# US 10,308,533 B2 · Method and system for the treatment of water and fluids with chlorine dioxide > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,308,533 B2 - Document ID: US10308533B2 - Status: Granted - Kind: B2 - Application number: 14/963,321 - Filed: 2015-12-09 - Published: 2016-03-31 - Granted: 2019-06-04 - Earliest claimed: 2013-03-15 - Assignees: Sabre Intellectual Property Holdings LLC - Applicants: Sabre Intellectual Property Holdings LLC - Inventors: John Y. Mason - Web page: https://patentgrep.com/patent/US10308533B2 ## CPC - C02F 1/76: with halogens or compounds of halogens {(C02F1/4674 takes precedence)} - C02F 1/727: {using pure oxygen or oxygen rich gas} - C02F 1/74: with air (aeration of stretches of water C02F7/00) - C02F 1/763: {Devices for the addition of such compounds in gaseous form} - C02F 1/78: with ozone {(C02F1/4672 takes precedence)} - C02F 2103/06: Contaminated groundwater or leachate - C02F 2103/10: from quarries or from mining activities - C02F 2103/16: from metallurgical processes, i.e. from the production, refining or treatment of metals, e.g. galvanic wastes - C02F: TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE (separation in general B01D; special arrangements on waterborne vessels of installations for treating water, waste water or sewage, e.g. for producing fresh water, B63J; adding materials to water to prevent corrosion C23F; treating radioactively-contaminated liquids G21F9/04; regeneration of reactants for recirculation into processes, see the relevant places for the processes) ## 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, sub stoichiometric quantities. ## Claims ### Claim 1 A method for treating an aqueous fluid, the method comprising (i) directly introducing a chlorine oxide into an aqueous fluid to make a chlorine oxide containing aqueous fluid, wherein the chlorine oxide is generated chlorine dioxide, chlorite, or a combination thereof, and 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; (ii) circulating at least a portion of the chlorine oxide containing aqueous fluid such that chlorine oxide containing aqueous fluid flows as a continuously circulating fluid through a treatment system including a storage vessel and a venturi; and (iii) introducing a non-ozonated oxidant into the circulating fluid using the venturi, wherein said oxidant is air, oxygen (O2) or O2-enriched air, thereby forming an aqueous fluid containing a combination of the chlorine oxide and the oxidant. ### Claim 2 (depends on 1) The method of claim 1, wherein directly introducing the chlorine oxide comprises introducing generated chlorine dioxide in the form of generated chlorine dioxide gas or in the form of a generated aqueous solution of chlorine dioxide. ### Claim 3 (depends on 1) The method of claim 1, wherein directly introducing the chlorine oxide comprises directly introducing sodium chlorite and directly introducing generated chlorine dioxide into the aqueous fluid. ### Claim 4 (depends on 1) The method of claim 1, wherein the aqueous fluid comprises oilfield water. ### Claim 5 (depends on 1) The method of claim 1, wherein the initial oxidant demand of the aqueous fluid prior to application of the method is about 30 mg/l to about 5000 mg/l. ### Claim 6 (depends on 5) The method of claim 5, wherein the initial oxidant demand of the aqueous fluid prior to application of the method is about 50 mg/l to about 500 mg/l. ### Claim 7 (depends on 5) The method of claim 5, wherein the aqueous fluid comprises oilfield water. ### Claim 8 (depends on 2) The method of claim 2, wherein the method eliminates sulfides as shown by the presence of no detectable sulfides in aqueous fluid treated according to the method, wherein the presence of sulfides is assessed with a Garret gas train test. ### Claim 9 (depends on 2) The method of claim 2, wherein aqueous fluid treated according to the method has a chlorine dioxide residual of 0.1 mg/l to 50 mg/l. ### Claim 10 (depends on 9) The method of claim 9, wherein the method comprises measuring and maintaining the chlorine dioxide residual of 0.1 mg/l to 50 mg/l. ### Claim 11 (depends on 1) The method of claim 1, wherein introducing the oxidant is performed at a flow rate that promotes oxidation of hydrogen sulfide over purging or stripping. ### Claim 12 (depends on 1) The method of claim 1, wherein the method is performed in a total treatment time of less than 24 hours. ### Claim 13 (depends on 1) The method of claim 1, wherein the method is performed in a total treatment time of less than 8 hours. ### Claim 14 (depends on 1) The method of claim 1, wherein the method is performed in a total treatment time of less than 60 minutes. ### Claim 15 (depends on 1) The method of claim 1, wherein the method further comprises introducing sodium hydroxide into the aqueous fluid. ### Claim 16 (depends on 1) The method of claim 1, wherein the non-ozonated oxidant is air drawn from the atmosphere the aqueous fluid being treated. ### Claim 17 (depends on 1) The method of claim 1, wherein directly introducing the chlorine oxide comprises directly introducing chlorite. ### Claim 18 (depends on 17) The method of claim 17, wherein chlorite is introduced together with the non-ozonated oxidant. ### Claim 19 (depends on 1) The method of claim 1, further comprising introducing an oxidizing or non-oxidizing biocide. ### Claim 20 (depends on 5) The method of claim 5, wherein directly introducing the chlorine oxide comprises directly introducing chlorite.