AP-1 Wastewater Anaerobic Digestion (Mesophilic) ©PSX2010 AP-1 20101210 Application: Anaerobic Digestion – Sludge Heating (Mesophilic) There are two general types of digestion processes known as aerobic and anaerobic digestion. Aerobic uses oxygen and anaerobic is an oxygen free environment. Anaerobic digestion is a biological process that breaks down for organic solids. In this process wastewater sludge is stored in large vessels, referred to as digesters that range from 0.5 – 3.0 million gallons of storage capacity. One of the other key differences in anaerobic digestion is that heat is added to stimulate the biological activity which accelerates the process. In the mesophilic stage, temperatures are typically maintained around 96 °f. Historical

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