“…(Whitlock et al, 2016). Whitlock et al (2016) analyzed the advantages and disadvantages of various digester shapes based on digester performance, efficiency, mixing energy, reliability, maintenance and construction costs. The evaluation is primarily focused on pancake, silo-shape with conical and shallow-sloped bottom, and egg-shape digesters, and emphasizes the advantages of the egg-shaped and silo-shaped reactors.…”