Question

In controlled atmospheric store
CO2 is used

Answer 1

A controlled atmosphere is an agricultural storage method in which the concentrations of oxygen, carbon dioxide and nitrogen, as well as the temperature and humidity of a storage room are regulated. Both dry commodities and fresh fruit and vegetables can be stored in controlled atmospheres.

Controlled atmosphere room

Controlled atmosphere building

Dry commodities Edit

Grains, legumes and oilseed are stored in a controlled atmosphere primarily to control insect pests.[1] Most insects cannot survive indefinitely without oxygen or in conditions of raised (>30%) carbon dioxide.[2] Such controlled atmosphere treatments of grains may take several weeks at lower temperatures (<15 °C). A typical schedule for complete disinfestation of dry grain (<13% moisture content) with carbon dioxide at approximately 25 °C is a concentration above 35%(v/v) carbon dioxide in air for at least 15 days.[3] These atmospheres can be created either by:

Adding pure carbon dioxide or nitrogen, or the low oxygen exhausts of hydrocarbon combustion, or

using the natural effects of respiration (by grain, molds or insects) to reduce oxygen and increase carbon dioxide (Hermetic storage).[4]

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