The Bryn-celynog slurry pit at Maes-imper - geograph

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 Organic matter, organic material, or natural organic matter refers to the large source of carbon-based compounds found within natural and engineered, terrestrial, and aquatic environments. It is matter composed of organic compounds that have c ...

, 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 A fertilizer (American English) or fertiliser (British English; see spelling differences) is any material of natural or synthetic origin that is applied to soil or to plant tissues to supply plant nutrients. Fertilizers may be distinct from ...

that can eventually be reused on their lands to fertilize

crop A crop is a plant that can be grown and harvested extensively for profit or subsistence. When the plants of the same kind are cultivated at one place on a large scale, it is called a crop. Most crops are cultivated in agriculture or hydropo ...

s. 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.

Nutrient value

The liquid manure blend, or slurry, can be a rich source of

nitrogen Nitrogen is the chemical element with the symbol N and atomic number 7. Nitrogen is a nonmetal and the lightest member of group 15 of the periodic table, often called the pnictogens. It is a common element in the universe, estimated at seve ...

phosphorus Phosphorus is a chemical element with the symbol P and atomic number 15. Elemental phosphorus exists in two major forms, white phosphorus and red phosphorus, but because it is highly reactive, phosphorus is never found as a free element on Ea ...

, and

potassium Potassium is the chemical element with the symbol K (from Neo-Latin '' kalium'') and atomic number19. Potassium is a silvery-white metal that is soft enough to be cut with a knife with little force. Potassium metal reacts rapidly with atmosp ...

Risks

Slurry pits present risks of drowning, as well as of suffocation. Decomposition generates gases such as ammonia, methane, carbon dioxide, and

hydrogen sulphide Hydrogen sulfide is a chemical compound with the formula . It is a colorless chalcogen-hydride gas, and is poisonous, corrosive, and flammable, with trace amounts in ambient atmosphere having a characteristic foul odor of rotten eggs. The und ...

. 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 UK Health and Safety Executive also warns against the creation of naked flames near slurry pits, as gases such as methane are inherently flammable. 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. According to the Health and Safety Authority of Ireland, between 2000 and 2010, 30% of all child fatalities on farms occurred from drowning in slurry or water.

References

Agricultural buildings Feces Organic fertilizers {{agriculture-stub

Nutrient value

Risks

See also

References