The slurry tank, AD, produced gas recovery unit, separator unit, solideliquid digested manure reservoirs, and lagoon are shown in Fig. 3. The slurry tank was constructed with open-cellars storage with a 12 m (D) and 6 m (H). Methane production in the slurry unit will lower the biogas yield of the digester. In the case of an open slurry unit, methane emissions are also undesirable for an animal’s well-being. Therefore, it is best to transport the manure from the slurry unit to the digester as soon as possible.