Improvement in ammonium removal efficiency in wastewater treatment by mixed culture of Alcaligenes faecalis no. 4 and L1

Characterization of a marine origin aerobic nitrifying–denitrifying bacterium

“…The TN removal rate in the aerobic denitrifying assay mentioned above suggested the possible occurrence of NO À 3 eN or NO À 2 eN conversion to gaseous nitrogen by strain F6, which has been demonstrated in some species of bacteria, such as Alcaligenes faecalis (12,13). To verify this speculation, GCeMS and GCeIRMS analyses were conducted to identify the production of N 2 O and N 2 , respectively, by strain F6.…”

Removal of nitrate using Paracoccus sp. YF1 immobilized on bamboo carbon

“…The bamboo carbon carrier, furthermore, provided enough space for cell growth to generate high cell density [13]. Since its porosity forms the oxic and anoxic zones, anaerobic denitrification also occurred in this instance [17]; both aerobic and anaerobic denitrification therefore accelerated the nitrate removal efficiency. In contrast, bamboo carbon did not remove nitrate since the adsorption of nitrate onto the bamboo was not observed.…”

Heterotrophic nitrification–aerobic denitrification by novel isolated bacteria

“…However, this type of system is difficult to operate due to the low rate of nitrification and the complexity of separating nitrification and denitrification reactors. Recently, bacteria capable of combined heterotrophic nitrification and aerobic denitrification has been investigated as potential microorganisms in biological nitrogen removal systems [2,4,9]. These microorganisms, due to their high growth rate and ability to convert ammonium (NH 4 ? ) to N 2 aerobically, have many advantages as applied for the removal of nitrogen: (1) procedural simplicity, where nitrification and denitrification can take place simultaneously; (2) less acclimation problems; (3) lesser buffer quantity needed because alkalinity generated during denitrification can partly compensate for the alkalinity consumption in nitrification [3].…”