Recycling installation for agricultural waste products, uses solid liquid separation, microfiltration or ultrafiltration and reverse osmosis filtration steps

摘要

Following a solid-liquid separation step, the liquid phase is subjected to a microfiltration or ultrafiltration step and the liquid phase is then filtered by reverse osmosis inside a pressurized tank (18) containing completely submerged filter elements (20), to produce drinking water. A recycling installation for agricultural waste products and similar materials, especially for urine and excrement produced on pig farms or the effluent from oil mills or presses, treats the waste material using a process comprising the following steps : (a) separation of the solid phase from the liquid phase ; (b) filtration of the liquid phase using microfiltration or ultrafiltration membranes in order to remove suspended fibres and macromolecular substances ; and (c) producing drinking water from the filtered liquid phase via a reverse osmosis step inside a pressurized tank with an upper cover and a series of tubular reverse osmosis filter elements in its lower part, these filters being arranged parallel to each other in columns with the filter tubes arranged axially and completely submerged in the liquid.