Slurry pit

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Slatted floor in a pigsty, there is a manure pit under it
Slurry tank

The slurry pit is a structure sunk into the ground as an intermediate storage facility for slurry or liquid manure . Other names are cesspool or slurry cellar .

Slurry pits can be found today where livestock or cattle are kept in stables. In the past, the first cesspools were actually open pits as part of a dung heap ; later, brick-lined and lidded pits, which were often connected to an outhouse , became common. In the case of a manure cellar , the barn has a cellar for storing manure. Such a manure cellar extends around two to four meters deep into the ground. The faeces of the animals fall through the slatted floor directly into this deposit. The manure of the animals is then sucked out with a slurry tank and driven onto the fields for fertilization.

Today, liquid manure storage facilities are often implemented as closed liquid manure containers as silos / cisterns in order to minimize odor nuisance and to enable other uses such as biogas production . In addition, elevated tanks have better accessibility, for example to remove sediment layers from sand.

In completely airtight liquid manure tanks, the oxygen-free decomposition of the organic components in the liquid manure can increase the concentrations of ammonia and methane in the gas space to such an extent that an explosive gas-air mixture is created. Slurry tanks are therefore minimally ventilated. Less often they are created as explosion-proof pits; this is even necessary if biogas is to be obtained.

Septic tanks or septic tanks in houses and sometimes even small sewage treatment plants are sometimes referred to colloquially as cesspools.

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