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A slurry pit, also known as a farm slurry pit, slurry tank, slurry lagoon or slurry store, is a hole, dam, or circular concrete structure where farmers gather all their animal waste together with other unusable organic matter, such as hay and water run off from washing down dairies, stables, and barns, in order to convert it, over a lengthy period of time, into fertilizer that can eventually be reused on their lands to fertilize crops. The decomposition of this waste material produces deadly gases, making slurry pits potentially lethal without precautions such as the use of a breathing apparatus with air supply.
Slurry pits present risks of drowning, as well as of suffocation. Decomposition generates gases such as ammonia, methane, carbon dioxide, and hydrogen sulphide. The latter two are heavier than air and will not disperse quickly from low places. Carbon dioxide is odorless, and hydrogen sulfide quickly becomes undetectable by odor by destroying victims' sense of smell. If inhaled, they can cause rapid unconsciousness by poisoning or displacement of oxygen leading to hypoxia. Death may follow then from poisoning or hypoxia directly, or by drowning caused by unconsciousness. The health and safety executive of Northern Ireland specifies activity in a slurry pit as specialist work, requiring the worker to have a separate air supply and a harness lifeline managed by two additional people outside the tank.
- "What is a slurry tank? | Dairy Farming Facts". Thisisdairyfarming.com. Retrieved 2013-06-24.
- "Slurry lagoons | Dairy Farming Facts". Thisisdairyfarming.com. Retrieved 2014-06-08.
- "Slurry Gases Can Kill" (PDF). HSENI. Archived from the original (PDF) on 4 March 2016.
- "The lethal risks of working with slurry". BBC News Online. 17 September 2012.
- Boy drowned in Shropshire slurry pit, inquest told BBC News Online 2010-06-09
- Two men killed in Essex farm slurry pit BBC News Online 2011-07-16
- Slurry tank tragedy: Rugby star Nevin Spence killed BBC News Online 2012-09-16
- "Boy dies in slurry tank accident near Dunloy, County Antrim". BBC News Online. 8 June 2014.
- "Dunloy farm death: What is slurry and why is it so dangerous?". BBC News Online. 8 June 2014.
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