Anoxic & Anerobic
Denitrification mixers are used in the suspension growth denitrification processes. Facultative bacteria uses organic carbon in the waste as both a carbon and energy source. Nitrate is used as an electron acceptor in energy metabolism. Through bacterial action, bacteria first reduces nitrate to nitrite and then to nitrogen, which is released as a gas. The denitrification reactor is generally covered to minimize oxygen absorption from the atmosphere. Proper venting is necessary to release generated gases.
Anaerobic digester mixers are used to stabilize sludges, through the decomposition of organic and inorganic matter in the absence of oxygen. The sludge is converted biologically, producing a variety of end products including methane and carbon dioxide. Most of the waste is converted to methane gas, which is combustible, therefore a useful end product.