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Anaerobic Digestion (water) : Wastewater solids and water (about 5% solids, 95% water) are placed in a large tank where bacteria decompose the solids in the absence of dissolved oxygen. At least two general groups of bacteria act in balance: (1) SAPROPHYTIC bacteria break down complex solids to volatile acids, the most common of which are acetic and propionic acids; and (2) METHANE FERMENTERS break down the acids to methane, carbon dioxide, and water.
Anoxic Denitrification (water) : A biological nitrogen removal process in which nitrate nitrogen is converted by microorganisms to nitrogen gas in the absence of dissolved oxygen.
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