ways to prevent avdunsning and air contact in a slurry pit and a slurry pit which closes automatically when the urine reaches the outlet

摘要

The method involves preventing air from reaching the urine by an oil layer (31) floating on the urine. The oil layer is prevented from being sucked out with the urine when the well is emptied by a float-controlled valve (26) which closes the outlet (17) before the oil layer reaches it.