Abstract: A biogas digester tank heating method, system and modular heating rack is provided. The method can include providing a digester tank having a base and a vertical wall surrounding the base. A plurality of heating racks can be provided, where each of the plurality of heating racks is a pre-assembled unit including a plurality of parallel pipes and a stand configured to secure the plurality of parallel pipes to the base of the biogas digester tank. The plurality of heating racks can be secured to the base, adjacent to the vertical wall. Each of the plurality of heating racks can be connected to a heating manifold arranged outside of the digester tank in parallel such that a heat exchange fluid is configured to independently flow from the heating manifold through the plurality of parallel pipes of each individual heating rack of the plurality of heating racks.

Abstract: The invention relates to a device and a method for separating undissolved constituents out of biological fluids, especially for separating blood plasma out of whole blood. It is to propose a simple and cost-effective way by means of which undissolved constituents can be separated out of biological fluids, in particular blood plasma out of whole blood, and the pure fluid is presenting then as a pure liquid volume without any substrate. To solve this object, e.g., whole blood is placed into a feed chamber. The feed chamber is isolated in an all-over manner by means of a membrane from a per se closed cavity having a small height. The cavity is connected to a flow channel or an opening from which the/the separated blood plasma can be removed.