Automation of disinfection process in beverage industry
August 2006
Analytical Instrumentation & Environmental Monitoring
Peracetic acid is a disinfection agent used in the disinfection of re-usable plastic bottles in the beverage industry. 35 000 bottles are disinfected per hour through the addition of this agent. The manual and non-continuous measurement and dosing of peracetic acid lead to the occurrence of overdosage and underdosage. The consumption of the disinfection agent is ideally minimised for both economic and ecological reasons.
The application of JUMO measuring cells allow for a continuous measurement of the peracetic acid, automatic corrective dosing and a continuous display of the concentration.
The bottles pass through the following cleaning stages:
1. Preliminary cleaning and flushing out of any foreign bodies.
2. Cleaning of the bottles with caustic soda (NaOH) at a temperature of 58°C.
3. Upside-down flushing of the bottles.
4. Disinfection of the bottles in an immersion bath, after which the bottles are allowed to drip-dry.
5. The bottles are moved onto the bottle rinser and the cleaning of the bottles with peracetic acid with a dosage of 50 ppm.
6. Finally, the bottles are flushed out with sterile water and moved on for filling.
Peracetic acid passes through the sensor membrane into the electrode chamber, which is filled with electrolyte with an Au cathode and an Ag/AgCl anode. Since the sensor is operating in the diffusion-limited current range, every molecule of disinfectant that reaches the cathode surface is immediately reduced. A corresponding counter-reaction takes place at the anode. The electrical current that is generated by the reactions at the electrodes is proportional to the concentration of the disinfection agent in the solution and serves as the measurement signal, after appropriate conversion and calibration. The calibration procedure requires carrying out an adjustment of the slope (the reference value from the DPD determination). Zero point calibration is not required for the membrane-covered measuring cells in this system.
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