Testing the effect of different enzyme blends on increasing the biogas yield of straw and digested manure fibers

In this study, enzymatic treatment was tested to increase the biogas yield of wheat straw (WS) and digested manure fibers (DMF) in the Re-Injection Loop Concept, which combines anaerobic digestion with solid separation to enhance the biogas yield per ton of manure by:1. Digestion of the easily degradable fraction of manure in the biogas process.2. Separation of the residual recalcitrant digested fiber fraction project.3. Ultrasound and/or enzymatic treatment of the digested fiber fraction.4. Recirculation of the treated fiber fraction into the reactor.