Aerobic denitrifying bacteria mainly exist in the genus Pseudomonas, Alcaligenes, Paracoccus and Bacillus. They are a type of Heterotrophic nitrifying bacteria that are aerobic or facultatively aerobic and use organic carbon as energy. Pseudomonas Pseudomonas aeruginosa Oil-contaminated soil Groundwater Marine Pseudomonas wastewater Pseudomonas stutzeri TR2 Activated sludge Pseudomonas stutzeri SU2 Pig pen wastewater treatment system Pseudomonas carboxydohydrogena Sewage Pond Pseudomonas chloritidismutans Acclimated sludge Pseudomonas sPP. Sulfur removal and denitrification treatment system Pseudomonas sP. strain K50 Activated sludge Pseudomonas sP. strain O-3 Soil Alcaligenes Alcaligenes faecalis Sulfur removal and denitrification treatment system Fecal production AlcaligenesfaecalisNo.4 Sewage sludge Alcaligenes Piechaudii Rice field sediment Alcaligenes sP. STC1 Wastewater treatment plant leachate Paracoccus denitrificans Paracoccus denitrificans (Pantotrophin) Sulfur removal and denitrification treatment system Thiobacillus soil Paracoccus sP. KS2 Wastewater Bacillus cereus fecal treatment system Bacillus licheniformis Bacillus subtilis Bacillus W2 Fish pond water sample Citrobacter diversus Hyphcmicrobium sP. Mesorhizobium Sp. strain NH-14 All soil red balls belong to Rhodococcus sP. HN Thiobacillus sP. THI051 Wastewater Zoogloea strain TL1 Activated sludge Other bacteria Comaminas testosteroni Upflow denitrification Filter Enterobacteraerogenes Wastewater Magnetospirillum magnetotacticum Pond water Microvirgula aerodenitrificans gen. nov.sp.nov. Activated sludge Nitrosomonaseuropaea Sewer sludge Ochrobatrum anthropi Rice field sediment Psychrobacterimmobilis Rhodospirillum salinarum Soil Sphingomonasadhaesiva Ditch Thaueramechernichensis Landfill leachate treatment System