biological reactors for use in water treatment plants; microfiltration and ultrafiltration membranes, components of water filtration units in the nature of engineered skids with piping and pumps, and biological reactors with membrane filtration skids, all for waste water treatments, the biological purifying and the recycling of water

'biolog':1,29,41 'compon':13 'engin':22 'filtrat':16,33 'membran':12,32 'microfiltr':9 'natur':20 'pipe':25 'plant':8 'pump':27 'purifi':42 'reactor':2,30 'recycl':45 'skid':23,34 'treatment':7,39 'ultrafiltr':11 'unit':17 'use':4 'wast':37 'water':6,15,38,47

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