“…In spite of the classical belief that this process is predominated by autotrophic bacteria, certain bacterial species like the Bacillus sp. 11,19 also is considered for nitrogen removal. Certain species of the Bacillus group, especially one members of this group, such as B. substilis 19,21,22 , are able to grow under facultative aerobic, aerobic, and anaerobic conditions, allowing for shifts in nitrogen uptake that facilitate both nitrification and denitrification.…”