Controlled atmosphere

Controlled atmosphere

A controlled atmosphere is an agricultural storage method. An atmosphere in which oxygen, carbon dioxide and nitrogen concentrations as well as temperature and humidity are regulated.

Two major classes of commodity can be stored in controlled atmosphere:

  1. Dry commodities such as grains, legumes and oilseed. In these commodities the primary aim of the atmosphere is usually to control insect pests. Most insects cannot exist indefinitely without oxygen or in conditions of raised (greater than approximately 30%) carbon dioxide. Controlled atmosphere treatments of grains can be a fairly slow process taking up to several weeks at lower temperatures (less than 15°C). A typical schedule for complete disinfestation of dry grain (<13% moisture content) at about 25°C, with carbon dioxide, is a concentration above 35%(v/v) carbon dioxide (in air) for at least 15 days.[1] These atmospheres can be created either by:
    • adding pure gases carbon dioxide or nitrogen or the low oxygen exhaust of hydrocarbon combustion, or
    • using the natural effects of respiration (grain, moulds or insects) to reduce oxygen and increase carbon dioxide Hermetic storage.[2]
  2. Fresh fruits, most commonly apples and pears, where the combination of altered atmospheric conditions and reduced temperature allow prolonged storage with only a slow loss of quality.

See also

References

  1. ^ Annis, P.C. and Morton, R. 1997.The acute mortality effects of carbon dioxide on various life stages of Sitophilus oryzae. J. Stored Prod.Res. 33. 115-124
  2. ^ Annis P.C. and Banks H.J. 1993. Is hermetic storage of grains feasible in modern agricultural systems? In “Pest control and sustainable agriculture” Eds S.A. Corey, D.J. Dall and W.M. Milne. CSIRO, Australia. 479-482.

Wikimedia Foundation. 2010.

Игры ⚽ Поможем написать курсовую

Look at other dictionaries:

  • controlled atmosphere, (CA) — Controlled atmosphere storage. This technology controls gases in the atmosphere of cold storage facilities in a way that greatly prolongs the life of fruit, such as apples …   Combined glossary of agriculture

  • controlled atmosphere, (CA) — Controlled atmosphere storage. This technology controls gases in the atmosphere of cold storage facilities in a way that greatly prolongs the life of fruit, such as apples …   Combined glossary of agriculture

  • Controlled atmosphere — Controlled atmosphere. См. Контролируемая атмосфера. (Источник: «Металлы и сплавы. Справочник.» Под редакцией Ю.П. Солнцева; НПО Профессионал , НПО Мир и семья ; Санкт Петербург, 2003 г.) …   Словарь металлургических терминов

  • Controlled Atmosphere — Mit Controlled Atmosphere (CA) bezeichnet man die Kontrolle der Luftgase (und der Temperatur) in einem Transport oder Lagerraum, um eine Veränderung des Transportgutes zu verhindern oder auch um es gezielt zu verändern (Zweck: Beschleunigung der… …   Deutsch Wikipedia

  • controlled atmosphere — a gas or mixture of gases in which steel is heated to produce or maintain a specific surface condition. Controlled atmosphere furnaces are widely used in the heat treatment of steel as scaling and decarburisation of components is minimized by… …   Mechanics glossary

  • Controlled Atmosphere Killing — (CAK) is a method for slaughtering animals such as chickens by placing the animals in a container in which the atmosphere lacks oxygen and is made up of argon and/or nitrogen and/or CO2, causing the animals to lose consciousness with little to no …   Wikipedia

  • Controlled atmosphere killing — This article is about the method of killing farm animals. For the method of capital punishment, see nitrogen asphyxiation. Controlled atmosphere killing (CAK) is a method for slaughtering animals such as chickens by placing the animals in a… …   Wikipedia

  • controlled-atmosphere furnace — reguliuojamos atmosferos krosnis statusas T sritis automatika atitikmenys: angl. controlled atmosphere furnace vok. Ofen mit regelbarer Atmosphäre, m rus. печь с регулируемой атмосферой, f pranc. four sous atmosphère contrôlée, m …   Automatikos terminų žodynas

  • controlled-atmosphere furnace — krosnis su reguliuojama atmosfera statusas T sritis radioelektronika atitikmenys: angl. controlled atmosphere furnace vok. Ofen mit regelbarer Atmosphäre, m rus. печь с регулируемой атмосферой, f pranc. four sous atmosphère contrôlée, m …   Radioelektronikos terminų žodynas

  • controlled atmosphere — Смотри контролируемая атмосфера …   Энциклопедический словарь по металлургии

Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”