Complete Mix Organic Waste Digester A complete mix organic digester is also known as a completely stirred tank reactor or CSTR. Manure moves through the system in a continuous flow. As new waste enters the tank, old waste is removed. Biogas production proceeds without any interruption from the loading and unloading of the waste material. The complete mix digester relies on anaerobic digestion to produce the methane gas from manure and organic waste. Anaerobic bacteria break down or digest organic material in the absence of oxygen and produce biogas as a waste product. To optimize the digestion process of the anaerobic bacteria, the digester should be kept at a constant temperature. Typically, a portion of the biogas generated is used to heat the contents of the digester, or the coolant from a biogas-powered generator is returned to a heat exchanger inside the digester tank. The material drawn from the digester is called sludge, or effluent. It is rich in nutrients (ammonia, phosphorus, and potassium) and is an excellent soil conditioner that can be returned to the field and used as a fertilizer. In addition to the production of biogas, anaerobic digestion provides nutrient recycling, waste treatment, and odor control. PRINT-FRIENDLY SPEC SHEET WORKSHEET FOR DETERMINING BIOGAS GENERATION PER VOLUME OF MANURE Home  |  Company Profile  |  Products  |  Software  |  Incentives  |  Partners  |  Contact Us   Copyright © 2008 Advanced Green Energy Solutions LLC. All rights reserved.