ENSPAR - Hygienisation Unit
If CATEGORY 3 ANIMAL BY PRODUCT waste materials (such as DAF slurry, fish waste, food waste etc. ...) are to be used in a biogas plant, a treatment for the reduction of germ numbers is often prescribed.
According to the EEC hygiene regulation, pasteurising for one hour at a temperature of at least 70°C is prescribed. The maximum particle size may not be larger than 12mm. The pasteurisation takes place pressure-free. Before, after and during the pasteurisation a strict separation between the black range (unpasteurised) and the white range (pasteurisied) must be ensured at any time. For this reason the treated substrate will be carried by a separate pump- and pipe-system which will be designed heat resistant. More information is to be inferred from the EEC hygiene regulation 1774/2002.
The substrate heating is realised by external heat exchangers. The substrate will circulate between heat exchangers and vessel via an eccentric screw pump until a necessary minimum temperature is reached. While pasteurisation the substrate remains for 1 hour into the vessel and is mixed by a central agitator, in order to keep the temperature distribution homogeneous. During the fully automated process the temperature is noted over time by a digital recorder. After the succesfull substrate-processing the material will be pumped down by a separate pump and pipeline.
For the adjustment of requirements, numerous versions are possible like heat recovery, component current hygienization, etc.…).