Impra is a biological – mechanical pulping process for biogas substrate. It increases the gas yield, improves substrate properties and permits the use of fiber-rich biomass. A wet grinding system combines and inoculates the material with the biological additive IMPRAmax. For maximum efficiency, Impra only works on what your biogas plant cannot process alone: substrate is taken directly from the fermenter and after processing, is passed back into the fermenter, or to the secondary-digester/fermenter.
Impra works like a ruminant. Mechanical energy and micro-organisms work together to quickly release hard to access nutrients from wood fibers. This means you can use ligno-cellulose rich substrates such as grass, clover, whole crop silage, solid manure or straw.