Wastewater treatment systems, namely, plastic water purification units providing high surface area to volume ratio for the purpose of high-density biofilm growth, operating in wastewater treatment tanks

'area':12 'biofilm':23 'densiti':22 'growth':24 'high':10,21 'high-dens':20 'name':4 'oper':25 'plastic':5 'provid':9 'purif':7 'purpos':18 'ratio':15 'surfac':11 'system':3 'tank':29 'treatment':2,28 'unit':8 'volum':14 'wastewat':1,27 'water':6

Wastewater treatment systems in the nature of biofilm carriers comprised of high-density polyethylene cylinders that circulate freely in activated sludge for bod reduction, nitrification, denitrification, or total nitrogen removal, used in a wastewater treatment system

'activ':21 'biofilm':8 'bod':24 'carrier':9 'circul':18 'compris':10 'cylind':16 'denitrif':27 'densiti':14 'freeli':19 'high':13 'high-dens':12 'natur':6 'nitrif':26 'nitrogen':30 'polyethylen':15 'reduct':25 'remov':31 'sludg':22 'system':3,37 'total':29 'treatment':2,36 'use':32 'wastewat':1,35

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