Bio-Macerator: thorough disintegration and uniform blending of the liquid phase and cosubstrate into a homogeneous biomass substantially increases the efficiency of biogas production. Bellin has developed a compact unit specifically for this purpose. By combining a positive displacement pump (which may be rotary lobe pump or progressing cavity pump) and a powerful macerator into a single unit, Bio-Macerator can prepare superior quality biosuspensions. It can simultaneously feed one or more fermenters and handle additional pumping tasks in the biogas plant when needed. With cutting blades self-compensating, self-lubricated mechanical seal in oil bath, a large collecting container galvanized steel (stainless steel on request), settling out sump for stones and metallic objects, with special opening for easy inspection and cleaning.