Method and system for the treatment of water and fluids with chlorine dioxide

Abstract

Embodiments of the invention relate generally to methods and systems for treating aqueous systems associated with industrial wastewater applications and gas and crude oil drilling, pumping and production to reduce or eliminate contamination. In one embodiment, a method includes: an aqueous volume having an initial oxidant demand, an oxygen-containing oxidant and at least one chlorine oxide at substoichiometric amounts in an amount sufficient to eliminate the oxidant demand. The system includes: an aqueous treatment system comprising a containment system; at least one apparatus for introducing an oxygen-containing oxidant; and at least one apparatus for introducing at least one chlorine oxide into said containment system at controlled, substoichiometric quantities.

1 - 30 . (canceled) 
     
     
         31 . A method for treating an aqueous fluid, the method comprising
 (i) introducing a chlorine oxide into an aqueous fluid to form a chlorine oxide containing aqueous fluid, wherein the chlorine oxide consists essentially of chlorite, chlorine dioxide or a combination thereof, wherein the amount of chlorine oxide that is introduced into the aqueous fluid is a substoichiometric amount that provides a total dose of chlorine oxide that is less than a predetermined demand of the aqueous fluid for said chlorine oxide,   (iii) circulating at least a portion of the chlorine oxide containing aqueous fluid such that chlorine oxide containing aqueous fluid flows as a circulating fluid through a treatment system including a storage vessel and a venturi, and   (iii) introducing an oxidant into the circulating fluid using the venturi, wherein said oxidant is selected from air, oxygen, ozone, and combinations thereof,   thereby treating the aqueous fluid.   
     
     
         32 . The method of  claim 31 , comprising introducing caustic into the aqueous fluid. 
     
     
         33 . The method of  claim 31 , wherein the chlorine oxide is chlorite. 
     
     
         34 . The method of  claim 31 , wherein the aqueous fluid initially comprises sulfides and comprises no detectable sulfides following treatment. 
     
     
         35 . The method of  claim 34 , wherein the treatment time is less than 60 minutes. 
     
     
         36 . The method of  claim 31 , wherein the aqueous fluid has an initial chlorine dioxide demand of 30 mg/l to 5000 m/gl. 
     
     
         37 . The method of  claim 31 , wherein the oxidant is air. 
     
     
         38 . The method of  claim 37 , wherein the chlorine oxide is chlorite. 
     
     
         39 . The method of  claim 31 , wherein the oxidant is introduced at a flow rate that promotes oxidation over off-gassing of hydrogen sulfide.