# US 10,766,797 B2 · Method and composition for use in the cyclic process for the efficient generation of chlorine dioxide in dilute solutions

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- Number: US 10,766,797 B2
- Document ID: US10766797B2
- Status: Granted
- Kind: B2
- Application number: 16/350,668
- Filed: 2018-12-18
- Published: 2019-06-27
- Granted: 2020-09-08
- Earliest claimed: 2017-12-22
- Assignees: Truox, Inc.
- Applicants: Roy W. Martin
- Inventors: Roy W. Martin
- Web page: https://patentgrep.com/patent/US10766797B2

## CPC

- C02F 1/766: {by means of halogens other than chlorine or of halogenated compounds containing halogen other than chlorine}
- C02F 1/008: {Control or steering systems not provided for elsewhere in subclass C02F}
- C02F 1/76: with halogens or compounds of halogens {(C02F1/4674 takes precedence)}
- G01N 33/182: {Specific anions in water}
- C02F 2103/42: from bathing facilities, e.g. swimming pools
- C02F 2209/29: Chlorine compounds
- C02F 2303/04: Disinfection
- 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)
- G01N: INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES (measuring or testing apparatus or processes other than immunoassay, involving enzymes or microorganisms C12M, C12Q)

## Abstract

This invention relates to a method for monitoring and controlling the relative concentration of bromide ion used in the cyclic process for enhanced sanitation and oxidation of aqueous systems at aquatic facilities.

## Claims

### Claim 1

A method for determine the relative bromide concentration in an aqueous system of an aquatic facility using a cyclic process, the method comprising:
the cyclic process comprising activating bromide ions with an oxidant to produce free bromine, the free bromine oxidizes chlorite ions to produce chlorine dioxide, and reducing at least some free bromine back to bromide ions,
applying a composition comprising a bromide donor and a tracer; the composition is applied to the aqueous system to sustain a bromide ion concentration ranging from 2 ppm to 5000 ppm;
monitoring the tracer to determine the relative concentration of bromide ion, and
sustaining the bromide ion concentration to ensure the cyclic process and subsequent microbiological efficacy is achieved.

### Claim 2 (depends on 1)

The method of claim 1, wherein the tracer is sodium molybdate.

### Claim 3 (depends on 1)

The method of claim 1, wherein the tracer is cyanuric acid.

### Claim 4 (depends on 1)

The method of claim 1, wherein the tracer comprises a molybdate donor.

### Claim 5 (depends on 4)

The method of claim 4, wherein the concentration of molybdate measured in the aqueous system is sustained between 0.02 ppm to 2.0 ppm.

### Claim 6 (depends on 5)

The method of claim 5, wherein the concentration of molybdate measured in the aqueous system is sustained between 0.05 ppm to 1.0 ppm.

### Claim 7 (depends on 6)

The method of claim 6, wherein the concentration of molybdate measured in the aqueous system is sustained between 0.10 ppm to 0.80 ppm.

### Claim 8 (depends on 1)

The method of claim 1, wherein the bromide ion concentration ranges from 2 ppm to 500 ppm.

### Claim 9 (depends on 8)

The method of claim 8, wherein the bromide ion concentration ranges from 5 ppm to 100 ppm.

### Claim 10 (depends on 1)

The method of claim 1, the composition further comprising dialkylhydantoin.

### Claim 11 (depends on 10)

The method of claim 10, wherein the dialkylhydantoin comprises 5,5-dimethylhydantoin.

### Claim 12 (depends on 10)

The method of claim 10, wherein the dialkylhydantoin comprises 5-ethyl-5-methylhydantoin.

### Claim 13 (depends on 1)

The method of claim 1, wherein the microbiological efficacy comprises achieving a 3-log inactivation of Cryptosporidium.

### Claim 14 (depends on 13)

The method of claim 13, wherein the microbiological efficacy comprises achieving a 4-log inactivation of Cryptosporidium.