Biomass pulp digester

A multi-stage horizontal digester for use breaking down a pulp, the multi-stage horizontal digester comprising:

• two or more vessels;
• a multi-stage auger with an inner diameter and an outer diameter;
• the multi-stage auger within the two or more vessels;
• the multi-stage auger including two or more transportation sections and one or more compression section;
• one or more auger connections separating the two or more transportation sections and the one or more compression section;
• each auger connection of the one or more auger connections allowing the multi-stage auger to be separated and the sections rearranged into a different order;
• the two or more transportation sections each having a constant inner diameter and a constant outer diameter, thus allowing the pulp time to mix and break down without a need for use of a holding tank;
• the one or more compression section including an increasing inner diameter and a constant outer diameter, pushing the pulp outward against a screen to discharge liquid;
• the one or more compression section separating the two or more transportation sections, thus removing fluids from the pulp between the two or more transportation sections;
• the two or more vessels joined to each other by flanged connections;
• the flanged connections each including an auger support collar, and the flanged connections each matching with one or more auger connections;
• each auger support collar surrounding one or more auger connections;
• the auger support collar formed from an upper support half and a lower support half;
• whereby the multi-stage horizontal digester is separatably at the flanged connections of the two or more vessels, and the one or more auger connections of the multi-stage auger, allowing for reconfiguration and re-ordering of the sections.