claim 1  comprising at least two peroxide compounds.  
     
     
         5 : The kit according to  claim 4  comprising one of hydrogen peroxide or sodium percarbonate and one of Ca, Mg and Zn peroxide.  
     
     
         6 : A method for the combined chemical oxidation/assisted bioremediation of contaminated materials, comprising contacting a contaminated material with at least one metal chelate and at least one peroxide compound.  
     
     
         7 : The method according to  claim 6 , wherein said material is soil or water.  
     
     
         8 : The method according to  claim 6 , wherein said at least one metal chelate comprises a Fe chelate.  
     
     
         9 : The method according to  claim 6 , wherein said at least one peroxide compound comprises at least one of Ca, Mg and Zn peroxide or sodium percarbonate or hydrogen peroxide.  
     
     
         10 : The method of  claim 4 , wherein the metal chelate can be added to the contaminant/medium and/or a chelating agent can be added to a medium that already contains a transition metal whereby the metal chelate forms in situ.  
     
     
         11 : The method according to  claim 6 , wherein a buffer is added to adjust the pH to a value of from 7 to 9.  
     
     
         12 : The method according to  claim 6  wherein at least two peroxide compounds are used, the metal chelate and the at least two peroxide compounds are added in any order.  
     
     
         13 : The method according to  claim 12  wherein one of hydrogen peroxide and sodium percarbonate and one of Ca, Mg and Zn peroxide are used.  
     
     
         14 : The method according to  claim 13 , wherein the one of Ca, Mg and Zn peroxide is added in a first stage, the metal chelate is added in a second stage, and the one of sodium percarbonate and hydrogen peroxide is added in a third stage.  
     
     
         15 : The method according to  claim 13 , wherein the metal chelate is added in a first stage, the one of hydrogen peroxide and sodium percarbonate is added in a second stage, and the one of Ca, Mg and Zn peroxide is added in a third stage.  
     
     
         16 : The method according to  claim 13 , wherein the metal chelate is added in a first stage, the one of Ca, Mg and Zn peroxide is added in a second stage and the one of hydrogen peroxide and sodium percarbonate is added in a third stage.