by Bioconservacion January 29th, 2015 0 comments


Discussion based on published article by UC Davis:

Ozone Applications for Post-harvest Disinfection of Edible Horticultural Crops. Trevor V Suslow. Extension of Vegetable Crops, University of California, Davis

  • The ozone treatment is not very effective in ethylene removal at the allowed ozone concentrations and under the current application mode (without forced air). 

"Injection of gaseous ozone, at non-hazardous levels, into the common air of a cold storage room has not been as effective in destroying ethylene and reducing odor as forced circulation of the conditioned air through an ozone reaction chamber. Simply, at low concentrations of ozone, random encounters with ethylene or objectionable odor volatiles is too slow a process" (Suslow, pag 6)
"… excessive exposure to ozone may injure plant tissue and effectively reduce storage or sensory life" (Suslow, pag 6)
On the contrary, BIOCONSERVACION  ethylene removal technology has been conceived to take the maximum advantage of forced air to assure air filtration efficacy.
Furthermore, there is no risk at all to damage produce. The BIOCONSERVACION ethylene removal system does not get in contact with the stored fruit/vegetables. It is only cleaning the surrounding air from undesirable volatiles like ethylene. 

  •  "Ozone is highly corrosive to equipment"(Suslow, pag 2)

 The use of ozone in the containers to improve the preservation of the load represents, indirectly, a high cost in maintenance of the permanent equipment. This is in addition to the already expensive maintenance of the ozone generations themselves (filter exchanges, periodic adjustments of the electronic components, corrosion of internal parts,...)
On the contrary, Bioconservacion technology is not causing any corrosion or damage to the permanent equipment and does not require any maintenance in itself.

  •  Ozone is toxic to humans

Ozone is lethal to humans with prolonged exposure to concentrations above 4 ppm. Ozone is readily detectable by human smell at 0.01 to 0.04 ppm. Federal Occupational Safety and Health Administration (OSHA) limits of exposure specify a 0.1 ppm threshold for continuous exposure during a 8-hour period and 0.3 ppm for a 15-minute period. At 1 ppm ozone has a pungent disagreeable odor and is irritating to the eyes an throat". (Suslow, pag 2)
The use of ozone poses a health hazard to the staff in charge of the operation. To handle it, preventive measures need to be taken with their associated costs.

Once again, this is not happening with BIOCONSERVACION ethylene removal technology.