Onsite wastewater treatment system of 50,000 gal/day or less for removal of all nitrogen species present in wastewater comprised of a vessel made of any material suitable for containing microorganisms, for example, concrete, fiberglass-reinforced polymer, or polyethylene, and a medium for growing microorganisms made of any substance or material that is suitable for growing microorganisms, whether attached or suspended, for example, sand, rock, air, water, peat, wood chips, or manufactured media

'000':7 '50':6 'air':67 'attach':60 'chip':71 'compris':20 'concret':34 'contain':30 'exampl':33,64 'fiberglass':36 'fiberglass-reinforc':35 'gal/day':8 'grow':45,57 'less':10 'made':24,47 'manufactur':73 'materi':27,52 'media':74 'medium':43 'microorgan':31,46,58 'nitrogen':15 'onsit':1 'peat':69 'polyethylen':40 'polym':38 'present':17 'reinforc':37 'remov':12 'rock':66 'sand':65 'speci':16 'substanc':50 'suitabl':28,55 'suspend':62 'system':4 'treatment':3 'vessel':23 'wastewat':2,19 'water':68 'whether':59 'wood':70

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