Granted Patent B2

US 7,244,365 · App. 10/693,812 · Granted Jul 17, 2007

Abstract

Claims (23)

1. A process for safely decontaminating the chill water used in meat processing, which comprises:

(a) measuring the oxidative-reduction potential of the chill water in the chill bath of a chiller prior to introducing the meat to be processed and chlorine dioxide into the chill water, in order to obtain a reference oxidative-reduction potential for said chill water,

(b) introducing the meat to be processed into the chill water,

(c) feeding chlorine dioxide to said chill water to achieve a predetermined target oxidative-reduction potential in the chill water from 400 mV to 750 mV,

wherein the concentration of chlorine dioxide fed is from 100 ppm to 3000 ppm, and

wherein the amount of chlorine dioxide fed is sufficient to increase the oxidative-reduction potential of the chill water to a level that exceeds the reference oxidative-reduction potential established in (a), and achieves the target oxidative-reduction potential referenced in (c), provided that the level of chlorine dioxide in the chill water does not exceed a residual level of 3.0 ppm;

(d) monitoring the oxidative-reduction potential of the chill water with an oxidative-reduction potential analyzer;

(e) monitoring the level of chlorine dioxide gas in the atmosphere surrounding the chill water with an air quality monitor; and

(f) terminating the flow of the aqueous solution of chlorine dioxide into the chill water, if the oxidative-reduction potential exceeds 750 mV, if the oxidative-reduction potential of the chill water meets the target established in (c), or if the level of chlorine dioxide gas in the atmosphere surrounding the chill water exceeds 0.3 ppm.

2. The process of claim 1 wherein said chlorine dioxide is an aqueous solution of chlorine dioxide generated on site by means of a chlorine dioxide generator achieving a generation efficiency of at least 90% and the oxidative-reduction potential is measured with an oxidative-reduction potential sensor.

3. The process of claim 2 wherein the flow of aqueous chlorine dioxide to the chill water is controlled by a master on-line control unit that receives analog and/or digital signals from the chiller, the chlorine dioxide generator, the oxidative-reduction potential analyzer, and the air quality monitor.

4. The process of claim 3 wherein the oxidative-reduction potential of the chill water and the level of chlorine dioxide gas in the atmosphere surrounding the chill are continuously and simultaneously monitored.

5. The process of claim 4 wherein the master control unit receives a signal from the chiller indicating that the chiller contains chill water and is operational before the chlorine dioxide generator is activated to supply chlorine dioxide to the chill water.

6. The process of claim 5 further comprising two or more oxidative-reduction potential sensors each connected to two or more oxidative-reduction potential analyzers, respectively, wherein the two or more oxidative-reduction potential analyzers are connected to the on-line master controller and send oxidative-reduction potential signals to the controller that are compared to each other to determine whether there is a discrepancy between them.

7. The process of claim 6 wherein predetermined target oxidative-reduction potential in the chill water is from 580 mV to 680 mV and the concentration of chlorine dioxide fed is from 750 ppm to 2000 ppm.

8. The process of claim 7 wherein the master on-line controller initiates a probe wash using a pump and/or a probe freshwater back flush if one or both of the ORP analyzers indicate a low ORP or if a discrepancy exists between the analyzers, which exceeds a limit considered to be unacceptable, and wherein an alarm is activated signaling such condition.

9. The process of claim 8 wherein an alarm is signaled when the level of chlorine dioxide gas in the atmosphere surrounding the chill water exceeds 0.1 ppm.

10. The process of claim 9 wherein the flow of the aqueous solution of chlorine dioxide into the chill water is terminated if the level of chlorine dioxide gas in the atmosphere surrounding the chill water exceeds 0.25 ppm.

11. The process of claim 10 wherein an interlocking circuit connects the on-line master control unit to the chlorine dioxide generator and terminates the flow of chlorine dioxide to the chill water if the chlorine dioxide level in the chill water or the surrounding air is unacceptable or if the target oxidative-reduction potential is met.

12. The process of claim 11 wherein an alarm is activated if the oxidative-reduction potential of the chill water is such that the chlorine dioxide level of the chill water is unacceptably high.

13. The process of claim 12 wherein the meat processed is poultry or seafood.

14. The process of claim 13 wherein all data described is collected and stored by the master control unit and is available for download either locally or remotely.

15. The process of claim 14 wherein the data is downloaded remotely by a land-based telephone line or cellular technology.

Assignments (19)